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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#ifndef ICE_GRID_ALLOCATABLE_H
#define ICE_GRID_ALLOCATABLE_H
#include <IceUtil/Timer.h>
#include <IceGrid/Session.h>
#include <list>
#include <set>
namespace IceGrid
{
class Allocatable;
class SessionI;
class AllocationRequest : public IceUtil::TimerTask, public std::enable_shared_from_this<AllocationRequest>
{
public:
virtual ~AllocationRequest() = default;
virtual void allocated(const std::shared_ptr<Allocatable>&, const std::shared_ptr<SessionI>&) = 0;
virtual void canceled(std::exception_ptr) = 0;
bool pending();
bool allocate(const std::shared_ptr<Allocatable>&, const std::shared_ptr<SessionI>&);
void cancel(std::exception_ptr);
void runTimerTask() override;
int getTimeout() const { return _timeout; }
const std::shared_ptr<SessionI>& getSession() const { return _session; }
bool isCanceled() const;
bool operator<(const AllocationRequest&) const;
protected:
AllocationRequest(const std::shared_ptr<SessionI>&);
private:
enum State
{
Initial,
Pending,
Canceled,
Allocated
};
const std::shared_ptr<SessionI> _session;
const int _timeout;
State _state;
mutable std::mutex _mutex;
};
class Allocatable: public virtual std::enable_shared_from_this<Allocatable>
{
public:
Allocatable(bool, const std::shared_ptr<Allocatable>&);
virtual ~Allocatable() = default;
virtual void checkAllocatable();
virtual bool allocate(const std::shared_ptr<AllocationRequest>&, bool = false);
virtual bool tryAllocate(const std::shared_ptr<AllocationRequest>&, bool = false);
virtual void release(const std::shared_ptr<SessionI>&, bool = false);
bool isAllocatable() const { return _allocatable; }
std::shared_ptr<SessionI> getSession() const;
virtual bool isEnabled() const = 0;
virtual void allocated(const std::shared_ptr<SessionI>&) = 0;
virtual void released(const std::shared_ptr<SessionI>&) = 0;
virtual bool canTryAllocate() { return false; }
virtual void allocatedNoSync(const std::shared_ptr<SessionI>&) {}
virtual void releasedNoSync(const std::shared_ptr<SessionI>&) {}
bool operator<(const Allocatable&) const;
protected:
bool allocate(const std::shared_ptr<AllocationRequest>&, bool, bool);
void queueAllocationAttemptFromChild(const std::shared_ptr<Allocatable>&);
bool allocateFromChild(const std::shared_ptr<AllocationRequest>&, const std::shared_ptr<Allocatable>&, bool, bool);
void queueAllocationAttempt(const std::shared_ptr<Allocatable>&, const std::shared_ptr<AllocationRequest>&, bool);
std::shared_ptr<Allocatable> dequeueAllocationAttempt(std::shared_ptr<AllocationRequest>&);
bool _allocatable;
const std::shared_ptr<Allocatable> _parent;
std::list<std::pair<std::shared_ptr<Allocatable>, std::shared_ptr<AllocationRequest>>> _requests;
std::shared_ptr<SessionI> _session;
int _count;
bool _releasing;
mutable std::mutex _mutex;
std::condition_variable _condVar;
};
};
#endif
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