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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.activemq.broker.region.cursors;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.Message;
import org.apache.activemq.usage.SystemUsage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Store based Cursor for Queues
*/
public class StoreQueueCursor extends AbstractPendingMessageCursor {
private static final Logger LOG = LoggerFactory.getLogger(StoreQueueCursor.class);
private final Broker broker;
private int pendingCount;
private final Queue queue;
private PendingMessageCursor nonPersistent;
private final QueueStorePrefetch persistent;
private boolean started;
private PendingMessageCursor currentCursor;
/**
* Construct
* @param broker
* @param queue
*/
public StoreQueueCursor(Broker broker,Queue queue) {
super((queue != null ? queue.isPrioritizedMessages():false));
this.broker=broker;
this.queue = queue;
this.persistent = new QueueStorePrefetch(queue, broker);
currentCursor = persistent;
}
public synchronized void start() throws Exception {
started = true;
super.start();
if (nonPersistent == null) {
if (broker.getBrokerService().isPersistent()) {
nonPersistent = new FilePendingMessageCursor(broker,queue.getName(),this.prioritizedMessages);
}else {
nonPersistent = new VMPendingMessageCursor(this.prioritizedMessages);
}
nonPersistent.setMaxBatchSize(getMaxBatchSize());
nonPersistent.setSystemUsage(systemUsage);
nonPersistent.setEnableAudit(isEnableAudit());
nonPersistent.setMaxAuditDepth(getMaxAuditDepth());
nonPersistent.setMaxProducersToAudit(getMaxProducersToAudit());
}
nonPersistent.setMessageAudit(getMessageAudit());
nonPersistent.start();
persistent.setMessageAudit(getMessageAudit());
persistent.start();
pendingCount = persistent.size() + nonPersistent.size();
}
public synchronized void stop() throws Exception {
started = false;
if (nonPersistent != null) {
// nonPersistent.clear();
// nonPersistent.stop();
// nonPersistent.gc();
nonPersistent.destroy();
}
persistent.stop();
persistent.gc();
super.stop();
pendingCount = 0;
}
public synchronized boolean addMessageLast(MessageReference node) throws Exception {
boolean result = true;
if (node != null) {
Message msg = node.getMessage();
if (started) {
pendingCount++;
if (!msg.isPersistent()) {
nonPersistent.addMessageLast(node);
}
}
if (msg.isPersistent()) {
result = persistent.addMessageLast(node);
}
}
return result;
}
public synchronized void addMessageFirst(MessageReference node) throws Exception {
if (node != null) {
Message msg = node.getMessage();
if (started) {
pendingCount++;
if (!msg.isPersistent()) {
nonPersistent.addMessageFirst(node);
}
}
if (msg.isPersistent()) {
persistent.addMessageFirst(node);
}
}
}
public synchronized void clear() {
pendingCount = 0;
}
public synchronized boolean hasNext() {
try {
getNextCursor();
} catch (Exception e) {
LOG.error("Failed to get current cursor ", e);
throw new RuntimeException(e);
}
return currentCursor != null ? currentCursor.hasNext() : false;
}
public synchronized MessageReference next() {
MessageReference result = currentCursor != null ? currentCursor.next() : null;
return result;
}
public synchronized void remove() {
if (currentCursor != null) {
currentCursor.remove();
}
pendingCount--;
}
public synchronized void remove(MessageReference node) {
if (!node.isPersistent()) {
nonPersistent.remove(node);
} else {
persistent.remove(node);
}
pendingCount--;
}
public synchronized void reset() {
nonPersistent.reset();
persistent.reset();
pendingCount = persistent.size() + nonPersistent.size();
}
public void release() {
nonPersistent.release();
persistent.release();
}
public synchronized int size() {
if (pendingCount < 0) {
pendingCount = persistent.size() + nonPersistent.size();
}
return pendingCount;
}
public synchronized boolean isEmpty() {
// if negative, more messages arrived in store since last reset so non empty
return pendingCount == 0;
}
/**
* Informs the Broker if the subscription needs to intervention to recover
* it's state e.g. DurableTopicSubscriber may do
*
* @see org.apache.activemq.broker.region.cursors.PendingMessageCursor
* @return true if recovery required
*/
public boolean isRecoveryRequired() {
return false;
}
/**
* @return the nonPersistent Cursor
*/
public PendingMessageCursor getNonPersistent() {
return this.nonPersistent;
}
/**
* @param nonPersistent cursor to set
*/
public void setNonPersistent(PendingMessageCursor nonPersistent) {
this.nonPersistent = nonPersistent;
}
public void setMaxBatchSize(int maxBatchSize) {
persistent.setMaxBatchSize(maxBatchSize);
if (nonPersistent != null) {
nonPersistent.setMaxBatchSize(maxBatchSize);
}
super.setMaxBatchSize(maxBatchSize);
}
public void setMaxProducersToAudit(int maxProducersToAudit) {
super.setMaxProducersToAudit(maxProducersToAudit);
if (persistent != null) {
persistent.setMaxProducersToAudit(maxProducersToAudit);
}
if (nonPersistent != null) {
nonPersistent.setMaxProducersToAudit(maxProducersToAudit);
}
}
public void setMaxAuditDepth(int maxAuditDepth) {
super.setMaxAuditDepth(maxAuditDepth);
if (persistent != null) {
persistent.setMaxAuditDepth(maxAuditDepth);
}
if (nonPersistent != null) {
nonPersistent.setMaxAuditDepth(maxAuditDepth);
}
}
public void setEnableAudit(boolean enableAudit) {
super.setEnableAudit(enableAudit);
if (persistent != null) {
persistent.setEnableAudit(enableAudit);
}
if (nonPersistent != null) {
nonPersistent.setEnableAudit(enableAudit);
}
}
@Override
public void setUseCache(boolean useCache) {
super.setUseCache(useCache);
if (persistent != null) {
persistent.setUseCache(useCache);
}
if (nonPersistent != null) {
nonPersistent.setUseCache(useCache);
}
}
@Override
public void setMemoryUsageHighWaterMark(int memoryUsageHighWaterMark) {
super.setMemoryUsageHighWaterMark(memoryUsageHighWaterMark);
if (persistent != null) {
persistent.setMemoryUsageHighWaterMark(memoryUsageHighWaterMark);
}
if (nonPersistent != null) {
nonPersistent.setMemoryUsageHighWaterMark(memoryUsageHighWaterMark);
}
}
public synchronized void gc() {
if (persistent != null) {
persistent.gc();
}
if (nonPersistent != null) {
nonPersistent.gc();
}
pendingCount = persistent.size() + nonPersistent.size();
}
public void setSystemUsage(SystemUsage usageManager) {
super.setSystemUsage(usageManager);
if (persistent != null) {
persistent.setSystemUsage(usageManager);
}
if (nonPersistent != null) {
nonPersistent.setSystemUsage(usageManager);
}
}
protected synchronized PendingMessageCursor getNextCursor() throws Exception {
if (currentCursor == null || !currentCursor.hasMessagesBufferedToDeliver()) {
currentCursor = currentCursor == persistent ? nonPersistent : persistent;
// sanity check
if (currentCursor.isEmpty()) {
currentCursor = currentCursor == persistent ? nonPersistent : persistent;
}
}
return currentCursor;
}
@Override
public boolean isCacheEnabled() {
boolean cacheEnabled = isUseCache();
if (cacheEnabled) {
if (persistent != null) {
cacheEnabled &= persistent.isCacheEnabled();
}
if (nonPersistent != null) {
cacheEnabled &= nonPersistent.isCacheEnabled();
}
setCacheEnabled(cacheEnabled);
}
return cacheEnabled;
}
@Override
public void rebase() {
persistent.rebase();
reset();
}
}