001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.processor.aggregate; 018 019import java.util.Collections; 020import java.util.Set; 021import java.util.concurrent.ConcurrentHashMap; 022import java.util.concurrent.ConcurrentMap; 023 024import org.apache.camel.CamelContext; 025import org.apache.camel.Exchange; 026import org.apache.camel.spi.OptimisticLockingAggregationRepository; 027import org.apache.camel.support.ServiceSupport; 028 029/** 030 * A memory based {@link org.apache.camel.spi.AggregationRepository} which stores {@link Exchange}s in memory only. 031 * 032 * Supports both optimistic locking and non-optimistic locking modes. Defaults to non-optimistic locking mode. 033 * 034 * @version 035 */ 036public class MemoryAggregationRepository extends ServiceSupport implements OptimisticLockingAggregationRepository { 037 private final ConcurrentMap<String, Exchange> cache = new ConcurrentHashMap<String, Exchange>(); 038 private final boolean optimisticLocking; 039 040 public MemoryAggregationRepository() { 041 this(false); 042 } 043 044 public MemoryAggregationRepository(boolean optimisticLocking) { 045 this.optimisticLocking = optimisticLocking; 046 } 047 048 public Exchange add(CamelContext camelContext, String key, Exchange oldExchange, Exchange newExchange) { 049 if (!optimisticLocking) { throw new UnsupportedOperationException(); } 050 if (oldExchange == null) { 051 if (cache.putIfAbsent(key, newExchange) != null) { 052 throw new OptimisticLockingException(); 053 } 054 } else { 055 if (!cache.replace(key, oldExchange, newExchange)) { 056 throw new OptimisticLockingException(); 057 } 058 } 059 return oldExchange; 060 } 061 062 public Exchange add(CamelContext camelContext, String key, Exchange exchange) { 063 if (optimisticLocking) { throw new UnsupportedOperationException(); } 064 return cache.put(key, exchange); 065 } 066 067 public Exchange get(CamelContext camelContext, String key) { 068 return cache.get(key); 069 } 070 071 public void remove(CamelContext camelContext, String key, Exchange exchange) { 072 if (optimisticLocking) { 073 if (!cache.remove(key, exchange)) { 074 throw new OptimisticLockingException(); 075 } 076 } else { 077 cache.remove(key); 078 } 079 } 080 081 public void confirm(CamelContext camelContext, String exchangeId) { 082 // noop 083 } 084 085 public Set<String> getKeys() { 086 // do not allow edits to the set 087 return Collections.unmodifiableSet(cache.keySet()); 088 } 089 090 @Override 091 protected void doStart() throws Exception { 092 } 093 094 @Override 095 protected void doStop() throws Exception { 096 cache.clear(); 097 } 098 099}