org.apache.activemq.broker.region.cursors.TopicStorePrefetch Maven / Gradle / Ivy
/**
* 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.region.MessageReference;
import org.apache.activemq.broker.region.Subscription;
import org.apache.activemq.broker.region.Topic;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.filter.MessageEvaluationContext;
import org.apache.activemq.filter.NonCachedMessageEvaluationContext;
import org.apache.activemq.store.TopicMessageStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* persist pendingCount messages pendingCount message (messages awaiting disptach
* to a consumer) cursor
*
*
*/
class TopicStorePrefetch extends AbstractStoreCursor {
private static final Logger LOG = LoggerFactory.getLogger(TopicStorePrefetch.class);
private final TopicMessageStore store;
private final String clientId;
private final String subscriberName;
private final Subscription subscription;
private byte lastRecoveredPriority = 9;
private boolean storeHasMessages = false;
/**
* @param topic
* @param clientId
* @param subscriberName
*/
public TopicStorePrefetch(Subscription subscription,Topic topic, String clientId, String subscriberName) {
super(topic);
this.subscription=subscription;
this.store = (TopicMessageStore)topic.getMessageStore();
this.clientId = clientId;
this.subscriberName = subscriberName;
this.maxProducersToAudit=32;
this.maxAuditDepth=10000;
resetSize();
this.storeHasMessages=this.size > 0;
}
@Override
public boolean recoverMessageReference(MessageId messageReference) throws Exception {
// shouldn't get called
throw new RuntimeException("Not supported");
}
@Override
public synchronized void addMessageFirst(MessageReference node) throws Exception {
batchList.addMessageFirst(node);
size++;
node.incrementReferenceCount();
}
@Override
public final synchronized boolean addMessageLast(MessageReference node) throws Exception {
this.storeHasMessages = super.addMessageLast(node);
return this.storeHasMessages;
}
@Override
public synchronized boolean recoverMessage(Message message, boolean cached) throws Exception {
LOG.trace("{} recover: {}, priority: {}", this, message.getMessageId(), message.getPriority());
boolean recovered = false;
MessageEvaluationContext messageEvaluationContext = new NonCachedMessageEvaluationContext();
messageEvaluationContext.setMessageReference(message);
if (this.subscription.matches(message, messageEvaluationContext)) {
recovered = super.recoverMessage(message, cached);
if (recovered && !cached) {
lastRecoveredPriority = message.getPriority();
}
storeHasMessages = true;
}
return recovered;
}
@Override
protected synchronized int getStoreSize() {
try {
return store.getMessageCount(clientId, subscriberName);
} catch (Exception e) {
LOG.error("{} Failed to get the outstanding message count from the store", this, e);
throw new RuntimeException(e);
}
}
@Override
protected synchronized long getStoreMessageSize() {
try {
return store.getMessageSize(clientId, subscriberName);
} catch (Exception e) {
LOG.error("{} Failed to get the outstanding message count from the store", this, e);
throw new RuntimeException(e);
}
}
@Override
protected synchronized boolean isStoreEmpty() {
try {
return this.store.isEmpty();
} catch (Exception e) {
LOG.error("Failed to determine if store is empty", e);
throw new RuntimeException(e);
}
}
@Override
protected void resetBatch() {
this.store.resetBatching(clientId, subscriberName);
}
@Override
protected void doFillBatch() throws Exception {
// avoid repeated trips to the store if there is nothing of interest
this.storeHasMessages = false;
this.store.recoverNextMessages(clientId, subscriberName,
maxBatchSize, this);
if (!this.storeHasMessages && (!this.batchList.isEmpty() || !hadSpace)) {
this.storeHasMessages = true;
}
}
public byte getLastRecoveredPriority() {
return lastRecoveredPriority;
}
public final boolean isPaging() {
return !isCacheEnabled() && !batchList.isEmpty();
}
@Override
public Subscription getSubscription() {
return subscription;
}
@Override
public String toString() {
return "TopicStorePrefetch(" + clientId + "," + subscriberName + ",storeHasMessages=" + this.storeHasMessages +") " + this.subscription.getConsumerInfo().getConsumerId() + " - " + super.toString();
}
}