/*
* JBoss, Home of Professional Open Source
* Copyright 2009, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* 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 2.1 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.jboss.as.osgi.service;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.jboss.logging.Logger;
import org.jboss.msc.service.AbstractServiceListener;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceController.State;
import org.jboss.msc.service.StartException;
/**
* A Future that waits for the given service to come up and returns it's value.
*
* Use cautiously and only if there is no way to use direct service dependencies instead.
*
* @author thomas.diesler@jboss.com
* @since 29-Mar-2011
*/
final class FutureServiceValue<T> implements Future<T> {
private static final Logger log = Logger.getLogger(FutureServiceValue.class);
private ServiceController<T> controller;
FutureServiceValue(ServiceController<T> controller) {
this.controller = controller;
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
@Override
public boolean isCancelled() {
return false;
}
@Override
public boolean isDone() {
return controller.getState() == State.UP;
}
@Override
public T get() throws ExecutionException {
try {
return get(5, TimeUnit.SECONDS);
} catch (TimeoutException ex) {
throw new ExecutionException(ex);
}
}
@Override
public T get(long timeout, TimeUnit unit) throws ExecutionException, TimeoutException {
return getValue(timeout, unit);
}
private T getValue(long timeout, TimeUnit unit) throws ExecutionException, TimeoutException {
if (controller.getState() == State.UP)
return controller.getValue();
final CountDownLatch latch = new CountDownLatch(1);
AbstractServiceListener<T> listener = new AbstractServiceListener<T>() {
@Override
public void listenerAdded(ServiceController<? extends T> controller) {
State state = controller.getState();
if (state == State.UP || state == State.START_FAILED)
listenerDone(controller);
}
@Override
public void serviceStarted(ServiceController<? extends T> controller) {
listenerDone(controller);
}
@Override
public void serviceFailed(ServiceController<? extends T> controller, StartException reason) {
listenerDone(controller);
}
private void listenerDone(ServiceController<? extends T> controller) {
controller.removeListener(this);
latch.countDown();
}
};
controller.addListener(listener);
try {
if (latch.await(timeout, unit) == false) {
TimeoutException cause = new TimeoutException("Timeout getting " + controller.getName());
processExceptionCause(cause);
throw cause;
}
} catch (InterruptedException e) {
// ignore;
}
if (controller.getState() == State.UP)
return controller.getValue();
StartException startException = controller.getStartException();
Throwable cause = (startException != null ? startException.getCause() : null);
String message = processExceptionCause(cause);
if (cause instanceof RuntimeException)
throw (RuntimeException) cause;
if (cause instanceof ExecutionException)
throw (ExecutionException) cause;
if (cause instanceof TimeoutException)
throw (TimeoutException) cause;
throw new ExecutionException(message, cause);
}
String processExceptionCause(Throwable cause) throws ExecutionException, TimeoutException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
controller.getServiceContainer().dumpServices(new PrintStream(baos));
String message = "Cannot start " + controller.getName();
log.debugf(message + "\n%s", baos.toString());
log.errorf(message);
return message;
}
}