// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you under the Apache License, Version 2.0 (the // "License"); you may not use this file except in compliance // with the License. You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, // software distributed under the License is distributed on an // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY // KIND, either express or implied. See the License for the // specific language governing permissions and limitations // under the License. // Author: Ge,Jun (jge666@gmail.com) // Date: Wed Aug 8 05:51:33 PDT 2018 #ifndef BUTIL_READER_WRITER_H #define BUTIL_READER_WRITER_H #include <sys/uio.h> // iovec namespace butil { // Abstraction for reading data. // The simplest implementation is to embed a file descriptor and read from it. class IReader { public: virtual ~IReader() {} // Semantics of parameters and return value are same as readv(2) except that // there's no `fd'. virtual ssize_t ReadV(const iovec* iov, int iovcnt) = 0; }; // Abstraction for writing data. // The simplest implementation is to embed a file descriptor and writev into it. class IWriter { public: virtual ~IWriter() {} // Semantics of parameters and return value are same as writev(2) except that // there's no `fd'. // WriteV is required to submit data gathered by multiple appends in one // run and enable the possibility of atomic writes. virtual ssize_t WriteV(const iovec* iov, int iovcnt) = 0; }; } // namespace butil #endif // BUTIL_READER_WRITER_H