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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "i_blockable_maintenance_job.h"
#include "move_operation_limiter.h"
#include <cassert>
namespace proton {
using BlockedReason = IBlockableMaintenanceJob::BlockedReason;
struct MoveOperationLimiter::Callback : public vespalib::IDestructorCallback {
MoveOperationLimiter::SP _limiter;
Callback(MoveOperationLimiter::SP limiter) noexcept : _limiter(std::move(limiter)) {}
~Callback() override { _limiter->endOperation(); }
};
bool
MoveOperationLimiter::isOnLimit(const LockGuard &) const
{
return (_outstandingOps == _maxOutstandingOps);
}
void
MoveOperationLimiter::endOperation()
{
LockGuard guard(_mutex);
bool considerUnblock = isOnLimit(guard);
assert(_outstandingOps > 0);
--_outstandingOps;
if (_job && considerUnblock) {
_job->unBlock(BlockedReason::OUTSTANDING_OPS);
}
}
MoveOperationLimiter::MoveOperationLimiter(IBlockableMaintenanceJob *job,
uint32_t maxOutstandingOps)
: _mutex(),
_job(job),
_outstandingOps(0),
_maxOutstandingOps(maxOutstandingOps)
{
}
MoveOperationLimiter::~MoveOperationLimiter() = default;
void
MoveOperationLimiter::clearJob()
{
LockGuard guard(_mutex);
_job = nullptr;
}
size_t
MoveOperationLimiter::numPending() const
{
LockGuard guard(_mutex);
return _outstandingOps;
}
std::shared_ptr<vespalib::IDestructorCallback>
MoveOperationLimiter::beginOperation()
{
LockGuard guard(_mutex);
++_outstandingOps;
if (_job && isOnLimit(guard)) {
_job->setBlocked(BlockedReason::OUTSTANDING_OPS);
}
MoveOperationLimiter::SP thisPtr = shared_from_this();
return std::make_shared<Callback>(std::move(thisPtr));
}
}
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