/*
    * ====================================================================
    * 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.atomic.AtomicMarkableReference;
  
  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 final AtomicMarkableReference<Cancellable> cancellableRef;
  
      protected AbstractExecutionAwareRequest() {
          super();
          this.cancellableRef = new AtomicMarkableReference<Cancellable>(null, false);
      }
  
      /**
       * @deprecated Use {@link #setCancellable(Cancellable)}
       */
      @Override
      @Deprecated
      public void setConnectionRequest(final ClientConnectionRequest connRequest) {
          setCancellable(new Cancellable() {
  
              @Override
              public boolean cancel() {
                  connRequest.abortRequest();
                  return true;
              }
  
          });
      }
  
      /**
       * @deprecated Use {@link #setCancellable(Cancellable)}
       */
      @Override
      @Deprecated
      public void setReleaseTrigger(final ConnectionReleaseTrigger releaseTrigger) {
          setCancellable(new Cancellable() {
  
              @Override
              public boolean cancel() {
                  try {
                      releaseTrigger.abortConnection();
                      return true;
                  } catch (final IOException ex) {
                      return false;
                  }
              }
  
          });
      }
  
      @Override
      public void abort() {
          while (!cancellableRef.isMarked()) {
              final Cancellable actualCancellable = cancellableRef.getReference();
              if (cancellableRef.compareAndSet(actualCancellable, actualCancellable, false, true)) {
                  if (actualCancellable != null) {
                      actualCancellable.cancel();
                  }
              }
          }
      }
  
     @Override
     public boolean isAborted() {
         return this.cancellableRef.isMarked();
     }
 
     /**
      * @since 4.2
      */
     @Override
     public void setCancellable(final Cancellable cancellable) {
         final Cancellable actualCancellable = cancellableRef.getReference();
         if (!cancellableRef.compareAndSet(actualCancellable, cancellable, false, false)) {
             cancellable.cancel();
         }
     }
 
     @Override
     public Object clone() throws CloneNotSupportedException {
         final AbstractExecutionAwareRequestche/http/client/methods/AbstractExecutionAwareRequest.html#AbstractExecutionAwareRequest">AbstractExecutionAwareRequest clone = (AbstractExecutionAwareRequest) super.clone();
         clone.headergroup = CloneUtils.cloneObject(this.headergroup);
         clone.params = CloneUtils.cloneObject(this.params);
         return clone;
     }
 
     /**
      * @since 4.2
      *
      * @deprecated Do not use.
      */
     @Deprecated
     public void completed() {
         this.cancellableRef.set(null, false);
     }
 
     /**
      * Resets internal state of the request making it reusable.
      *
      * @since 4.2
      */
     public void reset() {
         for (;;) {
             final boolean marked = cancellableRef.isMarked();
             final Cancellable actualCancellable = cancellableRef.getReference();
             if (actualCancellable != null) {
                 actualCancellable.cancel();
             }
             if (cancellableRef.compareAndSet(actualCancellable, null, marked, false)) {
                 break;
             }
         }
     }
 
 }