org.apache.whirr.service.hama.integration.HamaServiceController.java Source code

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Here is the source code for org.apache.whirr.service.hama.integration.HamaServiceController.java

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/**
 * 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.whirr.service.hama.integration;

import java.io.IOException;
import java.util.Map.Entry;

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.hama.HamaConfiguration;
import org.apache.whirr.Cluster;
import org.apache.whirr.ClusterController;
import org.apache.whirr.ClusterSpec;
import org.apache.whirr.service.hadoop.HadoopProxy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.hama.bsp.BSPJobClient;
import org.apache.hama.bsp.ClusterStatus;

public class HamaServiceController {

    private static final Logger LOG = LoggerFactory.getLogger(HamaServiceController.class);

    private static final HamaServiceController INSTANCE = new HamaServiceController();

    public static HamaServiceController getInstance() {
        return INSTANCE;
    }

    private boolean running;
    private ClusterSpec clusterSpec;
    private ClusterController controller;
    private HadoopProxy proxy;
    private Cluster cluster;

    private HamaServiceController() {
    }

    public synchronized boolean ensureClusterRunning() throws Exception {
        if (running) {
            LOG.info("Cluster already running.");
            return false;
        } else {
            startup();
            return true;
        }
    }

    public synchronized void startup() throws Exception {
        LOG.info("Starting up cluster...");
        CompositeConfiguration config = new CompositeConfiguration();
        if (System.getProperty("config") != null) {
            config.addConfiguration(new PropertiesConfiguration(System.getProperty("config")));
        }
        config.addConfiguration(new PropertiesConfiguration("whirr-hama-test.properties"));
        clusterSpec = ClusterSpec.withTemporaryKeys(config);
        controller = new ClusterController();

        cluster = controller.launchCluster(clusterSpec);
        proxy = new HadoopProxy(clusterSpec, cluster);
        proxy.start();

        HamaConfiguration conf = getConfiguration();
        BSPJobClient client = new BSPJobClient(conf);
        waitForGroomServers(client);

        running = true;
    }

    private static void waitForGroomServers(BSPJobClient client) throws IOException {
        while (true) {
            try {
                System.out.print(".");
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                break;
            }

            ClusterStatus clusterStatus = client.getClusterStatus(true);
            int grooms = clusterStatus.getActiveGroomServerStatus().size();

            if (grooms > 0) {
                LOG.info("{} groomservers reported in. Continuing.", grooms);
                break;
            }
        }
    }

    public HamaConfiguration getConfiguration() {
        HamaConfiguration conf = new HamaConfiguration();
        for (Entry<Object, Object> entry : cluster.getConfiguration().entrySet()) {
            conf.set(entry.getKey().toString(), entry.getValue().toString());
        }
        return conf;
    }

    public synchronized void shutdown() throws IOException, InterruptedException {
        LOG.info("Shutting down cluster...");
        if (proxy != null) {
            proxy.stop();
        }
        if (controller != null) {
            controller.destroyCluster(clusterSpec);
        }
        running = false;
    }
}