summaryrefslogtreecommitdiff
path: root/java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java
diff options
context:
space:
mode:
Diffstat (limited to 'java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java')
-rw-r--r--java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java271
1 files changed, 271 insertions, 0 deletions
diff --git a/java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java b/java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java
new file mode 100644
index 0000000000..961d4ddf4c
--- /dev/null
+++ b/java/java/broker/src/org/apache/qpid/server/exchange/HeadersExchange.java
@@ -0,0 +1,271 @@
+/*
+ *
+ * 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.qpid.server.exchange;
+
+import org.apache.log4j.Logger;
+import org.apache.qpid.AMQException;
+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.AMQMessage;
+import org.apache.qpid.server.queue.AMQQueue;
+import org.apache.qpid.server.registry.ApplicationRegistry;
+
+import javax.management.JMException;
+import javax.management.NotCompliantMBeanException;
+import javax.management.openmbean.*;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+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);
+
+ 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
+ {
+ private String[] _bindingItemNames = {"Queue", "HeaderBinding"};
+ private String[] _bindingItemDescriptions = {"Queue Name", "Header attribute bindings"};
+ private String[] _bindingItemIndexNames = {"HeaderBinding"};
+ private OpenType[] _bindingItemTypes = new OpenType[2];
+
+ private CompositeType _bindingDataType = null;
+ private TabularType _bindinglistDataType = null;
+ private TabularDataSupport _bindingList = null;
+
+ @MBeanConstructor("Creates an MBean for AMQ Headers exchange")
+ public HeadersExchangeMBean() throws NotCompliantMBeanException
+ {
+ super();
+ init();
+ }
+ /**
+ * initialises the OpenType objects.
+ */
+ private void init()
+ {
+ try
+ {
+ _bindingItemTypes[0] = SimpleType.STRING;
+ _bindingItemTypes[1] = new ArrayType(1, SimpleType.STRING);
+
+ _bindingDataType = new CompositeType("QueueAndHeaderAttributesBinding",
+ "Queue name and header bindings",
+ _bindingItemNames,
+ _bindingItemDescriptions,
+ _bindingItemTypes);
+ _bindinglistDataType = new TabularType("HeaderBindings",
+ "List of queue bindings for " + getName(),
+ _bindingDataType,
+ _bindingItemIndexNames);
+ }
+ catch(OpenDataException ex)
+ {
+ //It should never occur.
+ _logger.error("OpenDataTypes could not be created.", ex);
+ throw new RuntimeException(ex);
+ }
+ }
+
+ public TabularData viewBindings()
+ throws OpenDataException
+ {
+ _bindingList = new TabularDataSupport(_bindinglistDataType);
+ for (Iterator<Registration> itr = _bindings.iterator(); itr.hasNext();)
+ {
+ Registration registration = itr.next();
+ String queueName = registration.queue.getName();
+
+ HeadersBinding headers = registration.binding;
+ Map<Object, Object> headerMappings = headers.getMappings();
+ List<String> mappingList = new ArrayList<String>();
+
+ for (Map.Entry<Object, Object> en : headerMappings.entrySet())
+ {
+ String key = en.getKey().toString();
+ String value = en.getValue().toString();
+
+ mappingList.add(key + "=" + value);
+ }
+
+ Object[] bindingItemValues = {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 JMException
+ */
+ public void createBinding(String queueName, String binding)
+ throws JMException
+ {
+ AMQQueue queue = ApplicationRegistry.getInstance().getQueueRegistry().getQueue(queueName);
+
+ if (queue == null)
+ {
+ throw new JMException("Queue \"" + queueName + "\" is not registered with the exchange.");
+ }
+
+ String[] bindings = binding.split(",");
+ FieldTable fieldTable = 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>\" ");
+ }
+ fieldTable.put(keyAndValue[0], keyAndValue[1]);
+ }
+
+ _bindings.add(new Registration(new HeadersBinding(fieldTable), queue));
+ }
+
+ } // End of MBean class
+
+ public void registerQueue(String 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(String routingKey, AMQQueue queue) throws AMQException
+ {
+ _logger.debug("Exchange " + getName() + ": Unbinding " + queue.getName());
+ _bindings.remove(new Registration(null, queue));
+ }
+
+ public void route(AMQMessage payload) throws AMQException
+ {
+ Map headers = getHeaders(payload.getContentHeaderBody());
+ if (_logger.isDebugEnabled())
+ {
+ _logger.debug("Exchange " + getName() + ": routing message with headers " + headers);
+ }
+ boolean delivered = false;
+ 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());
+ }
+ e.queue.deliver(payload);
+ delivered = true;
+ }
+ }
+ if (!delivered)
+ {
+ _logger.warn("Exchange " + getName() + ": message not routable.");
+ }
+ }
+
+ protected Map 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 (NotCompliantMBeanException ex)
+ {
+ _logger.error("Exception occured in creating the HeadersExchangeMBean", ex);
+ throw new AMQException("Exception occured in creating the HeadersExchangeMBean", ex);
+ }
+ }
+
+ 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);
+ }
+ }
+}