/**
*
* Copyright 2004 Hiram Chirino
*
* 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 org.activeio.journal.active;
import org.activeio.Packet;
import EDU.oswego.cs.dl.util.concurrent.Latch;
/**
* This contains all the data needed to write and force a list of records to a
* LogFile. The more records that can be cramed into a single BatchedWrite, the
* higher throughput that can be achived by a write and force operation.
*
* @version $Revision: 1.1 $
*/
final public class BatchedWrite {
private final Packet packet;
public Throwable error;
private Location mark;
private boolean appendDisabled = false;
private boolean appendInProgress = false;
private Latch writeDoneLatch;
/**
* @param packet
*/
public BatchedWrite(Packet packet) {
this.packet = packet;
}
/**
* @throws InterruptedException
*
*/
synchronized private void disableAppend() throws InterruptedException {
appendDisabled = true;
while (appendInProgress) {
wait();
}
}
/**
* @param packet2
* @param mark2
* @return
*/
public boolean append(Record record, Location recordMark, boolean force) {
synchronized (this) {
if (appendDisabled)
return false;
appendInProgress = true;
}
if( force && writeDoneLatch==null)
writeDoneLatch = new Latch();
record.read(packet);
// if we fit the record in this batch
if ( !record.hasRemaining() ) {
if (recordMark != null)
mark = recordMark;
}
synchronized (this) {
appendInProgress = false;
this.notify();
if (appendDisabled)
return false;
else
return packet.remaining() > 0;
}
}
public void waitForForce() throws Throwable {
if( writeDoneLatch!=null ) {
writeDoneLatch.acquire();
synchronized (this) {
if (error != null)
throw error;
}
}
}
public void forced() {
if( writeDoneLatch!=null ) {
writeDoneLatch.release();
}
}
public void writeFailed(Throwable error) {
if( writeDoneLatch!=null ) {
synchronized (this) {
this.error = error;
}
writeDoneLatch.release();
}
}
public Packet getPacket() {
return packet;
}
/**
* @return
*/
public Location getMark() {
return mark;
}
/**
* @throws InterruptedException
*
*/
public void flip() throws InterruptedException {
disableAppend();
packet.flip();
}
public boolean getForce() {
return writeDoneLatch!=null;
}
}