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#include <IO/ForkWriteBuffer.h>
#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_CREATE_IO_BUFFER;
}
ForkWriteBuffer::ForkWriteBuffer(WriteBufferPtrs && sources_)
: WriteBuffer(nullptr, 0), sources(std::move(sources_))
{
if (sources.empty())
{
throw Exception(ErrorCodes::CANNOT_CREATE_IO_BUFFER, "Expected non-zero number of buffers for `ForkWriteBuffer`");
}
set(sources.front()->buffer().begin(), sources.front()->buffer().size());
}
void ForkWriteBuffer::nextImpl()
{
sources.front()->position() = position();
try
{
auto & source_buffer = sources.front();
for (auto it = sources.begin() + 1; it != sources.end(); ++it)
{
auto & buffer = *it;
buffer->write(source_buffer->buffer().begin(), source_buffer->offset());
buffer->next();
}
source_buffer->next();
}
catch (Exception & exception)
{
exception.addMessage("While writing to ForkWriteBuffer");
throw;
}
}
void ForkWriteBuffer::finalizeImpl()
{
for (const WriteBufferPtr & buffer : sources)
{
buffer->finalize();
}
}
ForkWriteBuffer::~ForkWriteBuffer()
{
finalize();
}
}
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