org.apache.whirr.service.hbase.integration.HBaseServiceController.java Source code

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Here is the source code for org.apache.whirr.service.hbase.integration.HBaseServiceController.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.hbase.integration;

import java.io.IOException;
import java.net.InetAddress;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.thrift.generated.Hbase;
import org.apache.hadoop.hbase.thrift.generated.IOError;
import org.apache.hadoop.hbase.thrift.generated.IllegalArgument;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.protocol.TProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
import org.apache.whirr.Cluster;
import org.apache.whirr.ClusterController;
import org.apache.whirr.ClusterSpec;
import org.apache.whirr.RolePredicates;
import org.apache.whirr.service.hadoop.HadoopProxy;
import org.apache.whirr.service.hbase.HBaseThriftServerClusterActionHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HBaseServiceController {

    private final String configResource;

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

    private static final Map<String, HBaseServiceController> INSTANCES = new HashMap<String, HBaseServiceController>();

    public static HBaseServiceController getInstance(String configResource) {
        HBaseServiceController controller = INSTANCES.get(configResource);
        if (controller == null) {
            controller = new HBaseServiceController(configResource);
            INSTANCES.put(configResource, controller);
        }
        return controller;
    }

    private boolean running;
    private ClusterSpec clusterSpec;
    private ClusterController controller;
    private HadoopProxy proxy;
    private Cluster cluster;
    private Hbase.Client thriftClient;

    private HBaseServiceController(String configResource) {
        this.configResource = configResource;
    }

    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(this.configResource));
        clusterSpec = ClusterSpec.withTemporaryKeys(config);
        controller = new ClusterController();

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

        waitForMaster();
        running = true;
    }

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

    private void waitForMaster() throws IOException, TException, IOError, IllegalArgument {
        LOG.info("Waiting for master...");
        InetAddress thriftAddress = cluster
                .getInstanceMatching(RolePredicates.role(HBaseThriftServerClusterActionHandler.ROLE))
                .getPublicAddress();

        while (true) {
            try {
                getScanner(thriftAddress);
                break;
            } catch (Exception e) {
                try {
                    System.out.print(".");
                    Thread.sleep(1000);
                } catch (InterruptedException ex) {
                    break;
                }
            }
        }
        System.out.println();
        LOG.info("Master reported in. Continuing.");
    }

    private void getScanner(InetAddress thriftAddress) throws Exception {
        TTransport transport = new TSocket(thriftAddress.getHostName(), HBaseThriftServerClusterActionHandler.PORT);
        transport.open();
        LOG.info("Connected to thrift server.");
        LOG.info("Waiting for .META. table...");
        TProtocol protocol = new TBinaryProtocol(transport, true, true);
        Hbase.Client client = new Hbase.Client(protocol);
        int scannerId = client.scannerOpen(HConstants.META_TABLE_NAME, Bytes.toBytes(""), null);
        client.scannerClose(scannerId);
        thriftClient = client;
    }

    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;
    }

    public Hbase.Client getThriftClient() {
        return thriftClient;
    }
}