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/*

* Copyright (c) 2008-2014 MongoDB, Inc.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

package example;

import com.mongodb.BasicDBObject;

import com.mongodb.Bytes;

import com.mongodb.DB;

import com.mongodb.DBCollection;

import com.mongodb.DBCursor;

import com.mongodb.DBObject;

import com.mongodb.MongoClient;

import org.bson.types.BSONTimestamp;

public class ReadOplog {

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

MongoClient mongoClient = new MongoClient();

DB local = mongoClient.getDB("local");

DBCollection oplog = local.getCollection("oplog.$main");

DBCursor lastCursor = oplog.find().sort(new BasicDBObject("$natural", -1)).limit(1);

if (!lastCursor.hasNext()) {

System.out.println("no oplog!");

return;

}

DBObject last = lastCursor.next();

BSONTimestamp ts = (BSONTimestamp) last.get("ts");

System.out.println("starting point: " + ts);

while (true) {

System.out.println("starting at ts: " + ts);

DBCursor cursor = oplog.find(new BasicDBObject("ts", new BasicDBObject("$gt", ts)));

cursor.addOption(Bytes.QUERYOPTION_TAILABLE);

cursor.addOption(Bytes.QUERYOPTION_AWAITDATA);

while (cursor.hasNext()) {

DBObject x = cursor.next();

ts = (BSONTimestamp) x.get("ts");

System.out.println("\t" + x);

}

Thread.sleep(1000);

}

}

}