greenplumn gpreader 源码
greenplumn gpreader 代码
文件路径：/gpcontrib/gpcloud/include/gpreader.h
#ifndef __GP_READER_H__
#define __GP_READER_H__
#include "reader.h"
#include "s3bucket_reader.h"
#include "s3common_headers.h"
#include "s3common_reader.h"
#include "s3interface.h"
#include "s3log.h"
#include "s3macros.h"
#include "s3utils.h"
class GPReader : public Reader {
public:
GPReader(const S3Params ¶ms);
virtual ~GPReader() {
this->close();
}
virtual void open(const S3Params ¶ms);
// read() attempts to read up to count bytes into the buffer.
// Return 0 if EOF. Throw exception if encounters errors.
virtual uint64_t read(char *buf, uint64_t count);
// This should be reentrant, has no side effects when called multiple times.
virtual void close();
const ListBucketResult &getKeyList() {
return bucketReader.getKeyList();
}
const S3Params &getParams() {
return params;
}
protected:
S3Params params;
S3BucketReader bucketReader;
S3CommonReader commonReader;
S3RESTfulService restfulService;
S3InterfaceService s3InterfaceService;
// 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_import(), need to be exception safe
GPReader *reader_init(const char *url_with_options);
bool reader_transfer_data(GPReader *reader, char *data_buf, int &data_len);
bool reader_cleanup(GPReader **reader);
// Two thread related functions, called only by gpreader and gpcheckcloud
int thread_setup(void);
int thread_cleanup(void);
#endif
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