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Amazon ElastiCache Cluster Client is an enhanced Java library to connect to ElastiCache clusters. This client library has been built upon Spymemcached and is released under the Amazon Software License.

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/**
 * Copyright (C) 2006-2009 Dustin Sallings
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING
 * IN THE SOFTWARE.
 */

package net.spy.memcached.protocol.ascii;

import java.nio.ByteBuffer;
import java.util.Collection;
import java.util.Collections;

import net.spy.memcached.KeyUtil;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.StatusCode;

/**
 * Base class for ascii store operations (add, set, replace, append, prepend).
 */
abstract class BaseStoreOperationImpl extends OperationImpl {

  private static final int OVERHEAD = 32;
  private static final OperationStatus STORED = new OperationStatus(true,
      "STORED", StatusCode.SUCCESS);
  protected final String type;
  protected final String key;
  protected final int flags;
  protected final int exp;
  protected final byte[] data;

  public BaseStoreOperationImpl(String t, String k, int f, int e, byte[] d,
      OperationCallback cb) {
    super(cb);
    type = t;
    key = k;
    flags = f;
    exp = e;
    data = d;
  }

  @Override
  public void handleLine(String line) {
    assert getState() == OperationState.READING : "Read ``" + line
        + "'' when in " + getState() + " state";
    getCallback().receivedStatus(matchStatus(line, STORED));
    transitionState(OperationState.COMPLETE);
  }

  @Override
  public void initialize() {
    ByteBuffer bb = ByteBuffer.allocate(data.length
        + KeyUtil.getKeyBytes(key).length + OVERHEAD);
    setArguments(bb, type, key, flags, exp, data.length);
    assert bb.remaining() >= data.length + 2 : "Not enough room in buffer,"
        + " need another " + (2 + data.length - bb.remaining());
    bb.put(data);
    bb.put(CRLF);
    bb.flip();
    setBuffer(bb);
  }

  @Override
  protected void wasCancelled() {
    // XXX: Replace this comment with why I did this
    getCallback().receivedStatus(CANCELLED);
  }

  public Collection getKeys() {
    return Collections.singleton(key);
  }

  public int getFlags() {
    return flags;
  }

  public int getExpiration() {
    return exp;
  }

  public byte[] getData() {
    return data;
  }

  @Override
  public String toString() {
    return "Cmd: " + type + " Key: " + key + " Flags: " + flags + " Exp: "
      + exp + " Data Length: " + data.length;
  }
}