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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*
*******************************************************************************/
package org.onap.dmaap.dmf.mr.backends.kafka;
import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import org.apache.curator.framework.CuratorFramework;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import java.util.List;
/**
*
* LockInstructionWatcher
* A package-private class used internally by the KafkaLiveLockAvoider.
*
* This class implements the zookeeper Watcher callback and listens for changes on child nodes changing.
* Each child node is actually a Kafka group name that needs to be soft polled. Deletion of the child nodes
* after soft poll unlocking is finished.
*
*
*/
public class LockInstructionWatcher implements Watcher {
private CuratorFramework curatorFramework;
private LiveLockAvoidance avoidanceCallback;
private KafkaLiveLockAvoider2 avoider;
private static final EELFLogger log = EELFManager.getInstance().getLogger(LockInstructionWatcher.class.getName());
public LockInstructionWatcher(CuratorFramework curatorFramework, LiveLockAvoidance avoidanceCallback,
KafkaLiveLockAvoider2 avoider) {
super();
this.curatorFramework = curatorFramework;
this.avoidanceCallback = avoidanceCallback;
this.avoider = avoider;
}
@Override
public void process(WatchedEvent event) {
switch (event.getType()) {
case NodeChildrenChanged:
try {
log.info("node children changed at path: {}", event.getPath());
List<String> children = curatorFramework.getChildren().forPath(event.getPath());
log.info("found children nodes prodcessing now");
for (String child : children) {
String childPath = String.format("%s/%s", event.getPath(), child);
log.info("Processing child task at node {}",childPath);
avoidanceCallback.handleRebalanceUnlock( child);
log.info("Deleting child task at node {}",childPath);
curatorFramework.delete().forPath(childPath);
}
//reset the watch with the avoider
avoider.assignNewProcessNode(avoidanceCallback.getAppId(), this);
} catch (Exception e) {
log.error("Error manipulating ZNode data in watcher",e);
}
break;
default:
log.info("Listner fired on path: {}, with event: {}", event.getPath(), event.getType());
break;
}
}
}
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