/*
* 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.hadoop.registry.client.impl;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;
/**
* This is a little event catcher for curator asynchronous
* operations.
*/
public class CuratorEventCatcher implements BackgroundCallback {
private static final Logger LOG =
LoggerFactory.getLogger(CuratorEventCatcher.class);
public final BlockingQueue<CuratorEvent>
events = new LinkedBlockingQueue<CuratorEvent>(1);
private final AtomicInteger eventCounter = new AtomicInteger(0);
@Override
public void processResult(CuratorFramework client,
CuratorEvent event) throws
Exception {
LOG.info("received {}", event);
eventCounter.incrementAndGet();
events.put(event);
}
public int getCount() {
return eventCounter.get();
}
/**
* Blocking operation to take the first event off the queue
* @return the first event on the queue, when it arrives
* @throws InterruptedException if interrupted
*/
public CuratorEvent take() throws InterruptedException {
return events.take();
}
}