io.scalecube.cluster.fdetector.PingData Maven / Gradle / Ivy

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package io.scalecube.cluster.fdetector;

import io.scalecube.cluster.Member;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.StringJoiner;

/** DTO class. Supports FailureDetector messages (Ping, Ack, PingReq). */
final class PingData implements Externalizable {

  private static final long serialVersionUID = 1L;

  enum AckType {

    /**
     * Ping completed successfully.
     *
     * Destination member responded normally.
     */
    DEST_OK,

    /**
     * Ping didn't complete normally.
     *
     * Member referenced by field {@link #to} is gone.
     */
    DEST_GONE
  }

  /** Message's source address. */
  private Member from;
  /** Message's destination address. */
  private Member to;
  /** Address of member, who originally initiated ping sequence. */
  private Member originalIssuer;
  /** Ping response type. */
  private AckType ackType;

  public PingData() {}

  private PingData(PingData other) {
    this.from = other.from;
    this.to = other.to;
    this.originalIssuer = other.originalIssuer;
    this.ackType = other.ackType;
  }

  public PingData(Member from, Member to) {
    this.from = from;
    this.to = to;
    this.originalIssuer = null;
    this.ackType = null;
  }

  public PingData(Member from, Member to, Member originalIssuer) {
    this.from = from;
    this.to = to;
    this.originalIssuer = originalIssuer;
    this.ackType = null;
  }

  public Member getFrom() {
    return from;
  }

  public Member getTo() {
    return to;
  }

  public Member getOriginalIssuer() {
    return originalIssuer;
  }

  public AckType getAckType() {
    return ackType;
  }

  public PingData withAckType(AckType ackType) {
    PingData p = new PingData(this);
    p.ackType = ackType;
    return p;
  }

  @Override
  public void writeExternal(ObjectOutput out) throws IOException {
    // from
    out.writeObject(from);
    // to
    out.writeObject(to);
    // originalIssuer
    out.writeObject(originalIssuer);
    // ackType
    out.writeObject(ackType);
  }

  @Override
  public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
    // from
    from = (Member) in.readObject();
    // to
    to = (Member) in.readObject();
    // originalIssuer
    originalIssuer = (Member) in.readObject();
    // ackType
    ackType = (AckType) in.readObject();
  }

  @Override
  public String toString() {
    return new StringJoiner(", ", PingData.class.getSimpleName() + "[", "]")
        .add("from=" + from)
        .add("to=" + to)
        .add("originalIssuer=" + originalIssuer)
        .add("ackType=" + ackType)
        .toString();
  }
}