public class MemcachedConstant {  public static final int MEMCACHED_GOODSDETAIL = 0;  public static final int MEMCACHED_ARTICLEDETAIL = 1;  public static final int MEMCACHED_COMMENTDETAIL = 2;  public static final int MEMCACHED_OTHERDETAIL = 3;
}

public class MemcachedKeyUtil {  private static final String GOODS_KEY_PREFIX = "goods_";  public static String getGoodsKey(long goodsId) {  return GOODS_KEY_PREFIX + goodsId;  }
}

public class MemcachedUtil {  private int MEMCACHED_SERVER_NUM = 4;  private SockIOPool[] pools = new SockIOPool[MEMCACHED_SERVER_NUM];  private MemCachedClient[] mcs = new MemCachedClient[MEMCACHED_SERVER_NUM];  private final String[] poolNames = new String[] { "GOODSDETAIL_POOL", "", "", "" };  private static MemcachedUtil instance;  private MemcachedUtil() {  this.init();  }  // 单例  public static MemcachedUtil getInstance() {  if (MemcachedUtil.instance == null) {  synchronized (MemcachedUtil.class) {  if (MemcachedUtil.instance == null) {  MemcachedUtil.instance = new MemcachedUtil();  }  }  }  return MemcachedUtil.instance;  }  public Object get(int index, String key) {  return this.mcs[index].get(key);  }  public boolean set(int index, String key, Object value) {  return this.mcs[index].set(key, value);  }  public boolean delete(String key) {  return this.mcs[index].delete(key);  }  public MemCachedClient getMemCachedClient(int index) {  return this.mcs[index];  }  public void init() {  for (int i = 0; i < MEMCACHED_SERVER_NUM; ++i) {  this.pools[i] = SockIOPool.getInstance(poolNames[i]);  this.pools[i].setServers(servers);  this.pools[i].setWeights(weights);  this.pools[i].setInitConn(initConn);  this.pools[i].setMinConn(minConn);  this.pools[i].setMaxConn(maxConn);  this.pools[i].setMaxIdle(maxIdle);  this.pools[i].setMaxBusyTime(maxBusyTime);  this.pools[i].setMaintSleep(maintSleep);  this.pools[i].setNagle(ifNagle);  this.pools[i].setSocketTO(socketTO);  this.pools[i].setSocketConnectTO(socketConnectTO);  this.pools[i].setFailover(ifFailOver);  this.pools[i].setFailback(ifFailback);  this.pools[i].setAliveCheck(ifAliveCheck);  this.pools[i].initialize();  this.mcs[i] = new MemCachedClient(poolNames[i]);  }  }
}

public class MemcachedSupport {  public boolean setDetailData(String key, Object value) {  return MemcachedUtil.getInstance().set(MemcachedConstant.MEMCACHED_DETAIL, key, value);  }  public Object getDetailData(String key) {  return MemcachedUtil.getInstance().get(MemcachedConstant.MEMCACHED_DETAIL, key);  }  public boolean deleteDetailData(String key) {  return MemcachedUtil.getInstance().delete(MemcachedConstant.MEMCACHED_DETAIL);  }
}

public class GoodsCacheImpl extends MemcachedSupport{  @Resource(name = "goodsDaoImpl")  private GoodsDao goodsDao;  public Goods selectGoodsById(long goodsId) {  Goods goods = null;  String goodsKey = MemcachedKeyUtil.getGoodsKey(goodsId);  goods = (Goods) getDetailData(goodsKey);  if (goods == null) {  goods = goodsDao.selectGoodsById(goodsId, false);  if (goods != null) {  setDetailData(goodsKey, goods);  }  }  return goods;  }
}