| /* |
| * |
| * 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.filter; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| import org.apache.qpid.common.AMQPFilterTypes; |
| import org.apache.qpid.filter.SelectorParsingException; |
| import org.apache.qpid.filter.selector.ParseException; |
| import org.apache.qpid.filter.selector.TokenMgrError; |
| import org.apache.qpid.server.model.Queue; |
| import org.apache.qpid.server.plugin.PluggableService; |
| import org.apache.qpid.server.queue.QueueConsumer; |
| |
| public class FilterSupport |
| { |
| private static final Map<String, WeakReference<JMSSelectorFilter>> _selectorCache = |
| Collections.synchronizedMap(new WeakHashMap<String, WeakReference<JMSSelectorFilter>>()); |
| |
| static MessageFilter createJMSSelectorFilter(Map<String, Object> args) throws AMQInvalidArgumentException |
| { |
| final String selectorString = (String) args.get(AMQPFilterTypes.JMS_SELECTOR.toString()); |
| return getMessageFilter(selectorString); |
| } |
| |
| |
| private static MessageFilter getMessageFilter(String selectorString) throws AMQInvalidArgumentException |
| { |
| WeakReference<JMSSelectorFilter> selectorRef = _selectorCache.get(selectorString); |
| JMSSelectorFilter selector = null; |
| |
| if(selectorRef == null || (selector = selectorRef.get())==null) |
| { |
| try |
| { |
| selector = new JMSSelectorFilter(selectorString); |
| } |
| catch (ParseException | SelectorParsingException | TokenMgrError e) |
| { |
| throw new AMQInvalidArgumentException("Cannot parse JMS selector \"" + selectorString + "\"", e); |
| } |
| _selectorCache.put(selectorString, new WeakReference<JMSSelectorFilter>(selector)); |
| } |
| return selector; |
| } |
| |
| public static boolean argumentsContainFilter(final Map<String, Object> args) |
| { |
| return argumentsContainNoLocal(args) || argumentsContainJMSSelector(args); |
| } |
| |
| |
| public static void removeFilters(final Map<String, Object> args) |
| { |
| args.remove(AMQPFilterTypes.JMS_SELECTOR.toString()); |
| args.remove(AMQPFilterTypes.NO_LOCAL.toString()); |
| } |
| |
| |
| |
| static boolean argumentsContainNoLocal(final Map<String, Object> args) |
| { |
| return args != null |
| && args.containsKey(AMQPFilterTypes.NO_LOCAL.toString()) |
| && Boolean.TRUE.equals(args.get(AMQPFilterTypes.NO_LOCAL.toString())); |
| } |
| |
| static boolean argumentsContainJMSSelector(final Map<String,Object> args) |
| { |
| return args != null && (args.get(AMQPFilterTypes.JMS_SELECTOR.toString()) instanceof String) |
| && ((String)args.get(AMQPFilterTypes.JMS_SELECTOR.toString())).trim().length() != 0; |
| } |
| |
| public static FilterManager createMessageFilter(final Map<String,Object> args, Queue<?> queue) throws AMQInvalidArgumentException |
| { |
| FilterManager filterManager = null; |
| if(argumentsContainNoLocal(args)) |
| { |
| filterManager = new FilterManager(); |
| filterManager.add(AMQPFilterTypes.NO_LOCAL.toString(), new NoLocalFilter(queue)); |
| } |
| |
| if(argumentsContainJMSSelector(args)) |
| { |
| if(filterManager == null) |
| { |
| filterManager = new FilterManager(); |
| } |
| filterManager.add(AMQPFilterTypes.JMS_SELECTOR.toString(),createJMSSelectorFilter(args)); |
| } |
| return filterManager; |
| |
| } |
| |
| @PluggableService |
| public static final class NoLocalFilter implements MessageFilter |
| { |
| private final Queue<?> _queue; |
| |
| private NoLocalFilter(Queue<?> queue) |
| { |
| _queue = queue; |
| } |
| |
| @Override |
| public String getName() |
| { |
| return AMQPFilterTypes.NO_LOCAL.toString(); |
| } |
| |
| public boolean matches(Filterable message) |
| { |
| |
| final Collection<QueueConsumer<?,?>> consumers = _queue.getConsumers(); |
| for(QueueConsumer<?,?> c : consumers) |
| { |
| if(c.getSessionModel().getConnectionReference() == message.getConnectionReference()) |
| { |
| return false; |
| } |
| } |
| return !consumers.isEmpty(); |
| } |
| |
| @Override |
| public boolean startAtTail() |
| { |
| return false; |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) |
| { |
| return true; |
| } |
| |
| if (o == null || getClass() != o.getClass()) |
| { |
| return false; |
| } |
| |
| NoLocalFilter that = (NoLocalFilter) o; |
| |
| return _queue == null ? that._queue == null : _queue.equals(that._queue); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return _queue != null ? _queue.hashCode() : 0; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "NoLocalFilter[]"; |
| } |
| } |
| |
| } |