greenplumn writer 源码

greenplumn writer 代码

文件路径：/gpcontrib/gpcloud/include/writer.h

#ifndef __S3_WRITER_H__
#define __S3_WRITER_H__

#include "s3common_headers.h"
#include "s3params.h"

class Writer {
   public:
    virtual ~Writer() {
    }

    virtual void open(const S3Params &params) = 0;

    / write() attempts to write up to count bytes from the buffer.
    / Always return 0 if EOF, no matter how many times it's invoked. Throw exception if encounters
    / errors.
    virtual uint64_t write(const char *buf, uint64_t count) = 0;

    / This should be reentrant, has no side effects when called multiple times.
    virtual void close() = 0;
};

#endif

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