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 io.jafka.network;
  
  import java.io.IOException;
  import java.nio.channels.GatheringByteChannel;
  import java.util.Iterator;
  import java.util.List;
  
  /**
   * A set of composite sends, sent one after another
   * 
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  public abstract class MultiSend<S extends Send> extends AbstractSend {
  
      protected int expectedBytesToWrite;
  
      private int totalWritten = 0;
  
      private List<S> sends;
  
      private Iterator<S> iter;
  
      private S current;
  
      public MultiSend() {
  
      }
  
      public MultiSend(List<S> sends) {
          setSends(sends);
      }
  
  
      protected void setSends(List<S> sends) {
          this.sends = sends;
          this.iter = sends.iterator();
          if (iter.hasNext()) {
              this.current = iter.next();
          }
      }
  
      public List<S> getSends() {
          return sends;
      }
  
      public boolean complete() {
          if (current != null) return false;
          if (totalWritten != expectedBytesToWrite) {
              logger.error("mismatch in sending bytes over socket; expected: " + expectedBytesToWrite + " actual: " + totalWritten);
          }
          return true;
      }
  
      public int writeTo(GatheringByteChannel channel) throws IOException {
          expectIncomplete();
          int written = current.writeTo(channel);
          totalWritten += written;
          if (current.complete()) {//move to next element while current element is finished writting
              current = iter.hasNext() ? iter.next() : null;
          }
          return written;
      }
  }
  