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package JACE.netsvcs.Token;
import JACE.Concurrency.*;
/**
* LockHandler implementation for a mutex lock.
* <P>
* Currently, this uses JACE.Concurrency.Token as the actual lock since
* it supports nested acquires.
*
*@see LockHandler
*/
public class MutexHandler extends LockHandlerAdapter
{
// Uses token since it supports nested acquires.
static class ExtendedMutex extends Token
{
// 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 MutexHandler ()
{
super (new ExtendedMutex ());
}
public TokenReply handleRequest (TokenRequestHandler caller,
TokenRequest request)
{
Thread.currentThread().setName (request.clientID ());
return super.handleRequest (caller, request);
}
public void abandonLock (String clientID)
{
Thread.currentThread().setName (clientID);
super.abandonLock (clientID);
}
}
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