greenplumn reader 源码
greenplumn reader 代码
文件路径：/gpcontrib/gpcloud/include/reader.h
#ifndef __S3_READER_H__
#define __S3_READER_H__
#include "s3common_headers.h"
#include "s3params.h"
class Reader {
public:
virtual ~Reader() {
}
virtual void open(const S3Params ¶ms) = 0;
// read() attempts to read up to count bytes into the buffer.
// Always return 0 if EOF, no matter how many times it's invoked. Throw exception if encounters
// errors.
virtual uint64_t read(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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