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#include <Processors/IAccumulatingTransform.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
IAccumulatingTransform::IAccumulatingTransform(Block input_header, Block output_header)
: IProcessor({std::move(input_header)}, {std::move(output_header)}),
input(inputs.front()), output(outputs.front())
{
}
IAccumulatingTransform::Status IAccumulatingTransform::prepare()
{
/// Check can output.
if (output.isFinished())
{
for (auto & in : inputs)
in.close();
return Status::Finished;
}
if (!output.canPush())
{
input.setNotNeeded();
return Status::PortFull;
}
/// Output if has data.
if (current_output_chunk)
output.push(std::move(current_output_chunk));
if (finished_generate)
{
output.finish();
return Status::Finished;
}
if (input.isFinished())
finished_input = true;
if (finished_input)
{
/// Close input if flag was set manually.
input.close();
/// Read from totals port if has it.
if (inputs.size() > 1)
{
auto & totals_input = inputs.back();
if (!totals_input.isFinished())
{
totals_input.setNeeded();
if (!totals_input.hasData())
return Status::NeedData;
totals = totals_input.pull();
totals_input.close();
}
}
/// Generate output block.
return Status::Ready;
}
/// Check can input.
if (!has_input)
{
input.setNeeded();
if (!input.hasData())
return Status::NeedData;
current_input_chunk = input.pull();
has_input = true;
}
return Status::Ready;
}
void IAccumulatingTransform::work()
{
if (!finished_input)
{
consume(std::move(current_input_chunk));
has_input = false;
}
else
{
current_output_chunk = generate();
if (!current_output_chunk)
finished_generate = true;
}
}
void IAccumulatingTransform::setReadyChunk(Chunk chunk)
{
if (current_output_chunk)
throw Exception(ErrorCodes::LOGICAL_ERROR,
"IAccumulatingTransform already has input. "
"Cannot set another chunk. Probably, setReadyChunk method was called twice per consume().");
current_output_chunk = std::move(chunk);
}
}
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