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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.hash;

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.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisDataType;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;

public class HDelExecutor extends HashExecutor {

  private final int START_FIELDS_INDEX = 2;

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

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

    int numDeleted = 0;

    ByteArrayWrapper key = command.getKey();

    checkDataType(key, RedisDataType.REDIS_HASH, context);
    Region keyRegion = getRegion(context, key);

    if (keyRegion == null) {
      command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), numDeleted));
      return;
    }


    for (int i = START_FIELDS_INDEX; i < commandElems.size(); i++) {
      ByteArrayWrapper field = new ByteArrayWrapper(commandElems.get(i));
      Object oldValue = keyRegion.remove(field);
      if (oldValue != null)
        numDeleted++;
    }
    if (keyRegion.isEmpty()) {
      context.getRegionProvider().removeKey(key, RedisDataType.REDIS_HASH);
    }
    command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), numDeleted));
  }

}