Example usage for com.mongodb ReadPreference secondaryPreferred

Introduction

In this page you can find the example usage for com.mongodb ReadPreference secondaryPreferred.

Prototype

public static ReadPreference secondaryPreferred()

Source Link

Document

Gets a read preference that forces reads to a secondary if one is available, otherwise to the primary.

Usage

From source file:test.elasticsearch.plugin.river.mongodb.RiverMongoDBTestAsbtract.java

License:Apache License

private void initMongoInstances() throws Exception {
    logger.debug("*** initMongoInstances ***");
    CommandResult cr;//from w w  w  .  java 2s .com

    // Create 3 mongod processes
    mongodConfig1 = new MongodConfig(new GenericVersion(mongoVersion),
            new Net(mongoPort1, Network.localhostIsIPv6()), new Storage(null, REPLICA_SET_NAME, 20),
            new Timeout());
    MongodStarter starter = MongodStarter.getDefaultInstance();
    mongodExe1 = starter.prepare(mongodConfig1);
    mongod1 = mongodExe1.start();
    mongodConfig2 = new MongodConfig(new GenericVersion(mongoVersion),
            new Net(mongoPort2, Network.localhostIsIPv6()), new Storage(null, REPLICA_SET_NAME, 20),
            new Timeout());
    mongodExe2 = starter.prepare(mongodConfig2);
    mongod2 = mongodExe2.start();
    mongodConfig3 = new MongodConfig(new GenericVersion(mongoVersion),
            new Net(mongoPort3, Network.localhostIsIPv6()), new Storage(null, REPLICA_SET_NAME, 20),
            new Timeout());
    mongodExe3 = starter.prepare(mongodConfig3);
    mongod3 = mongodExe3.start();
    String server1 = Network.getLocalHost().getHostName() + ":" + mongodConfig1.net().getPort();
    String server2 = Network.getLocalHost().getHostName() + ":" + mongodConfig2.net().getPort();
    String server3 = Network.getLocalHost().getHostName() + ":" + mongodConfig3.net().getPort();
    logger.debug("Server #1: {}", server1);
    logger.debug("Server #2: {}", server2);
    logger.debug("Server #3: {}", server3);
    Thread.sleep(2000);
    MongoClientOptions mco = MongoClientOptions.builder().autoConnectRetry(true).connectTimeout(15000)
            .socketTimeout(60000).build();
    mongo = new MongoClient(
            new ServerAddress(Network.getLocalHost().getHostName(), mongodConfig1.net().getPort()), mco);
    mongoAdminDB = mongo.getDB(ADMIN_DATABASE_NAME);

    cr = mongoAdminDB.command(new BasicDBObject("isMaster", 1));
    logger.debug("isMaster: " + cr);

    // Initialize replica set
    cr = mongoAdminDB.command(new BasicDBObject("replSetInitiate",
            (DBObject) JSON.parse("{'_id': '" + REPLICA_SET_NAME + "', 'members': [{'_id': 0, 'host': '"
                    + server1 + "'}, {'_id': 1, 'host': '" + server2 + "'}, {'_id': 2, 'host': '" + server3
                    + "', 'arbiterOnly' : true}]} }")));
    logger.debug("replSetInitiate: " + cr);

    Thread.sleep(5000);
    cr = mongoAdminDB.command(new BasicDBObject("replSetGetStatus", 1));
    logger.info("replSetGetStatus: " + cr);

    // Check replica set status before to proceed
    while (!isReplicaSetStarted(cr)) {
        logger.debug("Waiting for 3 seconds...");
        Thread.sleep(1000);
        cr = mongoAdminDB.command(new BasicDBObject("replSetGetStatus", 1));
        logger.debug("replSetGetStatus: " + cr);
    }

    mongo.close();
    mongo = null;

    // Initialize a new client using all instances.
    List<ServerAddress> mongoServers = new ArrayList<ServerAddress>();
    mongoServers.add(new ServerAddress(Network.getLocalHost().getHostName(), mongodConfig1.net().getPort()));
    mongoServers.add(new ServerAddress(Network.getLocalHost().getHostName(), mongodConfig2.net().getPort()));
    mongoServers.add(new ServerAddress(Network.getLocalHost().getHostName(), mongodConfig3.net().getPort()));
    mongo = new MongoClient(mongoServers, mco);
    Assert.assertNotNull(mongo);
    mongo.setReadPreference(ReadPreference.secondaryPreferred());
    mongo.setWriteConcern(WriteConcern.REPLICAS_SAFE);
}