The Java plug-in API is a collection of classes, abstarct classes, interfaces, and relationships you can use to implement ARDBC, AREA, aan AR filter plug-ins in Java to run using the AR System 7.1 Java-based plug-in server. See the Integrating with Plug-ins and Third-Party Products guide for information about configuring the plug-in server and about setting up to use the Java plug-in API.
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The Java plug-in API includes an interface and an abstract class for each plug-in type. Your Java plug-in program must implement one of the interfaces or extend one of the abstract classes.
Interface |
Extends |
|---|---|
| Abstract class | Extends | Implements |
|---|---|---|
Two or more Java plug-in classes can be configured in a plug-in set or group as described in the Integrating with Plug-ins and Third-Party Products guide. When the plug-in server starts, it loads each configured plug-in class or group in a separate class loader and any static initialization in the classes is executed. Each time the AR System server makes a connection to a plug-in server, the plug-in server creates a new thread and, for each new thread, creates an instance of each plug-in class already loaded. Plug-in classes must load classes they depend on.
Different instances of a class can share data in the static class variables. To be thread safe, however, the class implementation must protect this static data. Plug-ins can also share data in a thread safe way by implementing the createInstance method for the plug-in. The server calls this method once for every instance of the plug-in created when a new thread is started. The instance data returned by createInstance is passed to every method. See the Java plug-in API online documentation for details.
The class can use instance variables to store data that is not shared. Because each thread has a separate instance, this data is thread safe.
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