ClickHouse/dbms/include/DB/Dictionaries/OwningBufferBlockInputStream.h
2016-06-07 11:23:15 +03:00

34 lines
850 B
C++

#pragma once
#include <DB/IO/ReadBuffer.h>
#include <DB/DataStreams/IProfilingBlockInputStream.h>
#include <memory>
namespace DB
{
/** Provides reading from a Buffer, taking exclusive ownership over it's lifetime,
* simplifies usage of ReadBufferFromFile (no need to manage buffer lifetime) etc.
*/
class OwningBufferBlockInputStream : public IProfilingBlockInputStream
{
public:
OwningBufferBlockInputStream(const BlockInputStreamPtr & stream, std::unique_ptr<ReadBuffer> buffer)
: stream{stream}, buffer{std::move(buffer)}
{
children.push_back(stream);
}
private:
Block readImpl() override { return stream->read(); }
String getName() const override { return "OwningBuffer"; }
String getID() const override { return "OwningBuffer(" + stream->getID() + ")"; }
BlockInputStreamPtr stream;
std::unique_ptr<ReadBuffer> buffer;
};
}