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#include <IO/WriteHelpers.h>
#include <QueryPipeline/Chain.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
static void checkSingleInput(const IProcessor & transform)
{
if (transform.getInputs().size() != 1)
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Transform for chain should have single input, but {} has {} inputs",
transform.getName(),
transform.getInputs().size());
if (transform.getInputs().front().isConnected())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Transform for chain has connected input");
}
static void checkSingleOutput(const IProcessor & transform)
{
if (transform.getOutputs().size() != 1)
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Transform for chain should have single output, but {} has {} outputs",
transform.getName(),
transform.getOutputs().size());
if (transform.getOutputs().front().isConnected())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Transform for chain has connected output");
}
static void checkTransform(const IProcessor & transform)
{
checkSingleInput(transform);
checkSingleOutput(transform);
}
static void checkInitialized(const std::list<ProcessorPtr> & processors)
{
if (processors.empty())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Chain is not initialized");
}
Chain::Chain(ProcessorPtr processor)
{
checkTransform(*processor);
processors.emplace_back(std::move(processor));
}
Chain::Chain(std::list<ProcessorPtr> processors_) : processors(std::move(processors_))
{
if (processors.empty())
return;
checkSingleInput(*processors.front());
checkSingleOutput(*processors.back());
for (const auto & processor : processors)
{
for (const auto & input : processor->getInputs())
if (&input != &getInputPort() && !input.isConnected())
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cannot initialize chain because there is a disconnected input for {}",
processor->getName());
for (const auto & output : processor->getOutputs())
if (&output != &getOutputPort() && !output.isConnected())
throw Exception(
ErrorCodes::LOGICAL_ERROR,
"Cannot initialize chain because there is a disconnected output for {}",
processor->getName());
}
}
void Chain::addSource(ProcessorPtr processor)
{
checkTransform(*processor);
if (!processors.empty())
connect(processor->getOutputs().front(), getInputPort());
processors.emplace_front(std::move(processor));
}
void Chain::addSink(ProcessorPtr processor)
{
checkTransform(*processor);
if (!processors.empty())
connect(getOutputPort(), processor->getInputs().front());
processors.emplace_back(std::move(processor));
}
void Chain::appendChain(Chain chain)
{
connect(getOutputPort(), chain.getInputPort());
processors.splice(processors.end(), std::move(chain.processors));
attachResources(chain.detachResources());
num_threads += chain.num_threads;
}
IProcessor & Chain::getSource()
{
checkInitialized(processors);
return *processors.front();
}
IProcessor & Chain::getSink()
{
checkInitialized(processors);
return *processors.back();
}
InputPort & Chain::getInputPort() const
{
checkInitialized(processors);
return processors.front()->getInputs().front();
}
OutputPort & Chain::getOutputPort() const
{
checkInitialized(processors);
return processors.back()->getOutputs().front();
}
void Chain::reset()
{
Chain to_remove = std::move(*this);
*this = Chain();
}
}
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