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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing

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/*
 * 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.redis.internal.executor.string;

import java.util.List;

import org.apache.geode.cache.Region;
import org.apache.geode.redis.internal.ByteArrayWrapper;
import org.apache.geode.redis.internal.Command;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;

public class GetSetExecutor extends StringExecutor {

  private final int VALUE_INDEX = 2;

  @Override
  public void executeCommand(Command command, ExecutionHandlerContext context) {
    List commandElems = command.getProcessedCommand();

    Region r = context.getRegionProvider().getStringsRegion();

    if (commandElems.size() < 3) {
      command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.GETSET));
      return;
    }

    ByteArrayWrapper key = command.getKey();
    checkAndSetDataType(key, context);

    byte[] newCharValue = commandElems.get(VALUE_INDEX);
    ByteArrayWrapper newValueWrapper = new ByteArrayWrapper(newCharValue);

    ByteArrayWrapper oldValueWrapper = r.get(key);
    r.put(key, newValueWrapper);

    if (oldValueWrapper == null) {
      command.setResponse(Coder.getNilResponse(context.getByteBufAllocator()));
    } else {
      command.setResponse(
          Coder.getBulkStringResponse(context.getByteBufAllocator(), oldValueWrapper.toBytes()));
    }

  }
}