/*
* Copyright 2012 Bill La Forge
*
* This file is part of AgileWiki and is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License (LGPL) as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* or navigate to the following url http://www.gnu.org/licenses/lgpl-2.1.txt
*
* Note however that only Scala, Java and JavaScript files are being covered by LGPL.
* All other files are covered by the Common Public License (CPL).
* A copy of this license is also included and can be
* found as well at http://www.opensource.org/licenses/cpl1.0.txt
*/
package org.agilewiki.jfile.transactions;
import org.agilewiki.jactor.RP;
import org.agilewiki.jfile.JFile;
import org.agilewiki.jfile.block.Block;
/**
* Durably (fsync'd/forced) logs blocks of transactions.
*/
final public class DurableTransactionLogger extends JFile implements BlockProcessor {
private BlockFlowBuffer blockFlowBuffer;
public long currentPosition;
/**
* Creates a buffered connection to the block processor that is next in the pipeline.
*
* @param nextInPipeline The next block processor in the pipeline.
*/
public void setNext(BlockProcessor nextInPipeline)
throws Exception {
blockFlowBuffer = new BlockFlowBuffer();
blockFlowBuffer.initialize(getMailboxFactory().createMailbox());
blockFlowBuffer.next = nextInPipeline;
}
public void finish(RP rp)
throws Exception {
Finish.req.send(this, blockFlowBuffer, rp);
}
public void processBlock(ProcessBlock req, RP rp) throws Exception {
Block block = req.block;
block.setFileName(getFileName());
block.setCurrentPosition(currentPosition);
forcedWriteRootJid(block, -1);
currentPosition = block.getCurrentPosition();
req.send(DurableTransactionLogger.this, blockFlowBuffer, rp);
}
}