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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
 * Copyright (C) 2009-2011 Couchbase, Inc.
 *
 * 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.binary;

import net.spy.memcached.ops.CASOperation;
import net.spy.memcached.ops.StoreOperation;
import net.spy.memcached.ops.StoreType;

class StoreOperationImpl extends SingleKeyOperationImpl implements
    StoreOperation, CASOperation {

  private static final byte SET = 0x01;
  private static final byte ADD = 0x02;
  private static final byte REPLACE = 0x03;

  static final byte SETQ = 0x11;
  static final byte ADDQ = 0x12;
  static final byte REPLACEQ = 0x13;

  // 4-byte flags, 4-byte expiration
  static final int EXTRA_LEN = 8;

  private final StoreType storeType;
  private final int flags;
  private final int exp;
  private final long cas;
  private final byte[] data;

  private static byte cmdMap(StoreType t) {
    byte rv;
    switch (t) {
    case set:
      rv = SET;
      break;
    case add:
      rv = ADD;
      break;
    case replace:
      rv = REPLACE;
      break;
    default:
      rv = DUMMY_OPCODE;
    }
    // Check fall-through.
    assert rv != DUMMY_OPCODE : "Unhandled store type:  " + t;
    return rv;
  }

  public StoreOperationImpl(StoreType t, String k, int f, int e, byte[] d,
      long c, StoreOperation.Callback cb) {
    super(cmdMap(t), generateOpaque(), k, cb);
    flags = f;
    exp = e;
    data = d;
    cas = c;
    storeType = t;
  }

  @Override
  public void initialize() {
    prepareBuffer(key, cas, data, flags, exp);
  }

  public long getCasValue() {
    return cas;
  }

  public int getExpiration() {
    return exp;
  }

  public int getFlags() {
    return flags;
  }

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

  public StoreType getStoreType() {
    return storeType;
  }

  @Override
  protected void decodePayload(byte[] pl) {
    super.decodePayload(pl);
    ((StoreOperation.Callback) getCallback()).gotData(key, responseCas);
  }

  @Override
  public String toString() {
    return super.toString() + " Cas: " + cas + " Exp: " + exp + " Flags: "
      + flags + " Data Length: " + data.length;
  }
}