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// **********************************************************************
//
// Copyright (c) 2003-2006 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef ICE_GRID_ALLOCATABLE_H
#define ICE_GRID_ALLOCATABLE_H
#include <IceUtil/Handle.h>
#include <IceUtil/RecMutex.h>
#include <IceUtil/Shared.h>
#include <IceUtil/Time.h>
#include <IceGrid/WaitQueue.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 WaitItem
{
public:
virtual ~AllocationRequest();
virtual void allocated(const AllocatablePtr&) = 0;
virtual void canceled(const AllocationException&) = 0;
virtual bool allocateOnce() { return false; }
bool pending();
bool finish(const AllocatablePtr&);
void cancel(const AllocationException&);
void expired(bool);
int getTimeout() const { return _timeout; }
const SessionIPtr& getSession() const { return _session; }
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 ParentAllocationRequest : public AllocationRequest
{
public:
ParentAllocationRequest(const AllocationRequestPtr&, const AllocatablePtr&);
virtual void allocated(const AllocatablePtr&);
virtual void canceled(const AllocationException&);
private:
const AllocationRequestPtr _request;
const AllocatablePtr _allocatable;
};
class Allocatable : public IceUtil::Shared
{
public:
Allocatable();
virtual ~Allocatable();
virtual void allocate(const AllocationRequestPtr&, bool = true);
virtual bool tryAllocate(const AllocationRequestPtr&);
virtual bool release(const SessionIPtr&);
bool allocatable() const { return _allocatable; }
bool isAllocated() const;
SessionIPtr getSession() const;
virtual void allocated(const SessionIPtr&) { }
virtual void released(const SessionIPtr&) { }
bool operator<(const Allocatable&) const;
protected:
bool tryAllocateWithSession(const SessionIPtr&, const AllocatablePtr&);
bool release(const SessionIPtr&, bool, std::set<AllocatablePtr>&);
bool _allocatable;
AllocatablePtr _parent;
IceUtil::RecMutex _allocateMutex;
std::list<AllocationRequestPtr> _requests;
SessionIPtr _session;
int _count;
std::set<AllocatablePtr> _attempts;
};
};
#endif
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