ConnectionPoolCommandExecutorServiceModule.java

/**
 *
 * Copyright (C) 2009 Cloud Conscious, LLC. <info@cloudconscious.com>
 *
 * ====================================================================
 * Licensed 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.jclouds.http.pool.config;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Semaphore;
import java.util.concurrent.atomic.AtomicInteger;

import org.jclouds.http.HttpUtils;
import org.jclouds.lifecycle.config.LifeCycleModule;

import com.google.inject.AbstractModule;
import com.google.inject.Provides;

/**
 * 
 * @author Adrian Cole
 */
public abstract class ConnectionPoolCommandExecutorServiceModule<C> extends AbstractModule {

   protected void configure() {
      install(new LifeCycleModule());
      bind(AtomicInteger.class).toInstance(new AtomicInteger());// max errors
      binder().requestInjection(this);
   }

   @Provides
   // @Singleton per uri...
   public abstract BlockingQueue<C> provideAvailablePool(HttpUtils utils) throws Exception;

   /**
    * controls production and destruction of real connections.
    * <p/>
    * aquire before a new connection is created release after an error has occurred
    * 
    * @param max
    * @throws Exception
    */
   @Provides
   // @Singleton per uri...
   public Semaphore provideTotalConnectionSemaphore(HttpUtils utils) throws Exception {
      return new Semaphore(utils.getMaxConnectionsPerHost() != 0 ? utils.getMaxConnectionsPerHost()
               : utils.getMaxConnections(), true);
   }
}