Tapestry Inversion of Control Container
Main article: Tapestry IoC
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Why do I need to define an interface for my services? Why can't I just use the class itself?
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This same concern applies to any long-lived resource (a thread, a database connection, a JMS queue connection) that a service may hold onto. Your code needs to know when the application has been undeployed and shutdown. This is actually quite easy, by adding some post-injection logic to your implementation class.
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| language | java |
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| title | MyServiceImpl.java |
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public class MyServiceImpl implements MyService
{
private boolean shuttingDown;
private final Thread workerThread;
public MyServiceImpl()
{
workerThread = new Thread(. . .);
}
. . .
@PostInjection
public void startupService(RegistryShutdownHub shutdownHub)
{
shutdownHub.addRegistryShutdownListener(new Runnable()
{
public void run()
{
shuttingDown = true;
workerThread.interrupt();
}
});
}
}
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It is not recommended that MyServiceImpl take RegistryShutdownHub as a constructor parameter and register itself as a listener inside the constructor. Doing so is an example of unsafe publishing, a remote an unlikely but potential thread safety issue. |
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The solution is the @EagerLoad annotation; service implementation classes marked with this annotation are loaded when the Registry is first startup, rather than lazily.