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Distributed Coordination-Based Systems. Chapter 12. Introduction to Coordination Models. A taxonomy of coordination models (adapted from [cabri.g2000]). Coordination Model (1). The principle of a publish/subscribe system as implemented in TIB/Rendezvous. Coordination Model (2).

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Presentation Transcript
introduction to coordination models
Introduction to Coordination Models
  • A taxonomy of coordination models (adapted from [cabri.g2000])
coordination model 1
Coordination Model (1)
  • The principle of a publish/subscribe system as implemented in TIB/Rendezvous.
coordination model 2
Coordination Model (2)
  • The overall architecture of a wide-area TIB/Rendezvous system.
basic messaging
Basic Messaging
  • Attributes of a TIB/Rendezvous message field.
events 1
Events (1)
  • Processing listener events for subscriptions in TIB/Rendezvous.
events 2
Events (2)
  • Processing incoming messages in TIB/Rendezvous.
processes
Processes
  • Priority scheduling of events through a queue group.
  • A semantically equivalent queue for the queue group with the specific event objects from (a).
naming 1
Naming (1)
  • Examples of valid and invalid subject names.
naming 2
Naming (2)
  • Examples of using wildcards in subject names.
synchronization 1
Synchronization (1)
  • The organization of transactional messaging as a separate layer in TIB/Rendezvous.
synchronization 2
Synchronization (2)
  • The organization of a transaction in TIB/Rendezvous.
reliable communication
Reliable Communication
  • The principle of PGM.
  • A message is sent along a multicast tree
  • A router will pass only a single NACK for each message
  • A message is retransmitted only to receivers that have asked for it.
security
Security
  • Establishing a secure channel in TIB/Rendezvous.
overview of jini
Overview of Jini
  • The general organization of a JavaSpace in Jini.
architecture
Architecture
  • The layered architecture of a Jini System.
communication events
Communication Events
  • Using events in combination with a JavaSpace
processes 1
Processes (1)
  • A JavaSpace can be replicated on all machines. The dotted lines show the partitioning of the JavaSpace into subspaces.
  • Tuples are broadcast on WRITE
  • READs are local, but the removing of an instance when calling TAKE must be broadcast
processes 2
Processes (2)
  • Unreplicated JavaSpace.
  • A WRITE is done locally.
  • A READ or TAKE requires the template tuple to be broadcast in order to find a tuple instance
processes 3
Processes (3)
  • Partial broadcasting of tuples and template tuples.
the jini lookup service 1
The Jini Lookup Service (1)
  • The organization of a service item.
the jini lookup service 2
The Jini Lookup Service (2)
  • Examples of predefined tuples for service items.
synchronization of transactions
Synchronization of Transactions
  • The general organization of a transaction in Jini. Thick lines show communication as required by Jini's transaction protocol
caching and replication
Caching and Replication
  • The position of PAM with respect to security services.