| /** |
| * 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.spi; |
| |
| /** |
| * A service pool is like a connection pool but can pool any kind of objects. |
| * <p/> |
| * Services that is capable of being pooled should implement the marker interface |
| * {@link org.apache.camel.ServicePoolAware}. |
| * <p/> |
| * Notice the capacity is <b>per key</b> which means that each key can contain at most |
| * (the capacity) services. The pool can contain an unbounded number of keys. |
| * <p/> |
| * By default the capacity is set to 100. |
| * |
| * @version |
| */ |
| public interface ServicePool<Key, Service> { |
| |
| /** |
| * Sets the capacity, which is capacity <b>per key</b>. |
| * |
| * @param capacity the capacity per key |
| */ |
| void setCapacity(int capacity); |
| |
| /** |
| * Gets the capacity per key. |
| * |
| * @return the capacity per key |
| */ |
| int getCapacity(); |
| |
| /** |
| * Adds the given service to the pool and acquires it. |
| * |
| * @param key the key |
| * @param service the service |
| * @return the acquired service, is newer <tt>null</tt> |
| * @throws IllegalStateException if the queue is full (capacity has been reached) |
| */ |
| Service addAndAcquire(Key key, Service service); |
| |
| /** |
| * Tries to acquire the service with the given key |
| * |
| * @param key the key |
| * @return the acquired service, or <tt>null</tt> if no free in pool |
| */ |
| Service acquire(Key key); |
| |
| /** |
| * Releases the service back to the pool |
| * |
| * @param key the key |
| * @param service the service |
| */ |
| void release(Key key, Service service); |
| |
| /** |
| * Returns the current size of the pool |
| * |
| * @return the current size of the pool |
| */ |
| int size(); |
| |
| } |