net.spy.memcached.protocol.ascii.CASOperationImpl Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of elasticache-java-cluster-client Show documentation

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.

There is a newer version: 1.2.2

Show newest version

/**
 * 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.CASResponse;
import net.spy.memcached.KeyUtil;
import net.spy.memcached.ops.CASOperation;
import net.spy.memcached.ops.CASOperationStatus;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationState;
import net.spy.memcached.ops.OperationStatus;
import net.spy.memcached.ops.StatusCode;
import net.spy.memcached.ops.StoreType;

class CASOperationImpl extends OperationImpl implements CASOperation {

  // Overhead storage stuff to make sure the buffer pushes out far enough.
  // This is "cas" + length(flags) + length(length(data)) + length(cas id)
  // + spaces
  private static final int OVERHEAD = 64;

  private static final OperationStatus STORED = new CASOperationStatus(true,
      "STORED", CASResponse.OK, StatusCode.SUCCESS);
  private static final OperationStatus NOT_FOUND = new CASOperationStatus(
      false, "NOT_FOUND", CASResponse.NOT_FOUND, StatusCode.ERR_NOT_FOUND);
  private static final OperationStatus EXISTS = new CASOperationStatus(false,
      "EXISTS", CASResponse.EXISTS, StatusCode.ERR_EXISTS);

  private final String key;
  private final long casValue;
  private final int flags;
  private final int exp;
  private final byte[] data;

  public CASOperationImpl(String k, long c, int f, int e, byte[] d,
      OperationCallback cb) {
    super(cb);
    key = k;
    casValue = c;
    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, NOT_FOUND, EXISTS));
    transitionState(OperationState.COMPLETE);
  }

  @Override
  public void initialize() {
    ByteBuffer bb = ByteBuffer.allocate(data.length
        + KeyUtil.getKeyBytes(key).length + OVERHEAD);
    setArguments(bb, "cas", key, flags, exp, data.length, casValue);
    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);
  }

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

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

  public long getCasValue() {
    return casValue;
  }

  public int getExpiration() {
    return exp;
  }

  public int getFlags() {
    return flags;
  }

  public StoreType getStoreType() {
    return StoreType.set;
  }

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