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.kafka.common.network;
  
  import java.io.EOFException;
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  /**
   * A send backed by an array of byte buffers
   */
  public class ByteBufferSend implements Send {
  
      private final long size;
      protected final ByteBuffer[] buffers;
      private long remaining;
      private boolean pending = false;
  
      public ByteBufferSend(ByteBuffer... buffers) {
          this.buffers = buffers;
          for (ByteBuffer buffer : buffers)
              remaining += buffer.remaining();
          this.size = remaining;
      }
  
      public ByteBufferSend(ByteBuffer[] buffers, long size) {
          this.buffers = buffers;
          this.size = size;
          this.remaining = size;
      }
  
      @Override
      public boolean completed() {
          return remaining <= 0 && !pending;
      }
  
      @Override
      public long size() {
          return this.size;
      }
  
      @Override
      public long writeTo(TransferableChannel channel) throws IOException {
          long written = channel.write(buffers);
          if (written < 0)
              throw new EOFException("Wrote negative bytes to channel. This shouldn't happen.");
          remaining -= written;
          pending = channel.hasPendingWrites();
          return written;
      }
  
      public long remaining() {
          return remaining;
      }
  
      @Override
      public String toString() {
          return "ByteBufferSend(" +
              ", size=" + size +
              ", remaining=" + remaining +
              ", pending=" + pending +
              ')';
      }
  
      public static ByteBufferSend sizePrefixed(ByteBuffer buffer) {
          ByteBuffer sizeBuffer = ByteBuffer.allocate(4);
          sizeBuffer.putInt(0, buffer.remaining());
          return new ByteBufferSend(sizeBuffer, buffer);
      }
  }
  