/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009 Sun Microsystems, Inc.
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* Portions Copyright 2011 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import static org.opends.server.loggers.debug.DebugLogger.getTracer;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.replication.common.ChangeNumber;
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import org.opends.server.replication.server.DraftCNDB.*;
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import org.opends.server.types.DebugLogLevel;
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import com.sleepycat.je.DatabaseException;
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/**
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* This class allows to iterate through the changes received from a given
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* LDAP Server Identifier.
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*/
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public class DraftCNDbIterator
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{
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private static final DebugTracer TRACER = getTracer();
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private DraftCNDBCursor draftCNDbCursor = null;
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/**
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* Creates a new ReplicationIterator.
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* All created iterator must be released by the caller using the
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* releaseCursor() method.
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*
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* @param db The db where the iterator must be created.
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* @param startDraftCN The draft CN after which the iterator
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* must start.
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* @throws Exception If there is no other change to push after change
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* with changeNumber number.
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* @throws DatabaseException If a database problem happened.
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*/
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public DraftCNDbIterator(DraftCNDB db, int startDraftCN)
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throws Exception, DatabaseException
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{
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draftCNDbCursor = db.openReadCursor(startDraftCN);
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if (draftCNDbCursor == null)
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{
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throw new Exception("no new change");
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}
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}
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/**
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* Getter for the value field (external changelog cookie).
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* @return The value field (external changelog cookie).
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*/
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public String getValue()
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{
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try
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{
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return this.draftCNDbCursor.currentValue();
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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return null;
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}
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}
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/**
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* Getter for the serviceID field.
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* @return The service ID.
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*/
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public String getServiceID()
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{
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try
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{
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return this.draftCNDbCursor.currentServiceID();
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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return null;
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}
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}
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/**
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* Getter for the replication change number field.
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* @return The replication change number field.
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*/
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public ChangeNumber getChangeNumber()
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{
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try
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{
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ChangeNumber cn = this.draftCNDbCursor.currentChangeNumber();
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return cn;
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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return null;
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}
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}
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/**
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* Getter for the draftCN field.
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* @return The draft CN field.
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*/
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public int getDraftCN()
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{
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ReplicationDraftCNKey sk = (ReplicationDraftCNKey) draftCNDbCursor.getKey();
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int currentSeqnum = sk.getDraftCN();
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return currentSeqnum;
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}
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/**
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* Skip to the next record of the database.
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* @return true if has next, false elsewhere
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* @throws Exception When exception raised.
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* @throws DatabaseException When database exception raised.
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*/
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public boolean next()
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throws Exception, DatabaseException
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{
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boolean hasNext = draftCNDbCursor.next();
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if (hasNext)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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/**
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* Release the resources and locks used by this Iterator.
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* This method must be called when the iterator is no longer used.
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* Failure to do it could cause DB deadlock.
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*/
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public void releaseCursor()
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{
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synchronized (this)
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{
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if (draftCNDbCursor != null)
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{
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draftCNDbCursor.close();
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draftCNDbCursor = null;
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}
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}
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}
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/**
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* Called by the Gc when the object is garbage collected
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* Release the cursor in case the iterator was badly used and releaseCursor
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* was never called.
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*/
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protected void finalize()
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{
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releaseCursor();
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}
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}
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