greenplumn gpwriter 源码
greenplumn gpwriter 代码
文件路径：/gpcontrib/gpcloud/include/gpwriter.h
#ifndef INCLUDE_GPWRITER_H_
#define INCLUDE_GPWRITER_H_
#include "s3common_headers.h"
#include "s3common_writer.h"
#include "s3interface.h"
#include "s3log.h"
#include "s3macros.h"
#include "s3utils.h"
#include "writer.h"
#define S3_DEFAULT_FORMAT "data"
class GPWriter : public Writer {
public:
GPWriter(const S3Params ¶ms, string fmt = S3_DEFAULT_FORMAT);
virtual ~GPWriter() {
this->close();
}
virtual void open(const S3Params ¶ms);
// 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);
// This should be reentrant, has no side effects when called multiple times.
virtual void close();
string getKeyUrlToUpload() {
return this->params.getS3Url().getFullUrlForCurl();
}
private:
string constructRandomStr();
string genUniqueKeyName(const S3Url &s3Url);
protected:
string format;
S3Params params;
S3RESTfulService restfulService;
S3InterfaceService s3InterfaceService;
S3CommonWriter commonWriter;
// it links to itself by default
// but the pointer here leaves a chance to mock it in unit test
S3RESTfulService *restfulServicePtr;
};
// Following 3 functions are invoked by s3_export(), need to be exception safe
GPWriter *writer_init(const char *url_with_options, const char *format = S3_DEFAULT_FORMAT);
bool writer_transfer_data(GPWriter *writer, char *data_buf, int data_len);
bool writer_cleanup(GPWriter **writer);
#endif /* INCLUDE_GPWRITER_H_ */
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