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 does not support Java • limited connectivity - eg 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 - eg independent software processes collaborating • out-of-process (physical connection) - eg serial IO over local cable / leased -Line • Out-of-process (Virtual Connection) - Eg Over the network; serial io over dialup; etc. • Out-of-process (broker) - EG Via A Middle-Man Such as an ORB, MQ, ETC.
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A JCA Adapter Interacts with a J2EE Server Via System Contracts. Three Types of System Contracts Can BE Used: • • Transaction Management • Security Structurement Management • Security, THRACTION MANAGEMENT • Security
