content: /*
   * 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.apache.spark.network.client;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /**
   * Callback for streaming data. Stream data will be offered to the
   * {@link #onData(String, ByteBuffer)} method as it arrives. Once all the stream data is received,
   * {@link #onComplete(String)} will be called.
   * <p>
   * The network library guarantees that a single thread will call these methods at a time, but
   * different call may be made by different threads.
   */
  public interface StreamCallback {
    /** Called upon receipt of stream data. */
    void onData(String streamId, ByteBuffer buf) throws IOException;
  
    /** Called when all data from the stream has been received. */
    void onComplete(String streamId) throws IOException;
  
    /** Called if there's an error reading data from the stream. */
    void onFailure(String streamId, Throwable cause) throws IOException;
  }
  