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// **********************************************************************
//
// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceInternal;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionException;
import Ice.CommunicatorDestroyedException;
import Ice.ConnectionI;
public class QueueRequestHandler implements RequestHandler
{
public
QueueRequestHandler(Instance instance, RequestHandler delegate)
{
_executor = instance.getQueueExecutor();
assert(delegate != null);
_delegate = delegate;
}
@Override
public RequestHandler
connect()
{
performCallable(new Callable<Void>()
{
@Override
public Void call()
{
_delegate.connect();
return null;
}
});
return this;
}
@Override
public RequestHandler
update(RequestHandler previousHandler, RequestHandler newHandler)
{
//
// Only update to new handler if the previous handler matches this one.
//
if(previousHandler == this)
{
if(newHandler != null)
{
return new QueueRequestHandler(_delegate.getReference().getInstance(), newHandler);
}
else
{
return null;
}
}
return this;
}
@Override
public void
prepareBatchRequest(final BasicStream out) throws RetryException
{
try
{
performCallable(new Callable<Void>()
{
@Override
public Void call() throws RetryException
{
_delegate.prepareBatchRequest(out);
return null;
}
});
}
catch(RuntimeException ex)
{
if(ex.getCause() instanceof RetryException)
{
throw (RetryException)ex.getCause();
}
throw ex;
}
}
@Override
public void
finishBatchRequest(final BasicStream out)
{
performCallable(new Callable<Void>()
{
@Override
public Void call() throws RetryException
{
_delegate.finishBatchRequest(out);
return null;
}
});
}
@Override
public void
abortBatchRequest()
{
performCallable(new Callable<Void>()
{
@Override
public Void call()
{
_delegate.abortBatchRequest();
return null;
}
});
}
@Override
public int
sendAsyncRequest(final OutgoingAsyncBase out) throws RetryException
{
try
{
return performCallable(new Callable<Integer>()
{
@Override
public Integer call() throws RetryException
{
return _delegate.sendAsyncRequest(out);
}
});
}
catch(RuntimeException ex)
{
if(ex.getCause() instanceof RetryException)
{
throw (RetryException)ex.getCause();
}
throw ex;
}
}
@Override
public void
asyncRequestCanceled(final OutgoingAsyncBase outAsync, final Ice.LocalException ex)
{
performCallable(new Callable<Void>()
{
@Override
public Void call()
{
_delegate.asyncRequestCanceled(outAsync, ex);
return null;
}
});
}
@Override
public Reference
getReference()
{
return _delegate.getReference();
}
@Override
public ConnectionI
getConnection()
{
return _delegate.getConnection();
}
@Override
public ConnectionI
waitForConnection()
throws InterruptedException, RetryException
{
return _delegate.waitForConnection();
}
private <T> T performCallable(Callable<T> callable) {
try
{
Future<T> future = _executor.submit(callable);
boolean interrupted = false;
while(true)
{
try
{
T value = future.get();
if(interrupted)
{
Thread.currentThread().interrupt();
}
return value;
}
catch(InterruptedException ex)
{
interrupted = true;
}
}
}
catch(RejectedExecutionException e)
{
throw new CommunicatorDestroyedException();
}
catch(ExecutionException e)
{
try
{
throw e.getCause();
}
catch(RuntimeException ex)
{
throw ex;
}
catch(Throwable ex)
{
throw new RuntimeException(ex);
}
}
}
private final RequestHandler _delegate;
private final ExecutorService _executor;
}
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