/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http.nio.command;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.hc.core5.annotation.Internal;
  import org.apache.hc.core5.concurrent.CancellableDependency;
  import org.apache.hc.core5.http.RequestNotExecutedException;
  import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
  import org.apache.hc.core5.http.nio.AsyncPushConsumer;
  import org.apache.hc.core5.http.nio.HandlerFactory;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.util.Args;
  
  /**
   * Request execution command.
   *
   * @since 5.0
   */
  @Internal
  public final class RequestExecutionCommand extends ExecutableCommand {
  
      private final AsyncClientExchangeHandler exchangeHandler;
      private final HandlerFactory<AsyncPushConsumer> pushHandlerFactory;
      private final CancellableDependency cancellableDependency;
      private final HttpContext context;
      private final AtomicBoolean failed;
  
      public RequestExecutionCommand(
              final AsyncClientExchangeHandler exchangeHandler,
              final HandlerFactory<AsyncPushConsumer> pushHandlerFactory,
              final CancellableDependency cancellableDependency,
              final HttpContext context) {
          this.exchangeHandler = Args.notNull(exchangeHandler, "Handler");
          this.pushHandlerFactory = pushHandlerFactory;
          this.cancellableDependency = cancellableDependency;
          this.context = context;
          this.failed = new AtomicBoolean();
      }
  
      public RequestExecutionCommand(
              final AsyncClientExchangeHandler exchangeHandler,
              final HandlerFactory<AsyncPushConsumer> pushHandlerFactory,
              final HttpContext context) {
          this(exchangeHandler, pushHandlerFactory, null, context);
      }
  
      public RequestExecutionCommand(
              final AsyncClientExchangeHandler exchangeHandler,
              final HttpContext context) {
          this(exchangeHandler, null, null, context);
      }
  
      public AsyncClientExchangeHandler getExchangeHandler() {
          return exchangeHandler;
      }
  
      public HandlerFactory<AsyncPushConsumer> getPushHandlerFactory() {
          return pushHandlerFactory;
      }
  
      @Override
      public CancellableDependency getCancellableDependency() {
          return cancellableDependency;
      }
  
      public HttpContext getContext() {
          return context;
      }
  
      @Override
      public void failed(final Exception ex) {
          if (failed.compareAndSet(false, true)) {
             try {
                 exchangeHandler.failed(ex);
             } finally {
                 exchangeHandler.releaseResources();
             }
         }
     }
 
     @Override
     public boolean cancel() {
         if (failed.compareAndSet(false, true)) {
             try {
                 exchangeHandler.failed(new RequestNotExecutedException());
                 return true;
             } finally {
                 exchangeHandler.releaseResources();
             }
         }
         return false;
     }
 
 }