bool statement::exec()
{
if ( !is_prepared() )
{
prepare();
}
try
{
int const r = ::sqlite3_step(impl_);
switch ( r )
{
case SQLITE_ROW:
// statement has result (select for ex.) - update into holders
std::for_each(q_.intos().begin(), q_.intos().end(), update(*this));
return s_.last_exec_ = true;
case SQLITE_DONE:
// reset statement to be ready for the next exec
s_.check_error( ::sqlite3_reset(impl_) );
return s_.last_exec_ = false;
default:
s_.check_error(r);
// should never return this
return false;
}
}
catch (std::exception const&)
{
finalize(false);
throw;
}
}
void statement::finalize(bool check_error) // throw
{
if ( is_prepared() )
{
int const r = ::sqlite3_finalize(impl_);
impl_ = 0;
if ( check_error ) s_.check_error(r);
}
}
void statement::reset(bool rebind)
{
if ( is_prepared() )
{
s_.check_error( ::sqlite3_reset(impl_) );
if ( rebind )
{
std::accumulate(q_.uses().begin(), q_.uses().end(), 1, bind(*this));
}
}
}
void replica::on_prepare(message_ptr& request)
{
check_hashed_access();
replica_configuration rconfig;
unmarshall(request, rconfig);
mutation_ptr mu = mutation::read_from(request);
decree decree = mu->data.header.decree;
ddebug( "%s: mutation %s on_prepare", name(), mu->name());
dassert (mu->data.header.ballot == rconfig.ballot, "");
if (mu->data.header.ballot < get_ballot())
{
ddebug( "%s: mutation %s on_prepare skipped due to old view", name(), mu->name());
return;
}
// update configuration when necessary
else if (rconfig.ballot > get_ballot())
{
update_local_configuration(rconfig);
}
if (PS_INACTIVE == status() || PS_ERROR == status())
{
ddebug(
"%s: mutation %s on_prepare to %s skipped",
name(), mu->name(),
enum_to_string(status())
);
ack_prepare_message(ERR_INVALID_STATE, mu);
return;
}
else if (PS_POTENTIAL_SECONDARY == status())
{
if (_potential_secondary_states.learning_status != LearningWithPrepare && _potential_secondary_states.learning_status != LearningSucceeded)
{
ddebug(
"%s: mutation %s on_prepare to %s skipped, learnings state = %s",
name(), mu->name(),
enum_to_string(status()),
enum_to_string(_potential_secondary_states.learning_status)
);
// do not retry as there may retries later
return;
}
}
dassert (rconfig.status == status(), "");
if (decree <= last_committed_decree())
{
ack_prepare_message(ERR_SUCCESS, mu);
return;
}
// real prepare start
auto mu2 = _prepare_list->get_mutation_by_decree(decree);
if (mu2 != nullptr && mu2->data.header.ballot == mu->data.header.ballot)
{
ddebug( "%s: mutation %s redundant prepare skipped", name(), mu->name());
if (mu2->is_prepared())
{
ack_prepare_message(ERR_SUCCESS, mu);
}
return;
}
int err = _prepare_list->prepare(mu, status());
dassert (err == ERR_SUCCESS, "");
if (PS_POTENTIAL_SECONDARY == status())
{
dassert (mu->data.header.decree <= last_committed_decree() + _options.staleness_for_start_prepare_for_potential_secondary, "");
}
else
{
dassert (PS_SECONDARY == status(), "");
dassert (mu->data.header.decree <= last_committed_decree() + _options.staleness_for_commit, "");
}
// write log
dassert (mu->log_task() == nullptr, "");
mu->log_task() = _stub->_log->append(mu,
LPC_WRITE_REPLICATION_LOG,
this,
std::bind(&replica::on_append_log_completed, this, mu, std::placeholders::_1, std::placeholders::_2),
gpid_to_hash(get_gpid())
);
if (nullptr == mu->log_task())
{
err = ERR_FILE_OPERATION_FAILED;
ack_prepare_message(err, mu);
handle_local_failure(err);
}
}