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default value of the connectionsPerHost option has been increased to 100 from the old default value of 10 used by the superseded {@code Mongo} class.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


public class Hinting {


    public static void main(String[] args) throws UnknownHostException {


        MongoClient client = new MongoClient();
        DB db = client.getDB("test");


        BasicDBObject query = new BasicDBObject("a", 40000);
        query.append("b",40000);
        query.append("c",40000);

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import java.net.UnknownHostException;
import java.util.Arrays;


public class WriteConcernTest {
    public static void main(String[] args) throws UnknownHostException, InterruptedException {
        MongoClient client = new MongoClient(Arrays.asList(
                new ServerAddress("localhost", 27017),
                new ServerAddress("localhost", 27018),
                new ServerAddress("localhost", 27019)));


        client.setWriteConcern(WriteConcern.JOURNALED);


        DB db = client.getDB("course");
        db.setWriteConcern(WriteConcern.JOURNALED);
        DBCollection coll = db.getCollection("write.test");
        coll.setWriteConcern(WriteConcern.JOURNALED);


        coll.drop();

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import java.net.UnknownHostException;
import java.util.Arrays;


public class ReplicaSetFailoverTest {
    public static void main(String[] args) throws UnknownHostException, InterruptedException {
        MongoClient client = new MongoClient(Arrays.asList(
                new ServerAddress("localhost", 27017),
                new ServerAddress("localhost", 27018),
                new ServerAddress("localhost", 27019)));


        DBCollection test = client.getDB("course").getCollection("replica.test");
        test.drop();


        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            for (int retries = 0; retries <= 2; retries++) {
                try {

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import java.util.Arrays;


public class ReplicaSetTest {


    public static void main(String[] args) throws UnknownHostException, InterruptedException {
        MongoClient client = new MongoClient(Arrays.asList(
                new ServerAddress("localhost", 27017),
                new ServerAddress("localhost", 27018),
                new ServerAddress("localhost", 27019)));


        DBCollection test = client.getDB("course").getCollection("replica.test");
        test.drop();


        for (int i = 0; i < Integer.MAX_VALUE; i++) {
            test.insert(new BasicDBObject("_id", i));
            System.out.println("Inserted document: " + i);

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import java.net.UnknownHostException;
import java.util.Arrays;


public class ReadPreferenceTest {
    public static void main(String[] args) throws UnknownHostException, InterruptedException {
        MongoClient client = new MongoClient(Arrays.asList(
                new ServerAddress("localhost", 27017),
                new ServerAddress("localhost", 27018),
                new ServerAddress("localhost", 27019)));
        client.setReadPreference(ReadPreference.primary());


        DB db = client.getDB("course");
        db.setReadPreference(ReadPreference.primary());
        DBCollection coll = db.getCollection("write.test");
        coll.setReadPreference(ReadPreference.primaryPreferred());


        DBCursor cursor = coll.find().setReadPreference(ReadPreference.nearest());

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    public static void main(String[] args) throws IOException, ParseException {
        final String screenName = args.length > 0 ? args[0] : "10gen";


        List<DBObject> tweets = getLatestTweets(screenName);


        MongoClient client = new MongoClient();
        DBCollection tweetsCollection = client.getDB("course").getCollection("twitter");
//        tweetsCollection.drop();


        for (DBObject cur : tweets) {
            cur.put("screen_name", screenName);
            massageTweetId(cur);
            massageTweet(cur);
            tweetsCollection.update(new BasicDBObject("_id", cur.get("_id")), cur, true, false);
        }


        System.out.println("Tweet count: " + tweetsCollection.count());


        client.close();
    }

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public class GridFSTest {


    public static void main(String[] args) throws UnknownHostException, FileNotFoundException, IOException {


        MongoClient client = new MongoClient();
        DB db = client.getDB("course");
        FileInputStream inputStream = null;




        GridFS videos = new GridFS(db, "videos"); // returns GridFS bucket named "videos"

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import java.util.Arrays;
import java.util.List;


public class hw3_1 {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient mongoClient = new MongoClient();
        DB school = mongoClient.getDB("school");
        DBCollection studentsCollection = school.getCollection("students");


        DBCursor students = studentsCollection.find();


        DBObject student = null;

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import java.net.UnknownHostException;


public class HelloWorldMongoDBStyle {
    public static void main(String[] args) throws UnknownHostException {
        MongoClient client =
                new MongoClient(new ServerAddress("localhost", 27017));


        DB database = client.getDB("course");
        DBCollection collection = database.getCollection("hello");


        DBObject document = collection.findOne();
        System.out.println(document);
    }

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    public static void main(String[] args) throws UnknownHostException {
        final Configuration configuration = new Configuration();
        configuration.setClassForTemplateLoading(
                HelloWorldSparkFreemarkerStyle.class, "/");


        MongoClient client = new MongoClient(new ServerAddress("localhost", 27017));


        DB database = client.getDB("course");
        final DBCollection collection = database.getCollection("hello");




        Spark.get(new Route("/") {
            @Override

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