| /** |
| * 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.ArrayList; |
| import java.util.Collection; |
| import java.util.concurrent.ArrayBlockingQueue; |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.camel.spi.ServicePool; |
| import org.apache.camel.util.ServiceHelper; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Default implementation to inherit for a basic service pool. |
| * |
| * @version |
| */ |
| public abstract class DefaultServicePool<Key, Service> extends ServiceSupport implements ServicePool<Key, Service> { |
| protected final Logger log = LoggerFactory.getLogger(getClass()); |
| protected final ConcurrentHashMap<Key, BlockingQueue<Service>> pool = new ConcurrentHashMap<Key, BlockingQueue<Service>>(); |
| protected int capacity = 100; |
| |
| protected DefaultServicePool() { |
| } |
| |
| public DefaultServicePool(int capacity) { |
| this.capacity = capacity; |
| } |
| |
| public int getCapacity() { |
| return capacity; |
| } |
| |
| public void setCapacity(int capacity) { |
| this.capacity = capacity; |
| } |
| |
| public synchronized int size() { |
| int size = 0; |
| for (BlockingQueue<Service> entry : pool.values()) { |
| size += entry.size(); |
| } |
| return size; |
| } |
| |
| public synchronized Service addAndAcquire(Key key, Service service) { |
| BlockingQueue<Service> entry = pool.get(key); |
| if (entry == null) { |
| entry = new ArrayBlockingQueue<Service>(capacity); |
| pool.put(key, entry); |
| } |
| if (log.isTraceEnabled()) { |
| log.trace("AddAndAcquire key: " + key + " service: " + service); |
| } |
| |
| // test if queue will be full |
| if (entry.size() >= capacity) { |
| throw new IllegalStateException("Queue full"); |
| } |
| return service; |
| } |
| |
| public synchronized Service acquire(Key key) { |
| BlockingQueue<Service> services = pool.get(key); |
| if (services == null || services.isEmpty()) { |
| if (log.isTraceEnabled()) { |
| log.trace("No free services in pool to acquire for key: " + key); |
| } |
| return null; |
| } |
| |
| Service answer = services.poll(); |
| if (log.isTraceEnabled()) { |
| log.trace("Acquire: " + key + " service: " + answer); |
| } |
| return answer; |
| } |
| |
| public synchronized void release(Key key, Service service) { |
| if (log.isTraceEnabled()) { |
| log.trace("Release: " + key + " service: " + service); |
| } |
| BlockingQueue<Service> services = pool.get(key); |
| if (services != null) { |
| services.add(service); |
| } |
| } |
| |
| protected void doStart() throws Exception { |
| if (log.isDebugEnabled()) { |
| log.debug("Starting service pool: " + this); |
| } |
| } |
| |
| protected void doStop() throws Exception { |
| if (log.isDebugEnabled()) { |
| log.debug("Stopping service pool: " + this); |
| } |
| for (BlockingQueue<Service> entry : pool.values()) { |
| Collection<Service> values = new ArrayList<Service>(); |
| entry.drainTo(values); |
| ServiceHelper.stopServices(values); |
| entry.clear(); |
| } |
| pool.clear(); |
| } |
| |
| } |