| /** |
| * 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.camel.component.jms.reply; |
| |
| import java.util.concurrent.ConcurrentSkipListSet; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A creator which can build the JMS message selector query string to use |
| * with a shared reply-to queue, so we can select the correct messages we expect as replies. |
| */ |
| public class MessageSelectorCreator implements CorrelationListener { |
| protected static final Logger LOG = LoggerFactory.getLogger(MessageSelectorCreator.class); |
| protected final CorrelationTimeoutMap timeoutMap; |
| protected final ConcurrentSkipListSet<String> correlationIds; |
| protected volatile boolean dirty = true; |
| protected StringBuilder expression; |
| |
| public MessageSelectorCreator(CorrelationTimeoutMap timeoutMap) { |
| this.timeoutMap = timeoutMap; |
| this.timeoutMap.setListener(this); |
| // create local set of correlation ids, as its easier to keep track |
| // using the listener so we can flag the dirty flag upon changes |
| // must support concurrent access |
| this.correlationIds = new ConcurrentSkipListSet<>(); |
| } |
| |
| public synchronized String get() { |
| if (!dirty) { |
| return expression.toString(); |
| } |
| |
| expression = new StringBuilder("JMSCorrelationID='"); |
| |
| if (correlationIds.size() == 0) { |
| // no id's so use a dummy to select nothing |
| expression.append("CamelDummyJmsMessageSelector'"); |
| } else { |
| boolean first = true; |
| for (String value : correlationIds) { |
| if (!first) { |
| expression.append(" OR JMSCorrelationID='"); |
| } |
| expression.append(value).append("'"); |
| if (first) { |
| first = false; |
| } |
| } |
| } |
| |
| String answer = expression.toString(); |
| |
| dirty = false; |
| return answer; |
| } |
| |
| public void onPut(String key) { |
| dirty = true; |
| correlationIds.add(key); |
| } |
| |
| public void onRemove(String key) { |
| dirty = true; |
| correlationIds.remove(key); |
| } |
| |
| public void onEviction(String key) { |
| dirty = true; |
| correlationIds.remove(key); |
| } |
| } |