code: /**
  Copyright (c) 2007-2013 Alysson Bessani, Eduardo Alchieri, Paulo Sousa, and the authors indicated in the @author tags
  
  Licensed 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 bftsmart.consensus.roles;
  
  import bftsmart.communication.ServerCommunicationSystem;
  import bftsmart.consensus.messages.MessageFactory;
  import bftsmart.reconfiguration.ServerViewController;
  
  /**
   * This class represents the proposer role in the das protocol.
   **/
  public class Proposer {
  
      private MessageFactory factory; // Factory for PaW messages
      private ServerCommunicationSystem communication; // Replicas comunication system
      private ServerViewController controller;
  
      /**
       * Creates a new instance of Proposer
       * 
       * @param communication Replicas communication system
       * @param factory Factory for PaW messages
       * @param verifier Proof verifier
       * @param conf TOM configuration
       */
      public Proposer(ServerCommunicationSystem communication, MessageFactory factory,
              ServerViewController controller) {
          this.communication = communication;
          this.factory = factory;
          this.controller = controller;
      }
  
      /**
       * This method is called by the TOMLayer (or any other)
       * to start the das instance.
       *
       * @param cid ID for the das instance to be started
       * @param value Value to be proposed
       */
      public void startConsensus(int cid, byte[] value) {
          //******* EDUARDO BEGIN **************//
          communication.send(this.controller.getCurrentViewAcceptors(),
                  factory.createPropose(cid, 0, value));
          //******* EDUARDO END **************//
      }
  }
  