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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.qpid.disttest.controller;
import java.util.Collection;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;
import org.apache.qpid.disttest.DistributedTestException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ClientRegistry
{
private static final Logger LOGGER = LoggerFactory.getLogger(ClientRegistry.class);
private final Set<String> _registeredClientNames = new ConcurrentSkipListSet<String>();
private final Object _lock = new Object();
public void registerClient(String clientName)
{
final boolean alreadyContainsClient = !_registeredClientNames.add(clientName);
if (alreadyContainsClient)
{
throw new DistributedTestException("Duplicate client name " + clientName);
}
notifyAllWaiters();
if (LOGGER.isInfoEnabled())
{
LOGGER.info("Client registered: " + clientName);
}
}
public Collection<String> getClients()
{
return Collections.unmodifiableSet(_registeredClientNames);
}
/**
* @return the number of clients that are still absent.
*/
public int awaitClients(final int numberOfClientsToAwait, final long idleTimeout)
{
long deadlineForNextRegistration = deadline(idleTimeout);
int numberOfClientsAbsent = numberAbsent(numberOfClientsToAwait);
while(numberOfClientsAbsent > 0 && System.currentTimeMillis() < deadlineForNextRegistration)
{
synchronized (_lock)
{
try
{
_lock.wait(idleTimeout);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
return numberOfClientsAbsent;
}
}
int newNumberAbsent = numberAbsent(numberOfClientsToAwait);
if(newNumberAbsent < numberOfClientsAbsent)
{
// a registration was received since the last loop, so reset the timeout
deadlineForNextRegistration = deadline(idleTimeout);
}
numberOfClientsAbsent = newNumberAbsent;
}
return numberOfClientsAbsent < 0 ? 0 : numberOfClientsAbsent;
}
private long deadline(final long idleTimeout)
{
return System.currentTimeMillis() + idleTimeout;
}
private int numberAbsent(int numberOfClientsToAwait)
{
return numberOfClientsToAwait - _registeredClientNames.size();
}
private void notifyAllWaiters()
{
synchronized (_lock)
{
_lock.notifyAll();
}
}
}
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