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htKeyScanner.cpp
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htKeyScanner.cpp
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#include "htKeyScanner.h"
#include "htConnPool.h"
htKeyScanner::htKeyScanner(htConnPoolPtr conn_pool,
std::string _ns,
std::string table,
const KeyRange range)
{
m_last_key = "";
m_table = table;
m_conn_pool = conn_pool;
m_ss.keys_only=true;
m_ss.__isset.keys_only = true;
htConnPool::htSession sess = m_conn_pool->get();
m_ns = sess.client->namespace_open(_ns);
if (range.ok())
{
Hypertable::ThriftGen::RowInterval interval;
interval.__isset.start_row = true;
interval.__isset.end_row = true;
interval.__isset.start_inclusive = true;
interval.__isset.end_inclusive = true;
interval.start_row = range.beg;
interval.end_row = range.end;
interval.start_inclusive = true;
interval.end_inclusive = true;
m_ss.__isset.row_intervals = true;
std::vector<Hypertable::ThriftGen::RowInterval> intervals;
intervals.push_back(interval);
m_ss.__set_row_intervals(intervals);
}
reset(sess);
}
void htKeyScanner::reset(htConnPool::htSession sess)
{
m_s = sess.client->open_scanner(m_ns, m_table, m_ss);
while (buffer.size()!=0)
buffer.pop();
loadMore(sess);
}
void htKeyScanner::reset(const KeyRange &range)
{
if (range.ok())
{
Hypertable::ThriftGen::RowInterval interval;
interval.__isset.start_row = true;
interval.__isset.end_row = true;
interval.__isset.start_inclusive = true;
interval.__isset.end_inclusive = true;
interval.start_row = range.beg;
interval.end_row = range.end;
interval.start_inclusive = true;
interval.end_inclusive = true;
m_ss.__isset.row_intervals = true;
std::vector<Hypertable::ThriftGen::RowInterval> intervals;
intervals.push_back(interval);
m_ss.__set_row_intervals(intervals);
}
htConnPool::htSession sess = m_conn_pool->get();
reset(sess);
}
void htKeyScanner::reset()
{
htConnPool::htSession sess = m_conn_pool->get();
reset(sess);
}
void htKeyScanner::loadMore(htConnPool::htSession sess)
{
std::vector<Hypertable::ThriftGen::Cell> cells;
//sess.client->scanner_get_cells(cells, m_s);
try {
sess.client->next_cells(cells, m_s);
} catch (Hypertable::ThriftGen::ClientException &e) {
std::cout << "thrift exception: " << e << std::endl;
} catch (...) {
std::cout << "thrift unknown exception ";
}
if (cells.size()==0) {
return;
}
for (int i = 0; i<cells.size(); i++) {
if (m_last_key != cells[i].key.row) {
buffer.push(cells[i].key.row);
m_last_key = cells[i].key.row;
}
}
cells.clear();
}
std::string htKeyScanner::getNextKey()
{
if (buffer.size()!=0)
{
std::string k = buffer.front();
buffer.pop();
if (buffer.size()<4096)
{
htConnPool::htSession sess = m_conn_pool->get();
//for (int i = 0; i<10; i++)
loadMore(sess);
}
return k;
}
else
{
throw std::string("htCollScanner::getNextCell() buffer empty");
}
}
bool htKeyScanner::end()
{
return buffer.size()==0;
}
htKeyScanner::~htKeyScanner()
{
//m_client->scanner_close(m_s);
}