CN103746959B - The implementation method of the communication mechanism of Java modules and C modules under OSGi environment - Google Patents
The implementation method of the communication mechanism of Java modules and C modules under OSGi environment Download PDFInfo
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- CN103746959B CN103746959B CN201310637671.4A CN201310637671A CN103746959B CN 103746959 B CN103746959 B CN 103746959B CN 201310637671 A CN201310637671 A CN 201310637671A CN 103746959 B CN103746959 B CN 103746959B
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Abstract
The present invention provides a kind of implementation method of Java and C communication mechanism under OSGi environment, and java applet is operated under OSGi framework, and c program is run in Linux system, and the implementation method comprises at least：Transfer message Bundle is registered under OSGi environment, java applet is used messenger service, while the message that c program sends over can be responded；C program establishes communication socket, or java applet by initiating communication request to transfer message Bundle with transfer message Bundle, and the socket with c program is established by transfer message Bundle；C program receives and dispatches socket message to be communicated with java applet by transfer message Bundle；Java applet is communicated by transfer message Bundle messenger service with c program.The implementation method of Java and C communication mechanism has the high efficiency and security of communication concurrently under the OSGi environment of the present invention；Exploitation JNI plenty of time is eliminated, while is communicated again for JAVA with C and provides reliable storehouse support, good bridge has been built with Java communication environments for C.
Description
Technical field
The present invention relates to the technical field of computer communication, more particularly to the communication of Java and C under OSGi environment a kind of
The implementation method of mechanism.
Background technology
The function of Java language is very powerful, but is not omnipotent.In Java language, having abandoned pointer, this is powerful
And close language tool is interacted with bottom.List is from efficiency aspect, and for Java compared with C, Java execution efficiency is remote
Far below C.Require higher for some algorithms, Java is not just best selection.Java is a kind of language of object-oriented
Speech, in the APP applications of various numerous and complicateds, Java is standby to enjoy praise, and good name widely spreads.Thus bring Java and C and association coexists
The problem of with cooperation.This point is just made in consideration in Java creators at the beginning of exploitation, is provided in Java and C/C
++ DLL, here it is Java Native Interface（Java Native Interface, JNI）.
Unix Domain Socket are Uinx domains socket, the communication between the process run on same machine.
The execution efficiency of Unix domain socket is higher than the socket of internet domain, and it is to realize the bridge that Java communicates with C.
Open Service Gateway Initiative, i.e. OSGi（JSR291）Also it is referred to as the dynamic analog of Java language
Block system, it defines an architecture for the exploitation of modular applications.Briefly, can be set by OSGi on backstage pair
The normal operation without interrupting the equipment is installed, upgraded or unloaded to slave component.OSGi as the modular carriers of Java,
Operate in Java Virtual Machine（Java Virtual Machine, JVM）On.
In the prior art, solves the communication issue between java applet and c program, the mode of generally use has following several
Kind：
（1）Socket communication modes
Socket is built upon host-host protocol（Mainly TCP and UDP）On a kind of socket specification.Socket shields
The difference of bottom communication software and specific operating system so that any two are mounted with Transmission Control Protocol software and realize and to control
Communication between the computer of specification is possibly realized.The method to be communicated using the Socket of standard, it is possible to achieve any platform is appointed
Socket communications between what process, so as to realize the transmission of information.However, this implementation can only operate in any two
It is mounted between the machine of Transmission Control Protocol, is communicated using web socket, and then can not runs and communicate in other circumstances.
（2）File-sharing mode
The information such as the parameter that communicating pair transmits needs, are transmitted by file.However, this method should be noted
Thread synchronization and security problems, and its efficiency is also relatively low.Simultaneously as which is although relatively simple easy
With, but the security of the operation to file is then into the biggest obstacle of communication.Therefore, in the higher and logarithm to efficiency requirements
It is just inadvisable according to the higher occasion of safety requirements, this mode.
（3）Pass through JNI modes
JNI is the standard interface write Java native methods and JVM is embedded into native application.Compiled by JNI
Program, can very easily accomplish cross-platform transplanting.It is Java communication modes more popular so far using JNI.It is single
Solely carry out larger flexibility to the communication band between JAVA and C using JNI.But JNI is a series of general-purpose interfaces in itself, its
Realization depends on the technical solution of designer in itself, therefore brings uncertainty.
In summary, the running environment of currently existing scheme is different and respectively has advantage and disadvantage, and some runs on different main frames, had
Run on JVM.OSGi is the standard newly proposed in recent years, and Java modularizations are development trends more popular at present, therefore
Under embedded platform, in OSGi environment, a set of Java and C communication solution are proposed, while can solve the problem that communication security, lead to
The problems such as believing efficiency then seems and is highly desirable.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide Java and C under a kind of OSGi environment
Communication mechanism implementation method so that the task of task and C environment under JAVA environment can communicate.
In order to achieve the above objects and other related objects, the present invention provides the communication equipment of Java and C under OSGi environment a kind of
The implementation method of system, wherein java applet are operated under OSGi framework, and c program is run in Linux system, the implementation method
Comprise at least：Transfer message Bundle is registered under OSGi environment, java applet is used messenger service, while can respond
The message that c program sends over；C program establishes communication socket with transfer message Bundle, or java applet passes through in
Turn message Bundle and initiate communication request, the socket with c program is established by transfer message Bundle；C program is disappeared by transfer
Breath Bundle transmitting-receivings socket message to communicate with java applet；Java applet by transfer message Bundle messenger service with
C program communicates.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：Used between transfer message
Unix domain socket is communicated.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：Transfer message includes message
Head and message data.
Further, according to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：It is described to disappear
Ceasing head includes the length of source message id, purpose message id, the type of message and message data.
Further, according to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：C program and
Java applet can check message header field when receiving transfer message, if not meeting what message header defined, will be regarded as illegally disappearing
Breath, discard processing is carried out, and continue message and intercept.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：Transfer message uses byte
Stream is transmitted reception.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：The transfer task of c program
Including sending thread and receiving thread, it is each responsible for sending a message in Java context, and receives and sent out from Java context
The message come.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：The transfer of java applet is appointed
The Bundle being engaged in as an OSGi；When the Bundle is activated, initialization is sent into connection and receives connection, and is issued
Messenger service.
According to the implementation method of Java and C communication mechanism under above-mentioned OSGi environment, wherein：Java transfer tasks connect
Take-up journey and user task operate same message sink object instance；It is all synchronous side to receive the message write-in of object and read
Method.
As described above, the present invention OSGi environment under Java and C communication mechanism implementation method, have below beneficial to effect
Fruit：
（1）The present invention uses Unix domain socket, itself also serves as a kind of mode of socket communications, but be process
Between a kind of mode for communicating, therefore have the high efficiency and security of communication concurrently；
（2）JNI framework, which is realized, utilizes the JUDS to increase income（Java Unix Domain Sockets）Directly grasped in storehouse
Make, so as to eliminate exploitation JNI plenty of time, while communicated again for JAVA with C and provide reliable storehouse support；
（3）It can be very good to realize under OSGi framework using the Apache Felix to increase income, the interactive maintenance of each module, be
C has built good bridge with Java communication environments；
（4）Communication protocol proposed by the present invention can realize the transmission of variable data, high-volume bytes of stream data, and its is efficient
Rate be derived from agreement in itself and and it is uncomplicated, and encode simple.
Brief description of the drawings
The communication mechanism that Fig. 1 is shown as Java and C under the OSGi environment of the present invention realizes frame diagram；
Fig. 2 is shown as the flow chart of message sink under C environment in the present invention；
Fig. 3 is shown as establishing socket flow chart in the present invention；
Fig. 4 is shown as in the present invention occurring in buffer area processing method when multiple messages or imperfect the last item
Flow chart；
Fig. 5 is shown as the structural representation of message sink object instance in the present invention.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
It should be noted that the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way,
Then the component relevant with the present invention is only shown in schema rather than is painted according to component count, shape and the size during actual implement
System, kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its assembly layout kenel also may be used
Can be increasingly complex.
OSGi most original target is aiming at embedded and home gateway application, but it is oriented to for modularization, component
And service orientation also has relatively perfect support.More famous OSGi framework has Equinox and Apache Felix etc.
Deng.The present invention supports preferable Felix from Java lab environments.Felix is that the Apache of an OSGi edition 4 specification is realized.
Felix operation is simple, and the CLI command interface of hommization easily can carry out tub of tissue to the Bundle under OSGi environment
Reason.Meanwhile OSGi also defines the communication between Bundle in itself, so as to be brought convenience for transfer message, without definition in addition
Transfer message mechanism.
OSGi environment includes transfer message module, library component module, and JavaApp custom block.
Wherein, transfer message module be the present invention core Java modules, wherein principle be also based on message transmitting-receiving it is whole
Close, including receive message procedure, send message interface, message pool, message factory etc..
Library component module refers to this kind of Support Library of cling, gstream and is put into, it is necessary to weave into Bundle in OSGi environment.Storehouse
Assembly module is the basis operation and function library to JavaApp.
JavaApp custom block is to operate in each Java applications of OSGi environmentally.
The communication mechanism of the present invention is based on Embedded linux environment, is equipped on VOS（Virtual OS）On platform,
JVM is run under linux, and is implanted into OSGi environment.Communication under C environment between different task utilizes linux message queue
Realize；The service registry mechanism that communication under Java context between different task is provided using OSGi framework is realized.
Reference picture 1, Java and C communication mechanism is as follows under OSGi environment：
Transfer message Bundle is registered under OSGi environment, java applet is used messenger service, while C can be responded
The message that program sends over；
C program and transfer message Bundle establish communication socket, or java applet is by transfer message Bundle
Communication request is initiated, the socket with c program is established by transfer message Bundle；
C program receives and dispatches socket message to be communicated with java applet by transfer message Bundle；Java applet is in
The messenger service and c program for turning message Bundle communicate.
C environment and Java context have various transfer task process, are responsible for the parsing forwarding of message.Under all C environment
Task if it is desired to the task communication under Java context, it is necessary to by transfer message complete.Use between transfer message
Unix domain socket communication.
In the present invention, the transfer message communicated between OSGi and linux environment process adds message data using message header
Organizational form completes communication requirement.The parsings such as message header part energy completion message destination address, type of message, message-length,
Completion message verifies, so as to ensure that transfer message can be parsed correctly by C and Java both ends.Because the transfer message structure defines
Basic communications framework, therefore can easily expand in different communication requirements.
The concrete structure of transfer message see the table below, and first 4 wherein in table are the content of message header, and the 5th is message count
According to content.
The structure of table 1, transfer message
| 32bit | 32bit | 32bit | 32bit | Maxlen=512bit |
| msgSrc | msgDst | msgType | msgDataLen | msgData |
Concrete meaning every is described in detail below：
msgSrc：Source message id, that is, send the ID of process；
msgDst：The ID of purpose message id, i.e. receiving process；
msgType：The type of message, this can be according to specific communication requirement specific definitions；
msgDataLen：The length of msgData fields；
msgData：The content of message.
Whole transfer message structure body is transmitted reception using byte stream, in order to carry out message parsing.In considering
Turn the verification scheme of message, message header field can be checked when receiving transfer message, if not meeting what message header defined, will regard
For invalid message, discard processing can be carried out, and continue message and intercept.
The communication of user task is realized using vos platforms message mechanism under C environment.The message mechanism has continued to use linux
The message queue that system provides, application programming interface has been carried out to it（Application Programming
Interface, API）Encapsulation, convenient use.Transmitting-receiving under C environment by the way of one process or dual-thread come completion message,
Parsing and transfer.Each process is individually responsible for sending message and receives message.Can be very using the communication of such half-duplex mode
Convenient tissue code, and it is not likely to produce mistake.The message sink process of C environment is in running states, disappears once listening to
Breath, will put it among linux message queue, system process can enter according to the destination address and type of message of message
Row forwarding.
Message sink and transmission are realized using Unix domain socket under C environment.Unix domain socket only replicates
Data, not responsible protocol processes, it is not necessary to which network head is deleted in addition, therefore, under C code must complete customized agreement solution
Analysis.Message sink flow is as shown in Figure 2 under C environment.When message is sent under C environment, socket is initially set up, is tied to transmission
Socketfile, socket is intercepted, obtain the socket fd of transmission.Because send that message provides for api interface, then just
Connection must be first established, obtains and sends socket descriptors.When past Java in need sends message, the API is just called.
Reference picture 3, the flow for establishing socket are as follows：Create and send socket, bind socket file, monitor
Socket, and socket fd are obtained upon establishment of a connection.Thread is sent in addition after the socket fd sent are obtained, and is preserved
Socket fd, and exit.When msg is sent, the Unix domain socket for calling standard by the socket fd of preservation is sent out
Function send is sent to carry out data transmission.
There are multiple transfer message Bundle under OSGi environment while cooperate, the communication between them to OSGi by noting
Volume messenger service is realized.The framework Felix for establishing OSGi is very simple, it is only necessary to Plug-in engineerings are established in Eclipse,
And the related storehouses of OSGi are imported, Message forwarding module, and all kinds of Java application modules are established respectively.It is not superfluous in detail herein
State.
When task in Java provides the messenger service for sending and receiving message, using following methods：
（1）Registration：The message id of this task is stated, a reception message object example is returned, receives message object and provide
Reading message approach；
（2）Send：It is passed to the example of the subclass of a message class.
Wherein, message class is provided with lower interface：
A. message purpose ID is obtained；
B. message source ID is obtained；
C. type of message is obtained；
D. the byte stream that message data is transmitted on socket is obtained.
Meanwhile message class subclass is additionally provided a group interface, to obtain each data member of this message.
Two connections will be used between transfer message in the present invention in C and Java, are one-way transmission.In order to ensure to imitate
Rate and ensure robustness, use Unix domain（AF_UNIX）Stream connection（SOCK_STREAM）.Java is big end pattern, and C
Pattern it is variant with system difference, therefore it is required that the program of C environment when being transmitted in connection all the time using big end pattern.C rings
Structured data in border is it is possible that the space of alignment.To ensure uniformity, it is desirable to which C environment programs are protected when being transmitted in connection
Gapless between card data.Because having used stream to connect, it is possible that occur multiple messages in buffer area when reading data,
Or the last item it is imperfect situations such as, mechanism as shown in Figure 4 can be used to be handled.Specifically, when buffer area data are grown
When degree is less than message header length and message header length and message data length sum, then message is extracted, and buffer area is remaining
Data move to buffer area head, finally return to information.
C transfer task has two threads, is each responsible for sending a message in Java context, and receives from Java rings
The message sent in border, hereinafter referred to as send thread and receiving thread.Send thread and receive the message from C tasks, after conversion
By sending linkup transmit to Java transfer tasks.If sending connection to be not present, establish and send connection.Receiving thread, which is monitored, to be connected
Request is connect, after establishing connection, reception data is converted into message and sent to C tasks.
Java transfer task is also using as OSGi Bundle.When this Bundle is activated, initialization is sent and connected
Connection is connect and receives, and the service of giving out information.This messenger service includes two methods：
（1）Send message
The mechanism of message approach is sent similar to sending process in C, is to be sent in C after flow data by the message transformation of user
Turn task.The method is called and carried out completely in user thread, may be had multiple user threads while be used, therefore the method quilt
It is defined as synchronous method.
（2）Registration message ID, a reception message object example is returned to, receive message object and provide reading message side
Method.
After user task calls register method, transfer task will produce a message sink object instance, and bind this
The corresponding relation of example and message id, call and read message approach, you can obtain message.
Java transfer task will also produce a receiving thread in activation, for receiving disappearing from C transfer tasks
Breath.If extracting a complete message, a message object example is produced, is disappeared according to corresponding to being found the purpose ID of message
Breath receives object instance, calls its write-in message approach, this message object example is passed into this message sink object instance.
The receiving thread and user task of Java transfer tasks operate same message sink object instance, and wherein message connects
The example of object is received as shown in figure 5, therefore must be introduced into synchronization mechanism.The message write-in and read method for receiving object are all same
One step process, message read method find that current message is space-time, using function wait (), need to call in message writing method
Function notifyall ().
Based on Java and OSGi characteristic, do not recommend to use message interface between Bundle.If in order to which uniformity needs
The message communicating between Bundle is supported, it is necessary to be made an amendment to message transmission interface：Message is obtained according to message purpose ID to connect
The example of object is received, it is successful then past directly to this example write-in message, otherwise it is forwarded to C transfer tasks.
In summary, the implementation method of Java and C communication mechanism is socketed using Unix domain under OSGi environment of the invention
Word, have the high efficiency and security of communication concurrently；The JNI of use framework realization is directly operated using the JUDS storehouses increased income,
So as to eliminate exploitation JNI plenty of time, while communicated again for JAVA with C and provide reliable storehouse support；Utilize what is increased income
Apache Felix can be very good to realize under OSGi framework, the interactive maintenance of each module, be built for C with Java communication environments
Good bridge；The communication protocol of proposition can realize the transmission of variable data, high-volume bytes of stream data, and its high efficiency is derived from
Agreement in itself and and it is uncomplicated, and encode simple.So the present invention effectively overcomes various shortcoming of the prior art and has height
Spend industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (9)
- A kind of 1. implementation method of the communication mechanism of Java modules and C modules under OSGi environment, it is characterised in that：Java modules are transported Row is under OSGi framework, and C modules are run in Linux system, and the implementation method comprises at least：Transfer message Bundle is registered under OSGi environment, Java modules is used messenger service, while C modules can be responded The message sended over；C modules establish communication socket, or Java modules by being initiated to transfer message Bundle with transfer message Bundle Communication request, the socket with C modules is established by transfer message Bundle；C modules by transfer message Bundle receive and dispatch socket message come with Java module communications；Java modules are disappeared by transfer Cease Bundle messenger service and C module communications.
- 2. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：Communicated between transfer message Bundle using Unix domain socket.
- 3. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：Transfer message Bundle includes message header and message data.
- 4. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 3 It is：The message header includes the length of source message id, purpose message id, the type of message and message data.
- 5. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 3 It is：C modules and Java modules can check message header field when receiving transfer message Bundle, determine if not meeting message header Justice, invalid message is will be regarded as, carries out discard processing, and continue message and intercept.
- 6. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：Transfer message Bundle is transmitted reception using byte stream.
- 7. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：The transfer task of C modules includes sending thread and receiving thread, is each responsible for sending a message in Java modules, with And receive the message sent from Java modules.
- 8. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：Transfer message Bundle of the transfer task of Java modules as an OSGi；When the transfer message Bundle is activated When, initialization is sent into connection and receives connection, and the service of giving out information.
- 9. the implementation method of the communication mechanism of Java modules and C modules, its feature under OSGi environment according to claim 1 It is：The receiving thread and user task of Java module transfer tasks operate same message sink object instance；Receive object Message write-in and read all be synchronous method.
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| CN103995751B (en) * | 2014-05-30 | 2019-06-07 | 上海斐讯数据通信技术有限公司 | A kind of Overpassing Platform by Using system and method |
| CN105279033B (en) * | 2014-07-22 | 2019-04-16 | Tcl集团股份有限公司 | The method and system of C++ and Java communication under Android platform |
| CN104317661A (en) * | 2014-11-04 | 2015-01-28 | 上海斐讯数据通信技术有限公司 | Intersystem communication method and device of dual embedded systems |
| CN105204848B (en) * | 2015-08-27 | 2018-08-14 | 深圳创维－Rgb电子有限公司 | Function solidification is carried out using binary program and the method and system of service are provided |
| CN105450731A (en) * | 2015-11-05 | 2016-03-30 | 珠海多玩信息技术有限公司 | Method and apparatus for realizing communication between web layer and native layer |
| CN107239350B (en) * | 2016-03-28 | 2020-07-07 | 中国电信股份有限公司 | Method and system for calling gateway capability |
| CN105955829A (en) * | 2016-04-20 | 2016-09-21 | 青岛海信宽带多媒体技术有限公司 | Order processing method, device and terminal |
| CN109901826B (en) * | 2019-03-01 | 2022-06-10 | 上海极威信息科技有限公司 | Data processing method and device for Java program and electronic equipment |
| CN113377461A (en) * | 2021-07-04 | 2021-09-10 | 芯河半导体科技(无锡)有限公司 | Mode for realizing management operation on OSGi plug-in through C program |
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