/*
    * ====================================================================
    * 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.http.client.methods;
  
  import java.io.IOException;
  import java.util.concurrent.locks.Lock;
  import java.util.concurrent.locks.ReentrantLock;
  
  import org.apache.http.HttpRequest;
  import org.apache.http.client.utils.CloneUtils;
  import org.apache.http.concurrent.Cancellable;
  import org.apache.http.conn.ClientConnectionRequest;
  import org.apache.http.conn.ConnectionReleaseTrigger;
  import org.apache.http.message.AbstractHttpMessage;
  
  @SuppressWarnings("deprecation")
  public abstract class AbstractExecutionAwareRequest extends AbstractHttpMessage implements
          HttpExecutionAware, AbortableHttpRequest, Cloneable, HttpRequest {
  
      private Lock abortLock;
      private volatile boolean aborted;
      private volatile Cancellable cancellable;
  
      protected AbstractExecutionAwareRequest() {
          super();
          this.abortLock = new ReentrantLock();
      }
  
      @Deprecated
      public void setConnectionRequest(final ClientConnectionRequest connRequest) {
          if (this.aborted) {
              return;
          }
          this.abortLock.lock();
          try {
              this.cancellable = new Cancellable() {
  
                  public boolean cancel() {
                      connRequest.abortRequest();
                      return true;
                  }
  
              };
          } finally {
              this.abortLock.unlock();
          }
      }
  
      @Deprecated
      public void setReleaseTrigger(final ConnectionReleaseTrigger releaseTrigger) {
          if (this.aborted) {
              return;
          }
          this.abortLock.lock();
          try {
              this.cancellable = new Cancellable() {
  
                  public boolean cancel() {
                      try {
                          releaseTrigger.abortConnection();
                          return true;
                      } catch (final IOException ex) {
                          return false;
                      }
                  }
  
              };
          } finally {
              this.abortLock.unlock();
          }
      }
  
      private void cancelExecution() {
          if (this.cancellable != null) {
              this.cancellable.cancel();
             this.cancellable = null;
         }
     }
 
     public void abort() {
         if (this.aborted) {
             return;
         }
         this.abortLock.lock();
         try {
             this.aborted = true;
             cancelExecution();
         } finally {
             this.abortLock.unlock();
         }
     }
 
     public boolean isAborted() {
         return this.aborted;
     }
 
     /**
      * @since 4.2
      */
     public void setCancellable(final Cancellable cancellable) {
         if (this.aborted) {
             return;
         }
         this.abortLock.lock();
         try {
             this.cancellable = cancellable;
         } finally {
             this.abortLock.unlock();
         }
     }
 
     @Override
     public Object clone() throws CloneNotSupportedException {
         final AbstractExecutionAwareRequest clone = (AbstractExecutionAwareRequest) super.clone();
         clone.headergroup = CloneUtils.cloneObject(this.headergroup);
         clone.params = CloneUtils.cloneObject(this.params);
         clone.abortLock = new ReentrantLock();
         clone.cancellable = null;
         clone.aborted = false;
         return clone;
     }
 
     /**
      * @since 4.2
      */
     public void completed() {
         this.abortLock.lock();
         try {
             this.cancellable = null;
         } finally {
             this.abortLock.unlock();
         }
     }
 
     /**
      * Resets internal state of the request making it reusable.
      *
      * @since 4.2
      */
     public void reset() {
         this.abortLock.lock();
         try {
             cancelExecution();
             this.aborted = false;
         } finally {
             this.abortLock.unlock();
         }
     }
 
 }