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- 作者：zhaozj
- 发表时间：2020-12-23 10:35
- 来源：未知
General.Legacy connectivity refers to how Java components interact with a legacy system.Typical properties of a legacy system are :• developed in another programming language• runs in an environment that doesn’t support Java• limited connectivity – e.g. a mainframe that only supports physical connections
Connectivity Options.Generally, components can interact with software/services on a legacy system in the following ways :• in-process – e.g. independent software processes collaborating• out-of-process (physical connection) – e.g. serial IO over local cable / leased-line• out-of-process (virtual connection) – e.g. over the network; serial IO over dialup; etc.• out-of-process (broker) – e.g. via a middle-man such as an ORB, MQ, etc.
The JCA comprises a resource adapter, connection management contracts, a transaction management contract, a security contract, and the CCI.
A JCA adapter interacts with a J2EE server via system contracts. Three types of system contracts can be used:•?Connection management•?Transaction management• Security
