/*
*
* 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.
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*/
package org.apache.qpid.server.exchange;
import org.apache.log4j.Logger;
import org.apache.qpid.AMQException;
import org.apache.qpid.protocol.AMQConstant;
import org.apache.qpid.exchange.ExchangeDefaults;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.framing.AMQTypedValue;
import org.apache.qpid.framing.BasicContentHeaderProperties;
import org.apache.qpid.framing.ContentHeaderBody;
import org.apache.qpid.framing.FieldTable;
import org.apache.qpid.server.management.MBeanConstructor;
import org.apache.qpid.server.management.MBeanDescription;
import org.apache.qpid.server.queue.IncomingMessage;
import org.apache.qpid.server.queue.AMQQueue;
import org.apache.qpid.server.virtualhost.VirtualHost;
import javax.management.JMException;
import javax.management.openmbean.ArrayType;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenDataException;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.SimpleType;
import javax.management.openmbean.TabularData;
import javax.management.openmbean.TabularDataSupport;
import javax.management.openmbean.TabularType;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Collection;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* An exchange that binds queues based on a set of required headers and header values
* and routes messages to these queues by matching the headers of the message against
* those with which the queues were bound.
* <p/>
* <pre>
* The Headers Exchange
*
* Routes messages according to the value/presence of fields in the message header table.
* (Basic and JMS content has a content header field called "headers" that is a table of
* message header fields).
*
* class = "headers"
* routing key is not used
*
* Has the following binding arguments:
*
* the X-match field - if "all", does an AND match (used for GRM), if "any", does an OR match.
* other fields prefixed with "X-" are ignored (and generate a console warning message).
* a field with no value or empty value indicates a match on presence only.
* a field with a value indicates match on field presence and specific value.
*
* Standard instances:
*
* amq.match - pub/sub on field content/value
* </pre>
*/
public class HeadersExchange extends AbstractExchange
{
private static final Logger _logger = Logger.getLogger(HeadersExchange.class);
public static final ExchangeType<HeadersExchange> TYPE = new ExchangeType<HeadersExchange>()
{
public AMQShortString getName()
{
return ExchangeDefaults.HEADERS_EXCHANGE_CLASS;
}
public Class<HeadersExchange> getExchangeClass()
{
return HeadersExchange.class;
}
public HeadersExchange newInstance(VirtualHost host, AMQShortString name, boolean durable, int ticket,
boolean autoDelete) throws AMQException
{
HeadersExchange exch = new HeadersExchange();
exch.initialise(host, name, durable, ticket, autoDelete);
return exch;
}
public AMQShortString getDefaultExchangeName()
{
return ExchangeDefaults.HEADERS_EXCHANGE_NAME;
}
};
private final List<Registration> _bindings = new CopyOnWriteArrayList<Registration>();
/**
* HeadersExchangeMBean class implements the management interface for the
* Header Exchanges.
*/
@MBeanDescription("Management Bean for Headers Exchange")
private final class HeadersExchangeMBean extends ExchangeMBean
{
@MBeanConstructor("Creates an MBean for AMQ Headers exchange")
public HeadersExchangeMBean() throws JMException
{
super();
_exchangeType = "headers";
init();
}
/**
* initialises the OpenType objects.
*/
protected void init() throws OpenDataException
{
_bindingItemNames = new String[]{"Binding No", "Queue Name", "Queue Bindings"};
_bindingItemIndexNames = new String[]{_bindingItemNames[0]};
_bindingItemTypes = new OpenType[3];
_bindingItemTypes[0] = SimpleType.INTEGER;
_bindingItemTypes[1] = SimpleType.STRING;
_bindingItemTypes[2] = new ArrayType(1, SimpleType.STRING);
_bindingDataType = new CompositeType("Exchange Binding", "Queue name and header bindings",
_bindingItemNames, _bindingItemNames, _bindingItemTypes);
_bindinglistDataType = new TabularType("Exchange Bindings", "List of exchange bindings for " + getName(),
_bindingDataType, _bindingItemIndexNames);
}
public TabularData bindings() throws OpenDataException
{
_bindingList = new TabularDataSupport(_bindinglistDataType);
int count = 1;
for (Iterator<Registration> itr = _bindings.iterator(); itr.hasNext();)
{
Registration registration = itr.next();
String queueName = registration.queue.getName().toString();
HeadersBinding headers = registration.binding;
FieldTable headerMappings = headers.getMappings();
final List<String> mappingList = new ArrayList<String>();
headerMappings.processOverElements(new FieldTable.FieldTableElementProcessor()
{
public boolean processElement(String propertyName, AMQTypedValue value)
{
mappingList.add(propertyName + "=" + value.getValue());
return true;
}
public Object getResult()
{
return mappingList;
}
});
Object[] bindingItemValues = {count++, queueName, mappingList.toArray(new String[0])};
CompositeData bindingData = new CompositeDataSupport(_bindingDataType, _bindingItemNames, bindingItemValues);
_bindingList.put(bindingData);
}
return _bindingList;
}
/**
* Creates bindings. Binding pattern is as follows-
* <attributename>=<value>,<attributename>=<value>,...
* @param queueName
* @param binding
* @throws javax.management.JMException
*/
public void createNewBinding(String queueName, String binding) throws JMException
{
AMQQueue queue = getQueueRegistry().getQueue(new AMQShortString(queueName));
if (queue == null)
{
throw new JMException("Queue \"" + queueName + "\" is not registered with the exchange.");
}
String[] bindings = binding.split(",");
FieldTable bindingMap = new FieldTable();
for (int i = 0; i < bindings.length; i++)
{
String[] keyAndValue = bindings[i].split("=");
if (keyAndValue == null || keyAndValue.length < 2)
{
throw new JMException("Format for headers binding should be \"<attribute1>=<value1>,<attribute2>=<value2>\" ");
}
bindingMap.setString(keyAndValue[0], keyAndValue[1]);
}
_bindings.add(new Registration(new HeadersBinding(bindingMap), queue));
}
} // End of MBean class
public AMQShortString getType()
{
return ExchangeDefaults.HEADERS_EXCHANGE_CLASS;
}
public void registerQueue(AMQShortString routingKey, AMQQueue queue, FieldTable args) throws AMQException
{
_logger.debug("Exchange " + getName() + ": Binding " + queue.getName() + " with " + args);
_bindings.add(new Registration(new HeadersBinding(args), queue));
}
public void deregisterQueue(AMQShortString routingKey, AMQQueue queue, FieldTable args) throws AMQException
{
_logger.debug("Exchange " + getName() + ": Unbinding " + queue.getName());
if(!_bindings.remove(new Registration(new HeadersBinding(args), queue)))
{
throw new AMQException(AMQConstant.NOT_FOUND, "Queue " + queue + " was not registered with exchange " + this.getName()
+ " with headers args " + args);
}
}
public void route(IncomingMessage payload) throws AMQException
{
FieldTable headers = getHeaders(payload.getContentHeaderBody());
if (_logger.isDebugEnabled())
{
_logger.debug("Exchange " + getName() + ": routing message with headers " + headers);
}
boolean routed = false;
ArrayList<AMQQueue> queues = new ArrayList<AMQQueue>();
for (Registration e : _bindings)
{
if (e.binding.matches(headers))
{
if (_logger.isDebugEnabled())
{
_logger.debug("Exchange " + getName() + ": delivering message with headers " +
headers + " to " + e.queue.getName());
}
queues.add(e.queue);
routed = true;
}
}
payload.enqueue(queues);
}
public boolean isBound(AMQShortString routingKey, FieldTable arguments, AMQQueue queue)
{
//fixme isBound here should take the arguements in to consideration.
return isBound(routingKey, queue);
}
public boolean isBound(AMQShortString routingKey, AMQQueue queue)
{
return isBound(queue);
}
public boolean isBound(AMQShortString routingKey)
{
return hasBindings();
}
public boolean isBound(AMQQueue queue)
{
for (Registration r : _bindings)
{
if (r.queue.equals(queue))
{
return true;
}
}
return false;
}
public boolean hasBindings()
{
return !_bindings.isEmpty();
}
protected FieldTable getHeaders(ContentHeaderBody contentHeaderFrame)
{
//what if the content type is not 'basic'? 'file' and 'stream' content classes also define headers,
//but these are not yet implemented.
return ((BasicContentHeaderProperties) contentHeaderFrame.properties).getHeaders();
}
protected ExchangeMBean createMBean() throws AMQException
{
try
{
return new HeadersExchangeMBean();
}
catch (JMException ex)
{
_logger.error("Exception occured in creating the HeadersExchangeMBean", ex);
throw new AMQException("Exception occured in creating the HeadersExchangeMBean", ex);
}
}
public Map<AMQShortString, List<AMQQueue>> getBindings()
{
return null;
}
private static class Registration
{
private final HeadersBinding binding;
private final AMQQueue queue;
Registration(HeadersBinding binding, AMQQueue queue)
{
this.binding = binding;
this.queue = queue;
}
public int hashCode()
{
return queue.hashCode();
}
public boolean equals(Object o)
{
return o instanceof Registration && ((Registration) o).queue.equals(queue);
}
}
}