/*******************************************************************************
*
* Copyright 2010 Alexandru Craciun, and individual contributors as indicated
* by the @authors tag.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
******************************************************************************/
package org.netxilia.api.concurrent;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.netxilia.api.exception.IncompleteTaskException;
import org.netxilia.api.exception.NetxiliaBusinessException;
import org.netxilia.api.exception.NetxiliaResourceException;
import com.google.common.util.concurrent.ForwardingListenableFuture;
import com.google.common.util.concurrent.ListenableFuture;
public class NetxiliaListenableFutureAdapter<V> extends ForwardingListenableFuture<V> implements IListenableFuture<V> {
// private final static Logger log = Logger.getLogger(NetxiliaListenableFutureAdapter.class);
private volatile boolean hasListeners = false;
private final ListenableFuture<V> googleDelegate;
public NetxiliaListenableFutureAdapter(ListenableFuture<V> googleDelegate) {
this.googleDelegate = googleDelegate;
}
@Override
public void addListener(final IFutureListener<V> listener, Executor exec) {
hasListeners = true;
super.addListener(new Runnable() {
@Override
public void run() {
listener.ready(NetxiliaListenableFutureAdapter.this);
}
}, exec);
}
// @Override
// protected void done() {
// super.done();
// if (!hasListeners) {
// // if no listener - log the exception at the console otherwise the exception goes unnoticed
// try {
// super.get();
// } catch (ExecutionException ex) {
// log.error("Exception executing FutureTask: " + ex.getCause(), ex.getCause());
// } catch (Exception ex) {
// log.error("Exception executing FutureTask: " + ex, ex);
// }
// }
// }
@Override
public V getNonBlocking() throws NetxiliaResourceException, NetxiliaBusinessException {
return getNonBlocking(DEFAULT_TIMEOUT_MS, TimeUnit.MILLISECONDS);
}
@SuppressWarnings("unchecked")
private <T extends Exception> T getNetxiliaCause(Exception ex, Class<T> clazz) {
Throwable testEx = ex;
while (testEx != null) {
if (clazz.isAssignableFrom(testEx.getClass())) {
return (T) testEx;
}
testEx = testEx.getCause();
}
return null;
}
@Override
public V getNonBlocking(long timeout, TimeUnit timeoutUnit) throws NetxiliaResourceException,
NetxiliaBusinessException {
try {
return get(timeout, timeoutUnit);
} catch (InterruptedException e) {
throw new IncompleteTaskException(e);
} catch (ExecutionException e) {
NetxiliaBusinessException nbe = getNetxiliaCause(e, NetxiliaBusinessException.class);
if (nbe != null) {
throw nbe;
}
NetxiliaResourceException nre = getNetxiliaCause(e, NetxiliaResourceException.class);
if (nre != null) {
throw nre;
}
throw new NetxiliaResourceException(e);
} catch (TimeoutException e) {
throw new IncompleteTaskException(e);
}
}
@Override
protected ListenableFuture<V> delegate() {
return googleDelegate;
}
}