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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "i_move_operation_limiter.h"
#include <vespa/vespalib/util/idestructorcallback.h>
#include <memory>
#include <mutex>
namespace proton {
class IBlockableMaintenanceJob;
/**
* Class used to limit the number of outstanding move operations a blockable maintenance job can have.
*
* When crossing the boundary of max outstanding operations the job is blocked/unblocked.
* Create a destructor callback with beginOperation() and pass this to the component(s) responsible for handling the move operation.
* When this object is destructed (in any thread) the limiter is signaled and the job can be unblocked (if blocked).
*/
class MoveOperationLimiter : public IMoveOperationLimiter,
public std::enable_shared_from_this<MoveOperationLimiter> {
private:
using LockGuard = std::lock_guard<std::mutex>;
struct Callback;
mutable std::mutex _mutex;
IBlockableMaintenanceJob *_job;
uint32_t _outstandingOps;
const uint32_t _maxOutstandingOps;
bool isOnLimit(const LockGuard &guard) const;
void endOperation();
public:
using SP = std::shared_ptr<MoveOperationLimiter>;
MoveOperationLimiter(IBlockableMaintenanceJob *job, uint32_t maxOutstandingOps);
~MoveOperationLimiter() override;
void clearJob();
bool isAboveLimit() const { return numPending() >= _maxOutstandingOps; }
bool hasPending() const { return numPending() > 0;}
std::shared_ptr<vespalib::IDestructorCallback> beginOperation() override;
size_t numPending() const override;
};
}
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