NetworkClientObjectReceiverImpl.java

package org.prevayler.foundation.network;
import java.io.IOException;

public class NetworkClientObjectReceiverImpl implements ObjectReceiver {
  /** 
 * our connection to the network 
 */
  private ObjectSocket _provider;
  /** 
 * the upper layer who we give what we receive to 
 */
  private ObjectReceiver _client;
  private volatile boolean _closing;
  public NetworkClientObjectReceiverImpl(  String ipAddress,  int port,  ObjectReceiver client) throws IOException {
    this(new ObjectSocketImpl(ipAddress,port),client);
  }
  public NetworkClientObjectReceiverImpl(  ObjectSocket objectSocket,  Service service) throws IOException {
    _provider=objectSocket;
    _client=service.serverFor(this);
    startReading();
  }
  public NetworkClientObjectReceiverImpl(  ObjectSocket objectSocket,  ObjectReceiver client){
    _provider=objectSocket;
    _client=client;
    startReading();
  }
  /** 
 * Create a reader thread
 */
  private void startReading(){
    Thread reader=new Thread(){
      public void run(){
        while (!_closing)         receiveFromNetwork();
      }
    }
;
    reader.setName("Prevayler Network Client Receiver");
    reader.setDaemon(true);
    reader.start();
  }
  /** 
 * When something is read give it to our client, also give it the exception
 */
  private void receiveFromNetwork(){
    try {
      Object object=_provider.readObject();
      passToClient(object);
    }
 catch (    Exception ex) {
      closeDown();
      if (_closing) {
        return;
      }
      passToClient(ex);
    }
  }
  private void closeDown(){
    try {
      close();
    }
 catch (    IOException ignorable) {
    }
    try {
      _client.close();
    }
 catch (    IOException neverThrown) {
    }
  }
  private void passToClient(  Object object){
    try {
      _client.receive(object);
    }
 catch (    IOException unExpected) {
      unExpected.printStackTrace();
    }
  }
  /** 
 * Receive an object from prevayler client to be sent to the network
 */
  public void receive(  Object object) throws IOException {
    _provider.writeObject(object);
  }
  public void close() throws IOException {
    _closing=true;
    _provider.close();
  }
}