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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.internal.memcached.commands;

import java.nio.ByteBuffer;

import org.apache.geode.cache.Cache;
import org.apache.geode.internal.memcached.RequestReader;
import org.apache.geode.memcached.GemFireMemcachedServer;
import org.apache.geode.memcached.GemFireMemcachedServer.Protocol;

/**
 * Sends current version of gemcached server to the client
 * 
 *
 */
public class VersionCommand extends AbstractCommand {

  @Override
  public ByteBuffer processCommand(RequestReader request, Protocol protocol, Cache cache) {
    String version = GemFireMemcachedServer.version;
    if (protocol == Protocol.ASCII) {
      return asciiCharset.encode("VERSION " + version + "\r\n");
    }
    ByteBuffer response = request.getResponse(HEADER_LENGTH + version.length());
    response.putInt(TOTAL_BODY_LENGTH_INDEX, version.length());
    response.position(HEADER_LENGTH);
    response.put(asciiCharset.encode(version));
    response.rewind();
    request.getRequest().position(HEADER_LENGTH);
    return response;
  }

}