CN101388898B - Architecture of peer-to-peer network platform - Google Patents
Architecture of peer-to-peer network platform Download PDFInfo
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Abstract
The invention provides a peer-to-peer network platform construction, which comprises: a communication layer positioned on the bottom of the peer-to-peer network platform construction for transmitting messages with the peer through a physical network or a simulator and communicating with the overlap network layer through a network abstract application programming interface; an overlap network layer positioned on the communication layer while below the service layer for realizing the peer-to-peer network routing function, communicating with the service layer through the general programming interface, and transmitting messages between the communication layer and the service layer; and a service layer positioned on the overlap network layer for providing service to the application of the client-end. The construction in the invention supports overlap network layer simulator and network layer simulator, can supports simulation in two layers, and can screen the difference between the simulation and the actual motion by the abstract interface, consequently, can be used to testing the platform, service and application independently.
Description
Technical field
The present invention relates to network communication field, relate in particular to the framework of a kind of P2P (peer-to-peer, equity) network platform.
Background technology
Recently the P2P network is because of its characteristic conforms epoch demand, and itself can be rated as the model that P2P calculates again, more and more paid attention to, and the P2P network technology will be penetrated in many fields.In the P2P network technology, how correctly carrying out route or inquiry under various disturbed conditions is a key issue.
In the P2P network technology, " node capacity " of each peer-to-peer (Peer) often has diversity, and this diversity shows aspects such as CPU speed, available bandwidth, memory space.The scale of P2P network to be increased to maximum, just must consider the problem of these " node capacity " diversities.
The agreement that the P2P middleware framework of some non-open types all uses each producer to control oneself and define usually, incompatible between framework and the framework, each P2P network has formed the community of a sealing, fully with other P2P Network Isolation, thereby reduced the advantage of P2P network on the use devices from different manufacturers.Can not effectively control business.
Project JXTA (the juxtapose of community increases income, think that P2P can be a kind of computation schema arranged side by side with the client-server mode) platform definition the open standard agreement of one cover, the JXTA platform adopts unique routing algorithm, can be used as the general-purpose platform that the various decentralized networks of exploitation are used.
The JXTA platform is classified to each peer-to-peer according to the role.Various peer-to-peers are divided into: edge peer-to-peer (general peer-to-peer), Rendezvous Point super-peer (route with) and relaying peer-to-peer (be used for fire compartment wall and NAT crosses).
The JXTA platform has adopted a kind of loose coupling destructuring network, and its method for routing is called Rendezvous Point pedestrian technology, and the implementation procedure of this method for routing comprises the steps:
(A, B) keyed advertising of all inciting somebody to action separately is registered to different Rendezvous Point super-peer (Rdv1, Rdv2) respectively for step 1, general peer-to-peer.
Step 2, peer-to-peer A issue a request and inquire about an advertisement that is kept on the peer-to-peer B, this request are sent to the Rendezvous Point Rdv1 (1) of peer-to-peer A.
Step 3, Rdv1 check whether it has the index of above-mentioned advertisement.If no, communicate that request to next Rendezvous Point Rdv2.
After step 4, Rdv2 receive this request, find the index of above-mentioned advertisement and this request is transmitted to peer-to-peer B.
In realizing process of the present invention, the inventor finds that above-mentioned JXTA platform carries out node-classification according to the role, but in JXTA, do not obtain regulation but how the role divides, most of the Internets all are made up of the multiple peer-to-peer with different disposal ability (as available bandwidth), storage capacity and Session Time ability, ideally should divide the role, but the JXTA platform is not considered to this according to these different abilities.
The JXTA platform also has following shortcoming aspect the P2P route:
1, it is too low to utilize pedestrian's technology to search for success rate.
2, the edge peer-to-peer will just can carry out route by the super-peer of contact Rendezvous Point.Therefore, all routes are all undertaken by one group of Rendezvous Point peer-to-peer, but do not consider the overload factor between these Rendezvous Point peer-to-peers.
3, the distribution of the peer-to-peer below each Rendezvous Point super-peer is unclear.
4, the route entry of Rendezvous Point super-peer exchange also is special, has caused all irreparable in many cases bandwidth waste.
5, clearly regulation compile maintaining method between peer-to-peer and the edge peer-to-peer, having peer-to-peer when netting, may cause very high mortality.
6, the search jumping figure is uncertain.
7, the JXTA platform does not have built-in simulator.
8, can't replace the method for routing of JXTA.
Omnix is a kind of open lightweight middleware platform, and Omnix itself mainly is a kind of system architecture, but it also is a kind of realization simultaneously.Compare with the JXTA platform, it is much thin that the realization of Omnix platform is wanted, and allow the application programming personnel to replace each layer of system.
In realizing process of the present invention, what the inventor found above-mentioned Omnix platform concern mainly is system architecture, the same with the JXTA platform, does not consider the difference of the ability of actual fully various peer-to-peers.Aspect the P2P route, do not carry out technological improvement.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of framework of P2P platform, can simulate various application by network simulator.
The objective of the invention is to be achieved through the following technical solutions:
A kind of framework of peer-to-peer network platform comprises:
Communication layers is positioned at the bottom of the framework of peer-to-peer network platform, by message transfer between physical network or simulator and the peer-to-peer, communicates by abstract API of network and stack stratum reticulare;
The stack stratum reticulare is positioned on the communication layers, under the service layer, realizes the routing function of peer-to-peer network, communicates message transfer between communication layers and service layer by universal programming interface and service layer;
Service layer is positioned on the stack stratum reticulare, provides service to the application of user terminal;
Described communication layers specifically comprises:
The transmission sublayer is used for message transfer between host-host protocol by reality and the peer-to-peer, and the host-host protocol by reality provides network abstract API to the stack stratum reticulare;
The analogue transmission layer is used for realizing emulation transmission sublayer by carrying out interaction with network topology simulation maker, by message transfer between this emulation transmission sublayer and the peer-to-peer, provides network abstract API by this emulation transmission sublayer to the stack stratum reticulare.
The technical scheme that provides by the invention described above embodiment as can be seen, the embodiment of the invention is provided with the superposed simulation device at the stack stratum reticulare, thereby can be used for independently platform, business and application being tested by the analogue transmission sublayer is set in communication layers.
It is replaceable to realize module to have clearly API (API) between the interior laminate layer of the framework of the described P2P platform of the embodiment of the invention.
Description of drawings
Fig. 1 is the structural representation of the framework of the described P2P platform of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of framework of P2P platform.This framework is a kind of delamination modularization network configuration, and the structural representation of the embodiment of this framework as shown in Figure 1.
In the framework of the P2P platform that the embodiment of the invention proposes, the developer can divide two-layer developing: can create and test new P2P algorithm network routing based on Netabs API (the abstract DLL (dynamic link library) of network); Perhaps, create and test new business based on Common API (universal programming interface) based on the P2P network.
The framework of the P2P platform that the embodiment of the invention proposes can impel simulation code to carry out the transition to the pilot code of interconnected online operation smoothly.The details that this framework provides Netabs API to encapsulate network service, the feasible code of writing based on Netabs API just need not be revised and both can move on the real network test envelope, also only dry run under simulated environment.In addition, providing Common API on the overlay network course, for the service code on upper strata, is to operate on the simulator or real network so on earth, is fully transparent.
As shown in Figure 1, the framework of the P2P platform of embodiment of the invention proposition mainly is made up of communication layers, stack stratum reticulare, service layer and four parts of application layer.
Introduce the function of these four layers below respectively.
One, communication layers.
Communication layers is positioned at the bottom of the framework of the P2P platform that the embodiment of the invention proposes, main be responsible for message actual between the peer-to-peer and send and receive, and this message is sent and receives is by the detailed process that actual physics network or simulator carry out the upper strata to be shielded.
Comprise two kinds of realizations in the communication layers:
The transmission sublayer: the transmission sublayer realizes providing the communication layers interface by actual TCP (Transfer Control Protocol, transmission control protocol) and UDP transition layer protocols such as (User Datagram Protocol, User Datagram Protoco (UDP)) to the upper strata.
The analogue transmission sublayer: the interaction of utilization of analogue transmission sublayer and network topology simulation maker provides an artificial network environment, and provides the communication layers interface to the upper strata equally.
Network topology simulation maker (such as NS-2, BRITE-NS) can generate various artificial network topological structures, as simple autonomous territory, ring topology and hierarchical topology etc., and can give different bandwidth and delay parameter to each the bar link in the topology.
The communication protocol (such as UDP, TCP) that realize the analogue transmission sublayer and have any different by the actual version that network interface card sends, receives, this communication protocol is actually the realization of analog version, can simulate the analog network situation that maker produces according to network topology, analog computation goes out an information and is transferred to from a node that another node is needed to be delayed.
If the framework of this middleware P2P platform is selected with the analog form operation, then communication layers is used the analogue transmission sublayer, if select with the real network mode operation, then communication layers is used the transmission sublayer.It is transparent for the stack stratum reticulare that communication layers is used any in analogue transmission sublayer or the transmission sublayer.
Under the ruuning situation of analog form, for each overlay network node of simulating out, the communication layers network node of a corresponding simulating is arranged all, communication layers is safeguarded for the mapping relations between this two category node.
It is NetabsAPI that communication layers provides the abstract API of network to upper strata (stratum reticulare promptly superposes), and it comprises three major parts:
1, for the abstract message encapsulation of network, provide the abstract generic definition of content, source end and destination about the message that will send, this abstract generic definition comprises type, message body, source end identifier and destination identifier.
2, the package interface of communication layers major function, each realization (as transport layer or analogue transmission layer) all must realize this interface, this interface comprises: sending method (with the abstract message of network as input parameter), and received the callback interface after the message (equally with the abstract message of network as parameter), and for sender and recipient's registering functional.
3, abstract synchronous receiving interface, this synchronous receiving interface comprise always to be waited for and the await a response function of message of limiting time.
Two, stack stratum reticulare.The stack stratum reticulare is positioned on the communication layers, under the service layer, the stack stratum reticulare comprises: overlay network simulator and stack sublayer.
1, superimposed layer simulator layer.
Overlay network simulator layer is integrated with the overlay network simulator, can simulate whole overlay network, the peer-to-peer network that simulation is actual.Simulate the life cycle of actual node by the method for calling analog node (realizing analog node interface SimNode), also can obtain routing iinformation, with dispatch messages in analog network by the method for calling analog node.
When the framework of the described middleware P2P of embodiment of the invention platform moved with " only simulating the overlay network mode ", overlay network simulator layer in fact directly called the method for all the other analog node in this analog network; When above-mentioned framework moved with " analog network mode ", the communication of each node that simulated was called analogue transmission layer, network topology simulation maker by Netabs and is finished; And when above-mentioned framework moved with " actual motion pattern ", communication was carried out on the network of reality.
For the stack stratum reticulare, overlay network simulator layer provides the information of whole analog network.It is responsible for realizing following function:
1, creates node;
2, move each node process;
3, receive or send out message between node down " only simulating the overlay network mode ";
4, make node failure.
Above-mentioned functions realizes by analog node interface (SimNode API).Each analog node all provides the realization of these interfaces to support dry run and to collect various statistic.Agreement at the stack online operation can only create/link management and carry out Route Selection.Simulator provides various statistic to use for assessment.
Each analog node realizes SimNode API, and overlay network simulator layer is realized copying by calling this interface, this copying mainly comprise following some:
The identifier of 1, setting, access node and all the other states;
2, send, receive data;
3, add, withdraw from overlay network and make node failure;
4, be provided with, move the simulation timer
5, drive the handling procedure of analog node
6, obtain transmission, the reception message queue of node, node state
The overlay network simulator also provides some extension points, defines following content for secondary development person and replaces original realization:
1, node adds/leaves strategy;
2, query strategy;
3, new statistical report.
All the other modules are used overlay network simulator layer by simulator interface (Simulator API), and this Simulator API comprises following function:
1, for the abstract message encapsulation of network, provide the abstract generic definition of content, source end and destination about the message that will send, comprise type, message body, source end identifier and destination identifier.
2, the package interface of communication layers major function, each realization (as transport layer or analogue transmission layer) all must realize this interface, comprise: sending method (with the abstract message of network as input parameter), and received the callback interface after the message (equally with the abstract message of network as parameter), and for sender and recipient's registering functional.
3, abstract synchronous receiving interface comprises always and to wait for and the await a response function of message of limiting time.
2, stack sublayer.
The effect of stack sublayer is the basic function that realizes peer-to-peer network, and provides a public DLL (dynamic link library) (Common API) to service layer.Communication between stack sublayer and the service layer/network layer all is two-way.With the communicating by letter of service layer in, notification service layer after the message of communication layers is received in the stack sublayer, promptly carries out exhaling on the message; And service layer can also come to communication layers request service layer's route messages or obtain routing state information by Common API, promptly carries out exhaling under the message.
There are three important modules the stack sublayer:
1, ID administration module: this module guarantees that node ID can evenly distribute, to help finishing load balancing.
2, Routing Protocol module: this module mainly is responsible for the P2P route.The improvement of the embodiment of the invention is to utilize diversity to increase disturbance rejection, and it is as follows to improve one's methods:
Calculate diversity coefficient HF according to node capacity, computational methods are as follows:
Wherein B is the network bandwidth, and T is the uptime of a peer-to-peer in the network, and C is a cpu performance, and M is a memory size, and S is a memory span, and then the HF of this peer-to-peer is B, T, and C, the function of M and S, then:
HF＝func(B，T，C，M，S)
B wherein, T and important for the influence of disturbance rejection, therefore get in Practical Calculation:
HF＝func(B，T)＝(BW_WEIGHTAGE_FACTOR*nodebandwidth)+(PREVIOUS_UPTIME_WEIGHTAGE_FACTOR*nodeprevious_Uptime)+
(CURRENT_UPTIME_WEIGHTAGE_FACTOR*node?currentUptime)
In the aforementioned calculation formula, each weight factor all can be self-defined, determines according to network operation situation.BW_WEIGHTAGE_FACTOR is the node bandwidth weight factor, and node bandwidth is a node bandwidth; PREVIOUS_UPTIME_WEIGHTAGE_FACTOR is the weight factor of node uptime last time, and node previous Uptime is node uptime last time; CURRENT_UPTIME_WEIGHTAGE_FACTOR is the weight factor of this uptime of node, and node current uptime is this uptime of node.
In embodiments of the present invention, determine the size of routing table according to node capacity, the bigger routing table of node maintenance of ability strong (more stable, bigger bandwidth), and be responsible for renewal in these routing tables.Improve query success rate and accuracy by parallel query.
3, load balancing engine modules: in node load heavier (it is elongated to show as message queue to be sent, that reception is pending), notify all the other node load sharings, and adjust the diversity parameter of oneself, dwindle routing table.
The universal programming interface (CommonAPI) of stack stratum reticulare consists of the following components:
1, this node initiates to transmit a message to the pairing peer-to-peer of certain keyword;
2, receive the message of all the other nodes,, see that then the message that receives continues to transmit if self be not the pairing peer-to-peer of this keyword, and the notice top service; Otherwise the notice top service, the transport process of the message that termination receives;
3, in local cache, search the pairing peer-to-peer of certain keyword (perhaps certain scope of keyword), search which peer-to-peer and can be used as next jumping of forwards, to after these peer-to-peers, can find the pairing peer-to-peer of this keyword more easily to forwards;
4, obtain neighbours' peer information.
Three, service layer.
Service layer is also referred to as reciprocity service layer, creates on the stack stratum reticulare by the standard universal DLL (dynamic link library), is between terminal applies layer and the stack stratum reticulare.It provides and can supply the reusable top service of various application, as: distributed hashtable (DHT), non-centralized object location and route (DOLR) and group's clean culture/multicast (CAST) etc. make upper layer application needn't pay close attention to the concrete labyrinth of P2P again.
The interface that DHT provided comprises: register button, data; Obtain the data of original registration according to certain key; Delete the pairing data of certain key;
The interface that DOLR provided comprises: issue or cancel issue with certain object identifier; Send message to certain object identifier, all peer-to-peers of issuing (also not cancelling) this object identifier all can be received this message like this, also can limit the number of the peer-to-peer that can receive this message;
The interface that CAST provided comprises: be that parameter adds certain group with the group identifier; With the group identifier is that parameter withdraws from certain group; In certain group, broadcast
Four, application layer.
Application layer is positioned at the top layer of the framework of the described P2P platform of the embodiment of the invention, refers to the various concrete application program that the user develops based on service layer.
Application layer is made up of the terminal applies (as VoD, CFS, PAST, Scribe etc.) that is based upon on the P2P function basis that lower two layers provides.Most of application layers have all been used one or more abstraction interfaces of operation layer.
In sum, it is replaceable to realize module to have clearly API between the middleware inside of frame layering of the described P2P platform of the embodiment of the invention, can support the user on different levels, to carry out secondary development, be particularly suitable for this still development requirement of the technology in fast development of P2P.
The middleware framework of the described P2P platform of the embodiment of the invention utilizes diversity to improve the ability of system's disturbance rejection, and diversity index is determined according to node capacity.The stability and the reliability of P2P middleware platform have been improved;
Inherent stack stratum reticulare simulator and the network layer simulator supported of the middleware framework of the described P2P platform of the embodiment of the invention can be supported the emulation of two aspects, and shield the difference of emulation and actual motion by abstraction interface.Thereby can be used for independently platform, business and application being tested.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. the framework of a peer-to-peer network platform is characterized in that, comprising:
Communication layers is positioned at the bottom of the framework of peer-to-peer network platform, by message transfer between physical network or simulator and the peer-to-peer, communicates by abstract API of network and stack stratum reticulare;
The stack stratum reticulare is positioned on the communication layers, under the service layer, realizes the routing function of peer-to-peer network, communicates message transfer between communication layers and service layer by universal programming interface and service layer;
Service layer is positioned on the stack stratum reticulare, provides service to the application of user terminal;
Described communication layers specifically comprises:
The transmission sublayer is used for message transfer between host-host protocol by reality and the peer-to-peer, and the host-host protocol by reality provides network abstract API to the stack stratum reticulare;
The analogue transmission layer is used for realizing emulation transmission sublayer by carrying out interaction with network topology simulation maker, by message transfer between this emulation transmission sublayer and the peer-to-peer, provides network abstract API by this emulation transmission sublayer to the stack stratum reticulare.
2. the framework of peer-to-peer network platform according to claim 1 is characterized in that, comes the described transmission sublayer or the analogue transmission layer of shielded communication layer use by the abstract API of described network.
3. the framework of peer-to-peer network platform according to claim 1 is characterized in that, the abstract API of described network comprises: the package interface of the abstract message encapsulation interface of network, communication layers function and synchronous receiving interface.
4. according to the framework of claim 1 or 2 or 3 described peer-to-peer network platforms, it is characterized in that described stack stratum reticulare specifically comprises:
The stack sublayer is used to realize node identification management, routing function and the load-balancing function of peer-to-peer network, and the message that communication layers is uploaded sends to service layer, and the message that service layer is issued sends to communication layers;
The overlay network simulator is used for realizing emulation stack sublayer by calling analog node, by this emulation stack sublayer message transfer between communication layers and service layer.
5. the framework of peer-to-peer network platform according to claim 4 is characterized in that, described overlay network simulator externally provides simulator interface, and the function of emulation stack sublayer is provided by this simulator interface.
6. the framework of peer-to-peer network platform according to claim 4 is characterized in that, the diversity that described stack stratum reticulare comes defined node according to node capacity is utilized this diversity to carry out disturbance rejection and handled.
7. the framework of peer-to-peer network platform according to claim 4 is characterized in that, shields stack sublayer or the overlay network simulator that the stack stratum reticulare uses described reality by described universal programming interface.
8. the framework of peer-to-peer network platform according to claim 4, it is characterized in that described universal programming interface comprises: this node transmits message to the interface of the interface of the pairing peer-to-peer of keyword, the interface that receives the message of all the other nodes transmissions, the pairing peer-to-peer of search key with obtain the interface of neighbours' peer information.
9. the framework of peer-to-peer network platform according to claim 1 is characterized in that, described service layer provides service to comprise: distributed hashtable, at least one item in non-centralized object location and route and group's clean culture or the multicast.
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| CN109379331A (en) * | 2018-09-07 | 2019-02-22 | 海信集团有限公司 | Message treatment method, device, cloud platform and Internet of things system |
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| CN1578230A (en) * | 2003-07-21 | 2005-02-09 | 微软公司 | Secure hierarchical namespaces in peer-to-peer networks |
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