54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
// 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.
|
|
|
|
// 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
|