JXTA Protocol Introduction Student : Jia-Hui Huang Adviser : Kai-Wei Ke Date : 2005/11/22.

JXTA Protocol JXTA Protocol IntroductionIntroduction

Student : Jia-Hui HuangStudent : Jia-Hui Huang

Adviser : Kai-Wei KeAdviser : Kai-Wei Ke

Date : 2005/11/22Date : 2005/11/22

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P2P IntroductionP2P IntroductionJXTA IntroductionJXTA IntroductionJXTA AssumptionsJXTA AssumptionsJXTA ConceptJXTA ConceptJXTA ProtocolsJXTA ProtocolsJXTA Connection ScenarioJXTA Connection ScenarioDemoDemoSummarySummary

P2P Introduction (1/2)P2P Introduction (1/2)

The term “ Peer-to-Peer ” refers to a class of The term “ Peer-to-Peer ” refers to a class of system/networks that :system/networks that : Distributed resourcesDistributed resources Perform function in a decentralized mannerPerform function in a decentralized manner

Each node potentially has the same Each node potentially has the same responsibility & capability.responsibility & capability.

Sharing can be in many ways :Sharing can be in many ways : CPU Cycle : share workloadCPU Cycle : share workload Storage space : Napster, Gnutella, Freenet … etcStorage space : Napster, Gnutella, Freenet … etc

P2P Introduction (2/2)P2P Introduction (2/2)

Why attractive ? Why attractive ? ScalabilityScalability Reliability Reliability

Client – Server Ex. FTP

Peer-to-Peer Ex. Bit Torrent

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JXTA Introduction(1/3)JXTA Introduction(1/3)

What is JXTA Protocol ?What is JXTA Protocol ? Developed by Sun Microsystems, Inc. 2001 v 1.0Developed by Sun Microsystems, Inc. 2001 v 1.0 Provide the basic P2P infrastructureProvide the basic P2P infrastructure Each resource are published as advertisementEach resource are published as advertisement Some characteristic of JXTA networkSome characteristic of JXTA network

Discover each otherDiscover each other

Self-organize into peer groupSelf-organize into peer group

Advertise and discover network resourceAdvertise and discover network resource

Communicate with each otherCommunicate with each other

Monitor each otherMonitor each other


JXTA Protocol are composed six ProtocolsJXTA Protocol are composed six Protocols the following six protocol cooperate with other, and form JXTA the following six protocol cooperate with other, and form JXTA

protocolprotocol

Peer Resolver Protocol ( PRP )Peer Resolver Protocol ( PRP ) Peer Discovery Protocol ( PDP )Peer Discovery Protocol ( PDP ) Peer Information Protocol ( PIP )Peer Information Protocol ( PIP ) Pipe Binding Protocol ( PBP )Pipe Binding Protocol ( PBP ) Endpoint Routing Protocol ( ERP )Endpoint Routing Protocol ( ERP ) Rendezvous Protocol ( RVP )Rendezvous Protocol ( RVP )


Not all protocol are necessaryNot all protocol are necessary JXTA core Protocol – requiredJXTA core Protocol – required

PRPPRP

ERPERP JXTA standard protocol – not requiredJXTA standard protocol – not required

Remaining JXTA Protocols ( PDP …etc )Remaining JXTA Protocols ( PDP …etc )

More standard protocol increase More standard protocol increase interoperabilityinteroperability

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JXTA JXTA AssumptionsAssumptions (1/2) (1/2)

Peer not assume run time environments aPeer not assume run time environments and programming languagesnd programming languagesPeers may appear, disappear and migrate Peers may appear, disappear and migrate at any timeat any timeCommunication between two peers is uni-Communication between two peers is uni-directional at same timedirectional at same timeData delivery is unreliableData delivery is unreliableProtocol messages and advertisements arProtocol messages and advertisements are defined using XML messagese defined using XML messages

JXTA JXTA AssumptionsAssumptions (2/2) (2/2)

Message is give up delivery if destination iMessage is give up delivery if destination is not availables not available

Each peer must be a member of the Net PEach peer must be a member of the Net PeerGroupseerGroups

Peers must be members of the same peer Peers must be members of the same peer group in order to exchange messagesgroup in order to exchange messages

The published content is not guarantee caThe published content is not guarantee can be received from JXTA networkn be received from JXTA network

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JXTAJXTA ConceptConcept (1/7) (1/7)

PeersPeers Any network device that implement JXTA Core ProtocolAny network device that implement JXTA Core Protocol Identify by a unique IDIdentify by a unique ID Distribute resources and services using advertisement mechanisDistribute resources and services using advertisement mechanis

mm May advertisement multiple network interface - endpointMay advertisement multiple network interface - endpoint

PeerGroupsPeerGroups A common set of peer self-organized into a peer grouA common set of peer self-organized into a peer grou

pp Identify by a unique PeerGroup IDIdentify by a unique PeerGroup ID Peer group provide a set of servicePeer group provide a set of service

JXTA Concept (2/7)JXTA Concept (2/7)

Discovery serviceDiscovery service Used by member to discovery resources ( pipe ….etc )Used by member to discovery resources ( pipe ….etc )

Membership serviceMembership service Used by member to accept of reject new peer join Used by member to accept of reject new peer join

requestrequest

Access serviceAccess service Used to validate requests made by one peer to anotherUsed to validate requests made by one peer to another

Pipe servicePipe service Manage and create pipe between different group Manage and create pipe between different group

membersmembers

Monitoring serviceMonitoring service Allow peer monitor each other in same groupAllow peer monitor each other in same group


Two level of network serviceTwo level of network service Peer servicePeer service

Accessible only one the peer that is publishing the serviceAccessible only one the peer that is publishing the service Peer group servicePeer group service

Running on multiple members of the peer groupRunning on multiple members of the peer group

pipespipes A virtual communication channel for peer exchange A virtual communication channel for peer exchange

message, many type of pipe can establishmessage, many type of pipe can establish Two mode of pipe transferTwo mode of pipe transfer

Point to Point PipePoint to Point PipePropagate PipePropagate Pipe


IDsIDs Each JXTA resource has a unique ID to identifEach JXTA resource has a unique ID to identif

y an entityy an entity These resource include Peers, PeerGroups, cThese resource include Peers, PeerGroups, c

ontent, pipes, module classes/spec.ontent, pipes, module classes/spec.

codatscodats Combination of content and its associated JXCombination of content and its associated JX

TA IDTA ID


ModuleModule Module indicates the “service” provided by peModule indicates the “service” provided by pe

er or PeerGrouper or PeerGroup

Module classModule class Define the service type, have a unique idDefine the service type, have a unique id

Module specificationModule specification Define the service specification, have a uniquDefine the service specification, have a uniqu

e ide id


All resource on the JXTA network are All resource on the JXTA network are publish as advertisementpublish as advertisementPeer advertisementPeer advertisement Describe a peer ID, name and other resourceDescribe a peer ID, name and other resource

Peer group advertisementPeer group advertisement Describe a peer group specific resourceDescribe a peer group specific resource

Module class advertisementModule class advertisement Describe a particular module class id stand Describe a particular module class id stand

for what type servicefor what type service


Module specification advertisementModule specification advertisement Describe what particular module spec. ID Describe what particular module spec. ID

stand for which spec.stand for which spec.

Module implementation advertisementModule implementation advertisement Describe one of implementation of a specific Describe one of implementation of a specific

spec. it also provide necessary parameter of spec. it also provide necessary parameter of use this implementationuse this implementation

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JXTA ProtocolsJXTA Protocols

Two types of JXTA ProtocolTwo types of JXTA Protocol JXTA Core Protocol – requiredJXTA Core Protocol – required JXTA Standard Protocol – optionalJXTA Standard Protocol – optional

JXTA Core ProtocolJXTA Core Protocol

Protocol is a set of message format (XML) Protocol is a set of message format (XML) that exchange between peersthat exchange between peers

JXTA Core Specification defineJXTA Core Specification define ：： Peer Resolver Protocol Peer Resolver Protocol Endpoint Routing Protocol Endpoint Routing Protocol

Peer resolver protocol (PRP)Peer resolver protocol (PRP)

Provide a resolution service, used to send Provide a resolution service, used to send query and receive responsequery and receive response

Each query and response is addressed Each query and response is addressed with a handlerwith a handler

Handler is a demultiplexing key that Handler is a demultiplexing key that specifies how, by which higher-level specifies how, by which higher-level protocol to be processedprotocol to be processed

Endpoint routing protocol (ERP)(1/3)Endpoint routing protocol (ERP)(1/3)

ERP is used for routingERP is used for routing

When a peer wants to issue a message, it When a peer wants to issue a message, it process is as followsprocess is as follows ：： Peer lookup his local cachePeer lookup his local cache If exist route information then directly useIf exist route information then directly use If no exist route information then find available If no exist route information then find available

peer router for asking (send route resolver qupeer router for asking (send route resolver query message)ery message)


When peer router receive a route queryWhen peer router receive a route query If it know route information it will return as an enumerIf it know route information it will return as an enumer

ation of hopation of hop If it don’t know then peer will asking other peer router If it don’t know then peer will asking other peer router

until no peer routeruntil no peer router Finally, if no peer router knows then give up routing thFinally, if no peer router knows then give up routing th

is messageis message notenote：： routing information may obsolete at any hoprouting information may obsolete at any hop

Shared Resource Distributed Index (SRDI)Shared Resource Distributed Index (SRDI) Utilize the set of rendezvous peer as resource index tUtilize the set of rendezvous peer as resource index t

o help message directiono help message direction


At each hop the peer will extra a peer id At each hop the peer will extra a peer id information in the message header use forinformation in the message header use for Loop detectLoop detect New route discoveryNew route discovery

Message is a basic unit of data exchange Message is a basic unit of data exchange and the process is like packet in protocol and the process is like packet in protocol stackstack

JXTA Standard ProtocolsJXTA Standard Protocols

Rendezvous Protocol (RVP)Rendezvous Protocol (RVP)

Peer Discovery Protocol (PDP) Peer Discovery Protocol (PDP)

Peer Information Protocol (PIP)Peer Information Protocol (PIP)

Pipe Binding Protocol (PBP)Pipe Binding Protocol (PBP)

Rendezvous protocol (RVP) (1/3)Rendezvous protocol (RVP) (1/3)

RVP is used to propagate message within a peer groupRVP is used to propagate message within a peer groupA peergroup may contains more than one rendezvous A peergroup may contains more than one rendezvous peer.peer.The set of rendezvous peer perform a peer viewThe set of rendezvous peer perform a peer view

The PeerView is a list of the peers which are currently acting as The PeerView is a list of the peers which are currently acting as Rendezvous Peers.Rendezvous Peers.

The RVP can divided into three partsThe RVP can divided into three parts Management protocol (peer view protocol)Management protocol (peer view protocol)

An optional protocol used by Rendezvous Peers to organize An optional protocol used by Rendezvous Peers to organize themselvesthemselvesEach Rendezvous Peer maintains its own local list of active Each Rendezvous Peer maintains its own local list of active PeerView membersPeerView membersRendezvous Peer exchange message with each otherRendezvous Peer exchange message with each other

Rendezvous protocol (RVP)(2/3)Rendezvous protocol (RVP)(2/3)

Connection registration protocol (rendezvous Connection registration protocol (rendezvous lease protocol)lease protocol)

An optional protocol enables non-Rendezvous An optional protocol enables non-Rendezvous Peers to subscribe to receive propagated Peers to subscribe to receive propagated messages. ( act as a rendezvous peer )messages. ( act as a rendezvous peer )

Leases are of fixed duration.Leases are of fixed duration.

Rendezvous Peers offer lease its ability to Rendezvous Peers offer lease its ability to distribute message.distribute message.

Both rendezvous peer and subscriber can Both rendezvous peer and subscriber can terminate the lease at any time.terminate the lease at any time.

Rendezvous protocol (RVP) (3/3)Rendezvous protocol (RVP) (3/3)

Propagated message (rendezvous propagatioPropagated message (rendezvous propagation protocol)n protocol)

A required protocol, enable peers to manage the prA required protocol, enable peers to manage the propagation of individual message.opagation of individual message.

Propagation stop conditionPropagation stop condition：： Loop/Duplicate ( detected by unique id )Loop/Duplicate ( detected by unique id ) TTL TTL

Rendezvous advertisement is used for desRendezvous advertisement is used for describe a peer become a rendezvous peercribe a peer become a rendezvous peer

Peer discovery protocol (PDP) (1/2)Peer discovery protocol (PDP) (1/2)

PDP is used to discover resource within a PDP is used to discover resource within a groupgroup

Discovery peers behavior Discovery peers behavior

Use the field attribute and threshold to Use the field attribute and threshold to match querymatch query

PDP message is not guarantee responsePDP message is not guarantee response

Peer discovery protocol (PDP)(2/2)Peer discovery protocol (PDP)(2/2)

Five Scenario of discoveryFive Scenario of discovery Local Cache Local Cache Local DiscoveryLocal Discovery Using Rendezvous Peer w/o PropagationUsing Rendezvous Peer w/o Propagation Using Rendezvous Peer over FirewallUsing Rendezvous Peer over Firewall Using Rendezvous Peer and PropagationUsing Rendezvous Peer and Propagation

Peer information protocol (PIP)Peer information protocol (PIP)

An optional protocol, Used to obtain a peer An optional protocol, Used to obtain a peer status information.status information.

No guarantee response.No guarantee response.

Information include :Information include : Timestamp Timestamp TrafficTraffic

LastInCommingMessageAtLastInCommingMessageAt

LastOutgoingAt … etcLastOutgoingAt … etc SourcePidSourcePid TargetPid … etcTargetPid … etc

Pipe binding protocol (PBP)Pipe binding protocol (PBP)

PBP is used to create a pipe between two PBP is used to create a pipe between two peer (virtual communication channel)peer (virtual communication channel)

The underlying transport can use JXTA The underlying transport can use JXTA HTTP, JXTA TCP/IP or secure JXTA TLS HTTP, JXTA TCP/IP or secure JXTA TLS TransportTransport

The pipe can viewed as a message queue The pipe can viewed as a message queue that support create, bind, close, delete, that support create, bind, close, delete, send, and receive operationsend, and receive operation

Pipe advertisementPipe advertisement

Used to describe a local binded pipe informationUsed to describe a local binded pipe information

Each advertisement has a pipe type fieldEach advertisement has a pipe type field

Currently three type has definedCurrently three type has defined JXTAUnicastJXTAUnicast

Unicast, unsecure, unreliable pipe.Unicast, unsecure, unreliable pipe. JXTAUnicastSecureJXTAUnicastSecure

Unicast, secure ( using TLS ) pipe.Unicast, secure ( using TLS ) pipe. JXTAPropagate Diffusion pipesJXTAPropagate Diffusion pipes

Diffusion pipes, used to send one-to-many messages.Diffusion pipes, used to send one-to-many messages.

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JXTA message transportsJXTA message transports

Three Scenario of message transportsThree Scenario of message transports Communication across Firewall (outside to Communication across Firewall (outside to

inside)inside) Message to Peer across one Firewall (inside Message to Peer across one Firewall (inside

to outside )to outside ) Message to Peer across two FirewallsMessage to Peer across two Firewalls

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DemoDemo

MessagingMessaging P2PAVConferenceP2PAVConference

File sharingFile sharing

Peer1

Peer2

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SummarySummary

Project JXTA establish a virtual network overlay Project JXTA establish a virtual network overlay on top of existing networks.on top of existing networks.JXTA provide a P2P systems, it achieve :JXTA provide a P2P systems, it achieve : InteroperabilityInteroperability Platform independencePlatform independence UbiquityUbiquity

It allow application developers build P2P It allow application developers build P2P application without take underlying network into application without take underlying network into account.account.P2P system become more easy to develop.P2P system become more easy to develop.

ReferenceReference

Sun Microsystems Inc. “ Sun Microsystems Inc. “ JXTA v2.0 Protocols JXTA v2.0 Protocols SpecificationSpecification ”, 2004 ”, 2004Li Gong Sun Microsystems, Inc “ Project JXTA : Li Gong Sun Microsystems, Inc “ Project JXTA : A Technology Overview ”, October 29 2002A Technology Overview ”, October 29 2002Bernard Traversat, Ahkil Arora, Mohamed AbdelBernard Traversat, Ahkil Arora, Mohamed Abdelaziz, Mike Duigou, Carl Haywood, Jean-Christopaziz, Mike Duigou, Carl Haywood, Jean-Christophe Hugly, Eric Pouyoul, Bill Yeager, “ Project JXhe Hugly, Eric Pouyoul, Bill Yeager, “ Project JXTA 2.0 Super-Peer Virtual Network ”, May 25 20TA 2.0 Super-Peer Virtual Network ”, May 25 200303www.jxta.orgwww.jxta.org

Discovery Scenario (1/5)Discovery Scenario (1/5)

lookup

communicate


multicastresponse


Discovery message

Response message


discovery

response cache

Connection Scenario (1/3)Connection Scenario (1/3)

By Propagate message

HTTP connection

Msg queue


Regular connection


HTTP HTTP

message

JXTA Protocol Introduction Student : Jia-Hui Huang Adviser : Kai-Wei Ke Date : 2005/11/22.

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Transcript of JXTA Protocol Introduction Student : Jia-Hui Huang Adviser : Kai-Wei Ke Date : 2005/11/22.