@Override
  public <T> Map<String, T> getBulk(Collection<String> keys,
      Transcoder<T> tc) {
    return getBulk(keys.iterator(), tc);
  }
Get the values for multiple keys from the cache.

@param <T>
@param keys the keys
@param tc the transcoder to serialize and unserialize value
@return a map of the values (for each value that exists)
@throws OperationTimeoutException if the global operation timeout is
          exceeded
@throws IllegalStateException in the rare circumstance where queue is too
          full to accept any more requests
src/main/java/net/spy/memcached/MemcachedClient.java