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default value of the connectionsPerHost option has been increased to 100 from the old default value of 10 used by the superseded {@code Mongo} class.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


    @Before
    public void setUp() throws Exception {
        mongoServer = new MongoServer(new MemoryBackend());
        InetSocketAddress serverAddress = mongoServer.bind();
        client = new MongoClient(new ServerAddress(serverAddress));
        db = client.getDB("testdb");
        admin = client.getDB("admin");
        collection = db.getCollection("testcoll");
    }

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        ServerAddress serverAddress = new ServerAddress( config.getHost(), config.getPort() );
        MongoClientOptions clientOptions = config.buildOptions();


        log.connectingToMongo( config.getHost(), config.getPort(), clientOptions.getConnectTimeout() );


        this.mongo = new MongoClient( serverAddress, clientOptions );
      }
      catch ( UnknownHostException e ) {
        throw log.mongoOnUnknownHost( config.getHost() );
      }
      catch ( RuntimeException e ) {

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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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            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();
                        } 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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    @Override
    public boolean start() {


        try {
            client = new MongoClient(host, port);
        } catch (UnknownHostException e) {
            throw new RuntimeException("can't connect mongodb, please check the host and port:" + host + "," + port, e);
        }


        MongoKit.init(client, database);

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    }


    @Override
    protected void updateComponentCustom(JPanel old) {
        try {
            MongoClient mongo = getMongoNode().getMongoClient();
            setStringFieldValue(Item.version, mongo.getVersion());


            ServerAddress master = mongo.getAddress();
            if (master != null) {
                setStringFieldValue(Item.masterServer, getServerAddressString(master));
            }
            List<ServerAddress> addrs = mongo.getAllAddress();
            String html = "<html>";
            for (ServerAddress addr : addrs) {
                html += getServerAddressString(addr) + "<br/>";
            }
            html += "</html>";
            setStringFieldValue(Item.seedServers, html);


            addrs = mongo.getServerAddressList();
            html = "<html>";
            for (ServerAddress addr : addrs) {
//                String ports = MongoUtils.makeInfoString("used", mongo.getConnector().getDBPortPool(addr).inUse(),
//                        "available", mongo.getConnector().getDBPortPool(addr).available(),
//                        "created", mongo.getConnector().getDBPortPool(addr).everCreated());
                String txt = getServerAddressString(addr);
                html += txt + "<br/>";
            }
            setStringFieldValue(Item.activeServers, html);


            setStringFieldValue(Item.queryOptions, MongoUtils.queryOptionsToString(mongo.getOptions()));
            ((DocField) getBoundUnit(Item.writeConcern)).setDoc(mongo.getWriteConcern().getCommand());
            ((DocField) getBoundUnit(Item.readPreference)).setDoc(mongo.getReadPreference().toDBObject());
            setStringFieldValue(Item.maxObjectSize, String.valueOf(mongo.getMaxBsonObjectSize()));
        } catch (Exception e) {
            UMongo.instance.showError(this.getClass().getSimpleName() + " update", e);
        }
    }

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    public void close(ButtonBase button) {
        UMongo.instance.disconnect(getMongoNode());
    }


    public void readWriteOptions(ButtonBase button) {
        MongoClient mongo = getMongoNode().getMongoClient();
        OptionDialog od = UMongo.instance.getGlobalStore().getOptionDialog();
        od.update(mongo.getOptions(), mongo.getWriteConcern(), mongo.getReadPreference());
        if (!od.show()) {
            return;
        }
        mongo.setOptions(od.getQueryOptions());
        mongo.setWriteConcern(od.getWriteConcern());
        mongo.setReadPreference(od.getReadPreference());
        refresh();
    }

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        refresh();
    }


    public void createDB(ButtonBase button) {
        final String name = getStringFieldValue(Item.createDbName);
        final MongoClient mongo = getMongoNode().getMongoClient();
        // need to do a command to actually create on server
        final DB db = mongo.getDB(name);


        new DbJob() {
            @Override
            public Object doRun() throws IOException {
                db.getStats();

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            }
        }.addJob();
    }


    public void authenticate(final ButtonBase button) {
        final MongoClient mongo = getMongoNode().getMongoClient();
        final String user = getStringFieldValue(Item.authUser);
        final String passwd = getStringFieldValue(Item.authPassword);


        new DbJob() {
            @Override
            public Object doRun() throws IOException {
                mongo.getDB("admin").authenticateCommand(user, passwd.toCharArray());
                return null;
            }


            @Override
            public String getNS() {

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    public void showLog(ButtonBase button) {
        new DbJobCmd(getMongoNode().getMongoClient().getDB("admin"), new BasicDBObject("getLog", "global")).addJob();
    }


    public void cloneDB(ButtonBase button) {
        final MongoClient mongo = getMongoNode().getMongoClient();
        final String host = getStringFieldValue(Item.cloneDBHost);
        final String from = getStringFieldValue(Item.cloneDBFrom);
        final String to = getStringFieldValue(Item.cloneDBTo);
        final boolean slaveOk = getBooleanFieldValue(Item.cloneDBSlaveOk);
        final BasicDBObject cmd = new BasicDBObject("copydb", 1);
        cmd.put("fromhost", host);
        cmd.put("fromdb", from);
        if (!to.isEmpty()) {
            cmd.put("todb", to);
        }
        if (slaveOk) {
            cmd.put("slaveOk", slaveOk);
        }


        new DbJobCmd(mongo.getDB("admin"), cmd, this, null).addJob();
    }

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