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/**
* 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.
*/
#ifndef ORC_OUTPUTSTREAM_HH
#define ORC_OUTPUTSTREAM_HH
#include "Adaptor.hh"
#include "BlockBuffer.hh"
#include "orc/OrcFile.hh"
#include "wrap/zero-copy-stream-wrapper.h"
namespace orc {
/**
* Record write position for creating index stream
*/
class PositionRecorder {
public:
virtual ~PositionRecorder();
virtual void add(uint64_t pos) = 0;
};
DIAGNOSTIC_PUSH
#ifdef __clang__
DIAGNOSTIC_IGNORE("-Wunused-private-field")
#endif
struct WriterMetrics;
/**
* A subclass of Google's ZeroCopyOutputStream that supports output to memory
* buffer, and flushing to OutputStream.
* By extending Google's class, we get the ability to pass it directly
* to the protobuf writers.
*/
class BufferedOutputStream : public google::protobuf::io::ZeroCopyOutputStream {
private:
OutputStream* outputStream_;
std::unique_ptr<BlockBuffer> dataBuffer_;
uint64_t blockSize_;
WriterMetrics* metrics_;
public:
BufferedOutputStream(MemoryPool& pool, OutputStream* outStream, uint64_t capacity,
uint64_t blockSize, WriterMetrics* metrics);
virtual ~BufferedOutputStream() override;
virtual bool Next(void** data, int* size) override;
virtual void BackUp(int count) override;
virtual int64_t ByteCount() const override;
virtual bool WriteAliasedRaw(const void* data, int size) override;
virtual bool AllowsAliasing() const override;
virtual std::string getName() const;
virtual uint64_t getSize() const;
virtual uint64_t flush();
virtual void suppress();
virtual uint64_t getRawInputBufferSize() const;
virtual bool isCompressed() const {
return false;
}
virtual void finishStream();
};
DIAGNOSTIC_POP
/**
* An append only buffered stream that allows
* buffer, and flushing to OutputStream.
* By extending Google's class, we get the ability to pass it directly
* to the protobuf writers.
*/
class AppendOnlyBufferedStream {
private:
std::unique_ptr<BufferedOutputStream> outStream_;
char* buffer_;
int bufferOffset_, bufferLength_;
public:
AppendOnlyBufferedStream(std::unique_ptr<BufferedOutputStream> outStream)
: outStream_(std::move(outStream)) {
buffer_ = nullptr;
bufferOffset_ = bufferLength_ = 0;
}
void write(const char* data, size_t size);
uint64_t getSize() const;
uint64_t flush();
void finishStream();
void recordPosition(PositionRecorder* recorder) const;
};
} // namespace orc
#endif // ORC_OUTPUTSTREAM_HH
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