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# Coordinated Cache Architecture

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TopLink provides coordinated cache implementations that perform discovery and message transport services using various technologies including the following:

- Java Message Service (JMS)–See "JMS Coordinated Cache"

- Remote Method Invocation (RMI)–See "RMI Coordinated Cache"

- Common Object Request Broker Architecture (CORBA)–See "CORBA Coordinated Cache"

Regardless of the type of discovery and message transport you choose to use, the following are the principal objects that provide coordinated cache functionality:

- Session

- Descriptor

- Unit of Work