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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
#ifndef ICE_GRID_ALLOCATABLE_H
#define ICE_GRID_ALLOCATABLE_H
#include <IceUtil/Handle.h>
#include <IceUtil/Mutex.h>
#include <IceUtil/Shared.h>
#include <IceUtil/Time.h>
#include <IceUtil/Timer.h>
#include <IceGrid/Session.h>
#include <list>
#include <set>
namespace IceGrid
{
class SessionI;
typedef IceUtil::Handle<SessionI> SessionIPtr;
class Allocatable;
typedef IceUtil::Handle<Allocatable> AllocatablePtr;
class AllocationRequest : public IceUtil::Mutex, public IceUtil::TimerTask
{
public:
virtual ~AllocationRequest();
virtual void allocated(const AllocatablePtr&, const SessionIPtr&) = 0;
virtual void canceled(const Ice::UserException&) = 0;
bool pending();
bool allocate(const AllocatablePtr&, const SessionIPtr&);
void cancel(const Ice::UserException&);
void runTimerTask(); // Implementation of IceUtil::TimerTask::runTimerTask()
int getTimeout() const { return _timeout; }
const SessionIPtr& getSession() const { return _session; }
bool isCanceled() const;
bool operator<(const AllocationRequest&) const;
protected:
AllocationRequest(const SessionIPtr&);
private:
enum State
{
Initial,
Pending,
Canceled,
Allocated
};
const SessionIPtr _session;
const int _timeout;
State _state;
};
typedef IceUtil::Handle<AllocationRequest> AllocationRequestPtr;
class Allocatable : public virtual IceUtil::Shared, public IceUtil::Monitor<IceUtil::Mutex>
{
public:
Allocatable(bool, const AllocatablePtr&);
virtual ~Allocatable();
virtual void checkAllocatable();
virtual bool allocate(const AllocationRequestPtr&, bool = false);
virtual bool tryAllocate(const AllocationRequestPtr&, bool = false);
virtual void release(const SessionIPtr&, bool = false);
bool isAllocatable() const { return _allocatable; }
SessionIPtr getSession() const;
virtual bool isEnabled() const = 0;
virtual void allocated(const SessionIPtr&) = 0;
virtual void released(const SessionIPtr&) = 0;
virtual bool canTryAllocate() { return false; }
virtual void allocatedNoSync(const SessionIPtr&) { ; }
virtual void releasedNoSync(const SessionIPtr&) { ; }
bool operator<(const Allocatable&) const;
protected:
bool allocate(const AllocationRequestPtr&, bool, bool);
void queueAllocationAttemptFromChild(const AllocatablePtr&);
bool allocateFromChild(const AllocationRequestPtr&, const AllocatablePtr&, bool, bool);
void queueAllocationAttempt(const AllocatablePtr&, const AllocationRequestPtr&, bool);
AllocatablePtr dequeueAllocationAttempt(AllocationRequestPtr&);
bool _allocatable;
const AllocatablePtr _parent;
std::list<std::pair<AllocatablePtr, AllocationRequestPtr> > _requests;
SessionIPtr _session;
int _count;
bool _releasing;
};
};
#endif
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