extensions/geode-modules/src/main/java/org/apache/geode/modules/util/DebugCacheListener.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.modules.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.geode.cache.Declarable;
import org.apache.geode.cache.EntryEvent;
import org.apache.geode.cache.util.CacheListenerAdapter;

public class DebugCacheListener extends CacheListenerAdapter implements Declarable {
  private static final Logger logger = LoggerFactory.getLogger(DebugCacheListener.class);

  @Override
  public void afterCreate(EntryEvent event) {
    log(event);
  }

  @Override
  public void afterUpdate(EntryEvent event) {
    log(event);
  }

  @Override
  public void afterInvalidate(EntryEvent event) {
    log(event);
  }

  @Override
  public void afterDestroy(EntryEvent event) {
    log(event);
  }

  private void log(EntryEvent event) {
    StringBuilder builder = new StringBuilder();
    builder.append("DebugCacheListener: Received ").append(event.getOperation()).append(" for key=")
        .append(event.getKey());

    if (event.getNewValue() != null) {
      builder.append("; value=").append(event.getNewValue());
    }

    logger.info(builder.toString());
  }

  public boolean equals(Object obj) {
    // This method is only implemented so that RegionCreator.validateRegion works properly.
    // The CacheListener comparison fails because two of these instances are not equal.
    if (this == obj) {
      return true;
    }

    return obj instanceof DebugCacheListener;
  }


  @Override
  public int hashCode() {
    return DebugCacheListener.class.hashCode();
  }
}