subprojects/s4-comm/src/main/java/org/apache/s4/comm/tools/TaskSetup.java

/**
 * 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.s4.comm.tools;

import java.util.concurrent.TimeUnit;

import org.I0Itec.zkclient.exception.ZkException;
import org.apache.s4.comm.topology.ZNRecord;
import org.apache.s4.comm.topology.ZNRecordSerializer;
import org.apache.s4.comm.topology.ZkClient;
import org.apache.helix.HelixAdmin;
import org.apache.helix.manager.zk.ZKHelixAdmin;
import org.apache.helix.model.InstanceConfig;
import org.apache.helix.model.StateModelDefinition;
import org.apache.helix.tools.StateModelConfigGenerator;

/**
 * Used for defining and dimensioning logical clusters in Zookeeper.
 * 
 */
public class TaskSetup {

    private ZkClient zkclient;
    private boolean isHelixEnabled = true;
    private HelixAdmin helixAdmin;
    org.apache.helix.manager.zk.ZkClient helixZkClient;

    public TaskSetup(String zookeeperAddress) {
        if (isHelixEnabled) {
            helixAdmin = new ZKHelixAdmin(zookeeperAddress);
        } else {
            zkclient = new ZkClient(zookeeperAddress);
            zkclient.setZkSerializer(new ZNRecordSerializer());
            if (!zkclient.waitUntilConnected(10, TimeUnit.SECONDS)) {
                throw new RuntimeException("Could not connect to ZooKeeper after 10 seconds.");
            }
        }
    }

    public void clean(String clusterName) {
        if (isHelixEnabled) {
            helixAdmin.dropCluster(clusterName);
        } else {
            zkclient.deleteRecursive("/s4/clusters/" + clusterName);
        }
    }

    public void setup(String cluster, int tasks, int initialPort) {
        if (isHelixEnabled) {
            helixAdmin.addCluster(cluster, false);
            StateModelDefinition onlineofflinemodel = new StateModelDefinition(
                    new StateModelConfigGenerator().generateConfigForOnlineOffline());
            StateModelDefinition leaderstandbymodel = new StateModelDefinition(
                    new StateModelConfigGenerator().generateConfigForLeaderStandby());

            helixAdmin.addStateModelDef(cluster, "OnlineOffline", onlineofflinemodel);
            helixAdmin.addStateModelDef(cluster, "LeaderStandby", leaderstandbymodel);

            for (int i = 0; i < tasks; i++) {
                InstanceConfig instanceConfig = new InstanceConfig("localhost_" + initialPort);
                instanceConfig.setHostName("localhost");
                instanceConfig.setPort("" + initialPort);
                helixAdmin.addInstance(cluster, instanceConfig);
                initialPort = initialPort + 1;
            }

            return;
        }
        try {
            zkclient.createPersistent("/s4/streams", true);
        } catch (ZkException ignored) {
            // ignore if exists
        }

        zkclient.createPersistent("/s4/clusters/" + cluster + "/tasks", true);
        zkclient.createPersistent("/s4/clusters/" + cluster + "/process", true);
        zkclient.createPersistent("/s4/clusters/" + cluster + "/app", true);
        for (int i = 0; i < tasks; i++) {
            String taskId = "Task-" + i;
            ZNRecord record = new ZNRecord(taskId);
            record.putSimpleField("taskId", taskId);
            record.putSimpleField("port", String.valueOf(initialPort + i));
            record.putSimpleField("partition", String.valueOf(i));
            record.putSimpleField("cluster", cluster);
            zkclient.createPersistent("/s4/clusters/" + cluster + "/tasks/" + taskId, record);
        }
    }

    public void disconnect() {
        if (isHelixEnabled) {
            helixZkClient.close();
        } else {
            zkclient.close();
        }
    }

}