| /** |
| * 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.impl; |
| |
| import java.util.Map; |
| |
| import org.apache.camel.CamelContext; |
| import org.apache.camel.Endpoint; |
| import org.apache.camel.Exchange; |
| import org.apache.camel.FailedToCreateConsumerException; |
| import org.apache.camel.IsSingleton; |
| import org.apache.camel.PollingConsumer; |
| import org.apache.camel.util.CamelContextHelper; |
| import org.apache.camel.util.LRUCache; |
| import org.apache.camel.util.LRUSoftCache; |
| import org.apache.camel.util.ServiceHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Cache containing created {@link org.apache.camel.Consumer}. |
| * |
| * @version |
| */ |
| public class ConsumerCache extends ServiceSupport { |
| private static final transient Logger LOG = LoggerFactory.getLogger(ConsumerCache.class); |
| private final CamelContext camelContext; |
| private final Map<String, PollingConsumer> consumers; |
| private final Object source; |
| |
| public ConsumerCache(Object source, CamelContext camelContext) { |
| this(source, camelContext, CamelContextHelper.getMaximumCachePoolSize(camelContext)); |
| } |
| |
| public ConsumerCache(Object source, CamelContext camelContext, int cacheSize) { |
| this(source, camelContext, createLRUCache(cacheSize)); |
| } |
| |
| public ConsumerCache(Object source, CamelContext camelContext, Map<String, PollingConsumer> cache) { |
| this.camelContext = camelContext; |
| this.consumers = cache; |
| this.source = source; |
| } |
| |
| /** |
| * Creates the {@link LRUCache} to be used. |
| * <p/> |
| * This implementation returns a {@link org.apache.camel.util.LRUSoftCache} instance. |
| |
| * @param cacheSize the cache size |
| * @return the cache |
| */ |
| protected static LRUCache<String, PollingConsumer> createLRUCache(int cacheSize) { |
| // We use a soft reference cache to allow the JVM to re-claim memory if it runs low on memory. |
| return new LRUSoftCache<String, PollingConsumer>(cacheSize); |
| } |
| |
| public synchronized PollingConsumer getConsumer(Endpoint endpoint) { |
| String key = endpoint.getEndpointUri(); |
| PollingConsumer answer = consumers.get(key); |
| if (answer == null) { |
| try { |
| answer = endpoint.createPollingConsumer(); |
| answer.start(); |
| } catch (Exception e) { |
| throw new FailedToCreateConsumerException(endpoint, e); |
| } |
| |
| boolean singleton = true; |
| if (answer instanceof IsSingleton) { |
| singleton = ((IsSingleton) answer).isSingleton(); |
| } |
| |
| if (singleton) { |
| LOG.debug("Adding to consumer cache with key: {} for consumer: {}", endpoint, answer); |
| consumers.put(key, answer); |
| } else { |
| LOG.debug("Consumer for endpoint: {} is not singleton and thus not added to consumer cache", key); |
| } |
| } |
| return answer; |
| } |
| |
| public Exchange receive(Endpoint endpoint) { |
| LOG.debug("<<<< {}", endpoint); |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receive(); |
| } |
| |
| public Exchange receive(Endpoint endpoint, long timeout) { |
| LOG.debug("<<<< {}", endpoint); |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receive(timeout); |
| } |
| |
| public Exchange receiveNoWait(Endpoint endpoint) { |
| LOG.debug("<<<< {}", endpoint); |
| |
| PollingConsumer consumer = getConsumer(endpoint); |
| return consumer.receiveNoWait(); |
| } |
| |
| public CamelContext getCamelContext() { |
| return camelContext; |
| } |
| |
| /** |
| * Gets the source which uses this cache |
| * |
| * @return the source |
| */ |
| public Object getSource() { |
| return source; |
| } |
| |
| /** |
| * Returns the current size of the cache |
| * |
| * @return the current size |
| */ |
| public int size() { |
| int size = consumers.size(); |
| LOG.trace("size = {}", size); |
| return size; |
| } |
| |
| /** |
| * Gets the maximum cache size (capacity). |
| * <p/> |
| * Will return <tt>-1</tt> if it cannot determine this if a custom cache was used. |
| * |
| * @return the capacity |
| */ |
| public int getCapacity() { |
| int capacity = -1; |
| if (consumers instanceof LRUCache) { |
| LRUCache cache = (LRUCache) consumers; |
| capacity = cache.getMaxCacheSize(); |
| } |
| return capacity; |
| } |
| |
| /** |
| * Gets the cache hits statistic |
| * <p/> |
| * Will return <tt>-1</tt> if it cannot determine this if a custom cache was used. |
| * |
| * @return the hits |
| */ |
| public long getHits() { |
| long hits = -1; |
| if (consumers instanceof LRUCache) { |
| LRUCache cache = (LRUCache) consumers; |
| hits = cache.getHits(); |
| } |
| return hits; |
| } |
| |
| /** |
| * Gets the cache misses statistic |
| * <p/> |
| * Will return <tt>-1</tt> if it cannot determine this if a custom cache was used. |
| * |
| * @return the misses |
| */ |
| public long getMisses() { |
| long misses = -1; |
| if (consumers instanceof LRUCache) { |
| LRUCache cache = (LRUCache) consumers; |
| misses = cache.getMisses(); |
| } |
| return misses; |
| } |
| |
| /** |
| * Resets the cache statistics |
| */ |
| public void resetCacheStatistics() { |
| if (consumers instanceof LRUCache) { |
| LRUCache cache = (LRUCache) consumers; |
| cache.resetStatistics(); |
| } |
| } |
| |
| /** |
| * Purges this cache |
| */ |
| public synchronized void purge() { |
| consumers.clear(); |
| } |
| |
| @Override |
| public String toString() { |
| return "ConsumerCache for source: " + source + ", capacity: " + getCapacity(); |
| } |
| |
| protected void doStart() throws Exception { |
| ServiceHelper.startServices(consumers); |
| } |
| |
| protected void doStop() throws Exception { |
| ServiceHelper.stopServices(consumers); |
| consumers.clear(); |
| } |
| |
| } |