1. Triana: Service-Oriented Examples Ian Taylor Cardiff University, and the Center for Computation and Technology (CCT) @ LSU

2. Our Research Motivation Based on research within the Triana project: Triana - a vehicle for investigating research into distributed systems a workflow-based Problem Solving Environment Goals: To make the access of distributed services as seamless as possible To connect heterogeneous Grids To abstract the core capabilities needed for service-based computing (in P2P, Web services or Grid Computing)

3. Research Scope Triana is currently funded through 2 main research projects: GridOneD: to investigate P2P and integrating visual distributed programming for Gravitational Wave applications GridLab: one of the 2 project applications (other is Cactus) used to shape the Grid Application Toolkit (GAT)

4. Triana, the GAT and the GAP P2PSJXTA Web Services GAP Interface UDDI SOAP P2PS Discovery P2PS Pipes JXTA Discovery JXTA Pipes GAT Interface Condor Globus RLS Unicore PBS GridLab GRMS SGESSH WSRF LDR.NET Other.. GridFTP Grid Computing: Job Submission, File services A Graphical Grid Computing Environment or Portal Service Based Computing: Deployment, discovery and communication with distributed services e.g. P2P and (GSI) Web services Grid services

5. Service Discovery + Choreography Web services Connecting Web services and integrating with other Triana units Service Deployment Peer-to-peer services Distributing Audio !!! Generic example - can try and distribute using other networks Shows the basic interface to distribution Short Course: Service-Oriented Usage

6. GAP Interface Motivation by GAT A Simple Service based API, for Service Deployment, Service Discovery Pipe Based Communication Static application interface with multiple middleware bindings P2PS (name…?) JXTA Web services P2PSJXTA Web Services GAP Interface UDDI SOAP P2PS Discovery P2PS Pipes JXTA Discovery JXTA Pipes

7. Service Oriented Comms network babelfish. altavista. com BabelFish en_fr hello bonjour Service Discovery Dynamic? Decentralized? Communication Message Format SOAP? Transport Protocol TCP? UDP? GAP

8. GAP Interface Simple Java API Peer-to-Peer Discovery Pipe-Based Communication Multiple Bindings JXTA P2PS Web Services (WSPeer)

9. public class Server implements MessageListener { public Server(Peer parentpeer) throws PeerException { // create the server service Peer peer = parentpeer.createService(SERVER_SERVICE); // create the server contrrol pipe peer.createControlPipe(SERVER_PIPE, this); // deploy and advertise the service peer.deployService(); peer.advertiseService(); } public void messageReceived(MessageEvent event) { // do something when a message is received } public static void main(String[] args) { new Server(new JXTAPeer()); } public class Server implements MessageListener { public Server(Peer parentpeer) throws PeerException { // create the server service Peer peer = parentpeer.createService(SERVER_SERVICE); // create the server contrrol pipe peer.createControlPipe(SERVER_PIPE, this); // deploy and advertise the service peer.deployService(); peer.advertiseService(); } public void messageReceived(MessageEvent event) { // do something when a message is received } public static void main(String[] args) { new Server(new JXTAPeer()); } public class Server implements MessageListener { public Server(Peer parentpeer) throws PeerException { // create the server service Peer peer = parentpeer.createService(SERVER_SERVICE); // create the server contrrol pipe peer.createControlPipe(SERVER_PIPE, this); // deploy and advertise the service peer.deployService(); peer.advertiseService(); } public void messageReceived(MessageEvent event) { // do something when a message is received } public static void main(String[] args) { new Server(new WSPeer()); } GAP Interface

10. P2P GAP Bindings Two Main Bindings Jxta legacy implementation, due to upgrade soon… P2PS Simple (lightweight) P2P System Uses in Triana, NRL (sensor nets) and Simulations (within NS-2) Useful in highly dynamic environments Based on some Jxta principles i.e. pipes, rendezvous nodes, dynamic discovery, etc Capable of building small-world networks (centralised- decentralised)

11. P2PS Overview Discovery Service Broadcast/Locate Adverts + Queries in Discovery Subnet Pipe Service Connect Pipes using Endpoint Resolvers Rendezvous Service Send/Receive Adverts + Queries from known Rendezvous Peers Resolvers Pluggable Network Interfaces For Ns2 simulation environment TCP Resolver??? Resolver Discovery Service Rendezvous Service P2PS Peer Pipe Service UDP Resolver Network UDPTCP???

12. WSPeer High Level Interface to Web Services Discovery Invocation Deployment Hosting Abstract from usual Web Service Discovery and Communication Mechanisms (i.e. UDDI and HTTP) P2PS Web Service Discovery? Uses Apache AXIS as SOAP Engine Extends Capabilities of Apache AXIS Stubless Invocation (including complex types) Non Standard Transports (i.e. P2PS)

13. WSPeer WSPeer – P2PS Application WSPeer – HTTP/UDDI deploypublishlocateinvoke UDDI HTTP Server deploy launch server publishlocate invoke deploy publish locate invoke

14. Service Discovery + Choreography Web services Connecting Web services and integrating with other Triana units Service Deployment Peer-to-peer services Distributing Audio !!! Generic example - can try and distribute using other networks Shows the basic interface to distribution Short Course: Service-Oriented Usage