CN116132539B - Service anti-destruction interoperation method and device for narrowband weak connection - Google Patents
Service anti-destruction interoperation method and device for narrowband weak connection Download PDFInfo
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Abstract
The invention provides a service anti-destruction interoperation method and device for narrowband weak connection, and belongs to the field of information service. The method realizes service discovery, addressing and interoperation in a narrowband wireless communication network environment with high dynamic, weak connection and strong interference, and ensures service destruction-resistant succession and high reliable interoperation capability in the narrowband wireless environment. The method provides a publishing/subscribing mode to solve the service addressing and calling technology of a registration center based on the difficult problem found by service centralization in a centerless environment, constructs a method and implementation of on-demand start guarantee of silent service, and solves the contradiction between service destruction resistance and resource optimization guarantee in a narrowband wireless environment.
Description
Technical Field
The invention belongs to the field of information service, and particularly relates to a service destruction-resistant interoperation method and device for narrowband weak connection.
Background
In a wireless narrowband environment, particularly in a network environment with high mobility and weak connection, nodes enter the network at any time and exit the network at any time, the wireless networking structure is changed frequently, the service registration center and the bearing node of a certain designated service are difficult to ensure to be continuously in the wireless networking, the IP inside the networking is not fixed, the traditional centralized service addressing and calling mode is difficult to meet the requirements of the narrowband environment, and the difficulty is increased for calling the service on demand under the narrowband weak connection condition. Therefore, two sets of physical communication mechanisms of IP and non-IP are required to be compatible, and a subscription/release service addressing and state updating mode is constructed in the dynamic networking, so that service addressing, calling and anti-destruction succession under a narrow-band weak connection environment are realized based on a multi-instance service bearing mode.
Disclosure of Invention
Aiming at the technical problems, the invention provides a service destruction resistant interoperation scheme for narrowband weak connection. The scheme is mainly applied to a narrow-band network environment, establishes a link between a service client and a service terminal under a registration-free architecture, realizes service addressing, state updating, on-demand starting and cross-node calling based on two sets of physical communication mechanisms of IP and non-IP, provides the service destruction resistance for the narrow-band weak connection environment by depending on a multi-instance service bearing mode, and finally aims at solving the problem of high-reliability access and calling of the narrow-band weak connection service.
The first aspect of the invention discloses a service anti-destruction interoperation method for narrowband weak connection. The method completes service addressing and service calling under the condition of not configuring a registry; comprising the following steps: step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req; step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name; step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS networking in a subscription receiving mode, and judges whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >; when the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period; step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period; wherein, according to the formulaAnd calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
According to the method of the first aspect of the present invention, in the method, the presence status of the respective service instances is periodically detected; the method specifically comprises the following steps: after the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a); after addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received; after detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
According to the method of the first aspect of the invention, in the method: all service nodes are started or online, the data distribution service DDS networking subscription service is applied to start, and the subscription main Topic is Topic-service_start; when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A: the service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name; the other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node; when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A; when the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
According to the method of the first aspect of the invention, in the method: the method comprises the steps that a client and a server of a service respectively generate a corresponding client calling interface and a corresponding server service interface according to a service description IDL file, wherein IDL is a service interface definition language; the clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message; after receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service; and the client of the service generates returned object data by deserializing the received service message through the client calling interface.
The second aspect of the invention discloses a service destruct interoperation device facing to narrow-band weak connection, which completes service addressing and service calling under the condition of not configuring a registry; the apparatus is configured on a server and a client to perform the steps of: step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req; step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name; step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS network in a subscription receiving mode,
Judging whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >; when the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period; step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period; wherein, according to the formulaAnd calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
According to the device of the second aspect of the present invention, the online status of each service instance is periodically detected; the method specifically comprises the following steps: after the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a); after addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received; after detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
According to the device of the second aspect of the invention, after all service nodes are started or online, subscription service application of the DDS network is started, and the subscription subject is Topic-service_start; when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A: the service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name; the other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node; when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A; when the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
According to the device of the second aspect of the invention, the client and the server of the service respectively generate a corresponding client calling interface and a corresponding server service interface according to the service description IDL file, wherein IDL is a service interface definition language; the clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message; after receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service; and the client of the service generates returned object data by deserializing the received service message through the client calling interface.
A third aspect of the invention discloses an electronic device. The electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the service anti-destruction interoperation method facing the narrow-band weak connection in the first aspect of the disclosure when executing the computer program.
A fourth aspect of the invention discloses a computer-readable storage medium. The computer readable storage medium stores a computer program, which when executed by a processor, implements a service survivability interoperation method for narrowband weak connection according to the first aspect of the disclosure.
In summary, the technical scheme provided by the invention abandons the addressing mode of service address request and feedback under a registry architecture, in a wireless narrowband network, a DDS bus is used as a communication bearer, two pairs of dual subscription-release models are constructed between a client and a server to obtain an available service address, the client optimizes service addressing results, and the service request and the return mode of IP physique are selected to realize service call after addressing. And finally, the problems of service destruction resistance and resource optimal application in a narrow-band environment are solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a usage pattern of system narrowband service survivor succession according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a software architecture and functional components according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a service addressing discovery mechanism according to an embodiment of the invention;
FIG. 4 is a schematic diagram of a status reporting mechanism according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating information interoperability between a client and a server according to an embodiment of the present invention;
fig. 6 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Abbreviations and key term definitions include:
DDS: the data distribution service DDS (Data Distribution Service) is a distributed real-time communication middleware technical specification formulated by an object management organization OMG, and the specification defines a data-centric publish/subscribe model, so that real-time, efficient and flexible distribution of data can be ensured.
IDL file: IDL (Interface Definition Language) is the service interface definition language, which is the basis for cross-platform development. IDLs provide a set of generic data types and define more complex data types with these data types. The programmer can compile the file through IDL interface expression to generate a corresponding serialization interface program.
Service addressing optimization model: a multi-node, multi-instance model of service addressing evaluation is provided that can help select an optimal server when multiple nodes, multiple service publishers, are available.
Silence service: the service image file is stored on the service node, and when the service node is initialized, the service defaults to not start operation. The service is started when a start command sent by a service client (consumer) within the network is received.
The invention provides a service anti-destruction interoperation method and device for narrowband weak connection from the practical demand and application point of view, and the service anti-destruction succession mode of the system narrowband service in the invention is shown in figure 1.
(1) The invention aims at centerless networking in a wireless environment, and the service is cooperatively and peer-to-peer invoked between nodes, and each service node is both a producer (service end service instance) and a consumer (service client) of the service. Unlike the traditional SOA service architecture, the service access calling process in the invention does not depend on a registry.
(2) The invention aims to solve the problem of service destruction resistance in a narrowband wireless environment. The same service is redundantly deployed in different service nodes in a multi-instance mode, so that when one service node fails or moves out of the network, homogeneous services on other nodes can be quickly replaced, and uninterrupted guarantee is provided for other node applications in the network.
(3) The invention aims to solve the contradiction between service destruction resistance and resource optimization guarantee in a narrowband environment. Services on the service nodes exist and are deployed in a manner of a docker container mirror. The service node is initialized, and defaults that certain services start to run and certain services do not start. When a service is required to be provided by an application in the wireless networking, and the service is not operated on all service nodes in the networking, a service node (a container mirror image of the service exists on the node) is selected, and the service is started quickly.
Further, the invention provides a software architecture and functional composition of a service anti-destruction interoperation method and device for narrowband weak connection, and a software system composition architecture diagram of the invention is shown as 2.
The software system is divided into three modules: service invocation, service addressing, and service status. The service addressing includes a client Sub (subscribing and receiving a return result of the service addressing), a client Publish (publishing a request for the service addressing), a server Sub (subscribing to the service addressing), a server Publish (publishing a result of the service addressing), and a DDS data bus. The service status includes service status reporting, service status receiving, service status detecting, service reconnection and service list updating. Service calls include service calls, interface serialization, service codec, load balancing, transport optimization, and protocol conversion.
The first aspect of the invention discloses a service anti-destruction interoperation method for narrowband weak connection. The method completes service addressing and service calling under the condition of not configuring a registry; comprising the following steps: step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req; step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name; step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS networking in a subscription receiving mode, and judges whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >; when the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period; step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period; wherein, according to the formulaAnd calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
In a preferred embodiment, in the method, the presence status of the respective service instance is periodically detected; the method specifically comprises the following steps: after the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a); after addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received; after detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
In a preferred embodiment, in the method: all service nodes are started or online, the data distribution service DDS networking subscription service is applied to start, and the subscription main Topic is Topic-service_start; when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A: the service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name; the other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node; when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A; when the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
In a preferred embodiment, in the method: the method comprises the steps that a client and a server of a service respectively generate a corresponding client calling interface and a corresponding server service interface according to a service description IDL file, wherein IDL is a service interface definition language; the clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message; after receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service; and the client of the service generates returned object data by deserializing the received service message through the client calling interface.
In particular, the invention aims to solve the problems of service addressing and service calling in a wireless network without a registry architecture, and provides a pair of subscription-release service addressing discovery mechanisms at a service client and a service end. As shown in fig. 3, the specific implementation steps are as follows.
Step 1: the service A is initialized and started, the DDS networking is subscribed to the service A addressing request (the addressing request is issued to the DDS networking at the time of addressing of the subsequent client), and the subscription main problem is Topic-req;
Step 2: the client initiates service addressing, firstly subscribes service A addressing response to the DDS networking (the response is that the subsequent service end outputs addressing information moment and issues addressing output results to the DDS networking), and the subscription theme is Topic-rsp;
Step 3: the client issues service addressing request information to the DDS, the issued theme is Topic-req, and the structure of the issued data is described as follows: < SERVICENAME >, wherein SERVICENAME is a service name;
step 4: the service end of the service A receives addressing request data < SERVICENAME > of the client end from the DDS in a subscription receiving mode;
Step 5: the service end of the service A identifies whether the local service has the service of < SERVICENAME >, if yes, the step 6 is executed;
step 6: the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, wherein Addr is the service end access address of the service A, count is the number of times the recent service is called, percentage is the success rate of the service is called, service address information is issued to the DDS, and the issued theme is Topic-rsp;
Step 7: the client receives addressing response data < SERVICENAME, addr > of the server from the DDS in a subscription receiving mode;
step 8: the client receives addressing information of a plurality of service terminals about the service A, and locally carries out addressing optimization to select 1 service instance.
Specifically, the invention also provides a service addressing preferred method in the wireless networking, the most reliable service release node in the networking is calculated according to the number of times count and the success rate percentage of calling of the service between the nodes, and the node address is used as a service addressing result. The specific algorithm comprises the following steps: step 1: service efficiency is evaluated according to an algorithm, and an evaluation formula is as followsS is a service instance efficiency evaluation value; step 2: and (3) aiming at the service A, carrying out efficiency evaluation sequencing on all service instances of the service A, and selecting the service instance with the maximum efficiency value.
Specifically, the invention provides a complete set of state reporting mechanism aiming at the service instance of the service end, so that the service client can know whether the service instance is online as early as possible, and the service client can address list data according to the service. As shown in fig. 4, the specific implementation steps are as follows.
Step 1: after the service end A1 of the service A is initialized and started, the state information of the service A is periodically issued to the DDS networking, and the issue is Topic-status (a);
Step 2: after the client initiates addressing to the service A (executes a series of steps in the summary 1), subscribing the state information of the service A to the DDS networking, wherein the subscription subject is Topic-status (a);
Step 3: the client periodically receives the status data sent by the Topic Topic-status (a);
Step 4: the client service state discrimination thread filters out the state that service A is not received in 3 service addressing periods, and then the service A reconnection is actively carried out. If reconnection fails, executing the step 4.1, otherwise executing the step 4;
step 4.1: clearing the service A of the service end A1 from the service addressing list, and jumping to the step 4;
Specifically, in order to solve the contradiction between service destruction resistance and resource optimization guarantee in a narrowband wireless environment, the invention provides a service 'selection-start' method on a service node aiming at the un-started service, which constructs a pair of subscription-release based on a DDS data bus to realize the information interoperation between a service client and a service end. As shown in fig. 1, the specific implementation steps are as follows.
Step 1: all service nodes are started or online, the DDS networking subscription service is applied for starting, and the subscription main title is Topic-service_start;
Step 2: the node S addresses and discovers that all nodes in the networking do not start the A service, the node S subscribes address data response of the A service to the DDS networking, and the subscription theme is Topic-service_start-A;
Step 3: issuing a service start application to the DDS networking, wherein the issue main title is Topic-service_start, and the issue data is < SERVICENAME >, wherein SERVICENAME is the name (unique identifier) of the service A;
step 4: the node in the networking receives the data < SERVICENAME > of the Topic Topic-service_start;
step 5: the node in the networking locally identifies whether the dock container mirror image of the service A is stored in a local disk, and if so, the step 6 is executed;
step 6: the service node issues a search result of the service A to the DDS networking, issue a main problem of Topic-service_start-A, issue data of < Addr, status >, wherein Addr is a service node address, status is a result state of service search, status is 1, which indicates that the node has a service A container mirror image, and status is 0, which indicates that the node has no service A container mirror image; if status is 1, continuing to execute step 6.1, otherwise executing step 7;
step 6.1: the service node subscribes an A service starting instruction of the S node to the DDS networking, and the subscription theme is Topic-service_start-cmd-A;
Step 7: the node S receives data sent by each node in the networking based on the Topic Topic-service_start-A, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of List < Addr >, and the List < Addr > represents a service node address array to be started;
step 8: the node S issues a service starting instruction to the DDS networking, the issue theme is Topic-service_start-cmd-A, and the issue data is List < Addr > of the step 7;
Step 9: and a node subscribing to the Topic-service_start-cmd-A in the networking receives the List < Addr > data, judges whether the address of the node exists in the address array, and starts the container mirror image of the service A if the address exists.
Specifically, the method and the device for calling between the service client and the service end in the invention comprise the following specific steps.
Step 1: the service client and the service end generate corresponding client calling interfaces and service end service interfaces according to the service description IDL file;
step 2: the service client side completes service addressing according to the steps in the invention content 3;
step 3: the service client generates a serialized service message through a calling interface;
step 4: the service client sends a service message according to the optimized service address in the step 8;
Step 5: the service end receives the service message and deserializes the service message into object data of the service request through a service interface of the service end;
step 6: the service process processing is carried out in the service server to generate a returned result object;
step 7: serializing the returned object data into a service message through a service interface of the server;
step 8: the service server sends the return message to the client;
step 9: the service client deserializes the returned message into returned object data through the client interface.
The second aspect of the invention discloses a service destruct interoperation device facing to narrow-band weak connection, which completes service addressing and service calling under the condition of not configuring a registry; the apparatus is configured on a server and a client to perform the steps of: step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req; step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name; step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS network in a subscription receiving mode,
Judging whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >; when the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period; step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period; wherein, according to the formulaAnd calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
According to the device of the second aspect of the present invention, the online status of each service instance is periodically detected; the method specifically comprises the following steps: after the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a); after addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received; after detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
According to the device of the second aspect of the invention, after all service nodes are started or online, subscription service application of the DDS network is started, and the subscription subject is Topic-service_start; when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A: the service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name; the other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node; when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A; when the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
According to the device of the second aspect of the invention, the client and the server of the service respectively generate a corresponding client calling interface and a corresponding server service interface according to the service description IDL file, wherein IDL is a service interface definition language; the clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message; after receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service; and the client of the service generates returned object data by deserializing the received service message through the client calling interface.
A third aspect of the invention discloses an electronic device. The electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the service anti-destruction interoperation method facing the narrow-band weak connection in the first aspect of the disclosure when executing the computer program.
Fig. 6 is a block diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 6, the electronic device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic device includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the electronic device is used for conducting wired or wireless communication with an external terminal, and the wireless communication can be achieved through WIFI, an operator network, near Field Communication (NFC) or other technologies. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the electronic equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 6 is merely a block diagram of a portion related to the technical solution of the present disclosure, and does not constitute a limitation of the electronic device to which the technical solution of the present disclosure is applied, and a specific electronic device may include more or less components than those shown in the drawings, or may combine some components, or have different component arrangements.
A fourth aspect of the invention discloses a computer-readable storage medium. The computer readable storage medium stores a computer program, which when executed by a processor, implements a service survivability interoperation method for narrowband weak connection according to the first aspect of the disclosure.
In summary, the technical scheme provided by the invention abandons the addressing mode of service address request and feedback under a registry architecture, in a wireless narrowband network, a DDS bus is used as a communication bearer, two pairs of dual subscription-release models are constructed between a client and a server to obtain an available service address, the client optimizes service addressing results, and the service request and the return mode of IP physique are selected to realize service call after addressing. And finally, the problems of service destruction resistance and resource optimal application in a narrow-band environment are solved.
Note that the technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be regarded as the scope of the description. The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A service anti-destruction interoperation method facing narrowband weak connection is characterized in that the method completes service addressing and service calling under the condition of not configuring a registry; comprising the following steps:
Step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req;
Step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name;
Step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS networking in a subscription receiving mode, and judges whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >;
When the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period;
Step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period;
Wherein, according to the formula And calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
2. A method of service survivability interoperation towards a narrowband weak connection as claimed in claim 1, wherein in said method, the online status of each service instance is periodically detected; the method specifically comprises the following steps:
After the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a);
After addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received;
After detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
3. A method of service survivability interoperation towards narrowband weak connections as claimed in claim 2, wherein in the method:
All service nodes are started or online, the data distribution service DDS networking subscription service is applied to start, and the subscription main Topic is Topic-service_start;
when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A:
The service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name;
The other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node;
when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A;
When the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
4. A method of service survivability interoperation for narrowband weak connections as claimed in claim 3, wherein in the method:
The method comprises the steps that a client and a server of a service respectively generate a corresponding client calling interface and a corresponding server service interface according to a service description IDL file, wherein IDL is a service interface definition language;
The clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message;
After receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service;
And the client of the service generates returned object data by deserializing the received service message through the client calling interface.
5. A service anti-destruction interoperation device facing narrowband weak connection completes service addressing and service calling under the condition of not configuring a registry; wherein the apparatus is configured on a server and a client to perform the steps of:
Step S1, a service end of a service A is initialized and started, a data distribution service DDS networking subscription service A addresses a request, and a subscription theme is Topic-req;
Step S2, a client initiates service addressing, and subscribes service A addressing response to the data distribution service DDS networking, wherein the subscription subject is Topic-rsp; further, the client issues service addressing request data to the data distribution service DDS networking, the issue subject is Topic-req, and the data structure description of the issue data is < SERVICENAME >, wherein SERVICENAME is a service name;
Step S3, the service end of the service A receives the addressing request data < SERVICENAME > of the client end from the data distribution service DDS network in a subscription receiving mode,
Judging whether the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >;
When the service end of the service A contains the service corresponding to the addressing request data < SERVICENAME >, the service end of the service A encapsulates the address information of the service A, the data structure is < SERVICENAME, addr, count and percentage >, the encapsulated address information of the service A is issued to the data distribution service DDS networking, the issue Topic is Topic-rsp, wherein Addr is the service end access address of the service A, count is the number of times the service A is called in a fixed time period, and percentage is the success rate of the service A being called in the fixed time period;
Step S4, the client receives addressing response data < SERVICENAME, addr > of the service end from the data distribution service DDS network in a subscription receiving mode, further receives addressing information of a plurality of service instances about the service A, and selects one service instance to call the service A based on the number count of times the service A is called in the fixed time period and the success rate percentage of the service A is called in the fixed time period;
Wherein, according to the formula And calculating the service efficiency evaluation value of each service instance about the service A, and selecting the service instance with the maximum service efficiency evaluation value to call the service A.
6. The service survivability interoperation device for narrowband weak connections as claimed in claim 5, wherein the online status of each service instance is periodically detected; the method specifically comprises the following steps:
After the service end of the service A is started through the initialization, the state information of the service A is periodically issued to the data distribution service DDS networking, and the issue is entitled to Topic-status (a);
After addressing of the service A in the steps S1-S4 is initiated, the client subscribes the state information of the service A to the data distribution service DDS network, and subscribes to the Topic of Topic-status (a), so that the state information of the service A sent by the Topic of Topic-status (a) is periodically received;
After detecting that the service state authentication thread of the client does not receive the state information of the service A in a plurality of continuous service addressing periods, actively initiating a reconnection process of the service A; and if reconnection fails, clearing the service A of the service end from a service addressing list.
7. The service survivable interoperation device for narrowband weak connections as claimed in claim 6, wherein:
After all service nodes are started or online, a subscription service application of the DDS networking is started, and the subscription subject is Topic-service_start;
when the service node S addresses and discovers that all nodes in the data distribution service DDS networking do not start the service A:
The service node S subscribes the address data response of the service A to the data distribution service DDS networking, and the subscription theme is Topic-service_start-A; issuing a service start application to the data distribution service DDS networking, wherein the issue main title is Topic-service_start, and the data structure description of the issued data is < SERVICENAME >, wherein SERVICENAME is a service name;
The other service nodes in the data distribution service DDS networking receive release data < SERVICENAME > with release subject of Topic-service_start, and locally identify whether a container mirror image of the service A is stored in a local disk, if yes, the search result of the service A is released to the data distribution service DDS networking, the release subject of Topic-service_start-A is released, the release data is < Addr, status >, wherein Addr is a service end access address of the service A, status is a search result state of the service A, status value is 1, which indicates that the container mirror image of the service A exists in the current service node, and status value is 0, which indicates that the container mirror image of the service A does not exist in the current service node;
when the value of status is 1, the current service node subscribes a starting instruction of the service A of the service node S to the data distribution service DDS network, and the subscription theme is Topic-service_start-cmd-A;
When the status value is 0, the service node S receives data sent by other service nodes in the DDS network based on the Topic-service_start-a, analyzes the data, selects a service instance to be started, encapsulates the service instance into a plurality of lists < Addr >, and the lists < Addr > represent an address array of the service instance to be started; the service node issues a starting instruction of the service A to the data distribution service DDS networking, the issue subject is Topic-service_start-cmd-A, and the issue data is List < Addr >; after receiving data List < Addr >, the service subscribed to Topic-service_start-cmd-A in the DDS networking judges whether the address array of the service has the current service node address, and if so, the container mirror image of the service A is started.
8. The service survivable interoperation device for narrowband weak connections as claimed in claim 7, wherein:
The method comprises the steps that a client and a server of a service respectively generate a corresponding client calling interface and a corresponding server service interface according to a service description IDL file, wherein IDL is a service interface definition language;
The clients of the service are configured to: S1-S4, service addressing is completed, a serialized service message is generated through the client calling interface, and further, an optimized service instance is selected through address optimization to call the service and send the service message;
After receiving the service message, the service end of the service generates object data of a service request through the service interface of the service end by deserialization; generating a return result object through internal service process processing; the service interface of the service end sequences the returned result object data into a service message and sends the service message to the client of the service;
And the client of the service generates returned object data by deserializing the received service message through the client calling interface.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, the processor implementing a narrowband weak link oriented service tamper resistant interoperation method as claimed in any of claims 1-4 when the computer program is executed.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the method for service destruction resistant interoperation towards narrowband weak links according to any of claims 1-4 is implemented.
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