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#include <Processors/DelayedPortsProcessor.h>
#include <base/sort.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
InputPorts createInputPorts(
const Block & header,
size_t num_ports,
IProcessor::PortNumbers delayed_ports,
bool assert_main_ports_empty)
{
if (!assert_main_ports_empty)
return InputPorts(num_ports, header);
InputPorts res;
::sort(delayed_ports.begin(), delayed_ports.end());
size_t next_delayed_port = 0;
for (size_t i = 0; i < num_ports; ++i)
{
if (next_delayed_port < delayed_ports.size() && i == delayed_ports[next_delayed_port])
{
res.emplace_back(header);
++next_delayed_port;
}
else
res.emplace_back(Block());
}
return res;
}
DelayedPortsProcessor::DelayedPortsProcessor(
const Block & header, size_t num_ports, const PortNumbers & delayed_ports, bool assert_main_ports_empty)
: IProcessor(createInputPorts(header, num_ports, delayed_ports, assert_main_ports_empty),
OutputPorts((assert_main_ports_empty ? delayed_ports.size() : num_ports), header))
, num_delayed_ports(delayed_ports.size())
{
port_pairs.resize(num_ports);
output_to_pair.reserve(outputs.size());
for (const auto & delayed : delayed_ports)
port_pairs[delayed].is_delayed = true;
auto input_it = inputs.begin();
auto output_it = outputs.begin();
for (size_t i = 0; i < num_ports; ++i)
{
port_pairs[i].input_port = &*input_it;
++input_it;
if (port_pairs[i].is_delayed || !assert_main_ports_empty)
{
port_pairs[i].output_port = &*output_it;
output_to_pair.push_back(i);
++output_it;
}
}
}
void DelayedPortsProcessor::finishPair(PortsPair & pair)
{
if (!pair.is_finished)
{
if (pair.output_port)
pair.output_port->finish();
pair.input_port->close();
pair.is_finished = true;
++num_finished_inputs;
if (pair.output_port)
++num_finished_outputs;
if (!pair.is_delayed)
++num_finished_main_inputs;
}
}
bool DelayedPortsProcessor::processPair(PortsPair & pair)
{
if (pair.output_port && pair.output_port->isFinished())
{
finishPair(pair);
return false;
}
if (pair.input_port->isFinished())
{
finishPair(pair);
return false;
}
if (pair.output_port && !pair.output_port->canPush())
return false;
pair.input_port->setNeeded();
if (pair.input_port->hasData())
{
if (!pair.output_port)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Input port for DelayedPortsProcessor is assumed to have no data, but it has one");
pair.output_port->pushData(pair.input_port->pullData(true));
}
return true;
}
bool DelayedPortsProcessor::shouldSkipDelayed() const
{
return num_finished_main_inputs + num_delayed_ports < port_pairs.size();
}
IProcessor::Status DelayedPortsProcessor::prepare(const PortNumbers & updated_inputs, const PortNumbers & updated_outputs)
{
bool skip_delayed = shouldSkipDelayed();
bool need_data = false;
if (!are_inputs_initialized && !updated_outputs.empty())
{
/// Activate inputs with no output.
for (const auto & pair : port_pairs)
if (!pair.output_port)
pair.input_port->setNeeded();
are_inputs_initialized = true;
}
for (const auto & output_number : updated_outputs)
{
auto & pair = port_pairs[output_to_pair[output_number]];
/// Finish pair of ports earlier if possible.
if (!pair.is_finished && pair.output_port && pair.output_port->isFinished())
finishPair(pair);
else if (!skip_delayed || !pair.is_delayed)
need_data = processPair(pair) || need_data;
}
/// Do not wait for delayed ports if all output ports are finished.
if (num_finished_outputs == outputs.size())
{
for (auto & pair : port_pairs)
finishPair(pair);
return Status::Finished;
}
for (const auto & input_number : updated_inputs)
{
if (!skip_delayed || !port_pairs[input_number].is_delayed)
need_data = processPair(port_pairs[input_number]) || need_data;
}
/// In case if main streams are finished at current iteration, start processing delayed streams.
if (skip_delayed && !shouldSkipDelayed())
{
for (auto & pair : port_pairs)
if (pair.is_delayed)
need_data = processPair(pair) || need_data;
}
if (num_finished_inputs == port_pairs.size())
return Status::Finished;
if (need_data)
return Status::NeedData;
return Status::PortFull;
}
}
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