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Chapter 10: Execution Models

Chapter 10: Execution Models. Service-Oriented Computing: Semantics, Processes, Agents – Munindar P. Singh and Michael N. Huhns, Wiley, 2005. Highlights of this Chapter. Interoperation Architecture Messaging Peer-to-Peer Computing Enterprise Service Bus CORBA Jini Grid Computing.

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Chapter 10: Execution Models

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  1. Chapter 10:Execution Models Service-Oriented Computing: Semantics, Processes, Agents– Munindar P. Singh and Michael N. Huhns, Wiley, 2005

  2. Highlights of this Chapter • Interoperation Architecture • Messaging • Peer-to-Peer Computing • Enterprise Service Bus • CORBA • Jini • Grid Computing Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  3. Interoperation (Standards and Technologies) • Requires surmounting a series of challenges • Transport: HTTP, SMTP, SIP • Messaging: XML (including XQuery …), SOAP • Data and structure: WSDL • Finding and binding: UDDI, QoS techniques • Semantics: ontologies (RDF, OWL, IEEE SUO, Cyc) • Transactions: WS-Coordination, WS-AtomicTransaction, WS-BusinessActivity • Process: OWL-S, WS-CDL, PSL, BPEL4WS • Policy: XACML • Dynamism: FIPA AMS, RuleML, Jason • Cooperation: FIPA ACL, multiagent systems Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  4. Application Interoperation Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  5. Architectural Elements • Low-level (included in app server): • Directories, messaging • Data and process interoperation: • Metadata and transformations • Routing • Rules engine • Business process • Modeling and execution engine Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  6. Invocation-Based Adapters • Common in distributed object settings (EJBs, DCOM, CORBA) • Synchronous: blocking method invocation • Asynchronous: nonblocking (one-way) method invocation with callbacks • Deferred synchronous: (in CORBA) sender proceeds independently of the receiver, but only up to a point • Execution is best effort, at most once • More than once is OK for idempotent operations, not otherwise Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  7. Message-Oriented Middleware: 1 Analogous to store and forward networks • Queues: point to point • Support posting and reading messages • Topics: logical multicasts • Support publishing and subscribing to application-specific topics • Thus more flexible than queues • Some messages correspond to event notifications Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  8. Message-Oriented Middleware: 2 • Inherently asynchronous • Supports loose coupling • Reliability: cannot guarantee successful message delivery, but can provide failure notification • Usually used through an invocation-based interface • By polling or via registered callbacks • onMessage() method of message-driven beans Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  9. Enterprise Service Bus An abstraction separating enterprise services and transport • Supports services as units of functionality • Supports routing of messages (via MoM or Web services or anything else) • Enables an architectural style in which transformers convert message formats • Often accompanied with modules for process, policy, logging, identity management, … Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  10. Peer-to-Peer Computing Models of computation • Symmetric client-server: Each party can query the other, thereby giving each power over the other at different times • Doesn't fundamentally look beyond client-server • Asynchrony: While the request-response paradigm corresponds to pull, asynchronous communication corresponds to push • Undesirable: push applications that place their entire intelligence on the server (pushing) side • Federation of equals: When the participants can enact whatever protocols they see fit Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  11. Chapter 10 Summary • Increasingly, interoperation architectures promote loose coupling and arms-length relationships • Hence focus on messaging • Similar challenges have been addressed multiple times but service improvements result in easier composition and deployment of services Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

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