/**
* 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.concurrent.CopyOnWriteArrayList;
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.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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public abstract class AbstractSubscription implements Subscription {
private static final Log LOG = LogFactory.getLog(AbstractSubscription.class);
protected Broker broker;
protected ConnectionContext context;
protected ConsumerInfo info;
protected final DestinationFilter destinationFilter;
protected final CopyOnWriteArrayList<Destination> destinations = new CopyOnWriteArrayList<Destination>();
private BooleanExpression selectorExpression;
private ObjectName objectName;
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);
}
private static BooleanExpression parseSelector(ConsumerInfo info) throws InvalidSelectorException {
BooleanExpression rc = null;
if (info.getSelector() != null) {
rc = new 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;
}
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;
}
}
public boolean matches(ActiveMQDestination destination) {
return destinationFilter.matches(destination);
}
public void add(ConnectionContext context, Destination destination) throws Exception {
destinations.add(destination);
}
public void remove(ConnectionContext context, Destination destination) throws Exception {
destinations.remove(destination);
}
public ConsumerInfo getConsumerInfo() {
return info;
}
public void gc() {
}
public boolean isSlave() {
return getContext().isSlave();
}
public ConnectionContext getContext() {
return context;
}
public ConsumerInfo getInfo() {
return info;
}
public BooleanExpression getSelectorExpression() {
return selectorExpression;
}
public String getSelector() {
return info.getSelector();
}
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;
}
public ObjectName getObjectName() {
return objectName;
}
public void setObjectName(ObjectName objectName) {
this.objectName = objectName;
}
public int getPrefetchSize() {
return info.getPrefetchSize();
}
public boolean isRecoveryRequired() {
return true;
}
public boolean addRecoveredMessage(ConnectionContext context, MessageReference message) throws Exception {
boolean result = false;
MessageEvaluationContext msgContext = context.getMessageEvaluationContext();
try {
msgContext.setDestination(message.getRegionDestination().getActiveMQDestination());
msgContext.setMessageReference(message);
result = matches(message, msgContext);
if (result) {
doAddRecoveredMessage(message);
}
} finally {
msgContext.clear();
}
return result;
}
public ActiveMQDestination getActiveMQDestination() {
return info != null ? info.getDestination() : null;
}
protected void doAddRecoveredMessage(MessageReference message) throws Exception {
add(message);
}
}