void RO6DTxn::start_ro(
const RequestHeader &header,
const std::vector<mdb::Value> &input,
std::vector<mdb::Value> &output,
rrr::DeferredReply *defer
) {
// RCCDTxn::start_ro(header, input, output, defer);
conflict_txns_.clear();
auto txn_handler_pair = TxnRegistry::get(header.t_type, header.p_type);
int output_size = 300;
output.resize(output_size);
int res;
phase_ = 1;
txn_handler_pair.txn_handler(this, header, input.data(), input.size(), &res,
output.data(), &output_size, NULL);
// get conflicting transactions
std::vector<TxnInfo*> &conflict_txns = conflict_txns_;
// TODO callback: read the value and return.
std::function<void(void)> cb = [&header, &input, &output, defer, this] () {
int res;
int output_size = 300;
this->phase_ = 2;
auto txn_handler_pair = TxnRegistry::get(header.t_type, header.p_type);
txn_handler_pair.txn_handler(this, header, input.data(), input.size(),
&res, output.data(), &output_size, NULL);
output.resize(output_size);
defer->reply();
};
// wait for them become commit.
DragonBall *ball = new DragonBall(conflict_txns.size() + 1, cb);
for (auto tinfo: conflict_txns) {
tinfo->register_event(TXN_DCD, ball);
}
ball->trigger();
// TODO: for Shuai, this does everything read transactions need in
// start phase. See the comments to its declaration in dtxn.hpp
// It needs txn_id, row, and column_id for this txn, please implement the
// interface for that.
// This function also returns the value for this read, since read txn returns
// value in start phase (no commit phase). So please also handle the return type
// of start_ro
// comment it out for now for compiling
/*Value result = do_ro(txn_id, &row, col_id);*/
}
static int
ssn_handler(TSCont contp, TSEvent event, void *edata)
{
TSHttpSsn ssnp;
TSHttpTxn txnp;
switch (event) {
case TS_EVENT_HTTP_SSN_START:
ssnp = (TSHttpSsn)edata;
handle_session(ssnp, contp);
TSHttpSsnReenable(ssnp, TS_EVENT_HTTP_CONTINUE);
return 0;
case TS_EVENT_HTTP_TXN_START:
txnp = (TSHttpTxn)edata;
txn_handler(txnp, contp);
TSHttpTxnReenable(txnp, TS_EVENT_HTTP_CONTINUE);
return 0;
default:
TSDebug("tag_session", "In the default case: event = %d", event);
break;
}
return 0;
}
