/*
|
* CDDL HEADER START
|
*
|
* The contents of this file are subject to the terms of the
|
* Common Development and Distribution License, Version 1.0 only
|
* (the "License"). You may not use this file except in compliance
|
* with the License.
|
*
|
* You can obtain a copy of the license at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
|
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
|
* See the License for the specific language governing permissions
|
* and limitations under the License.
|
*
|
* When distributing Covered Code, include this CDDL HEADER in each
|
* file and include the License file at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
|
* add the following below this CDDL HEADER, with the fields enclosed
|
* by brackets "[]" replaced with your own identifying information:
|
* Portions Copyright [yyyy] [name of copyright owner]
|
*
|
* CDDL HEADER END
|
*
|
*
|
* Portions Copyright 2006-2007 Sun Microsystems, Inc.
|
*/
|
package org.opends.server.replication.server;
|
|
import com.sleepycat.je.DatabaseException;
|
|
import org.opends.server.replication.common.ChangeNumber;
|
import org.opends.server.replication.protocol.UpdateMessage;
|
import org.opends.server.replication.server.ReplicationDB.ReplServerDBCursor;
|
|
/**
|
* This class allows to iterate through the changes received from a given
|
* LDAP Server Identifier.
|
*/
|
public class ReplicationIterator
|
{
|
private UpdateMessage currentChange = null;
|
private ReplServerDBCursor cursor = null;
|
|
/**
|
* Creates a new ReplicationIterator.
|
* @param id the Identifier of the server on which the iterator applies.
|
* @param db The db where the iterator must be created.
|
* @param changeNumber The ChangeNumber after which the iterator must start.
|
* @throws Exception If there is no other change to push after change
|
* with changeNumber number.
|
* @throws DatabaseException if a database problem happened.
|
*/
|
public ReplicationIterator(
|
short id, ReplicationDB db, ChangeNumber changeNumber)
|
throws Exception, DatabaseException
|
{
|
cursor = db.openReadCursor(changeNumber);
|
if (cursor == null)
|
throw new Exception("no new change");
|
if (this.next() == false)
|
{
|
cursor.close();
|
cursor = null;
|
throw new Exception("no new change");
|
}
|
}
|
|
/**
|
* Get the UpdateMessage where the iterator is currently set.
|
* @return The UpdateMessage where the iterator is currently set.
|
*/
|
public UpdateMessage getChange()
|
{
|
return currentChange;
|
}
|
|
/**
|
* Go to the next change in the ReplicationDB or in the server Queue.
|
* @return false if the iterator is already on the last change before
|
* this call.
|
*/
|
public boolean next()
|
{
|
currentChange = cursor.next();
|
|
if (currentChange != null)
|
return true;
|
else
|
{
|
// TODO : should check here if some changes are still in the
|
// dbHandler message queue and not yet saved to the backing database
|
// if yes should get change from there from now on.
|
return false;
|
}
|
|
}
|
|
/**
|
* Release the resources and locks used by this Iterator.
|
* This method must be called when the iterator is no longer used.
|
* Failure to do it could cause DB deadlock.
|
*/
|
public void releaseCursor()
|
{
|
synchronized (this)
|
{
|
if (cursor != null)
|
{
|
cursor.close();
|
cursor = null;
|
}
|
}
|
}
|
|
/**
|
* Called by the Gc when the object is garbage collected
|
* Release the cursor in case the iterator was badly used and releaseCursor
|
* was never called.
|
*/
|
protected void finalize()
|
{
|
releaseCursor();
|
}
|
}
|
