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

import org.apache.geode.annotations.Immutable;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.Region.Entry;
import org.apache.geode.internal.cache.EntrySnapshot;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.NonLocalRegionEntry;
import org.apache.geode.internal.cache.tier.Command;
import org.apache.geode.internal.cache.tier.sockets.ServerConnection;

/**
 * getEntry(key) operation performed on server. Extends Request, and overrides getValueAndIsObject()
 * in Request so as to not invoke loader.
 *
 * @since GemFire 6.6
 */
public class GetEntryCommand extends Request {

  @Immutable
  private static final GetEntryCommand singleton = new GetEntryCommand();

  public static Command getCommand() {
    return singleton;
  }

  protected GetEntryCommand() {}

  @Override
  public void getValueAndIsObject(Region p_region, Object key, Object callbackArg,
      ServerConnection servConn, Object[] result) {
    Object data = null;
    LocalRegion region = (LocalRegion) p_region;
    Entry entry = region.getEntry(key);
    if (logger.isDebugEnabled()) {
      logger.debug("GetEntryCommand: for key: {} returning entry: {}", key, entry);
    }
    if (entry != null) {
      EntrySnapshot snap = new EntrySnapshot();
      NonLocalRegionEntry re = new NonLocalRegionEntry(entry, region);
      snap.setRegionEntry(re);
      snap.setRegion(region);
      data = snap;
    }
    result[0] = data;
    result[1] = true; // isObject is true
  }
}