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//===== Copyright � 1996-2005, Valve Corporation, All rights reserved. ======//
//
// Purpose: An application framework
//
// $Revision: $
// $NoKeywords: $
//===========================================================================//
#ifndef IAPPSYSTEM_H
#define IAPPSYSTEM_H
#ifdef COMPILER_MSVC
#pragma once
#endif
#include "tier1/interface.h"
#include "interfaces/interfaces.h"
//-----------------------------------------------------------------------------
// Specifies a module + interface name for initialization
//-----------------------------------------------------------------------------
struct AppSystemInfo_t
{
const char *m_pModuleName;
const char *m_pInterfaceName;
};
//-----------------------------------------------------------------------------
// Client systems are singleton objects in the client codebase responsible for
// various tasks
// The order in which the client systems appear in this list are the
// order in which they are initialized and updated. They are shut down in
// reverse order from which they are initialized.
//-----------------------------------------------------------------------------
enum InitReturnVal_t
{
INIT_FAILED = 0,
INIT_OK,
INIT_LAST_VAL,
};
enum AppSystemTier_t
{
APP_SYSTEM_TIER0 = 0,
APP_SYSTEM_TIER1,
APP_SYSTEM_TIER2,
APP_SYSTEM_TIER3,
APP_SYSTEM_TIER_OTHER,
};
abstract_class IAppSystem
{
public:
// Here's where the app systems get to learn about each other
virtual bool Connect( CreateInterfaceFn factory ) = 0;
virtual void Disconnect() = 0;
// Here's where systems can access other interfaces implemented by this object
// Returns NULL if it doesn't implement the requested interface
virtual void *QueryInterface( const char *pInterfaceName ) = 0;
// Init, shutdown
virtual InitReturnVal_t Init() = 0;
virtual void Shutdown() = 0;
// Returns all dependent libraries
virtual const AppSystemInfo_t* GetDependencies() = 0;
// Returns the tier
virtual AppSystemTier_t GetTier() = 0;
// Reconnect to a particular interface
virtual void Reconnect( CreateInterfaceFn factory, const char *pInterfaceName ) = 0;
};
//-----------------------------------------------------------------------------
// Helper empty implementation of an IAppSystem
//-----------------------------------------------------------------------------
template< class IInterface >
class CBaseAppSystem : public IInterface
{
public:
// Here's where the app systems get to learn about each other
virtual bool Connect( CreateInterfaceFn factory ) { return true; }
virtual void Disconnect() {}
// Here's where systems can access other interfaces implemented by this object
// Returns NULL if it doesn't implement the requested interface
virtual void *QueryInterface( const char *pInterfaceName ) { return NULL; }
// Init, shutdown
virtual InitReturnVal_t Init() { return INIT_OK; }
virtual void Shutdown() {}
virtual const AppSystemInfo_t* GetDependencies() { return NULL; }
virtual AppSystemTier_t GetTier() { return APP_SYSTEM_TIER_OTHER; }
virtual void Reconnect( CreateInterfaceFn factory, const char *pInterfaceName )
{
ReconnectInterface( factory, pInterfaceName );
}
};
//-----------------------------------------------------------------------------
// Helper implementation of an IAppSystem for tier0
//-----------------------------------------------------------------------------
template< class IInterface >
class CTier0AppSystem : public CBaseAppSystem< IInterface >
{
};
#endif // IAPPSYSTEM_H
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