geode-core/src/main/java/org/apache/geode/distributed/internal/membership/gms/messages/InstallViewMessage.java

/*
 * 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 org.apache.geode.distributed.internal.membership.gms.messages;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Objects;

import org.apache.geode.distributed.internal.membership.gms.GMSMembershipView;
import org.apache.geode.internal.serialization.DeserializationContext;
import org.apache.geode.internal.serialization.SerializationContext;
import org.apache.geode.internal.serialization.Version;

public class InstallViewMessage extends AbstractGMSMessage {

  enum messageType {
    INSTALL, PREPARE, SYNC
  }

  private GMSMembershipView view;
  private Object credentials;
  private messageType kind;
  private int previousViewId;

  public InstallViewMessage(GMSMembershipView view, Object credentials, boolean preparing) {
    this.view = view;
    this.kind = preparing ? messageType.PREPARE : messageType.INSTALL;
    this.credentials = credentials;
  }

  public InstallViewMessage(GMSMembershipView view, Object credentials, int previousViewId,
      boolean preparing) {
    this.view = view;
    this.kind = preparing ? messageType.PREPARE : messageType.INSTALL;
    this.credentials = credentials;
    this.previousViewId = previousViewId;
  }

  public InstallViewMessage() {
    // no-arg constructor for serialization
  }

  public boolean isRebroadcast() {
    return kind == messageType.SYNC;
  }

  public GMSMembershipView getView() {
    return view;
  }

  public Object getCredentials() {
    return credentials;
  }

  public boolean isPreparing() {
    return kind == messageType.PREPARE;
  }

  @Override
  public Version[] getSerializationVersions() {
    return null;
  }

  @Override
  public int getDSFID() {
    return INSTALL_VIEW_MESSAGE;
  }

  @Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    out.writeInt(previousViewId);
    out.writeInt(kind.ordinal());
    context.getSerializer().writeObject(this.view, out);
    context.getSerializer().writeObject(this.credentials, out);
  }

  @Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    this.previousViewId = in.readInt();
    this.kind = messageType.values()[in.readInt()];
    this.view = (GMSMembershipView) context.getDeserializer().readObject(in);
    this.credentials = context.getDeserializer().readObject(in);
  }

  @Override
  public String toString() {
    return "InstallViewMessage(type=" + this.kind + "; Current ViewID=" + view.getViewId()
        + "; Previous View ID=" + previousViewId + "; " + this.view + "; cred="
        + (credentials == null ? "null" : "not null") + ")";
  }

  @Override
  public int hashCode() {
    return Objects.hash(view, previousViewId);
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    InstallViewMessage other = (InstallViewMessage) obj;
    if (credentials == null) {
      if (other.credentials != null)
        return false;
    } else if (!credentials.equals(other.credentials))
      return false;
    if (kind != other.kind)
      return false;
    if (previousViewId != other.previousViewId)
      return false;
    if (view == null) {
      if (other.view != null)
        return false;
    } else if (!view.equals(other.view))
      return false;
    return true;
  }
}