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ReadOplog.java
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62 lines (51 loc) · 1.96 KB
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// ReadOplog.java
/**
* Copyright (C) 2008 10gen 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 examples;
import com.mongodb.*;
import org.bson.types.*;
import java.util.*;
public class ReadOplog {
public static void main(String[] args)
throws Exception {
Mongo m = new Mongo();
DB local = m.getDB( "local" );
DBCollection oplog = local.getCollection( "oplog.$main" );
DBObject last = null;
{
DBCursor lastCursor = oplog.find().sort( new BasicDBObject( "$natural" , -1 ) ).limit(1);
if ( ! lastCursor.hasNext() ){
System.out.println( "no oplog!" );
return;
}
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 );
}
}
}