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75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/*
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Copyright (c) 2019 Sogou, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author: Xie Han (xiehan@sogou-inc.com)
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*/
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#ifndef _PROTOCOLMESSAGE_H_
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#define _PROTOCOLMESSAGE_H_
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#include <errno.h>
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#include <stddef.h>
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#include "Communicator.h"
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/**
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* @file ProtocolMessage.h
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* @brief General Protocol Interface
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*/
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namespace protocol
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{
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class ProtocolMessage : public CommMessageOut, public CommMessageIn
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{
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private:
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virtual int encode(struct iovec vectors[], int max)
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{
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errno = ENOSYS;
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return -1;
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}
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/* You have to implement one of the 'append' functions, and the first one
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* with arguement 'size_t *size' is recommmended. */
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/* Argument 'size' indicates bytes to append, and returns bytes used. */
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virtual int append(const void *buf, size_t *size)
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{
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return this->append(buf, *size);
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}
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/* When implementing this one, all bytes are consumed. Cannot support
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* streaming protocol. */
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virtual int append(const void *buf, size_t size)
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{
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errno = ENOSYS;
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return -1;
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}
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public:
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void set_size_limit(size_t limit) { this->size_limit = limit; }
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size_t get_size_limit() const { return this->size_limit; }
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protected:
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size_t size_limit;
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public:
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ProtocolMessage() { this->size_limit = (size_t)-1; }
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};
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}
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#endif
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