CN112153686B - Service self-networking method based on service discovery data synchronization - Google Patents
Service self-networking method based on service discovery data synchronization Download PDFInfo
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Abstract
The invention provides a service ad hoc network method based on service discovery data synchronization, which extracts service description information required by service networking discovery into service discovery data, combines the service discovery data with wireless communication network networking data, synchronizes between nodes when network networking is carried out between the nodes, and after the wireless network completes ad hoc network, the nodes can discover services provided by each node in the network according to the synchronized service discovery data, thereby realizing service discovery and calling and realizing the ad hoc network of a service layer. Based on the method, the low-consumption and high-reliability synchronization of the service information among the multiple nodes in the wireless network can be realized, the rapid discovery of the service among the multiple nodes can be realized, the problems of complex synchronization steps, more invalid data and the like in the traditional service directory synchronization mode can be avoided, and the method is more suitable for the low-bandwidth communication scene of the wireless network.
Description
Technical Field
The invention relates to the field of data information systems, in particular to a service ad hoc network method based on service discovery data synchronization.
Background
In an SOA (Service-Oriented Architecture) Oriented system, various different functional units are split to form services with specific functions, and the services are linked through interfaces and protocols to form the system. At present, discovery between services is generally achieved in a service directory manner, description information of various services is registered on a service directory, and a certain service may discover other services in a system through the service directory and be invoked through the service description information.
Under the condition of multiple nodes of a wireless network, if a certain node of the wireless network accesses other nodes in a service directory mode, the problems of more resource occupation, long access time consumption, high error probability and the like are caused.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art and provides a service ad hoc network method based on service discovery data synchronization.
In order to solve the technical problem, the invention discloses a service ad hoc network method based on service discovery data synchronization.
Under the condition of a wireless local area network, wireless connection is established between nodes on a physical layer, node discovery is realized on a link layer, route discovery and service discovery are carried out on a network layer, service discovery data of the nodes are combined with networking data of a wireless communication network, the nodes are synchronized when networking is carried out between the nodes, and a wireless network completes service ad hoc networking; the service discovery data is service description carried on the node, is extracted from service description information of an application layer service directory, comprises a service name, a service address and service function description information, and can be added with extended attributes according to needs; the service discovery data is stored in a code mode, and original information is restored through a dictionary mapping table. The nodes can discover the services provided by each node in the network according to the synchronized service discovery data and realize the calling of the required services; the service is a service provided by the node running software.
After the service is networked, if the service state of a certain node changes, the changed service discovery data is sent to other nodes through broadcasting, and after the other nodes finish modification, the modification state is fed back through a heartbeat mechanism, so that the service discovery data of the modified nodes are synchronously updated.
After the services are networked, a certain node is disconnected from other node networks due to faults, and other nodes automatically disable service discovery data related to the fault node; if the network disconnection time of the fault node is within the set time value T, after the fault node is on-line again, other nodes restore the original service discovery data of the fault node without resynchronization; and if the network disconnection time of the fault node exceeds a set value T, the fault node exits the service networking, and the service discovery data synchronization needs to be carried out again when the fault node is on line again.
In the method, the data for discovering the initial synchronization service of the newly added node comprises the following steps:
step 1-1, extracting service discovery data from the service description information of the node of an application layer service directory by a newly added node;
step 1-2, the newly added node and the existing node in the network establish physical connection through a wireless channel in a physical layer;
step 1-3, the newly added node realizes network discovery with the existing node in the network through the function of a wireless network link layer;
step 1-4, the newly added node and the existing node in the network carry out route discovery in the network layer, and send the service discovery data of the node to the existing node in the network, thereby realizing the service discovery data synchronization between the nodes; the service discovery data synchronization is realized by combining service discovery data in the newly added node with wireless communication network data and synchronizing the newly added node with the wireless communication network data to the existing node in the network when the newly added node and the existing node in the network are wirelessly networked; when an existing node in a network discovers a newly added node through the network, service discovery data operated by the newly added node is obtained, and meanwhile, self service discovery data is sent to the newly added node;
step 1-5, adding service discovery data of the newly added node locally by the existing node in the network, and adding the service discovery data of the existing node in the network locally by the newly added node;
and 1-6, all nodes in the network realize service discovery and calling through the service discovery data of other local nodes, and the service ad hoc network is completed.
In the process, the efficient synchronization of the service description information among the multiple nodes can be realized under the condition of a wireless network characterized by low bandwidth, high jitter and high time delay, so that the service ad hoc network among the nodes is realized, and the discovery and the calling of the service among the nodes can be supported.
In the method of the present invention, modifying the node update service discovery data comprises the following steps:
step 2-1, when the service discovery data of the nodes in the network is not changed, broadcasting to other nodes in the local area network through heartbeat to realize state declaration;
step 2-2, when the service discovery data of a certain node in the network changes, the changed service discovery data is formed and broadcasted to other nodes in the local area network; after receiving the change notification, the other nodes complete the update of the service discovery data of the local modified node, and perform update declaration in the next heartbeat;
and 2-3, after the modification node receives the update declaration from other nodes in the network, ending the state update.
If the modified node does not receive the update of a certain node in the network, the modified node sends the change data to the node again and waits for the update declaration of the node; if the modification node still does not receive the declaration of the node, repeatedly sending the change data to the node, repeating more than three times of the declaration of the node still not received, indicating that the data updating from the modification node to the node fails, and indicating that the broadcast of the modification node fails; and if other nodes in the network also find the node to be abnormal, judging that the node has operation failure.
In the process, only the service discovery data of the node change is synchronously modified, so that the bandwidth consumption can be maximally reduced.
In the method, the steps of quitting the network and rejoining the network by the fault node comprise the following steps:
step 3-1, if a certain node in the network is disconnected from the wireless network due to operation failure, other nodes in the network find that the network connection with the failed node is lost, the service discovery data of the failed node is changed to be unavailable, and meanwhile, the service borne by the failed node is stopped to be called;
3-2, if the network disconnection time of the fault node is within the set time value T, the fault node is on line again and establishes connection with other nodes in the network, and the other nodes recover the original service discovery data of the fault node without synchronization again;
3-3, if the network disconnection time of the fault node exceeds a set time value T, the fault node is not on line, other nodes delete local service discovery data about the fault node, and the fault node is removed from the service ad hoc network; and when the fault node is on-line again, the step 1-1 to the step 1-6 need to be executed again to carry out service discovery data synchronization.
The process can quickly find the fault node and stop calling the service of the fault node, and the networking is more reliable.
Has the beneficial effects that: compared with the prior art, the invention has the following advantages:
1. data synchronization is more efficient than conventional approaches. The service discovery data is synchronized among the nodes of the wireless network through a networking mechanism of the wireless network, so that the message encapsulation in the traditional mode is avoided, and the synchronization efficiency is higher than that of the traditional mode;
2. service discovery is faster than conventional approaches. After the new node is accessed to the network, other nodes can realize service discovery through the service discovery data, and the service discovery is faster than that in the traditional mode;
3. service networking is more reliable than traditional approaches. After the service networking is carried out, when a certain node is disconnected with other nodes due to network and other reasons, other nodes acquire the network quitting state of the node based on a network mechanism, synchronously stop local service discovery data about the network quitting node, and stop calling related services.
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The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
FIG. 1 is a schematic diagram of a new node joining a WLAN service discovery data synchronization
FIG. 2 is a schematic diagram of a service discovery data update synchronization mechanism
FIG. 3 is a diagram of a hierarchy of conventional service directory synchronization mechanisms
FIG. 4 is a schematic diagram of service discovery based on service discovery data
Detailed Description
Fig. 3 shows a conventional service discovery method, in which two nodes establish physical connection through a wireless channel, implement node discovery based on a link layer, establish a routing relationship through a network layer, and then are initiated by an application layer, implement service discovery between nodes in a manner of synchronizing service directories, that is, steps of accessing a service directory, acquiring a node address where a service is located, acquiring a service at a node where a service is located, and the like need to be completed, and the whole process needs to be performed for multiple times of interaction. The method is limited by low-quality wireless network conditions, such as narrow bandwidth of wireless connection and unstable connection, which causes the problems that a certain node occupies more resources when accessing other nodes, the access consumes long time, the error probability is high, and the like.
Fig. 4 shows a service discovery data synchronization method according to the present invention. Under the condition of a wireless local area network, wireless connection is established between nodes on a physical layer, node discovery is realized on a link layer, route discovery and service discovery are carried out on a network layer, service discovery data of the nodes are combined with networking data of a wireless communication network, the nodes are synchronized when network networking is carried out between the nodes, and a wireless network completes service ad hoc network; the service discovery data is service description carried on the node, is extracted from service description information of an application layer service directory, comprises a service name, a service address and service function description information, and can be added with extended attributes according to needs; the service discovery data is stored in a code mode, and original information is restored through a dictionary mapping table. The nodes can discover the services provided by each node in the network according to the synchronized service discovery data and realize the calling of the required services; the service is a service provided by the node running software.
Fig. 1 is a schematic diagram illustrating synchronization of new nodes added to wireless lan service discovery data according to the present invention, where nodes a, B, C, and D have completed wireless-based networking, and node E is a newly added node.
Specifically, the newly added node primary synchronization service discovery data includes the following steps:
step 1-1, running related services on a node E, extracting service discovery data from service description information, wherein the service discovery data comprises a service name, a relative address, service description and the like, storing related information codes for saving bandwidth, and restoring original information through a dictionary mapping table;
step 1-2, the node E establishes wireless connection with other nodes in a physical layer through an appointed channel;
step 1-3, realizing network discovery of the node E and other nodes through the function of a wireless network link layer;
step 1-4, establishing a route of the node E in the nodes A-D through a network layer function of the wireless network, simultaneously sending service discovery data of the node E to the nodes A-D, and similarly, receiving the service discovery data of the nodes A-D by the node E;
step 1-5, the nodes A-D locally add service discovery data of the node E, and the node E locally adds the service discovery data of the nodes A-D;
and 1-6, each node realizes the discovery and the calling of the service through the local service discovery data, and completes the service ad hoc network.
After the service is networked, if the service state of a certain node changes, the changed service discovery data is sent to other nodes through broadcasting, and after the other nodes finish modification, the modification state is fed back through a heartbeat mechanism, so that the service discovery data of the modified nodes are synchronously updated.
FIG. 2 is a schematic diagram illustrating a service discovery data update synchronization mechanism, in which a node E has completed networking with nodes A-D.
Specifically, modifying the node update service discovery data comprises the steps of:
step 2-1, when the node E service finds that the data is not changed, the node E service broadcasts the data to other nodes in the local area network through heartbeat to realize state declaration;
step 2-2, the service discovery data of the node E is changed to form service discovery data change data which is broadcasted to other nodes of the local area network, after the other nodes receive the change notification, the service discovery data of the local node E is updated, and in the next heartbeat, the fact that the service discovery data of the node E is updated by the node E is declared;
step 2-3, after the node E receives the update declaration from the nodes A-D, the state update is finished;
if the node E does not receive the declaration of the node A, the change data is sent to the node A again, and the update declaration of the node A is waited; if the node E still does not receive the declaration of the node A, repeatedly sending the change data to the node A, and if the node E does not receive the declaration of the node A for more than three times, indicating that the data updating from the node E to the node A fails and the broadcast of the node E fails; and if other nodes also find the node A abnormal, judging that the node A has an operation fault.
After the services are networked, one node is disconnected from other node networks due to faults, and other nodes automatically disable the service discovery data related to the fault node; if the network disconnection time of the fault node is within the set time value T, after the fault node is on-line again, other nodes restore the original service discovery data of the fault node without resynchronization; and if the network disconnection time of the fault node exceeds a set value T, the fault node exits the service networking, and the service discovery data synchronization needs to be carried out again when the fault node is on line again.
Specifically, the step of quitting the network and rejoining the network by the fault node comprises the following steps:
step 3-1, if the node A is disconnected from the wireless network due to faults and the network connection between the nodes B-E and the node A is lost, synchronously disabling service discovery data related to the node A in the nodes B-E and simultaneously stopping calling the service borne by the fault node;
step 3-2, if the network disconnection time of the node A is within the set time value T, the node A is on line again and establishes connection with the nodes B to E, and service discovery data about the node A is recovered in the nodes B to E without resynchronization; the set time value T is related to the frequency of service updating and can be set according to actual requirements, and if the frequency of system service change is not high and only changes in minutes, T can be set to 30 minutes;
3-3, if the network disconnection time of the node A exceeds a set time value T and the node A is not on line, deleting service discovery data of the local node A by the nodes B to E, and removing the node A from the service ad hoc network; and when the node A is on line again, the step 1-1 to the step 1-6 are required to be executed again for service discovery data synchronization.
The present invention provides a service ad hoc network method based on service discovery data synchronization, and a plurality of methods and ways for implementing the technical solution are provided, and the above description is only a preferred embodiment of the present invention, it should be noted that, for those skilled in the art, without departing from the principle of the present invention, a plurality of improvements and embellishments may be made, and these improvements and embellishments should also be regarded as the protection scope of the present invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (6)
1. A service self-networking method based on service discovery data synchronization is characterized in that under the condition of a wireless local area network, wireless connection is established between nodes on a physical layer, node discovery is realized on a link layer, route discovery and service discovery are carried out on a network layer, service discovery data of the nodes are combined with networking data of a wireless communication network, network networking is carried out between the nodes, and a wireless network completes service self-networking; the service discovery data is a service description carried on the node, is extracted from service description information of an application layer service directory and comprises a service name, a service address and service function description information; the service discovery data is stored in a code mode, and original information is restored through a dictionary mapping table; the nodes discover the services provided by each node in the network according to the service discovery data synchronized by the network layer and realize the calling of the required services; the service is provided by the node running software;
the newly added node primary synchronization service discovery data comprises the following steps:
step 1-1, extracting service discovery data from the service description information of the node of an application layer service directory by a newly added node;
step 1-2, the newly added node and the existing node in the network establish physical connection through a wireless channel in a physical layer;
step 1-3, the newly added node realizes network discovery with the existing node in the network through the function of a wireless network link layer;
step 1-4, the newly added node and the existing node in the network carry out route discovery in the network layer, and send the service discovery data of the node to the existing node in the network, thereby realizing the service discovery data synchronization between the nodes; the service discovery data synchronization is realized by combining service discovery data in the newly added node with wireless communication network data and synchronizing the newly added node with the wireless communication network data to the existing node in the network when the newly added node and the existing node in the network are wirelessly networked; when an existing node in a network discovers a newly added node through the network, service discovery data operated by the newly added node is obtained, and meanwhile, self service discovery data is sent to the newly added node;
step 1-5, adding service discovery data of the newly added node locally by an existing node in the network, and adding service discovery data of the existing node in the network locally by the newly added node;
and 1-6, all nodes in the network realize service discovery and calling through service discovery data of other local nodes, and the service ad hoc network is completed.
2. The method according to claim 1, wherein after the service is networked, if a service status of a node changes, the changed service discovery data is sent to other nodes by broadcasting, and after the other nodes complete modification, the modification status is fed back by a heartbeat mechanism, so that the service discovery data of the modified nodes are updated synchronously.
3. The service ad hoc network method based on the service discovery data synchronization as claimed in claim 2, wherein after the service is networked, a node is disconnected from other nodes due to a fault, and other nodes automatically disable the service discovery data related to the fault node; if the network disconnection time of the fault node is within the set time value T, after the fault node is on-line again, other nodes restore the original service discovery data of the fault node without resynchronization; and if the network disconnection time of the fault node exceeds a set value T, the fault node exits from the service networking, and the service discovery data synchronization needs to be carried out again when the fault node is on line again.
4. The method for ad hoc networking of services based on synchronization of service discovery data according to claim 2, wherein the step of modifying the node to update the service discovery data comprises the steps of:
step 2-1, when the service discovery data of the nodes in the network is not changed, broadcasting to other nodes in the local area network through heartbeat to realize state declaration;
step 2-2, when the service discovery data of a certain node in the network changes, the changed service discovery data is formed and is broadcasted to other nodes in the local area network; after receiving the change notification, the other nodes complete the update of the service discovery data of the local modified node, and perform update declaration in the next heartbeat;
and 2-3, after the modification node receives the update declaration from other nodes in the network, the state update is finished.
5. The method according to claim 4, wherein if the modified node does not receive the update declaration of a node in the network, the modified node sends the change data to the node again to wait for the update declaration of the node; if the modification node still does not receive the declaration of the node, repeatedly sending the change data to the node, repeating more than three times of the declaration of the node still not received, indicating that the data updating from the modification node to the node fails, and indicating that the broadcast of the modification node fails; and if other nodes in the network also find the node to be abnormal, judging that the node has operation failure.
6. The method for self-networking services based on synchronization of service discovery data according to claim 1 or 5, wherein the step of the failed node quitting the network and rejoining the network comprises the following steps:
step 3-1, if a certain node in the network is disconnected from the wireless network due to operation failure, other nodes in the network find that the network connection with the failed node is lost, the service discovery data of the failed node is changed to be unavailable, and meanwhile, the service borne by the failed node is stopped to be called;
3-2, if the network disconnection time of the fault node is within the set time value T, the fault node is on line again, connection with other nodes in the network is established, and the other nodes recover original service discovery data of the fault node;
3-3, if the network disconnection time of the fault node exceeds a set time value T, the fault node is not on line, other nodes delete local service discovery data about the fault node, and the fault node is removed from the service ad hoc network; and when the fault node is on-line again, the step 1-1 to the step 1-6 need to be executed again to carry out service discovery data synchronization.
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