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#include <Disks/ObjectStorages/ObjectStorageIteratorAsync.h>
#include <Common/logger_useful.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
}
void IObjectStorageIteratorAsync::nextBatch()
{
std::lock_guard lock(mutex);
if (!is_finished)
{
if (!is_initialized)
{
outcome_future = scheduleBatch();
is_initialized = true;
}
BatchAndHasNext next_batch = outcome_future.get();
current_batch = std::move(next_batch.batch);
accumulated_size.fetch_add(current_batch.size(), std::memory_order_relaxed);
current_batch_iterator = current_batch.begin();
if (next_batch.has_next)
outcome_future = scheduleBatch();
else
is_finished = true;
}
else
{
current_batch.clear();
current_batch_iterator = current_batch.begin();
}
}
void IObjectStorageIteratorAsync::next()
{
std::lock_guard lock(mutex);
if (current_batch_iterator != current_batch.end())
{
++current_batch_iterator;
}
else if (!is_finished)
{
if (outcome_future.valid())
{
BatchAndHasNext next_batch = outcome_future.get();
current_batch = std::move(next_batch.batch);
accumulated_size.fetch_add(current_batch.size(), std::memory_order_relaxed);
current_batch_iterator = current_batch.begin();
if (next_batch.has_next)
outcome_future = scheduleBatch();
else
is_finished = true;
}
}
}
std::future<IObjectStorageIteratorAsync::BatchAndHasNext> IObjectStorageIteratorAsync::scheduleBatch()
{
return list_objects_scheduler([this]
{
BatchAndHasNext result;
result.has_next = getBatchAndCheckNext(result.batch);
return result;
}, Priority{});
}
bool IObjectStorageIteratorAsync::isValid()
{
if (!is_initialized)
nextBatch();
std::lock_guard lock(mutex);
return current_batch_iterator != current_batch.end();
}
RelativePathWithMetadata IObjectStorageIteratorAsync::current()
{
if (!isValid())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Trying to access invalid iterator");
std::lock_guard lock(mutex);
return *current_batch_iterator;
}
RelativePathsWithMetadata IObjectStorageIteratorAsync::currentBatch()
{
if (!isValid())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Trying to access invalid iterator");
std::lock_guard lock(mutex);
return current_batch;
}
std::optional<RelativePathsWithMetadata> IObjectStorageIteratorAsync::getCurrrentBatchAndScheduleNext()
{
std::lock_guard lock(mutex);
if (!is_initialized)
nextBatch();
if (current_batch_iterator != current_batch.end())
{
auto temp_current_batch = current_batch;
nextBatch();
return temp_current_batch;
}
return std::nullopt;
}
size_t IObjectStorageIteratorAsync::getAccumulatedSize() const
{
return accumulated_size.load(std::memory_order_relaxed);
}
}
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