CN103645940A - Remote calling method and system - Google Patents
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Abstract
The invention provides a remote calling method. The remote calling method comprises the following steps that a client-side sends requests for calling remote methods and obtaining return values to a server side; the server side receives the requests and establishes a plurality of threads so as to execute the called remote methods, wherein in the executing process of the called remote methods, any thread in the threads is allowed to return a part of the return values through a part of return interfaces and the returning times are not limited; after all the return values are returned, the server side sends a calling end notice to the client-side. According to the remote calling method, any thread is allowed to return a part of the return values through a part of return interfaces and the returning times are not limited, the average data return time is shortened, distributed system interlayer data aggregation is quickened, data generation and data transmission are made to run in a staggered mode, and the responding time of a whole system is shortened. The invention further provides a remote calling system.
Description
Technical field
The present invention relates to distributed computing technology and system field, relate in particular to a kind of remote invocation method and system.
Background technology
At present, build large-scale distributed system abstract by " layer " conventionally: " layer " may be " layer " in multi-layer framework, also may be an assembly in component system, or a service in Service-Oriented Architecture Based (Service-Oriented Architecture, SOA).In this framework, system is divided into a plurality of " layers ", and needs defining interface to carry out alternately between each " layer ".At system with in realizing, this interlayer interactive mode of far call (Remote Calling) is more irreplaceable.Conventionally the far call technology adopting has: traditional remote procedure call (Remote Procedure Call, RPC), the remote method invocation (RMI) of Java language (Remote Method Invocation, RMI), .NET remote technology (.NET Remoting), and Thrift technology.
Meanwhile, data gathering (Data Aggregation) becomes typical pattern of traffic in current distributed system.For example, generally " shuffle " stage of the MapReduce of application, any one reducer can ask for to all mapper the intermediate data of own corresponding part.This cutting apart-assemble the basis that Design Mode has become a lot of large-scale distributed application, such as Webpage search, social network content combination etc.Yet, when data gathering runs into multi-layer framework, the server of traditional far call can only be after the slowest data acquisition the unified client that returns to, average response time that like this can obvious increase system.Although the mechanism of some optimizing data streams has contained the optimization to data stream, these mechanism depend on specific programming framework, lack general applicability.And they conflict with traditional " layer " abstract easy generation.If adopt this kind of system, need Perfect Reconstruction, bring problems.Asynchronous remote calls can alleviate the wait of caller to slow data, but some does not support rreturn value, and some only allows client to obtain rreturn value by accessing specific object.
Work on hand cannot meet the demand of distributed system to the processing of the problems referred to above, i.e. the multithreading of back-level server end and distributed programmed environment well.
Summary of the invention
The present invention is intended at least one of solve the problems of the technologies described above.
For this reason, first object of the present invention is to propose a kind of remote invocation method.The method can be accelerated the interlayer data gathering of distributed system, by the generation of data and transmission interleaving operation, has shortened the response time of whole system.
Second object of the present invention is to propose a kind of far call system.
To achieve these goals, the remote invocation method of first aspect present invention embodiment comprises the following steps: user end to server end sends the request of calling remote method and obtaining rreturn value; Described server end receives described request, and create a plurality of threads to carry out invoked described remote method, wherein, in the implementation of described invoked remote method, allow any thread in described a plurality of thread to return to interface time ground returning part target data arbitrarily by part; And after described target data is all returned, described server end sends and calls end notification to described client.
According to the remote invocation method of the embodiment of the present invention, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part, reduced data average turnaround times, accelerated the data gathering of distributed system interlayer, prevent that slow data tie down other data, strengthen the streamline of subsequent treatment, by the generation of data and transmission interleaving operation, shortened the response time of whole system.
In some instances, for invoked remote method described in each is given the integer that an initial value is 0 reference count, it supports following two atomic operation: P operation to subtract one to described reference count; V operation adds one to described reference count.
Further, in some instances, described P operation of each some binding, a described V operation of each limit binding, wherein, puts as carrying out the related thread of described invoked remote method, and limit is the derived relation of another thread of thread creation.
In some instances, the described invoked remote method of described execution and described transmission are called end notification and are completed by partial order agreement, described partial order agreement specifically comprises: when another thread of thread creation, be performed with the described V operation of corresponding described limit binding; When a thread finishes, be performed with the described P operation of described some binding; Call end notification and occur after all described V operation of root binding, wherein, root is the thread at described invoked remote method place; Call end notification and become 0 rear generation in described reference count.
In some instances, also comprise: described client is obtained part or all of described rreturn value after described remote service is called.
The far call system of second aspect present invention embodiment, comprising: client, for sending and call the request of remote method to server end, and inquire about the rreturn value that described server end returns; Server end, the call request sending for receiving described client, carries out invoked remote method, and sends rreturn value and call end notification to described client.
According to the far call system of the embodiment of the present invention, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part, reduced data average turnaround times, accelerated the data gathering of distributed system interlayer, prevent that slow data tie down other data, strengthen the streamline of subsequent treatment, by the generation of data and transmission interleaving operation, shortened the response time of whole system.
In some instances, for invoked remote method described in each is given the integer that an initial value is 0 reference count, it supports following two atomic operation: P operation to subtract one to described reference count; V operation adds one to described reference count.
Further, in some instances, described P operation of each some binding, a described V operation of each limit binding, wherein, puts as carrying out the related thread of described invoked remote method, and limit is the derived relation of another thread of thread creation.
In some instances, described server end returns to interface by part and sends described rreturn value and call end notification to client.The described invoked remote method of described execution and described transmission are called end notification and are completed by partial order agreement, and described partial order agreement specifically comprises: when another thread of thread creation, be performed with the described V operation of corresponding described limit binding; When a thread finishes, be performed with the described P operation of described some binding; Call end notification and occur after all described V operation of root binding, wherein, root is the thread at described invoked remote method place; Call end notification and become 0 rear generation in described reference count.
In some instances, also comprise: described client is obtained part or all of described rreturn value after described remote service is called.
The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein,
Fig. 1 is the process flow diagram of remote invocation method according to an embodiment of the invention;
Fig. 2 is the Java example code figure of the server end operation of one embodiment of the invention;
Fig. 3 is one embodiment of the invention and the traditional client of far call and the mutual contrast schematic diagram of server;
Fig. 4 is the partial order agreement schematic diagram according to the embodiment of the present invention;
Fig. 5 is the Java example code figure of the client operation of one embodiment of the invention;
Fig. 6 is the simulation result figure that the remote invocation method of one embodiment of the invention is applied to cloud storage system Corsair; With
Fig. 7 is the structured flowchart of far call system according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.On the contrary, embodiments of the invention comprise spirit and all changes within the scope of intension, modification and the equivalent that falls into additional claims.
In description of the invention, it will be appreciated that, term " first ", " second " etc. are only for describing object, and can not be interpreted as indication or hint relative importance.In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connects integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary.For the ordinary skill in the art, can understand as the case may be above-mentioned term concrete meaning in the present invention.In addition,, in description of the invention, except as otherwise noted, the implication of " a plurality of " is two or more.
In process flow diagram or any process of otherwise describing at this or method describe and can be understood to, represent to comprise that one or more is for realizing module, fragment or the part of code of executable instruction of the step of specific logical function or process, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function and carry out function by the mode of basic while or by contrary order, this should be understood by embodiments of the invention person of ordinary skill in the field.
Below with reference to accompanying drawing, describe according to the remote invocation method of the embodiment of the present invention and system.
In the embodiment of first aspect present invention, proposed a kind of remote invocation method, comprised the following steps: user end to server end has sent the request of calling remote method and obtaining rreturn value; Server end receives request, and creates a plurality of threads to carry out invoked remote method, wherein, in the implementation of invoked remote method, allows any thread in a plurality of threads to pass through remote interface time ground returning part rreturn value arbitrarily; After rreturn value is all returned, server end sends and calls end notification to client.
Fig. 1 is the process flow diagram of remote invocation method according to an embodiment of the invention.In conjunction with Fig. 1 in detail, the implementation procedure of remote invocation method of the present invention is described in detail:
Step S101: user end to server end sends the request of calling remote method and obtaining rreturn value.
Step S102: server end receives request, and create a plurality of threads to carry out invoked remote method, wherein, in the implementation of invoked remote method, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part.
Particularly, in conjunction with the Java example code explanation implementation procedure of the server end operation of the one embodiment of the invention of Fig. 2:
Server end, after receiving request, has created some worker threads (the 3rd row of code sample), carries out invoked remote method.Each thread is by preturn(partial return) partial results is returned to the caller of client.In code sample, the preturn of three diverse locations has shown its dirigibility, can be used for any thread returning part rreturn value in multiple times arbitrarily.Fig. 3 is one embodiment of the invention and the traditional client of far call and the mutual contrast schematic diagram of server, and the invoked procedure of the embodiment of the present invention can be described intuitively in conjunction with Fig. 3.Wherein, be (a) and (c) traditional far call schematic diagram, can only disposablely return results; (b) be and (d) remote invocation method schematic diagram of the present invention, server end does not need to wait for that each worker thread all finishes, and partial results can be returned to client in batches.
In addition, function preturn is that a predefined part of server end is returned to interface, and preturn does not need to configure other parameters except receiving rreturn value.In the inner meeting of preturn, create a responder thread, transmit real data.The thread at invoked method place and responder thread all can record unique ID that calls, and will call ID and target data serializing together, as rreturn value, return to client.
Further, one embodiment of the present of invention are given the integer that an initial value is 0 reference count for each invoked remote method pellucidly to programmer, and it supports following two atomic operation: P operation to subtract one to reference count; V operation adds one to reference count.
In service in reality, carries out invoked remote method and transmission and calls end notification and complete by partial order agreement.Partial order agreement specifically comprises:
When another thread of thread creation, be performed with the V operation of corresponding limit binding, wherein, limit is the derived relation of a thread creation another one thread;
When a thread finishes, be performed with the P operation of a binding, wherein, put as the related thread of invoked remote method, especially, call end notification also as a special thread, thus an also corresponding point;
Call end notification and occur after all V operations of root binding, wherein, root is the thread at invoked remote method place;
Call end notification and become 0 rear generation in reference count.
For example, in one embodiment of the invention, partial order protocols abstract ground is applied a static digraph and is represented, as shown in Figure 4, P and V operation are bound with point and limit respectively, and the numeral in bracket has been distinguished different operations." s " point is the thread at called method place, also referred to as root; " v " point represents to call end notification.In real work, server end guarantees that worker thread, according to operation corresponding to digraph as shown in Figure 4, carries out as above partial order agreement.
Step S103: after rreturn value is all returned, server end sends and calls end notification to client.
Especially, in an embodiment of the present invention, client can be obtained part or all of rreturn value after remote method is called.Fig. 5 is the Java example code of the client operation of one embodiment of the invention, code in conjunction with example in Fig. 5, client is by the remote method (code the 1st row) of invoke () invoking server end, the set of the rreturn value of obtaining is stored in ReplySet object, the hasMore () method of ReplySet object may hang up to wait for next part rreturn value (code the 3rd row), until call end notification, arrive, the isPartial () method of ReplySet object shows whether current results has comprised the rreturn value of all expections.Finally, the caller of client can obtain part or all of rreturn value (code the 5th row) by enumerating interface as required.
Below by the application example of two remote invocation methods of the present invention, verify the superiority of method of the present invention.
Fig. 6 is the simulation result figure that the remote invocation method of one embodiment of the invention is applied to cloud storage system Corsair.Method of the present invention is applied to cloud storage system Corsair, 10 points (Virginia, The United States state, California, U.S. north, Japan, Singapore, Ireland, Britain etc.) that are deployed in the distribution whole world such as Amazon EC2, GoGrid, Rackspace, the data gathering that the user of operation acquisition thereon organizes address list operates.Based on data of the present invention average turnaround times than traditional far call decreased average 55.7%(mxm. 61.0%, minimum 49.5%).We,, except testing normal execution (Normal), have also added failed point (Failure) artificially, and in Failure test, A4 point is closed down.Now the data average arrival time of the embodiment of the present invention on average only has the 6.6%(mxm. 9.4% of traditional remote invocation method, minimum 5.1%).In figure: AAT represents data average arrival time, Normal std refers to the far call of arm's length standard, Normal mr refers to the far call repeatedly returning under normal circumstances, Failure std refers to the far call of the standard of failed point, and Failure mr indicates the far call repeatedly returning of failed point.
According to the remote invocation method of the embodiment of the present invention, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part, reduced data average turnaround times, accelerated the data gathering of distributed system interlayer, prevent that slow data tie down other data, strengthen the streamline of subsequent treatment, by the generation of data and transmission interleaving operation, shortened the response time of whole system.
In the embodiment of second aspect present invention, proposed a kind of far call system, in conjunction with Fig. 7, having comprised: client 100 and server end 200.
Wherein, client 100 is for sending and to call the request of remote method to server end, and obtains the rreturn value that server end returns.The call request that server end 200 sends for receiving client, carries out invoked remote method, and sends rreturn value and call end notification to client.
Particularly, client 100 sends and calls remote method and obtain after the request of rreturn value to server end, server end 200 receives request, and create a plurality of threads to carry out invoked remote method, wherein, in the implementation of invoked remote method, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part.Concrete implementation procedure is as follows:
In conjunction with the Java example code figure of server end 200 operations of the one embodiment of the invention of Fig. 2, server end 200, after receiving request, has created some worker threads (the 3rd row of code sample), carries out invoked remote method.Each thread is by preturn(partial return) partial results is returned to the caller of client 100.In code sample, the preturn of three diverse locations has shown its dirigibility, can be used for any thread returning part rreturn value in multiple times arbitrarily.Fig. 3 is one embodiment of the invention and the traditional client of far call and the mutual contrast schematic diagram of server, and the invoked procedure of the embodiment of the present invention can be described intuitively in conjunction with Fig. 3.Wherein, be (a) and (c) traditional far call schematic diagram, can only return results once.(b) be and (d) remote invocation method schematic diagram of the present invention, server end does not need to wait for that each worker thread all finishes, and partial results can be returned to client in batches.
In addition, function preturn is that a predefined part of server end 200 is returned to interface, and preturn does not need to configure other parameters except receiving rreturn value.In the inner meeting of preturn, create a responder thread, transmit real data.The thread at invoked method place and responder thread all can record unique ID that calls, and will call ID and target data serializing together, as rreturn value, return to client 100.
Further, one embodiment of the present of invention are given the integer that an initial value is 0 reference count for each invoked remote method pellucidly to programmer, and it supports following two atomic operation: P operation to subtract one to reference count; V operation adds one to reference count.
In service in reality, carries out invoked remote method and transmission and calls end notification and complete by partial order agreement.Partial order agreement specifically comprises:
When another thread of thread creation, be performed with the V operation of corresponding limit binding, wherein, limit is the derived relation of a thread creation another one thread;
When a thread finishes, be performed with the P operation of a binding, wherein, put as the related thread of invoked remote method, especially, call end notification also as a special thread, thus an also corresponding point;
Call end notification and occur after all V operations of root binding, wherein, root is the thread at invoked remote method place;
Call end notification and become 0 rear generation in reference count.
For example, in one embodiment of the invention, partial order protocols abstract ground is applied a static digraph and is represented, as shown in Figure 4, P and V operation are bound with point and limit respectively, and the numeral in bracket has been distinguished different operations." s " point is the thread at called method place, also referred to as root." v " point represents to call end notification.In real work, server end guarantees that worker thread, according to operation corresponding to digraph as shown in Figure 4, carries out as above partial order agreement.
After rreturn value is all returned, server end 200 sends and calls end notification to client 100.
Especially, in an embodiment of the present invention, client 100 can be obtained part or all of rreturn value after remote method is called.Fig. 5 is the Java example code of the client operation of one embodiment of the invention, code in conjunction with example in Fig. 5, client 100 is by the remote method (code the 1st row) of invoke () invoking server end 200, the set of the rreturn value of obtaining is stored in ReplySet object, the hasMore () method of ReplySet object may hang up to wait for next part rreturn value (code the 3rd row), until call end notification, arrive, the isPartial () method of ReplySet object shows whether current results has comprised the rreturn value of all expections.Finally, the caller of client 100 can obtain part or all of rreturn value (code the 5th row) by enumerating interface as required.
According to the far call system of the embodiment of the present invention, allow any thread in a plurality of threads to return to interface time ground returning part rreturn value arbitrarily by part, reduced data average turnaround times, accelerated the data gathering of distributed system interlayer, prevent that slow data tie down other data, strengthen the streamline of subsequent treatment, by the generation of data and transmission interleaving operation, shortened the response time of whole system.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a remote invocation method, is characterized in that, comprises the following steps:
User end to server end sends the request of calling remote method and obtaining rreturn value;
Described server end receives described request, and create a plurality of threads to carry out invoked described remote method, wherein, in the implementation of described invoked remote method, allow any thread in described a plurality of thread to return to interface time ground returning part rreturn value arbitrarily by part; And
After described rreturn value is all returned, described server end sends and calls end notification to described client.
2. the method for claim 1, is characterized in that, also comprises:
For invoked remote method described in each is given the integer that an initial value is 0 reference count, it supports following two atomic operations:
P operation subtracts one to described reference count;
V operation adds one to described reference count.
3. method as claimed in claim 2, is characterized in that, described P operation of each some binding, a described V operation of each limit binding, wherein, put as carrying out the related thread of described invoked remote method, limit is the derived relation of another thread of thread creation.
4. the method as described in claim 1 any one, is characterized in that, the described invoked remote method of described execution and described transmission are called end notification and completed by partial order agreement, and described partial order agreement specifically comprises:
When another thread of thread creation, be performed with the described V operation of corresponding described limit binding;
When a thread finishes, be performed with the described P operation of described some binding;
Call end notification and occur after all described V operation of root binding, wherein, root is the thread at described invoked remote method place;
Call end notification and become 0 rear generation in described reference count.
5. the method for claim 1, is characterized in that, also comprises: described client can be obtained part or all of described rreturn value after described remote method is called.
6. a far call system, is characterized in that, comprising:
Client, for sending and call the request of remote method to server end, and obtains the rreturn value that described server end returns;
Server end, the call request sending for receiving described client, carries out invoked remote method, and sends rreturn value and call end notification to described client.
7. system as claimed in claim 6, is characterized in that, for invoked remote method described in each is given the integer that an initial value is 0 reference count, it supports following two atomic operations:
P operation subtracts one to described reference count;
V operation adds one to described reference count.
8. system as claimed in claim 7, is characterized in that, described P operation of each some binding, a described V operation of each limit binding, wherein, put as carrying out the related thread of described invoked remote method, limit is the derived relation of another thread of thread creation.
9. system as claimed in claim 6, it is characterized in that, described server end returns to interface by part and sends described rreturn value and call end notification to client, the described invoked remote method of described execution and described transmission are called end notification and are completed by partial order agreement, and described partial order agreement specifically comprises:
When another thread of thread creation, be performed with the described V operation of corresponding described limit binding;
When a thread finishes, be performed with the described P operation of described some binding;
Call end notification and occur after all described V operation of root binding, wherein, root is the thread at described invoked remote method place;
Call end notification and become 0 rear generation in described reference count.
10. system as claimed in claim 6, is characterized in that, also comprises: described client can be obtained part or all of described rreturn value after described remote method is called.
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Application publication date: 20140319 |