Example usage for com.mongodb Bytes QUERYOPTION_TAILABLE

Introduction

In this page you can find the example usage for com.mongodb Bytes QUERYOPTION_TAILABLE.

Prototype

int QUERYOPTION_TAILABLE

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Document

Tailable means cursor is not closed when the last data is retrieved.

Usage

From source file:HAL.libraries.blackboard_client.OplogMonitorThread.java

License:Open Source License

/**
 * Constructs a tailed cursor for the specified query on the oplog collection.
 * This constructor should be used when user authentication is required.
 * /*from   w  ww .  j  av  a 2 s. c  om*/
 * @param mongo The Mongo database connection that should be used.
 * @param oplogDBName The database in which the oplog collection resides.
 * @param oplogCollectionName The name of the oplog collection.
 * @param username Username that will be used to authenticate with the oplog database. This user should have read access.
 * @param password The password belonging to the specified user.
 * @param query The query that will be used in the tailed cursor.
 **/
public OplogMonitorThread(Mongo mongo, String oplogDBName, String oplogCollectionName, String username,
        String password, DBObject query) {
    database = mongo.getDB(oplogDBName);
    database.authenticate(username, password.toCharArray());
    DBCollection collection = database.getCollection(oplogCollectionName);

    tailedCursor = collection.find(query);
    tailedCursor.addOption(Bytes.QUERYOPTION_TAILABLE);
    tailedCursor.addOption(Bytes.QUERYOPTION_AWAITDATA);
    tailedCursor.skip(tailedCursor.size());
    callbackThread = new OplogCallbackThread();
}

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From source file:org.apache.camel.component.mongodb.MongoDbTailingProcess.java

License:Apache License

private DBCursor initializeCursor() {
    Object lastVal = tailTracking.lastVal;
    // lastVal can be null if we are initializing and there is no persistence enabled
    DBCursor answer;//from  w  w  w  .j a va  2  s  .co m
    if (lastVal == null) {
        answer = dbCol.find().addOption(Bytes.QUERYOPTION_TAILABLE).addOption(Bytes.QUERYOPTION_AWAITDATA);
    } else {
        DBObject queryObj = new BasicDBObject(tailTracking.getIncreasingFieldName(),
                new BasicDBObject("$gt", lastVal));
        answer = dbCol.find(queryObj).addOption(Bytes.QUERYOPTION_TAILABLE)
                .addOption(Bytes.QUERYOPTION_AWAITDATA);
    }
    return answer;
}

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From source file:org.mongodb.demos.tailable.RealTimeAppServer.java

License:Apache License

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

    RealTimeAppServer realTimeAppServer = new RealTimeAppServer();
    DBCollection coll = realTimeAppServer.createAndGetCappedCollection("messages");

    DBCursor cur = coll.find().sort(BasicDBObjectBuilder.start("$natural", 1).get())
            .addOption(Bytes.QUERYOPTION_TAILABLE).addOption(Bytes.QUERYOPTION_AWAITDATA);

    System.out.println("== open cursor ==");

    Runnable task = () -> {/*from   w w  w . j a v a2  s . co m*/
        System.out.println("\tWaiting for events");
        while (cur.hasNext()) {
            DBObject obj = cur.next();
            System.out.println(obj);

        }
    };
    new Thread(task).start();

}

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From source file:thingynet.event.EventListener.java

License:Apache License

private void refreshCursor() {
    if (cursor != null) {
        cursor.close();/*from w w  w.j  ava  2s .c om*/
        if (cursorPollMillis > 0) {
            try {
                Thread.sleep(cursorPollMillis);
            } catch (InterruptedException e) {
                log.error("Thread was interrupted", e);
            }
        }
    }
    if (handler.getLast() == null) {
        cursor = collection.getDBCollection().find().addOption(Bytes.QUERYOPTION_TAILABLE)
                .addOption(Bytes.QUERYOPTION_AWAITDATA);
    } else {
        DBObject queryObj = new BasicDBObject("_id", new BasicDBObject("$gt", handler.getLast()));
        cursor = collection.getDBCollection().find(queryObj).addOption(Bytes.QUERYOPTION_TAILABLE)
                .addOption(Bytes.QUERYOPTION_AWAITDATA);
    }
}

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