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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.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

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

public class MGetExecutor extends StringExecutor {

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

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

    if (commandElems.size() < 2) {
      command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.MGET));
      return;
    }

    Collection keys = new ArrayList();
    for (int i = 1; i < commandElems.size(); i++) {
      byte[] keyArray = commandElems.get(i);
      ByteArrayWrapper key = new ByteArrayWrapper(keyArray);
      /*
       * try { checkDataType(key, RedisDataType.REDIS_STRING, context); } catch
       * (RedisDataTypeMismatchException e) { keys.ad continue; }
       */
      keys.add(key);
    }

    Map results = r.getAll(keys);

    Collection values = new ArrayList();

    /*
     * This is done to preserve order in the output
     */
    for (ByteArrayWrapper key : keys)
      values.add(results.get(key));

    command.setResponse(Coder.getBulkStringArrayResponse(context.getByteBufAllocator(), values));

  }

}