geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/UnregisterAllInterest.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.internal.cache.tier.sockets;

import java.io.ObjectStreamException;
import java.io.Serializable;

import org.apache.geode.annotations.Immutable;

/**
 * Singleton token indicating that all interest registrations should be removed.
 *
 *
 */
public class UnregisterAllInterest implements Serializable {
  private static final long serialVersionUID = 5026160621257178459L;
  @Immutable
  private static final UnregisterAllInterest SINGLETON = new UnregisterAllInterest();

  /**
   * Return the only instance of this class.
   */
  public static UnregisterAllInterest singleton() {
    return SINGLETON;
  }

  /** Creates a new instance of UnregisterAllInterest */
  private UnregisterAllInterest() {}

  @Override
  public String toString() {
    return "UNREGISTER ALL INTEREST";
  }

  private Object readResolve() throws ObjectStreamException {
    return SINGLETON;
  }
}