epochinetsocketaddress.java

pastry的java实现的2.0b版

/*************************************************************************

"FreePastry" Peer-to-Peer Application Development Substrate 

Copyright 2002, Rice University. All rights reserved.

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This software is provided by RICE and the contributors on an "as is"
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********************************************************************************/

package rice.pastry.socket;

import java.io.*;
import java.net.*;

import rice.p2p.commonapi.*;
import rice.p2p.commonapi.rawserialization.*;

/**
 * Class which represets a source route to a remote IP address.
 *
 * @version $Id: EpochInetSocketAddress.java 3274 2006-05-15 16:17:47Z jeffh $
 * @author Alan Mislove
 */
public class EpochInetSocketAddress implements Serializable {

  // the address
  /**
   * DESCRIBE THE FIELD
   */
  protected InetSocketAddress address;

  // the epoch number of the remote node
  /**
   * DESCRIBE THE FIELD
   */
  protected long epoch;

  /**
   */
  private final static long serialVersionUID = 2081191512212313338L;

  // a static epoch which indicates an unknown (and unmattering) epoch number
  /**
   * DESCRIBE THE FIELD
   */
  public final static long EPOCH_UNKNOWN = -1;

  /**
   * Constructor - don't use this unless you know what you are doing
   *
   * @param address The remote address
   */
  public EpochInetSocketAddress(InetSocketAddress address) {
    this(address, EPOCH_UNKNOWN);
  }

  /**
   * Constructor
   *
   * @param address The remote address
   * @param epoch The remote epoch
   */
  public EpochInetSocketAddress(InetSocketAddress address, long epoch) {
    this.address = address;
    this.epoch = epoch;
  }

  /**
   * Method which returns the address of this address
   *
   * @return The address
   */
  public InetSocketAddress getAddress() {
    return address;
  }

  /**
   * Method which returns the epoch of this address
   *
   * @return The epoch
   */
  public long getEpoch() {
    return epoch;
  }

  /**
   * Returns the hashCode of this source route
   *
   * @return The hashCode
   */
  public int hashCode() {
    return (int) (address.hashCode() ^ epoch);
  }

  /**
   * Checks equaltiy on source routes
   *
   * @param o The source route to compare to
   * @return The equality
   */
  public boolean equals(Object o) {
    if (o == null) {
      return false;
    }
    EpochInetSocketAddress that = (EpochInetSocketAddress) o;
    if (this.epoch != that.epoch) {
      return false;
    }
    return (this.address.equals(that.address));
  }

  /**
   * Internal method for computing the toString of an array of
   * InetSocketAddresses
   *
   * @return THe string
   */
  public String toString() {
    return address.toString() + " [" + epoch + "]";
  }

  /**
   * EpochInetSocketAddress: (IPV4): +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + InetAddress + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + port (int) + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + epoch (long) + + + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   *
   * @param buf
   * @exception IOException DESCRIBE THE EXCEPTION
   */
  public void serialize(OutputBuffer buf) throws IOException {
    buf.write(address.getAddress().getAddress(), 0, 4);
    buf.writeInt(address.getPort());
    buf.writeLong(epoch);
  }

  /**
   * EpochInetSocketAddress: (IPV4): +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + InetAddress + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + port (int) + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * + epoch (long) + + + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   *
   * @param buf
   * @return
   * @throws IOException
   */
  public static EpochInetSocketAddress build(InputBuffer buf) throws IOException {
    byte[] addrBytes = new byte[4];
    buf.read(addrBytes);
    InetAddress addr = InetAddress.getByAddress(addrBytes);
    int port = buf.readInt();
//    try {
    InetSocketAddress saddr = new InetSocketAddress(addr, port);
    long epoch = buf.readLong();
    return new EpochInetSocketAddress(saddr, epoch);
//    } catch (IllegalArgumentException iae) {
//      throw iae; // just to set a breakpoint
//    }
  }
}