org.apache.activemq.broker.region.AbstractSubscription Maven / Gradle / Ivy
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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;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSException;
import javax.management.ObjectName;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.ConsumerId;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.DestinationFilter;
import org.apache.activemq.filter.LogicExpression;
import org.apache.activemq.filter.MessageEvaluationContext;
import org.apache.activemq.filter.NoLocalExpression;
import org.apache.activemq.selector.SelectorParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class AbstractSubscription implements Subscription {
private static final Logger LOG = LoggerFactory.getLogger(AbstractSubscription.class);
protected Broker broker;
protected ConnectionContext context;
protected ConsumerInfo info;
protected final DestinationFilter destinationFilter;
protected final CopyOnWriteArrayList destinations = new CopyOnWriteArrayList();
protected final AtomicInteger prefetchExtension = new AtomicInteger(0);
private boolean usePrefetchExtension = true;
private BooleanExpression selectorExpression;
private ObjectName objectName;
private int cursorMemoryHighWaterMark = 70;
private boolean slowConsumer;
private long lastAckTime;
private final SubscriptionStatistics subscriptionStatistics = new SubscriptionStatistics();
public AbstractSubscription(Broker broker,ConnectionContext context, ConsumerInfo info) throws InvalidSelectorException {
this.broker = broker;
this.context = context;
this.info = info;
this.destinationFilter = DestinationFilter.parseFilter(info.getDestination());
this.selectorExpression = parseSelector(info);
this.lastAckTime = System.currentTimeMillis();
}
private static BooleanExpression parseSelector(ConsumerInfo info) throws InvalidSelectorException {
BooleanExpression rc = null;
if (info.getSelector() != null) {
rc = SelectorParser.parse(info.getSelector());
}
if (info.isNoLocal()) {
if (rc == null) {
rc = new NoLocalExpression(info.getConsumerId().getConnectionId());
} else {
rc = LogicExpression.createAND(new NoLocalExpression(info.getConsumerId().getConnectionId()), rc);
}
}
if (info.getAdditionalPredicate() != null) {
if (rc == null) {
rc = info.getAdditionalPredicate();
} else {
rc = LogicExpression.createAND(info.getAdditionalPredicate(), rc);
}
}
return rc;
}
@Override
public synchronized void acknowledge(final ConnectionContext context, final MessageAck ack) throws Exception {
this.lastAckTime = System.currentTimeMillis();
subscriptionStatistics.getConsumedCount().increment();
}
@Override
public boolean matches(MessageReference node, MessageEvaluationContext context) throws IOException {
ConsumerId targetConsumerId = node.getTargetConsumerId();
if (targetConsumerId != null) {
if (!targetConsumerId.equals(info.getConsumerId())) {
return false;
}
}
try {
return (selectorExpression == null || selectorExpression.matches(context)) && this.context.isAllowedToConsume(node);
} catch (JMSException e) {
LOG.info("Selector failed to evaluate: {}", e.getMessage(), e);
return false;
}
}
@Override
public boolean isWildcard() {
return destinationFilter.isWildcard();
}
@Override
public boolean matches(ActiveMQDestination destination) {
return destinationFilter.matches(destination);
}
@Override
public void add(ConnectionContext context, Destination destination) throws Exception {
destinations.add(destination);
}
@Override
public List remove(ConnectionContext context, Destination destination) throws Exception {
destinations.remove(destination);
return Collections.EMPTY_LIST;
}
@Override
public ConsumerInfo getConsumerInfo() {
return info;
}
@Override
public void gc() {
}
@Override
public ConnectionContext getContext() {
return context;
}
public ConsumerInfo getInfo() {
return info;
}
public BooleanExpression getSelectorExpression() {
return selectorExpression;
}
@Override
public String getSelector() {
return info.getSelector();
}
@Override
public void setSelector(String selector) throws InvalidSelectorException {
ConsumerInfo copy = info.copy();
copy.setSelector(selector);
BooleanExpression newSelector = parseSelector(copy);
// its valid so lets actually update it now
info.setSelector(selector);
this.selectorExpression = newSelector;
}
@Override
public ObjectName getObjectName() {
return objectName;
}
@Override
public void setObjectName(ObjectName objectName) {
this.objectName = objectName;
}
@Override
public int getPrefetchSize() {
return info.getPrefetchSize();
}
public boolean isUsePrefetchExtension() {
return usePrefetchExtension;
}
public void setUsePrefetchExtension(boolean usePrefetchExtension) {
this.usePrefetchExtension = usePrefetchExtension;
}
public void setPrefetchSize(int newSize) {
info.setPrefetchSize(newSize);
}
@Override
public boolean isRecoveryRequired() {
return true;
}
@Override
public boolean isSlowConsumer() {
return slowConsumer;
}
public void setSlowConsumer(boolean val) {
slowConsumer = val;
}
@Override
public boolean addRecoveredMessage(ConnectionContext context, MessageReference message) throws Exception {
boolean result = false;
MessageEvaluationContext msgContext = context.getMessageEvaluationContext();
try {
Destination regionDestination = (Destination) message.getRegionDestination();
msgContext.setDestination(regionDestination.getActiveMQDestination());
msgContext.setMessageReference(message);
result = matches(message, msgContext);
if (result) {
doAddRecoveredMessage(message);
}
} finally {
msgContext.clear();
}
return result;
}
@Override
public ActiveMQDestination getActiveMQDestination() {
return info != null ? info.getDestination() : null;
}
@Override
public boolean isBrowser() {
return info != null && info.isBrowser();
}
@Override
public long getInFlightMessageSize() {
return subscriptionStatistics.getInflightMessageSize().getTotalSize();
}
@Override
public int getInFlightUsage() {
int prefetchSize = info.getPrefetchSize();
if (prefetchSize > 0) {
return (getInFlightSize() * 100) / prefetchSize;
}
return Integer.MAX_VALUE;
}
/**
* Add a destination
* @param destination
*/
public void addDestination(Destination destination) {
}
/**
* Remove a destination
* @param destination
*/
public void removeDestination(Destination destination) {
}
@Override
public int getCursorMemoryHighWaterMark(){
return this.cursorMemoryHighWaterMark;
}
@Override
public void setCursorMemoryHighWaterMark(int cursorMemoryHighWaterMark){
this.cursorMemoryHighWaterMark=cursorMemoryHighWaterMark;
}
@Override
public int countBeforeFull() {
return info.getPrefetchSize() - getDispatchedQueueSize();
}
@Override
public void unmatched(MessageReference node) throws IOException {
// only durable topic subs have something to do here
}
protected void doAddRecoveredMessage(MessageReference message) throws Exception {
add(message);
}
@Override
public long getTimeOfLastMessageAck() {
return lastAckTime;
}
public void setTimeOfLastMessageAck(long value) {
this.lastAckTime = value;
}
@Override
public long getConsumedCount(){
return subscriptionStatistics.getConsumedCount().getCount();
}
@Override
public void incrementConsumedCount(){
subscriptionStatistics.getConsumedCount().increment();
}
@Override
public void resetConsumedCount(){
subscriptionStatistics.getConsumedCount().reset();
}
@Override
public SubscriptionStatistics getSubscriptionStatistics() {
return subscriptionStatistics;
}
public void wakeupDestinationsForDispatch() {
for (Destination dest : destinations) {
dest.wakeup();
}
}
public AtomicInteger getPrefetchExtension() {
return this.prefetchExtension;
}
protected void contractPrefetchExtension(int amount) {
if (isUsePrefetchExtension() && getPrefetchSize() != 0) {
decrementPrefetchExtension(amount);
}
}
protected void expandPrefetchExtension(int amount) {
if (isUsePrefetchExtension() && getPrefetchSize() != 0) {
incrementPrefetchExtension(amount);
}
}
protected void decrementPrefetchExtension(int amount) {
while (true) {
int currentExtension = prefetchExtension.get();
int newExtension = Math.max(0, currentExtension - amount);
if (prefetchExtension.compareAndSet(currentExtension, newExtension)) {
break;
}
}
}
private void incrementPrefetchExtension(int amount) {
while (true) {
int currentExtension = prefetchExtension.get();
int newExtension = Math.max(currentExtension, currentExtension + amount);
if (prefetchExtension.compareAndSet(currentExtension, newExtension)) {
break;
}
}
}
}
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