CN106878304A - A kind of method of the link multiplexing of distributed agent - Google Patents
A kind of method of the link multiplexing of distributed agent Download PDFInfo
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- CN106878304A CN106878304A CN201710080060.2A CN201710080060A CN106878304A CN 106878304 A CN106878304 A CN 106878304A CN 201710080060 A CN201710080060 A CN 201710080060A CN 106878304 A CN106878304 A CN 106878304A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
Abstract
The present invention relates to the method that a kind of link of distributed agent is multiplexed, different zones scheduling institution services to form distributed agent using dynamic proxy, local client accesses the application of strange land scheduling institution, two TCP links are set up between two agency services, respectively forward link and reverse link, create a session, the dynamic proxy service that the request message of session passes through forward link transmission to strange land scheduling institution, the response message of session passes through the dynamic proxy service of rl transmission to local scheduling mechanism；When the client of strange land scheduling institution accesses local application, distributed agent creates another session, and uses identical TCP links.The present invention is under the pattern of shared link, two TCP connections are only existed between two different scheduling institutions in theory, to support the two-way communication between agency, different geographical, the efficiency of different stage scheduling institution information exchange are improve, improve the security of Operation of Electric Systems.
Description
Technical field
The present invention relates to technical field of power system communication, the side of the link multiplexing of more particularly to a kind of distributed agent
Method.
Background technology
Recent extra-high voltage construction is quickly propelled, and interregional grid contact is closer, the feature of integration scheduling is increasingly
Substantially.Need the process for carrying out data interaction across mechanism more and more in intelligent grid Dispatching Control System, so different scheduling
There are a large amount of TCP connections between acting on behalf of in mechanism.
Remote service proxy is one in intelligent grid Dispatching Control System communication basic module, it is possible to achieve the not people having the same aspiration and interest
Degree mechanism or the not data interaction between same district, for the intelligent grid scheduling system for building wide area panorama provides interprocess communication
Infrastructure.Current remote service proxy state, point, save three-level regulating and controlling mechanism and realize deployment, support substantial amounts of
Scheduling business, including remote pictures are browsed, remote database access, warning information are remotely pushed etc..In the prior art, agency adopts
Use exclusive link mode, the process of the client access scheduling mechanism B services of scheduling institution A is, client elder generation and local agent
TCP connections are set up, local agent sets up TCP and be connected with remote agent, remote agent is by dispatching the service bus Connection Service of B
Program.The response message of service routine is transmitted to local agent by remote agent, then by local agent back to client.Often
There is the client access service of it is necessary to set up 1 TCP connection.
Under current exclusive link mode, TCP connections occupy the substantial amounts of connection handle of system, CPU, internal memory, network etc.
Resource, has a strong impact on the stable operation of Agent.
Therefore, it is badly in need of only existing two TCP in theory between a kind of method of shared link, two different scheduling institutions at present
Connection, makes distributed agent more stablize, efficiently run.
The content of the invention
In order to solve the above technical problems, under the pattern of shared link, being only existed in theory between two different scheduling institutions
Two TCP connections, to support the two-way communication between agency.Trans-regional client and service routine is entered in the form of logical session
Row data interaction, different sessions are multiplexed a physics TCP link.Shared link pattern can be with high degree reduction different zones
Between act on behalf of connection number, so as to reduce the load of Agent.
For achieving the above object, the present invention provides a kind of chain for strengthening distributed agent operation stability and high efficiency
Road multiplexing method.
The present invention solves its technical problem and takes following technical scheme to realize：
A kind of method of the link multiplexing of distributed agent, different zones scheduling institution is serviced using dynamic proxy and formed point
Cloth is acted on behalf of, and when local client accesses the application of strange land scheduling institution, local agent service is used as output agent, strange land agency
Service is acted on behalf of as input, and distributed agent sets up two TCP links between two agency services, respectively forward link and
Reverse link, and a session is created, the request message of session passes through the dynamic generation of forward link transmission to strange land scheduling institution
Reason service, the response message of session passes through the dynamic proxy service of rl transmission to local scheduling mechanism；
When the client of the strange land scheduling institution accesses local application, distributed agent creates another session,
The dynamic proxy service that the request message of session passes through the rl transmission to local scheduling mechanism, the response message of session
By the dynamic proxy service of the forward link transmission to strange land scheduling institution；
The TCP links are connected for long, will not actively be closed after foundation.
Further, the output agent includes client process module, session data cache module and data forwarding mould
Block, wherein, client process module monitors client request, and the thread process request is then created if client request, will
Client request Reseals message according to session protocol ASP is acted on behalf of, and updates to input-buffer, waits the signal of caching to be output；
Session data cache module stores local dynamic proxy service with the session data between the scheduling institution of strange land, the meeting
Words data include the session data of the request message session data, the response message of service end and control message of client；
Data forwarding module includes the worker thread and link management thread of some transceiving datas, and worker thread receives and dispatches one
Session data in area, link management thread is managed to worker thread.
Further, the input agency includes data forwarding module, session cache module and service end processing module, institute
The request data that data forwarding module receives client is stated, service end processing module is forwarded to, the service end processing module is led to
Cross service thread and application program and set up and be connected, service thread forwards a request to application program, and by the response of application program
Message is updated to the response buffer area of session cache.
Further, it is described act on behalf of session protocol ASP ensure act on behalf of two ends accurately identify each data message source,
Type and purpose, and transmit control command and error message, the message format by order successively setting specified byte length
Session number, regional number, service number, type of message, priority, control bit, error number and message length composition.
Further, the client process module includes client monitor and thread pool, and the thread pool has some
Individual client operation thread cworker, client monitor is responsible for monitoring client request in real time, when there is new client request
When, the monitor distributes a cworker thread from thread pool and responds the new client, cworker threads and visitor
After connection is set up at family end, receive client message, and according to session protocol ASP encapsulation client messages are acted on behalf of, be put into respective area
In the session cache area in domain.
Further, the service end processing module includes several service ends worker thread sworker, service end work
After thread receives the request message of data transmission module forwarding, session protocol ASP heads are acted on behalf of by parsing and selects to obtain application
Program, and request message is sent to the application program of response, response message is sealed after then obtaining application response message
Dress up and act on behalf of during session protocol ASP messages keep in response buffer area.
Further, the data forwarding module is made up of some groups of data transfer threads, and session association is acted on behalf of by what is responded
View ASP messages are sent to designated area.
Further, the mechanism of abnormality processing, client and remote server share abnormal information, inspection by protocol massages
Measure and update to acting on behalf of the head of session protocol ASP mistake numbering after abnormal conditions, and notify extremely corresponding module.
Advantages and positive effects of the present invention are：
1st, the present invention only exists two TCP connections in theory under the pattern of shared link between two different scheduling institutions,
To support the two-way communication between agency, different geographical, the efficiency of different stage scheduling institution information exchange are improve, improve electricity
The security of Force system operation.
2nd, the present invention after link multiplexing method is improved, more stablize, operational efficiency is higher, Ke Yizhi by distributed agent
Concurrency higher is held, while greatly reducing the occupancy of program runtime system resource.
Brief description of the drawings
Fig. 1 is the principle schematic of distributed agent link multiplexing of the present invention；
Fig. 2 is the structural representation of distributed agent link multiplexed information transmission of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right
The present invention is further elaborated.It should be appreciated that structure chart described herein and specific embodiment are only used to explain this
Invention, is not intended to limit the present invention.
The embodiment of the present invention is described in further detail below in conjunction with accompanying drawing：
The invention provides the method that a kind of link of distributed agent is multiplexed, Fig. 1 is distributed agent link of the present invention
The principle schematic of multiplexing, as shown in figure 1, the general thought of link multiplexing is with logical session alternate physical link, client
Communicated by session between remote service, all sessions of each transmission direction between two scheduling institutions are multiplexed a thing
Reason link.When the S1 for dispatching the client C1 access schedulings B of A is applied, agency can be that the communication between C1, B1 creates a session
1 (session1), while setting up two TCP links of AB, BA, then the request message of session1 passes through AB link transmissions,
The response message of session1 passes through BA link transmissions.If now client C2 wants the S2 of access scheduling mechanism B to apply, agency
The request message that session session2, session2 can again be created is multiplexed AB links with the request message of session1,
The response message multiplexing BA links of session1 and session2.TCP links are connected for long between agency, will not be actively after foundation
Close.
Fig. 2 is the structural representation of distributed agent link multiplexed information transmission of the present invention, transmission such as Fig. 2 institutes of information
Show, agency is main to realize that link multiplexing function supports the output agent of link shared model main by visitor by introducing conversation mechanism
Family end processing module, session data cache module, the part of data forwarding module three composition.Client process module is responsible for monitoring visitor
Family end is asked, and the thread process request is then created if client request.Specially by client request according to acting on behalf of session
Agreement (Agent session protocol, ASP) Reseals message and is updated input-buffer, at the same etc. it is to be output
The semaphore of caching.Session data caching is mainly used in storage local agent with the session data between each scheduling institution, including visitor
The request message at family end, the response message of service end and control message, store up in request caching and response buffer respectively.Data forwarding
Module includes the worker thread and link management thread of N number of responsible transceiving data.Each worker thread is responsible for receiving and dispatching a region
Session data.Link management thread is responsible for being managed worker threads.
Input agency includes data forwarding module, session cache module and service end processing module.Data forwarding module leads to
Cross opposite end forwarding module and receive the request data of client, and forward it to service end processing module.Service end processing module
Service thread directly with service routine set up be connected, service thread forward a request to service routine and will service response report
Text updates the response buffer area to session cache.
ASP protocol theories
It is to ensure that client and server is transregional that session protocol (Agent session protocol, ASP) is acted on behalf of in design
The basis of telecommunication, protocol headers have recorded the information such as session number, regional number, service number.ASP agreements ensure that agency two
End can accurately identify source, type and the purpose of each data message, while control command can be transmitted by the agreement
And error message, it is ensured that two ends program can carry out efficient, safe communication by the form of session.
Session protocol ASP is acted on behalf of to ensure to act on behalf of source, type and purpose that two ends accurately identify each data message, and
Transmission control command and error message, the message format by order successively setting specified byte length session number, area
Domain number, service number, type of message, priority, control bit, error number and message length composition.For example, four words before header
Save in storage session number.2 bytes are regional numbers afterwards, and regional number is used to represent that the session will be sent to that region.Clothes
Business number accounts for two bytes, for representing the session message is which service routine asked.Type of message accounts for 1 byte representation should
The type of session message, mainly there is request message, response message, error message, the control type of message four.Precedence field is used
In the priority for representing the session transmissions, it is ensured that the session low higher than priority of the conversational response of high priority.Control bit master
Store the control information between session.Error number accounts for 2 bytes, for representing the abnormal information in data transmission procedure, such as
Suspension mistake, connection failure, service unavailable etc..
Data processing module includes client data processing module and service end processing module, and client process module includes
One client monitor and thread pool, there is several client operation threads cworker in thread pool.Client monitor is born
Duty monitors client request in real time.If new client request, monitor can distribute a cworker line from thread pool
Cheng Xiang should client.Cworker threads are set up after being connected with client, receive client message, and according to ASP protocol encapsulations
Client message simultaneously puts it to the session cache area of client's respective regions.Output in the region session cache simultaneously is cached
Middle wait semaphore.Once output caching it is readable, worker thread will from output caching in reading service end conversational response message,
And it is returned to client.
Service end processing module includes several service end worker threads sworker.Sworker threads receive data transfer
After the request message of module forwards, can obtain which service routine asked by parsing ASP protocol headers, and request message is sent out
Give the service routine of response.Then response message is packaged into ASP protocol massages after acquisition service routine response message to keep in
To in response buffer area.
Data forwarding module is mainly responsible for the corresponding ASP protocol massages of forwarding to designated area, by some groups of data transfers
Thread is constituted, and every group has two thread sworker and rworker, wherein sworker to be responsible for sending data, and rworker services are negative
Duty receives data.The sworker threads of output agent forwarding module are responsible in the request buffer area of respective regions buffer area obtaining
The request message for taking session is sent to the data forwarding module of respective regions.The rworker threads of output agent forwarding module are born
Duty receives the data buffer storage of respective regions agency in response buffer area, and the phase of client process module is notified by semaphore
Close thread access evidence.The rworker threads of output agent forwarding module are responsible for receiving request message and are transmitted to service end treatment
Module.Sworker threads can read the response message in response buffer area after obtaining response buffer area semaphore, and be sent to response
The Agent in region.
Exception handling
The link that client and remote server carry out message process during data exchange is very more, in order that between module not
Can influence each other, agency uses the design concept of loose coupling, each link to use asynchronous system.This design causes each module
Cannot direct communication, abnormality sensing ability is poor.Therefore agency specially devises protocol anomaly treatment mechanism, by protocol massages
Shared abnormal information.
The common abnormal conditions of agency have client to disconnect mistake, network time out error, update buffer area failure mistake etc.,
Refer to table one.Acting on behalf of after each module detects corresponding abnormal conditions, mistake numbering can be updated the head for arriving ASP agreements, and be notified
Corresponding module.For example after client sends message request, how to be input into agency check remote service program do not exist or
Person cannot position.The error number that the related linear program of agent data can update ASP headings is 1005, and message is postbacked into request
End.Client process module can in time notify that client carries out respective handling after obtaining the message.
Table one acts on behalf of Common Abnormity situation
It is emphasized that embodiment of the present invention is illustrative, rather than limited, therefore present invention bag
The embodiment for being not limited to described in specific embodiment is included, it is every by those skilled in the art's technology according to the present invention scheme
The other embodiment for drawing, also belongs to the scope of protection of the invention.
Claims (8)
1. the method that a kind of link of distributed agent is multiplexed, it is characterised in that different zones scheduling institution uses dynamic proxy
Service forms distributed agent, and when local client accesses the application of strange land scheduling institution, local agent service is used as output generation
Reason, strange land agency service is acted on behalf of as input, and distributed agent sets up two TCP links between two agency services, respectively
It is forward link and reverse link, and creates a session, the request message of session is dispatched by forward link transmission to strange land
The dynamic proxy service of mechanism, the response message of session is taken by the dynamic proxy of rl transmission to local scheduling mechanism
Business；
When the client of the strange land scheduling institution accesses local application, distributed agent creates another session, session
The request message dynamic proxy service that passes through the rl transmission to local scheduling mechanism, the response message of session passes through
The forward link transmission to strange land scheduling institution dynamic proxy service；
The TCP links are connected for long, will not actively be closed after foundation.
2. the method that the link of distributed agent according to claim 1 is multiplexed, it is characterised in that：The output agent bag
Client process module, session data cache module and data forwarding module are included, wherein, client process module monitors client
Request, the thread process request is then created if client request, by client request according to acting on behalf of session protocol ASP again
Encapsulated message, updates to input-buffer, waits the signal of caching to be output；
Session data cache module stores local dynamic proxy service with the session data between the scheduling institution of strange land, the session number
According to the session data of the request message session data including client, the response message of service end and control message；
Data forwarding module includes the worker thread and link management thread of some transceiving datas, and worker thread receives and dispatches an area
Interior session data, link management thread is managed to worker thread.
3. the method that the link of distributed agent according to claim 1 is multiplexed, it is characterised in that：The input agency bag
Data forwarding module, session cache module and service end processing module are included, the data forwarding module receives the request of client
Data, are forwarded to service end processing module, and the service end processing module is set up with application program by service thread and is connected, and takes
Business thread forwards a request to application program, and the response message of application program is updated to the response buffer area of session cache.
4. the method that the link of distributed agent according to claim 2 is multiplexed, it is characterised in that：It is described to act on behalf of session association
View ASP ensures that acting on behalf of two ends accurately identifies source, type and the purpose of each data message, and transmits control command and mistake
Information, the message format by order successively setting specified byte length session number, regional number, service number, message class
Type, priority, control bit, error number and message length composition.
5. the method that the link of distributed agent according to claim 2 is multiplexed, it is characterised in that：The client process
Module includes client monitor and thread pool, and the thread pool has several client operations thread cworker, client prison
Device is listened to be responsible for monitoring client request in real time, when there is new client request, the monitor distributes one from thread pool
Cworker threads respond the new client, and cworker threads are set up after being connected with client, receive client message, and
According to session protocol ASP encapsulation client messages are acted on behalf of, it is put into the session cache area of respective regions.
6. the method that the link of distributed agent according to claim 3 is multiplexed, it is characterised in that：The service end treatment
Module includes several service ends worker thread sworker, and service end worker thread receives the request of data transmission module forwarding
After message, session protocol ASP heads are acted on behalf of by parsing and selects to obtain application program, and request message is sent to answering for response
With program, then to obtain be packaged into response message after application response message and act on behalf of session protocol ASP messages and keep in sound
In answering buffer area.
7. the method that the link of the distributed agent according to any one of Claims 2 or 3 is multiplexed, it is characterised in that：Institute
Data forwarding module is stated to be made up of some groups of data transfer threads, by respond act on behalf of session protocol ASP messages be sent to it is specified
Region.
8. the method that the link of distributed agent according to claim 1 is multiplexed, it is characterised in that：The machine of abnormality processing
System, client and remote server share abnormal information by protocol massages, update mistake numbering after detecting abnormal conditions
To acting on behalf of the head of session protocol ASP, and notify the module of exception response.
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