TF2-Source-Code/tf2_src/public/appframework/IAppSystem.h at master · sr2echa/TF2-Source-Code · GitHub

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// Purpose: An application framework

// $Revision: $

// $NoKeywords: $

//=============================================================================//

#ifndef IAPPSYSTEM_H

#define IAPPSYSTEM_H

#ifdef _WIN32

#pragma once

#endif

#include "tier1/interface.h"

//-----------------------------------------------------------------------------

// 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,

};

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;

};

//-----------------------------------------------------------------------------

// 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() {}

};

//-----------------------------------------------------------------------------

// Helper implementation of an IAppSystem for tier0

//-----------------------------------------------------------------------------

template< class IInterface >

class CTier0AppSystem : public CBaseAppSystem< IInterface >

{

public:

CTier0AppSystem( bool bIsPrimaryAppSystem = true )

{

m_bIsPrimaryAppSystem = bIsPrimaryAppSystem;

}

protected:

// NOTE: a single DLL may have multiple AppSystems it's trying to

// expose. If this is true, you must return true from only

// one of those AppSystems; not doing so will cause all static

// libraries connected to it to connect/disconnect multiple times

// NOTE: We don't do this as a virtual function to avoid

// having to up the version on all interfaces

bool IsPrimaryAppSystem() { return m_bIsPrimaryAppSystem; }

private:

bool m_bIsPrimaryAppSystem;

};

//-----------------------------------------------------------------------------

// This is the version of IAppSystem shipped 10/15/04

// NOTE: Never change this!!!

//-----------------------------------------------------------------------------

abstract_class IAppSystemV0

{

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;

};

#endif // IAPPSYSTEM_H

TF2-Source-Code/tf2_src/public/appframework/IAppSystem.h at master · sr2echa/TF2-Source-Code · GitHub

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