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80c663882a
Summary: First draft. Unit tests pass. Test Plan: unit tests attached Reviewers: heyongqiang Reviewed By: heyongqiang Differential Revision: https://reviews.facebook.net/D3969
148 lines
4 KiB
C++
148 lines
4 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#ifndef _THRIFT_TRANSPORT_TMEMPAGEDTRANSPORT_H_
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#define _THRIFT_TRANSPORT_TMEMPAGEDTRANSPORT_H_ 1
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#include "thrift/lib/cpp/transport/TVirtualTransport.h"
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#include "thrift/lib/cpp/transport/TMemPagedFactory.h"
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#include <boost/shared_ptr.hpp>
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namespace apache { namespace thrift { namespace transport {
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using namespace boost;
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/**
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* Class TTransport for direct usage of paged memory
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* NOT thread safe - for a higher performance trade-off
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*/
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class TMemPagedTransport : public TVirtualTransport<TMemPagedTransport> {
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public:
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/**
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* Constructor
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*/
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TMemPagedTransport(shared_ptr<FixedSizeMemoryPageFactory>& factory);
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/**
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* Destructor
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*/
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~TMemPagedTransport();
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/**
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* Whether this transport is open.
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*/
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virtual bool isOpen();
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/**
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* Opens the transport.
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*/
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virtual void open();
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/**
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* Closes the transport.
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*/
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virtual void close();
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/**
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* Called when read is completed.
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* This can be over-ridden to perform a transport-specific action
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* e.g. logging the request to a file
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*
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* @return number of bytes read if available, 0 otherwise.
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*/
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virtual uint32_t readEnd();
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/**
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* Called when write is completed.
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* This can be over-ridden to perform a transport-specific action
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* at the end of a request.
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*
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* @return number of bytes written if available, 0 otherwise
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*/
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virtual uint32_t writeEnd();
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/**
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* Implementations of the base functions
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*/
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inline uint32_t read(uint8_t* buf, uint32_t len);
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inline void write(const uint8_t* buf, uint32_t len);
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inline const uint8_t* borrow(uint8_t* buf, uint32_t* len);
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inline void consume(uint32_t len);
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inline uint32_t readAll(uint8_t* buf, uint32_t len);
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/**
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* interface extension, not part of the TTrasport
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* make sure there are some bytes for write at the same page available
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*/
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inline uint8_t* reserve(uint32_t* len, bool throwOnError = true);
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/**
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* interface extension, not part of the TTrasport
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* similar to consume but for the write
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*/
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inline void skip(uint32_t len);
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/**
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* Reset buffer for read
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* Sets read offset to zero
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*/
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inline void resetForRead();
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/**
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* Reset buffer for write
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* Sets write offset to zero and releases extra memory pages
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*/
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inline void resetForWrite(bool releaseAllPages = false);
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/**
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* Returns number of bytes already read from buffer
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*/
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inline uint32_t getReadBytes() const;
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/**
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* Returns current bytes written in buffer
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*/
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inline uint32_t getWrittenBytes() const;
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private:
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/**
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* helper function
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* write or skip bytes
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*/
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inline void set(const uint8_t* buf, uint32_t len);
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/**
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* helper function
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* read or skip bytes
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*/
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inline uint32_t get(uint8_t* buf, uint32_t len);
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private:
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shared_ptr<FixedSizeMemoryPageFactory> factory_; //!< memory pages factory
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const uint32_t pageSize_; //!< page size
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FixedSizeMemoryPage* headPage_; //!< head of the stack
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FixedSizeMemoryPage* currentReadPage_; //!< current read page
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uint32_t currentReadOffset_; //!< bytes already read
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FixedSizeMemoryPage* currentWritePage_; //!< current write page
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uint32_t currentWriteOffset_; //!< bytes already written
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};
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}}} // apache::thrift::transport
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#endif // #ifndef _THRIFT_TRANSPORT_TMEMPAGEDTRANSPORT_H_
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