Examples of com.mongodb.MongoClient

com.mongodb.MongoClient
ongodb.org/display/DOCS/Replica+Sets">replica set using the Java driver by passing a ServerAddress list to the MongoClient constructor. For example:
```
 MongoClient mongoClient = new MongoClient(Arrays.asList( new ServerAddress("localhost", 27017), new ServerAddress("localhost", 27018), new ServerAddress("localhost", 27019))); 
```
You can connect to a sharded cluster using the same constructor. MongoClient will auto-detect whether the servers are a list of replica set members or a list of mongos servers.

By default, all read and write operations will be made on the primary, but it's possible to read from secondaries by changing the read preference:
```
 mongoClient.setReadPreference(ReadPreference.secondaryPreferred()); 
```
By default, all write operations will wait for acknowledgment by the server, as the default write concern is {@code WriteConcern.ACKNOWLEDGED}.

Note: This class supersedes the {@code Mongo} class. While it extends {@code Mongo}, it differs from it in that the default write concern is to wait for acknowledgment from the server of all write operations. In addition, its constructors accept instances of {@code MongoClientOptions} and {@code MongoClientURI}, which both also set the same default write concern.

In general, users of this class will pick up all of the default options specified in {@code MongoClientOptions}. In particular, note that the default value of the connectionsPerHost option has been increased to 100 from the old default value of 10 used by the superseded {@code Mongo} class.
@see ReadPreference#primary() @see com.mongodb.WriteConcern#ACKNOWLEDGED @see MongoClientOptions @see MongoClientURI @since 2.10.0

            logger.info("Starting Document{} with host={}, db={}, cache size (MB)={}, Off Heap Cache size (MB)={}",
                    new Object[] {type, mongoURI.getHosts(), db, cacheSize, offHeapCache});
            logger.info("Mongo Connection details {}", MongoConnection.toString(mongoURI.getOptions()));
        }


        MongoClient client = new MongoClient(mongoURI);
        DB mongoDB = client.getDB(db);


        mk = new DocumentMK.Builder()
                .memoryCacheSize(cacheSize * MB)
                .offHeapCacheSize(offHeapCache * MB)
                .setMongoDB(mongoDB)

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            RepositoryContext source =
                    RepositoryContext.create(RepositoryConfig.create(dir, xml));
            try {
                if (dst.startsWith("mongodb://")) {
                    MongoClientURI uri = new MongoClientURI(dst);
                    MongoClient client = new MongoClient(uri);
                    try {
                        DocumentNodeStore target = new DocumentMK.Builder()
                            .setMongoDB(client.getDB(uri.getDatabase()))
                            .getNodeStore();
                        try {
                            RepositoryUpgrade upgrade =
                                    new RepositoryUpgrade(source, target);
                            upgrade.setCopyBinariesByReference(
                                    options.has("datastore"));
                            upgrade.copy(null);
                        } finally {
                            target.dispose();
                        }
                    } finally {
                        client.close();
                    }
                } else {
                    FileStore store = new FileStore(new File(dst), 256);
                    try {
                        NodeStore target = new SegmentNodeStore(store);

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                            "'changes' collection size (MB)={}, blobCacheSize (MB)={}, maxReplicationLagInSecs={}",
                    type, mongoURI.getHosts(), db, cacheSize, offHeapCache, changesSize, blobCacheSize, maxReplicationLagInSecs);
            log.info("Mongo Connection details {}", MongoConnection.toString(mongoURI.getOptions()));
        }


        MongoClient client = new MongoClient(mongoURI);
        DB mongoDB = client.getDB(db);


        DocumentMK.Builder mkBuilder =
                new DocumentMK.Builder().
                memoryCacheSize(cacheSize * MB).
                offHeapCacheSize(offHeapCache * MB);

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                if (server != null && server.length() > 0) {
                    final int portInt = AbstractAppender.parseInt(port, 0);
                    description += ", server=" + server;
                    if (portInt > 0) {
                        description += ", port=" + portInt;
                        database = new MongoClient(server, portInt).getDB(databaseName);
                    } else {
                        database = new MongoClient(server).getDB(databaseName);
                    }
                } else {
                    database = new MongoClient().getDB(databaseName);
                }
            } catch (final Exception e) {
                LOGGER.error("Failed to obtain a database instance from the MongoClient at server [{}] and "
                        + "port [{}].", server, port);
                return null;

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     * @throws Exception If an error occurred while trying to connect.
     */
    public MongoConnection(String host, int port, String database) throws Exception {
        MongoClientOptions options = getDefaultBuilder().build();
        ServerAddress serverAddress = new ServerAddress(host, port);
        mongo = new MongoClient(serverAddress, options);
        db = mongo.getDB(database);
    }

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            logger.info("Starting MongoDB {} with host={}, db={}",
                    new Object[] {type,mongoURI.getHosts(), db});
            logger.info("Mongo Connection details {}",MongoConnection.toString(mongoURI.getOptions()));
        }


        MongoClient client = new MongoClient(mongoURI);
        DB mongoDB = client.getDB(db);


        MongoMK mk = new MongoMK.Builder()
                .memoryCacheSize(cacheSize * MB)
                .setMongoDB(mongoDB)
                .open();

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    try {


      _mongodExe = runtime.prepare(mongodConfig);
      _mongod = _mongodExe.start();


      _mongo = new MongoClient("localhost", port);
    } catch (Exception e) {
      log.error("Error starting embedded Mongodb server... tearing down test driver.");
      tearDownClass();
    }
  }

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  public void start(Map<String, Object> properties) {
    properties.keySet();
    String seeds = properties.get(Bootstrap.MONGODB_SEEDS).toString();
    try {
      if (seeds == null)
        mongoClient = new MongoClient();
      else if (seeds.contains(",")) {
        // It has multiple nodes
        StringTokenizer st = new StringTokenizer(seeds, ",");
        List<ServerAddress> addrs = new ArrayList<ServerAddress>();
        while (st.hasMoreElements()) {
          String serverName = st.nextElement().toString();
          ServerAddress server = new ServerAddress(serverName);
          addrs.add(server);
        }
        mongoClient = new MongoClient(addrs);
      } else
        mongoClient = new MongoClient(seeds);
    } catch (UnknownHostException e) {
      throw new RuntimeException(e.getMessage(), e);
    }
    String keySpace = properties.get(Bootstrap.MONGODB_KEYSPACE).toString();
    db = mongoClient.getDB(keySpace);

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                if (server != null && server.length() > 0) {
                    final int portInt = AbstractAppender.parseInt(port, 0);
                    description += ", server=" + server;
                    if (portInt > 0) {
                        description += ", port=" + portInt;
                        database = new MongoClient(server, portInt).getDB(databaseName);
                    } else {
                        database = new MongoClient(server).getDB(databaseName);
                    }
                } else {
                    database = new MongoClient().getDB(databaseName);
                }
            } catch (final Exception e) {
                LOGGER.error("Failed to obtain a database instance from the MongoClient at server [{}] and "
                        + "port [{}].", server, port);
                return null;

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        properties = new Properties();
        InputStream is = MongoDbConversionsTest.class.getResourceAsStream("/mongodb.test.properties");
        properties.load(is);
        // ping Mongo and populate db and collection
        try {
            mongo = new MongoClient(new MongoClientURI(properties.getProperty("mongodb.connectionURI")));
            mongo.getDatabaseNames();
            dbName = properties.getProperty("mongodb.testDb");
            db = mongo.getDB(dbName);
        } catch (Exception e) {
            Assume.assumeNoException(e);

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