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#pragma once
#include <memory>
#include <atomic>
#include <vector>
namespace DB
{
class Block;
class Chunk;
class QueryPipeline;
class PushingSource;
class PipelineExecutor;
using PipelineExecutorPtr = std::shared_ptr<PipelineExecutor>;
class IProcessor;
using ProcessorPtr = std::shared_ptr<IProcessor>;
using Processors = std::vector<ProcessorPtr>;
/// Pushing executor for Chain of processors. Always executed in single thread.
/// Typical usage is:
///
/// PushingPipelineExecutor executor(chain);
/// executor.start();
/// while (auto chunk = ...)
/// executor.push(std::move(chunk));
/// executor.finish();
class PushingPipelineExecutor
{
public:
explicit PushingPipelineExecutor(QueryPipeline & pipeline_);
~PushingPipelineExecutor();
/// Get structure of returned block or chunk.
const Block & getHeader() const;
void start();
void push(Chunk chunk);
void push(Block block);
void finish();
/// Stop execution. It is not necessary, but helps to stop execution before executor is destroyed.
void cancel();
private:
QueryPipeline & pipeline;
std::atomic_bool input_wait_flag = false;
std::shared_ptr<PushingSource> pushing_source;
PipelineExecutorPtr executor;
bool started = false;
bool finished = false;
};
}
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