CN105260479A - observer pattern-based real-time database real time data publishing method - Google Patents
observer pattern-based real-time database real time data publishing method Download PDFInfo
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Abstract
The invention discloses an observer pattern-based real-time database real time data publishing method. According to the method, on one hand, a client application program is decoupled from a real-time database and a dependency relationship between modules is removed; on the other hand, time consumption and overhead of hardware resources and network resources, caused by the fact that a client frequently accesses a server to acquire real time data, are avoided, and subscribed data can be immediately published to a client program when the real time data are changed; the problem that as an existing subscribing-publishing system real-time database directly subscribes data from the server by an application program, a great amount of redundant subscribed data occupy system resources is solved, the real-time performance of the data is ensured, and concurrent access by theoretically infinite clients is supported.
Description
Technical field
The present invention relates to a kind of real-time data base real-time data warehouse method based on Observer Pattern, belong to computer software technical field.
Background technology
Real-time data base (RTDB-RealTimeDataBase) is a branch of Database Systems development, is that database technology produces in conjunction with real-time processing technique.Real-time data base is electric power, the energy, the real-time control system that the Industry Control occasions such as chemical industry extensively adopt, the core of the system such as data acquisition and surveillance, be mainly used in gathering and manage the production process data from various collecting device, and providing unified real time data releasing platform, usually as the core in enterprise informationization management system and maincenter, be the bridge that enterprise realizes automatically controlling to from equipment high-rise planning management, carry the effect of forming a connecting link.
Namely the most important characteristic of real-time data base is real-time, and real-time comprises the real-time of data and the real-time of affairs.Main and the collection in worksite device of the real-time of data, speed, the efficiency of real-time data acquisition driver module are relevant.Affairs real-time refers to the real-time capacity of real-time data base to issued transaction, comprises the speed of customer in response end request of access, issues the speed etc. of real time data to client.Other performances mainly comprise supports access client quantity, i.e. Concurrency Access performance; Taking system resource, i.e. the aspects such as the efficiency of communication.
In prior art, client obtains fast-changing real time data in real time, and need frequent access real-time data base and take comparatively multiserver software and hardware system resource, heavy system communication network is born.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of real-time data base real-time data warehouse method based on Observer Pattern.
In order to achieve the above object, the technical solution adopted in the present invention is:
Based on a real-time data base real-time data warehouse method for Observer Pattern, based on the framework of client-server, adopt 2 grades of subscription-issue mechanisms, in server and client side's built-in subscription-release module respectively;
Subscription-the release module of client: the subscribe request being in charge of client application, the subscribe request of registrable client application, after receiving the real-time data warehouse of server, to its real time data of subscribing to of application issued of registration;
Subscription-the release module of server: the subscribe request being in charge of client, the subscribe request of registrable client, when real time data meets issue condition, the client to registration issues its real time data of subscribing to;
Real-time data base real-time data warehouse process is,
1) client application subscribes to real time data to the subscription-release module of client;
2) subscription-release module of client receives and the subscribe request of registered client application program, and subscribes to real time data to server;
3) subscription-release module of server receives and the subscribe request of registered client;
4) when real time data meets issue condition, issue to the client of subscribing to this real time data;
5) when the subscription-release module of client receives the real time data of server issue, to the real time data of client application distribution subscription.
Subscription-the release module of client is by hash table and the request of linked list data structure managing subscribing, and wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client application handle chained list of these data for value;
Subscription-the release module of server is by hash table and the request of linked list data structure managing subscribing, and wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client-side information chained list of these data for value.
When subscription-the release module of client receives the subscribe request of client application, whether subscribedly these data are searched in hash table, then obtain the application program handle chained list that these data are corresponding in this way, if there is not this application program handle in chained list, then the application program handle of new subscribe request is joined chained list end; If these data are not subscribed, then newly-built application program handle chained list, and in chained list, add this subscription application program handle, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table, send subscribe request to server simultaneously;
Subscription-the release module of server is when receiving the subscribe request of client, and whether subscribed, then obtain the client-side information chained list corresponding to these data in this way if in hash table, searching these data; If there is not this client-side information in chained list, then new subscribe request client-side information is joined chained list end; If these data do not have subscribed, then need newly-built client-side information chained list, and add this client-side information, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table.
Subscription-the release module of client also can nullify the subscribe request of client application, and the subscription-release module of server also can nullify the subscribe request of client;
When subscription-the release module of client receives the cancellation subscribe request of client application, whether subscribedly these data are searched in hash table, in hash table, then obtain the application program handle chained list that data are corresponding in this way, traversal chained list, find this application program handle, and from chained list, delete this application program handle; If after deleting, chained list is empty, then illustrate in client, do not had these data of application subscription, deletes and is canceled the data label name of subscription and the mapping relations of chained list, and delete this chained list, send cancellation subscribe request to server in hash table;
When subscription-the release module of server receives and nullifies subscribe request, in hash table, whether subscribed search these data, in hash table, then obtain client-side information chained list corresponding to these data in this way, traversal chained list, find this client-side information, from chained list, delete this client-side information.
Client-side information comprises IP address and the host name information of client.
Triggering the issue condition issued is, real time data variation range exceedes its change dead band or exceedes the waiting-timeout time of regulation apart from issuing time last time.
Real time data is published to client application from server, and time complexity is O (1).
The beneficial effect that the present invention reaches: the present invention is subscribed to by 2 times-issued, achieve the method that client application obtains server end real time data, on the one hand by client application and real-time data base decoupling zero, dependence between cancellation module, on the other hand, the time loss that client frequent access services device acquisition real time data is brought is avoided, the expense of hardware resource, Internet resources, when real time data changes, can the data of distribution subscription immediately to client-side program; Solve the problem of the bulk redundancy subscription data occupying system resources that existing subscription-issue mechanism real-time data base is brought directly to server subscription data by application program, ensure that the real-time of data, and support the Concurrency Access of theory unlimited amount client.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention.
Fig. 2 is the subscription-release module schematic diagram of client.
Fig. 3 is the subscription-release module schematic diagram of server.
Fig. 4 is process flow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, be the system based on server-client architecture, comprise server and client side, server is built-in with real-time data base and subscription-release module, and client is built-in with application program and subscription-release module.
Client application: obtain and use the entity of real time data in real-time data base, namely concrete user.
As shown in Figure 2, subscription-the release module of client: the subscribe request being in charge of client application, registrable, the to nullify subscribe request of client application, after receiving the real-time data warehouse of server, to its real time data of subscribing to of application issued of registration.
Subscription-the release module of client is by hash table and the request of linked list data structure managing subscribing, and wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client application handle chained list of these data for value.
The subscribe request process of the subscription-release module registered client of client is:
When subscription-the release module of client receives the subscribe request of client application, whether subscribedly these data are searched in hash table, then obtain the application program handle chained list that these data are corresponding in this way, if there is not this application program handle in chained list, then the application program handle of new subscribe request is joined chained list end; If these data are not subscribed, then newly-built application program handle chained list, and in chained list, add this subscription application program handle, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table, send subscribe request to server simultaneously.
The subscribe request process of subscription-release module cancellation client of client is:
When subscription-the release module of client receives the cancellation subscribe request of client application, whether subscribedly these data are searched in hash table, in hash table, then obtain the application program handle chained list that data are corresponding in this way, traversal chained list, find this application program handle, and from chained list, delete this application program handle; If after deleting, chained list is empty, then illustrate in client, do not had these data of application subscription, deletes and is canceled the data label name of subscription and the mapping relations of chained list, and delete this chained list, send cancellation subscribe request to server in hash table.
Real-time data base: be responsible for gathering and storing real time data, management accessing work.
As shown in Figure 3, the subscription-release module of server: the subscribe request being in charge of client, registrable, the subscribe request of client of nullifying, when real time data meets issue condition, the client to registration issues its real time data of subscribing to.
Subscription-the release module of server is by hash table and the request of linked list data structure managing subscribing, and wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client-side information chained list of these data for value; Client-side information comprises IP address and the host name information of client.
The subscribe request process of the subscription-release module registered client of server is:
Subscription-the release module of server is when receiving the subscribe request of client, and whether subscribed, then obtain the client-side information chained list corresponding to these data in this way if in hash table, searching these data; If there is not this client-side information in chained list, then new subscribe request client-side information is joined chained list end; If these data do not have subscribed, then need newly-built client-side information chained list, and add this client-side information, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table.
The subscribe request process of subscription-release module cancellation client of server is:
When subscription-the release module of server receives and nullifies subscribe request, in hash table, whether subscribed search these data, in hash table, then obtain client-side information chained list corresponding to these data in this way, traversal chained list, find this client-side information, from chained list, delete this client-side information.
As shown in Figure 4, based on the real-time data base real-time data warehouse method of Observer Pattern, the method base adopts 2 grades of subscription-issue mechanisms, and detailed process is:
1) client application subscribes to real time data to the subscription-release module of client;
2) subscription-release module of client receives and the subscribe request of registered client application program, and subscribes to real time data to server;
3) subscription-release module of server receives and the subscribe request of registered client;
4) when real time data meets issue condition, issue to the client of subscribing to this real time data;
Triggering the issue condition issued is, real time data variation range exceedes its change dead band or exceedes the waiting-timeout time of regulation apart from issuing time last time;
5) when the subscription-release module of client receives the real time data of server issue, to the real time data of client application distribution subscription.
Real time data is published to client application from server, and time complexity is O (1), and ensure that the real-time of issue, server subscribes to client-side information by linked list maintenance, can unlimited client Concurrency Access in support theory.
Subscribe to for client application real time data, data stream and issued transaction concrete steps as follows:
1. client application handle is Ha, subscribes to the real time data that label is called Va.
2. subscription-the release module of client is in application program handle hash table HdlHash, by tag name Va retrieve application handle chained list HdlList, if found, and Ha is not in HdlList, then add application program handle Ha at HdlList tail end, otherwise newly-built chained list HdlList, and in HdlList, add application program handle Ha, in HdlHash, set up the mapping relations of Va and HdlList.
3. user end to server sends subscribe request.
4. server receives subscribe message message, and resolves, the information ClientInfo such as the IP address of the data label name Va that acquisition will be subscribed to and client and Hostname.
5. subscription-the release module of server is in client-side information hash table ClientHash, client-side information chained list ClientList is subscribed to by tag name Va retrieval, if find and ClientInfo not in ClientList, it then adds client-side information ClientInfo at ClientList chained list tail end, otherwise newly-built chained list ClientList, and in ClientList, add client-side information ClientInfo, in ClientHash, set up the mapping relations of Va and ClientList.
6. in real-time data base, the value variation range of variable V a exceedes its change dead band or exceedes the waiting-timeout time of regulation apart from issuing time last time, trigger issue condition, subscription-the release module of server end retrieves client-side information hash table ClientHash by Va, obtain client-side information chained list ClientList, traversal ClientList, the client that each node records in ClientList is successively by the instantaneous value of TCP/IP communications protocol distributing data Va.
7. client receives server releasing news to data Va, subscription-the release module of client obtains application program handle chained list HdlList by Va retrieve application handle hash table HdlHash, traversal HdlList, successively to the real time data of application issued data Va.
Said method is on the one hand by client application and real-time data base decoupling zero, dependence between cancellation module, on the other hand, avoid the time loss that client frequent access services device acquisition real time data is brought, the expense of hardware resource, Internet resources, when real time data changes, can the data of distribution subscription immediately to client-side program; Solve the problem of the bulk redundancy subscription data occupying system resources that existing subscription-issue mechanism real-time data base is brought directly to server subscription data by application program, ensure that the real-time of data, and support the Concurrency Access of theory unlimited amount client.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. based on a real-time data base real-time data warehouse method for Observer Pattern, it is characterized in that: based on the framework of client-server, adopt 2 grades of subscription-issue mechanisms, in server and client side's built-in subscription-release module respectively;
Subscription-the release module of client: the subscribe request being in charge of client application, the subscribe request of registrable client application, after receiving the real-time data warehouse of server, to its real time data of subscribing to of application issued of registration;
Subscription-the release module of server: the subscribe request being in charge of client, the subscribe request of registrable client, when real time data meets issue condition, the client to registration issues its real time data of subscribing to;
Real-time data base real-time data warehouse process is,
1) client application subscribes to real time data to the subscription-release module of client;
2) subscription-release module of client receives and the subscribe request of registered client application program, and subscribes to real time data to server;
3) subscription-release module of server receives and the subscribe request of registered client;
4) when real time data meets issue condition, issue to the client of subscribing to this real time data;
5) when the subscription-release module of client receives the real time data of server issue, to the real time data of client application distribution subscription.
2. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 1, it is characterized in that: the subscription-release module of client is by hash table and the request of linked list data structure managing subscribing, wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client application handle chained list of these data for value;
Subscription-the release module of server is by hash table and the request of linked list data structure managing subscribing, and wherein, hash table is called key assignments with the label of subscribed data, to subscribe to the client-side information chained list of these data for value.
3. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 2, it is characterized in that: when the subscription-release module of client receives the subscribe request of client application, whether subscribedly these data are searched in hash table, then obtain the application program handle chained list that these data are corresponding in this way, if there is not this application program handle in chained list, then the application program handle of new subscribe request is joined chained list end; If these data are not subscribed, then newly-built application program handle chained list, and in chained list, add this subscription application program handle, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table, send subscribe request to server simultaneously;
Subscription-the release module of server is when receiving the subscribe request of client, and whether subscribed, then obtain the client-side information chained list corresponding to these data in this way if in hash table, searching these data; If there is not this client-side information in chained list, then new subscribe request client-side information is joined chained list end; If these data do not have subscribed, then need newly-built client-side information chained list, and add this client-side information, the newly-built tag name of subscribed data and the mapping relations of this chained list in hash table.
4. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 2, it is characterized in that: the subscription-release module of client also can nullify the subscribe request of client application, the subscription-release module of server also can nullify the subscribe request of client;
When subscription-the release module of client receives the cancellation subscribe request of client application, whether subscribedly these data are searched in hash table, in hash table, then obtain the application program handle chained list that data are corresponding in this way, traversal chained list, find this application program handle, and from chained list, delete this application program handle; If after deleting, chained list is empty, then illustrate in client, do not had these data of application subscription, deletes and is canceled the data label name of subscription and the mapping relations of chained list, and delete this chained list, send cancellation subscribe request to server in hash table;
When subscription-the release module of server receives and nullifies subscribe request, in hash table, whether subscribed search these data, in hash table, then obtain client-side information chained list corresponding to these data in this way, traversal chained list, find this client-side information, from chained list, delete this client-side information.
5. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 2-4 any one, is characterized in that: client-side information comprises IP address and the host name information of client.
6. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 1, it is characterized in that: triggering the issue condition issued is, real time data variation range exceedes its change dead band or exceedes the waiting-timeout time of regulation apart from issuing time last time.
7. a kind of real-time data base real-time data warehouse method based on Observer Pattern according to claim 1, it is characterized in that: real time data is published to client application from server, time complexity is O (1).
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Cited By (6)
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| CN106210099A (en) * | 2016-07-18 | 2016-12-07 | 珠海格力电器股份有限公司 | Data processing system and method |
| CN108459941A (en) * | 2018-03-09 | 2018-08-28 | 深圳达实智能股份有限公司 | A kind of method and system of distributed data acquisition and software supervision |
| CN110619080A (en) * | 2019-09-09 | 2019-12-27 | 珠海格力电器股份有限公司 | Real-time data display system and method capable of improving data loading rate |
| CN112199210A (en) * | 2020-09-21 | 2021-01-08 | 中国建设银行股份有限公司 | Data processing method and device based on Internet of things, computer equipment and medium |
| CN113992741A (en) * | 2020-07-10 | 2022-01-28 | 华为技术有限公司 | Method and device for publishing data index |
| CN114598944A (en) * | 2022-03-28 | 2022-06-07 | 重庆长安汽车股份有限公司 | Periodic signal processing system, method, computer device and storage medium |
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