/*
 * 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.
 */

package org.netbeans.installer.downloader;

/**
 *
 * @author Danila_Dugurov
 */

/**
 * be aware of: If listener contract will be changed - analize carefully all fired events
 * Some pices of code based on reflection and invocation, so
 * NoSuchMethodException may occures.(It's implementation pitfalls)
 */
public interface DownloadListener {
  
  /**
   * notification that pumping was update means that some pice of bytes downloaded
   * or some meta data such as real url, output file name obtain from server.
   */
  void pumpingUpdate(String id);
  
  /**
   * This property was separate from pumping update because it's describe pumping as process
   * and in pumping update - notify that pumping was changed as entity.
   */
  void pumpingStateChange(String id);
  
  void pumpingAdd(String id);
  void pumpingDelete(String id);
  
  void queueReset();
  
  /**
   * notification that downloader invoked work.
   */
  void pumpsInvoke();
  
  
  /**
   * notification that downloader stoped work.
   */
  void pumpsTerminate();
}
