public StoreOperation store(StoreType storeType, String key, int flags,
      int exp, byte[] data, StoreOperation.Callback cb) {
    return new StoreOperationImpl(storeType, key, flags, exp, data, cb);
  }
Operation factory for the ascii protocol.
src/main/java/net/spy/memcached/protocol/ascii/AsciiOperationFactory.java