com.stratio.decision.clustering.ClusterSyncManagerLeaderListener.java Source code

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Here is the source code for com.stratio.decision.clustering.ClusterSyncManagerLeaderListener.java

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/**
 * Copyright (C) 2014 Stratio (http://stratio.com)
 *
 * 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.stratio.decision.clustering;

import org.apache.curator.framework.recipes.cache.PathChildrenCache;
import org.apache.curator.framework.recipes.leader.LeaderLatchListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;

import com.stratio.decision.commons.constants.STREAMING;
import com.stratio.decision.task.FailOverTask;

/**
 * Created by josepablofernandez on 11/01/16.
 */
public class ClusterSyncManagerLeaderListener implements LeaderLatchListener {

    private static Logger logger = LoggerFactory.getLogger(ClusterSyncManagerLeaderListener.class);

    private FailOverTask failOverTask;
    private ClusterSyncManager clusterSyncManagerInstance;

    public ClusterSyncManagerLeaderListener(FailOverTask failOverTask,
            ClusterSyncManager clusterSyncManagerInstance) {

        this.clusterSyncManagerInstance = clusterSyncManagerInstance;
        this.failOverTask = failOverTask;
    }

    @Override
    public void isLeader() {

        this.initializeFailOverTask();
        this.initializeNodeStatusPathCache();

    }

    @Override
    public void notLeader() {

    }

    private void initializeFailOverTask() {

        if (failOverTask != null) {
            ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
            taskScheduler.initialize();

            taskScheduler.scheduleAtFixedRate(failOverTask, 60000);
        }

    }

    private String initializeNodeStatusPathCache() {

        if (clusterSyncManagerInstance != null) {
            try {

                PathChildrenCache cache = new PathChildrenCache(clusterSyncManagerInstance.getClient(),
                        STREAMING.ZK_EPHEMERAL_GROUPS_STATUS_BASE_PATH, true);

                cache.start(PathChildrenCache.StartMode.BUILD_INITIAL_CACHE);
                ClusterPathChildrenCacheListener listener = new ClusterPathChildrenCacheListener(
                        this.clusterSyncManagerInstance);
                cache.getListenable().addListener(listener);

                logger.info("initialized PathCache for ClusterSyncManager Leader {}",
                        clusterSyncManagerInstance.getGroupId());

                return clusterSyncManagerInstance.initializedGroupStatus();

            } catch (Exception e) {
                logger.error("PathCache for ClusterSyncManager Leader {}. Error initializing PathCache for Node "
                        + "Status Path: {}", clusterSyncManagerInstance.getGroupId(), e.getMessage());
            }
        }

        return null;

    }

}