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package JACE.netsvcs.Token;
import JACE.Concurrency.*;
/**
* LockHandler implementation for a reader/writer mutex lock.
* <P>
* Since it uses RWMutex as the actual lock, it doesn't support
* nested acquires.
*
*@see LockHandler
*/
public class RWMutexHandler extends LockHandlerAdapter
{
static class ExtendedRWMutex extends RWMutex
{
// This is so that we don't make any assumptions about previous
// implementations of LockAdapter, and enable owner checking with
// the client ID from TokenRequest. The thread name is set in
// handleRequest.
protected Object accessorID ()
{
return Thread.currentThread().getName();
}
}
/**
* Default constructor.
*/
public RWMutexHandler ()
{
super (new ExtendedRWMutex ());
}
public TokenReply handleRequest (TokenRequestHandler caller,
TokenRequest request)
{
// Set the name of this thread to the client ID to perform
// proper owner checking.
Thread.currentThread().setName (request.clientID ());
// process the request
return super.handleRequest (caller, request);
}
public void abandonLock (String clientID)
{
// Set the name of this thread to the client ID to perform
// proper owner checking.
Thread.currentThread().setName (clientID);
super.abandonLock (clientID);
}
}
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