org.apache.whirr.service.mongodb.integration.MongoDBServiceController.java Source code

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Here is the source code for org.apache.whirr.service.mongodb.integration.MongoDBServiceController.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.mongodb.integration;

import com.mongodb.BasicDBObject;
import com.mongodb.Mongo;
import com.mongodb.ServerAddress;
import com.mongodb.WriteConcern;
import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.PropertiesConfiguration;
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.mongodb.MongoDBStandaloneClusterActionHandler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class MongoDBServiceController {

    private final String configResource;

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

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

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

    private boolean running;
    private ClusterSpec clusterSpec;
    private ClusterController controller;
    private Cluster cluster;
    private Mongo mongo;

    private MongoDBServiceController(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);

        waitForMongod();
        running = true;
    }

    private void waitForMongod() {
        LOG.info("Waiting for Mongod...");
        InetAddress mongoAddr = null;
        try {
            mongoAddr = cluster.getInstanceMatching(RolePredicates.role(MongoDBStandaloneClusterActionHandler.ROLE))
                    .getPublicAddress();
        } catch (IOException e) {
            throw new RuntimeException("Failed to acquire a Mongod instance");
        }

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

    private void getMongo(InetAddress mongoAddr) throws Exception {
        if (mongo == null || mongo.getAddress() != new ServerAddress(mongoAddr))
            mongo = new Mongo(new ServerAddress(mongoAddr));
        /**
         * Test the connection...
         */
        mongo.getDB("test").getCollection("whirr_conn_validation").save(new BasicDBObject("foo", "bar"),
                WriteConcern.SAFE);

        LOG.info("Connected to MongoDB Server. ");
    }

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

    public Mongo getMongo() {
        return mongo;
    }
}