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#include <Processors/Executors/PushingPipelineExecutor.h>
#include <Processors/Executors/PipelineExecutor.h>
#include <Processors/ISource.h>
#include <QueryPipeline/QueryPipeline.h>
#include <QueryPipeline/ReadProgressCallback.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
class PushingSource : public ISource
{
public:
explicit PushingSource(const Block & header, std::atomic_bool & input_wait_flag_)
: ISource(header)
, input_wait_flag(input_wait_flag_)
{}
String getName() const override { return "PushingSource"; }
void setData(Chunk chunk)
{
input_wait_flag = false;
data = std::move(chunk);
}
protected:
Status prepare() override
{
auto status = ISource::prepare();
if (status == Status::Ready)
input_wait_flag = true;
return status;
}
Chunk generate() override
{
return std::move(data);
}
private:
Chunk data;
std::atomic_bool & input_wait_flag;
};
PushingPipelineExecutor::PushingPipelineExecutor(QueryPipeline & pipeline_) : pipeline(pipeline_)
{
if (!pipeline.pushing())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Pipeline for PushingPipelineExecutor must be pushing");
pushing_source = std::make_shared<PushingSource>(pipeline.input->getHeader(), input_wait_flag);
connect(pushing_source->getPort(), *pipeline.input);
pipeline.processors->emplace_back(pushing_source);
}
PushingPipelineExecutor::~PushingPipelineExecutor()
{
/// It must be finalized explicitly. Otherwise we cancel it assuming it's due to an exception.
chassert(finished || std::uncaught_exceptions() || std::current_exception());
try
{
cancel();
}
catch (...)
{
tryLogCurrentException("PushingPipelineExecutor");
}
}
const Block & PushingPipelineExecutor::getHeader() const
{
return pushing_source->getPort().getHeader();
}
void PushingPipelineExecutor::start()
{
if (started)
return;
started = true;
executor = std::make_shared<PipelineExecutor>(pipeline.processors, pipeline.process_list_element);
executor->setReadProgressCallback(pipeline.getReadProgressCallback());
if (!executor->executeStep(&input_wait_flag))
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Pipeline for PushingPipelineExecutor was finished before all data was inserted");
}
void PushingPipelineExecutor::push(Chunk chunk)
{
if (!started)
start();
pushing_source->setData(std::move(chunk));
if (!executor->executeStep(&input_wait_flag))
throw Exception(ErrorCodes::LOGICAL_ERROR,
"Pipeline for PushingPipelineExecutor was finished before all data was inserted");
}
void PushingPipelineExecutor::push(Block block)
{
push(Chunk(block.getColumns(), block.rows()));
}
void PushingPipelineExecutor::finish()
{
if (finished)
return;
finished = true;
if (executor)
executor->executeStep();
}
void PushingPipelineExecutor::cancel()
{
/// Cancel execution if it wasn't finished.
if (executor && !finished)
{
finished = true;
executor->cancel();
}
}
}
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