Examples of com.mongodb.Mongo

com.mongodb.Mongo
ongodb.org/display/DOCS/Java+Driver+Concurrency
Connecting to a Replica Pair

You can connect to a replica pair using the Java driver by passing two DBAddresses to the Mongo constructor. For example:
```
 DBAddress left = new DBAddress("127.0.0.1:27017/test"); DBAddress right = new DBAddress("127.0.0.1:27018/test"); Mongo mongo = new Mongo(left, right); 
```
If the master of a replica pair goes down, there will be a brief lag before the slave becomes master. Thus, your application should be prepared to catch the exceptions that might be thrown in such a case: IllegalArgumentException, MongoException, and MongoException.Network (depending on when the connection drops).

Once the slave becomes master, the driver will begin using that connection as the master connection and the exceptions will stop being thrown.

Connecting to a Replica Set

You can connect to a replica set using the Java driver by passing several a list if ServerAddress to the Mongo constructor. For example:
```
 List addrs = new ArrayList(); addrs.add( new ServerAddress( "127.0.0.1" , 27017 ) ); addrs.add( new ServerAddress( "127.0.0.1" , 27018 ) ); addrs.add( new ServerAddress( "127.0.0.1" , 27019 ) ); Mongo mongo = new Mongo( addrs ); 
```
By default, all read and write operations will be made on the master. But it's possible to read from the slave(s) by using slaveOk:
```
 mongo.slaveOk(); 
```

        }));
    }


    public static boolean isAvailable() {
        try {
            Mongo mongo = new Mongo(HOST, PORT);
            try {
                mongo.getDatabaseNames();
                return true;
            } finally {
                mongo.close();
            }
        } catch (Exception e) {
            return false;
        }
    }

View Full Code Here

            private Mongo mongo;
            @Override
            public Repository[] setUpCluster(int n) throws Exception {
                Repository[] cluster = new Repository[n];
                stores = new SegmentStore[cluster.length];
                mongo = new Mongo(host, port);
                for (int i = 0; i < cluster.length; i++) {
                    stores[i] = new MongoStore(mongo.getDB(unique), cacheSize);
                    Oak oak = new Oak(new SegmentNodeStore(stores[i]));
                    cluster[i] = new Jcr(oak).createRepository();
                }

View Full Code Here


    @Override
    public void open() {
        try {
            if (mongo == null) {
                mongo = new Mongo(host, port);
                db = mongo.getDB(dbName);
                db.setWriteConcern(com.mongodb.WriteConcern.SAFE);
                LOG.info("opened database (" + dbName + "): " + mongo);
            } else {
                LOG.info(" using opened database " + db);

View Full Code Here


    @Before
    public void setupMongo() throws Exception {


        try {
            final Mongo m = new Mongo();
            m.dropDatabase("testdb");
            testDb = m.getDB("testdb");
        } catch (final Exception e) {
            assumeThat(true, is(false)); // ignore if no MongoDB instance to
                                         // connect to
            return;
        }

View Full Code Here


    @Before
    public void setup() throws Exception {
        org.apache.log4j.Logger.getRootLogger().setLevel(org.apache.log4j.Level.OFF);


        final Mongo m = new Mongo();
        try {
            m.dropDatabase("mydb");
        } catch (final Exception e) {
            assumeThat(true, is(false));// ie ignore test because we've had an
                                        // exception
            return;
        }


        testDb = m.getDB("mydb");


        final BasicDBObject object = new BasicDBObject();
//        object.put("_id", "1023");
//        object.put("_type", "org.xxx.Class");
        object.put("_oid", OBJECT_TYPE + ":1023");

View Full Code Here

public class DemoMongo {
    
    // @Test
    public void installed() throws Exception {


        final Mongo m = new Mongo();


        for (final String s : m.getDatabaseNames()) {
            System.out.println(s);
        }


        /*
         * Mongo m = new Mongo( "localhost" ); Mongo m = new Mongo( "localhost"
         * , 27017 );
         */
        m.dropDatabase("mydb");


        System.out.println("\n...");
        for (final String s : m.getDatabaseNames()) {
            System.out.println(s);
        }


        final DB db = m.getDB("mydb");
        /*
         * DBCollection coll = db.getCollection("testCollection1"); coll =
         * db.getCollection("testCollection2");
         */

View Full Code Here

    public void setup() throws Exception {
        org.apache.log4j.Logger.getRootLogger().setLevel(org.apache.log4j.Level.OFF);


        try {


            final Mongo m = new Mongo();
            m.dropDatabase("mydb");
            testDb = m.getDB("mydb");
        } catch (final Exception e) {
            assumeThat(true, is(false)); // ie no exceptions
            return;
        }

View Full Code Here

                }
                if (connectionSpec.getHosts().isEmpty()) {
                    ServerAddress server = new ServerAddress("localhost", ServerAddress.defaultPort());
                    servers.add(server);                    
                }
                Mongo mongo = this.mongo;
                if (mongo == null) {
                    isExternal = false;
                    if (servers.isEmpty()) {
                        mongo = new Mongo();
                    } else {
                        mongo = new Mongo(servers);
                    }
                }
                db = mongo.getDB(connectionSpec.getDB());
                if ((connectionSpec.getUser() != null) && (connectionSpec.getUser().length() > 0)) {
                    if (!db.authenticate(connectionSpec.getUser(), connectionSpec.getPassword())) {
                        throw new ResourceException("authenticate failed for user: " + connectionSpec.getUser());
                    }
                }

View Full Code Here

    public static UpdateableDataContext createMongoDbDataContext(String hostname, Integer port, String databaseName,
            String username, char[] password, SimpleTableDef[] tableDefs) {
        try {
            DB mongoDb;
            if (port == null) {
                mongoDb = new Mongo(hostname).getDB(databaseName);
            } else {
                mongoDb = new Mongo(hostname, port).getDB(databaseName);
            }
            if (username != null) {
                mongoDb.authenticate(username, password);
            }

View Full Code Here


    protected Datastore ds;


    @BeforeClass
    public void initDB() throws Exception {
        connection = new Mongo("127.0.0.1");


        morphia = new Morphia().map(MongoDBChangeSet.class).map(MongoDBChangeSetEntry.class).map(MongoDBFile.class);


        ds = morphia.createDatastore(connection, "rhqtest");
    }

View Full Code Here

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Examples of com.mongodb.Mongo

Connecting to a Replica Pair

Connecting to a Replica Set

Related Classes of com.mongodb.Mongo