/*
    * ====================================================================
    * 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.support.classic;
  
  import java.util.concurrent.locks.Condition;
  import java.util.concurrent.locks.ReentrantLock;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.http.impl.nio.ExpandableBuffer;
  import org.apache.hc.core5.util.Args;
  
  /**
   * @since 5.0
   */
  @Contract(threading = ThreadingBehavior.SAFE)
  abstract class AbstractSharedBuffer extends ExpandableBuffer {
  
      final ReentrantLock lock;
      final Condition condition;
  
      volatile boolean endStream;
      volatile boolean aborted;
  
      public AbstractSharedBuffer(final ReentrantLock lock, final int initialBufferSize) {
          super(initialBufferSize);
          this.lock = Args.notNull(lock, "Lock");
          this.condition = lock.newCondition();
      }
  
      @Override
      public boolean hasData() {
          lock.lock();
          try {
              return super.hasData();
          } finally {
              lock.unlock();
          }
      }
  
      @Override
      public int capacity() {
          lock.lock();
          try {
              return super.capacity();
          } finally {
              lock.unlock();
          }
      }
  
      @Override
      public int length() {
          lock.lock();
          try {
              return super.length();
          } finally {
              lock.unlock();
          }
      }
  
      public void abort() {
          lock.lock();
          try {
              endStream = true;
              aborted = true;
              condition.signalAll();
          } finally {
              lock.unlock();
          }
      }
  
      public void reset() {
          if (aborted) {
              return;
          }
         lock.lock();
         try {
             setInputMode();
             buffer().clear();
             endStream = false;
         } finally {
             lock.unlock();
         }
     }
 
     public boolean isEndStream() {
         lock.lock();
         try {
             return endStream && !super.hasData();
         } finally {
             lock.unlock();
         }
     }
 
 }