/*
* Copyright 2013, The Sporting Exchange Limited
*
* Licensed 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 com.betfair.cougar.util;
import com.betfair.platform.virtualheap.Heap;
import com.betfair.platform.virtualheap.HeapListener;
import com.betfair.platform.virtualheap.NodeType;
import com.betfair.platform.virtualheap.updates.Update;
import com.betfair.platform.virtualheap.updates.UpdateBlock;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
public class ConnectedObjectUtils {
public static boolean waitForRootInstall(Heap heap, long timeoutMillis) {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicBoolean result = new AtomicBoolean(false);
// adds the listener first
HeapListener listener = new HeapListener() {
@Override
public void applyUpdate(UpdateBlock update) {
for (Update u : update.list()) {
if (u.getUpdateType() == Update.UpdateType.INSTALL_ROOT) {
result.set(true);
}
}
if (result.get()) {
latch.countDown();
}
}
};
heap.addListener(listener, false);
// since that was an atomic operation, we can now check if we missed out whilst waiting to add the listener:
if (heap.isRootInstalled()) {
heap.removeListener(listener);
return true;
}
// right, didn't appear to be there, so now we just wait as long as we've been asked for it to turn up..
try {
latch.await(timeoutMillis, TimeUnit.MILLISECONDS);
return result.get();
}
catch (InterruptedException ie) {
return result.get();
}
finally {
heap.removeListener(listener);
}
}
}