JGroups: : a Java system for communicating with a group of machines
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1 Hello IP API JGroups: : a Java system for communicating with a group of machines Savaş Ali TOKMEN MSc in Computer Engineering UFR IMA, Grenoble, FRANCE Savaş Ali TOKMEN JGroups - page 1
2 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 2
3 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 3
4 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 4
5 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 5
6 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 6
7 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Savaş Ali TOKMEN JGroups - page 7
8 IP IP API Aim: resource-efficient data transmission to multiple targets IGMP protocol Radio / Video transmission, OSPF Savaş Ali TOKMEN JGroups - page 8
9 JGroups IP API Initial aim: to provide a Java class for IP Extensions: Choice between protocols: UDP, TCP, JMX Subscription and unsubscription notification Crashed member detection Reliable and ordered transmissions Point-to-point messaging Fragmentation of big messages Scheduling policies: atomic (all or none), FIFO, total order Encryption Savaş Ali TOKMEN JGroups - page 9
10 JGroups API IP API Channel creation: new JChannel(props); with properties such as: Transport protocol Reliable or non-reliable transmissions Scheduling policies connect method to join the group send method for or unicast sending receive method (blocking) or publish / subscribe alerts for receiving disconnect method to quit group Savaş Ali TOKMEN JGroups - page 10
11 Example IP API Request distribution system Communication types: Machine types: HTTP request HTTP response JGroups Client Server Network entry point Savaş Ali TOKMEN JGroups - page 11
12 Demonstration IP API Distributor's code public void OnRequest( HTTPRequest request ) { // Get the list of available servers Vector<Address> servers = channel.getview().getmembers(); if( servers.size() <= 1 ){ // In this case, there are no servers! OnError( 501 ); } else { int gatewayposition = servers.indexof(channel.getlocaladdress()); int targetserver = gatewayposition; // Pick a server to process request, make sure it really // is a server and not the distributor while ( targetserver == gatewayposition ) { targetserver = random.nextint(servers.size()); } // Redirect request to server. Server will respond to client directly. channel.send(new Message( servers.get(targetserver), null, request )); } } Servers' code while( true ) { // Wait for a request Object o = channel.receive(0); // Only process normal messages if( o instanceof Message ) { o = ((Message) o).getobject(); // Verify that it's an HTTP request if( o instanceof HTTPRequest ) { // Call the standard HTTP server program with request ProcessRequest( (HTTPRequest) o ); } } } Savaş Ali TOKMEN JGroups - page 12
13 How JGroups IP API Ethereal Savaş Ali TOKMEN JGroups - page 13
14 Pros and perspectives IP API Pros and perspectives Cons Pros: Stable system for dynamic groups Very modular architecture (OSI) Ships with 19 examples and 117 tests Open projects Ethereal plugin Bluetooth support Compatibility with Java standards: JavaSpaces,... HTTP load balancer Savaş Ali TOKMEN JGroups - page 14
15 Cons IP API Pros and perspectives Cons Functionnalities not offered by JGroups but offered by rivals such as.net: Packet coalescing Priorities Per-message transmission options Subgroups Stream exchanging State exchange JGroups doesn't have a logo! User's manual partially empty Savaş Ali TOKMEN JGroups - page 15
16 Questions? IP API Questions? Savaş Ali TOKMEN JGroups - page 16
17 References IP API JGroups web site and links in it (mostly JBoss presentations) Web sites such as Wikipedia or Cisco for information about grouping and load balancing protocols in TCP/IP Ethereal Didier Donsez' lecture notes on Jini Microsoft's MSDN library Savaş Ali TOKMEN JGroups - page 17
18 Thank you Thank you Documents available on Savaş Ali TOKMEN JGroups - page 18
19 Savaş Ali TOKMEN JGroups - page 19
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