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LoggedMessageHelper.java
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LoggedMessageHelper.java
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/*
* Copyright (c) 2013, 2017 Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, 2022 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.messaging.jmq.jmsserver.persist.file;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import com.sun.messaging.jmq.io.SysMessageID;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.core.DestinationUID;
import com.sun.messaging.jmq.jmsserver.data.TransactionWorkMessage;
import com.sun.messaging.jmq.jmsserver.persist.api.Store;
import com.sun.messaging.jmq.jmsserver.util.BrokerException;
import com.sun.messaging.jmq.jmsserver.util.WaitTimeoutException;
import com.sun.messaging.jmq.util.log.Logger;
/**
* @author gsivewright
*
* This class is used to keep track of which messages have been logged to the transaction log since the last checkpoint.
*
* This info is required to check if a message removal event also needs to be logged.
*
* An unlogged message removal will not be replayed and can result in a duplicate.
*
*/
public class LoggedMessageHelper {
public static final Logger logger = Globals.getLogger();
Map<SysMessageID, SysMessageID> loggedSendsSinceLastCheckpoint = new ConcurrentHashMap<>();
Set<SysMessageID> pendingRemove = Collections.synchronizedSet(new HashSet<>());
TransactionLogManager txnLogManager;
public LoggedMessageHelper(TransactionLogManager txnLogManager) {
this.txnLogManager = txnLogManager;
}
public void preMessageRemoved(DestinationUID dstID, SysMessageID mid) throws BrokerException {
if (Store.getDEBUG()) {
String msg = getPrefix() + " preMessageRemoved() dest=" + dstID + " mid=" + mid;
logger.log(Logger.DEBUG, msg);
}
// we may need to log this event if:
// (a) message send for this message was logged after previous
// checkpoint
// (b) last ack of this message has not already been logged
// so we don't need to log if log Globals.logNonTransactedMsgAck()
// ==true
if (!TransactionLogManager.logNonTransactedMsgAck) {
if (loggedSendsSinceLastCheckpoint.containsKey(mid)) {
txnLogManager.logMsgRemoval(dstID, mid);
}
}
// we have logged th eremoval of this message so no need
// to keep track of logged send for it
loggedSendsSinceLastCheckpoint.remove(mid);
}
public void postMessageRemoved(DestinationUID dstID, SysMessageID mid) throws BrokerException {
synchronized (pendingRemove) {
boolean found = pendingRemove.remove(mid);
// this method is called on ALL message removes
// so may not find a match
if (found) {
if (Store.getDEBUG()) {
String msg = getPrefix() + " postMessageRemoved() dest=" + dstID + " id=" + mid + " pendingRemoves=" + pendingRemove.size();
logger.log(Logger.DEBUG, msg);
}
if (pendingRemove.isEmpty()) {
pendingRemove.notifyAll();
}
}
}
}
public void lastAckLogged(DestinationUID dst, SysMessageID id) {
pendingRemove.add(id);
if (Store.getDEBUG()) {
String msg = getPrefix() + " lastAckLogged() dest=" + dst + " id=" + id + " pendingRemoves=" + pendingRemove.size();
logger.log(Logger.DEBUG, msg);
}
loggedSendsSinceLastCheckpoint.remove(id);
}
public void waitForPendingRemoveCompletion(boolean nowait) throws WaitTimeoutException {
synchronized (pendingRemove) {
if (Store.getDEBUG()) {
String msg = getPrefix() + " num pendingRemove =" + pendingRemove.size();
logger.log(Logger.DEBUG, msg);
}
try {
while (!pendingRemove.isEmpty()) {
if (Store.getDEBUG()) {
String msg = getPrefix() + " waiting for " + pendingRemove.size() + " pendingRemove";
logger.log(Logger.DEBUG, msg);
}
if (nowait) {
throw new WaitTimeoutException(this.getClass().getSimpleName());
}
pendingRemove.wait(1000);
}
txnLogManager.notifyPlayToStoreCompletion();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
void messageListLogged(List<TransactionWorkMessage> twms) {
Iterator<TransactionWorkMessage> iter = twms.iterator();
while (iter.hasNext()) {
TransactionWorkMessage twm = iter.next();
messageLogged(twm);
}
}
public void messageLogged(TransactionWorkMessage twm) {
if (Store.getDEBUG()) {
String msg = getPrefix() + " messageLogged()" + twm;
logger.log(Logger.DEBUG, msg);
}
SysMessageID id = twm.getMessage().getSysMessageID();
loggedSendsSinceLastCheckpoint.put(id, id);
}
/**
* on checkpoint we can clear out list of logged messages as they will not be replayed.
*/
public void onCheckpoint() {
loggedSendsSinceLastCheckpoint.clear();
}
String getPrefix() {
return "LoggedMessageHelper: " + Thread.currentThread().getName();
}
}