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gecko-dev/xpfe/components/public/nsIAppShellComponentImpl.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef __nsIAppShellComponentImpl_h
#define __nsIAppShellComponentImpl_h
#include "nsIAppShellComponent.h"
#include "nsIAppShellService.h"
#include "nsAppShellCIDs.h"
#include "nsIComponentManager.h"
#include "nsIServiceManager.h"
#include "nsICmdLineService.h"
#include "nsISupports.h"
#include "nsIFactory.h"
#include "nsIModule.h"
#include "nsIGenericFactory.h"
#include "nsIRegistry.h"
#include "pratom.h"
#include "nsCOMPtr.h"
#include "prprf.h"
/*------------------------------------------------------------------------------
| This file contains macros to assist in the implementation of application |
| shell components. The macros of interest (that you would typically use |
| in the implementation of your component) are: |
| |
| NS_IMPL_IAPPSHELLCOMPONENT( className, interfaceName, contractId ): |
| |
| This macro will generate all the boilderplate app shell component |
| implementation details. |
| "className" is the name of your implementation |
| class. |
| "interfaceName" is the name of the interface that the class |
| implements (sorry, currently only one is supported). |
| "contractId" is the contractId corresponding to the interface your |
| class implements. |
------------------------------------------------------------------------------*/
#if defined( NS_DEBUG ) && !defined( XP_MAC )
#define DEBUG_PRINTF PR_fprintf
#else
#define DEBUG_PRINTF (void)
#endif
#define NS_IMPL_NSGETMODULE1(_class) \
static _class *g##_class; \
extern "C" NS_EXPORT nsresult \
NSGetModule(nsIComponentManager *servMgr, \
nsIFile* aPath, \
nsIModule** aResult) \
{ \
nsresult rv = NS_OK; \
\
if (!aResult) return NS_ERROR_NULL_POINTER; \
if (!g##_class) { \
g##_class = new _class; \
if (!g##_class) return NS_ERROR_OUT_OF_MEMORY; \
} \
\
NS_ADDREF(g##_class); \
if (g##_class) \
rv = g##_class->QueryInterface(NS_GET_IID(nsIModule), \
(void **)aResult); \
NS_RELEASE(g##_class); \
return rv; \
}
// Declare nsInstanceCounter class.
class nsInstanceCounter {
public:
// ctor increments (shared library) global instance counter.
nsInstanceCounter() {
PR_AtomicIncrement( &mInstanceCount );
}
// dtor decrements it.
~nsInstanceCounter() {
PR_AtomicDecrement( &mInstanceCount );
}
// Tests whether shared library can be unloaded.
static PRBool CanUnload() {
return mInstanceCount == 0 && mLockCount == 0;
}
// Lock/unlock (a factory).
static nsresult LockFactory( PRBool aLock ) {
if (aLock)
PR_AtomicIncrement( &mLockCount );
else
PR_AtomicDecrement( &mLockCount );
return NS_OK;
}
private:
static PRInt32 mInstanceCount, mLockCount;
}; // nsInstanceCounter
#define NS_DEFINE_MODULE_INSTANCE_COUNTER() \
PRInt32 nsInstanceCounter::mInstanceCount = 0; \
PRInt32 nsInstanceCounter::mLockCount = 0; \
\
// Declare component-global class.
class nsAppShellComponentImpl {
public:
// Override this and return PR_FALSE if your component
// should not be registered with the Service Manager
// when Initialize-d.
virtual PRBool Is_Service() { return PR_TRUE; }
// Override this to perform initialization for your component.
NS_IMETHOD DoInitialization() { return NS_OK; }
static nsIAppShellService *GetAppShell() {
if ( !mAppShell ) {
nsCID cid = NS_APPSHELL_SERVICE_CID;
nsServiceManager::GetService( cid,
NS_GET_IID(nsIAppShellService),
(nsISupports**)&mAppShell );
}
return mAppShell;
}
static nsIAppShellService *mAppShell;
static nsICmdLineService *mCmdLine;
#ifdef NS_DEBUG
nsAppShellComponentImpl();
virtual ~nsAppShellComponentImpl();
#endif
}; // nsAppShellComponent
#define NS_DEFINE_COMPONENT_GLOBALS() \
nsIAppShellService *nsAppShellComponentImpl::mAppShell = 0; \
nsICmdLineService *nsAppShellComponentImpl::mCmdLine = 0;
// Macros to define ctor/dtor for implementation class.
// These differ in debug vs. non-debug situations.
#ifdef NS_DEBUG
#define NS_IMPL_IAPPSHELLCOMPONENTIMPL_CTORDTOR(className) \
nsAppShellComponentImpl::nsAppShellComponentImpl() { \
DEBUG_PRINTF( PR_STDOUT, #className " component created\n" ); \
} \
nsAppShellComponentImpl::~nsAppShellComponentImpl() { \
DEBUG_PRINTF( PR_STDOUT, #className " component destroyed\n" ); \
}
#else
#define NS_IMPL_IAPPSHELLCOMPONENTIMPL_CTORDTOR(className)
#endif
#define NS_IMPL_IAPPSHELLCOMPONENT( className, interfaceName, contractId, autoInit ) \
/* Define instance counter implementation stuff. */\
NS_DEFINE_MODULE_INSTANCE_COUNTER() \
/* Define component globals. */\
NS_DEFINE_COMPONENT_GLOBALS() \
/* Component's implementation of Initialize. */\
NS_IMETHODIMP \
className::Initialize( nsIAppShellService *anAppShell, \
nsICmdLineService *aCmdLineService ) { \
nsresult rv = NS_OK; \
mAppShell = anAppShell; \
mCmdLine = aCmdLineService; \
if ( Is_Service() ) { \
rv = nsServiceManager::RegisterService( contractId, this ); \
} \
if ( NS_SUCCEEDED( rv ) ) { \
rv = DoInitialization(); \
} \
return rv; \
} \
/* Component's implementation of Shutdown. */\
NS_IMETHODIMP \
className::Shutdown() { \
nsresult rv = NS_OK; \
if ( Is_Service() ) { \
rv = nsServiceManager::UnregisterService( contractId ); \
} \
return rv; \
} \
/* nsISupports Implementation for the class */\
NS_IMPL_ADDREF( className ); \
NS_IMPL_RELEASE( className ); \
/* QueryInterface implementation for this class. */\
NS_IMETHODIMP \
className::QueryInterface( REFNSIID anIID, void **anInstancePtr ) { \
nsresult rv = NS_OK; \
/* Check for place to return result. */\
if ( !anInstancePtr ) { \
rv = NS_ERROR_NULL_POINTER; \
} else { \
/* Initialize result. */\
*anInstancePtr = 0; \
/* Check for IIDs we support and cast this appropriately. */\
if ( 0 ) { \
} else if ( anIID.Equals( NS_GET_IID(interfaceName) ) ) { \
*anInstancePtr = (void*) this; \
NS_ADDREF_THIS(); \
} else if ( anIID.Equals( NS_GET_IID(nsIAppShellComponent) ) ) { \
*anInstancePtr = (void*) ( (nsIAppShellComponent*)this ); \
NS_ADDREF_THIS(); \
} else if ( anIID.Equals( NS_GET_IID(nsISupports) ) ) { \
*anInstancePtr = (void*) ( (nsISupports*)this ); \
NS_ADDREF_THIS(); \
} else { \
/* Not an interface we support. */\
rv = NS_NOINTERFACE; \
} \
} \
return rv; \
} \
/* Factory class */\
struct className##Factory : public nsIFactory { \
/* ctor/dtor */\
className##Factory() { \
NS_INIT_REFCNT(); \
} \
virtual ~className##Factory() { \
} \
/* This class implements the nsISupports interface functions. */\
NS_DECL_ISUPPORTS \
/* nsIFactory methods */\
NS_IMETHOD CreateInstance( nsISupports *aOuter, \
const nsIID &aIID, \
void **aResult ); \
NS_IMETHOD LockFactory( PRBool aLock ); \
private: \
nsInstanceCounter instanceCounter; \
}; \
/* nsISupports interface implementation for the factory. */\
NS_IMPL_ADDREF( className##Factory ) \
NS_IMPL_RELEASE( className##Factory ) \
NS_IMETHODIMP \
className##Factory::QueryInterface( const nsIID &anIID, void **aResult ) { \
nsresult rv = NS_OK; \
if ( aResult ) { \
*aResult = 0; \
if ( 0 ) { \
} else if ( anIID.Equals( NS_GET_IID(nsIFactory) ) ) { \
*aResult = (void*) (nsIFactory*)this; \
NS_ADDREF_THIS(); \
} else if ( anIID.Equals( NS_GET_IID(nsISupports) ) ) { \
*aResult = (void*) (nsISupports*)this; \
NS_ADDREF_THIS(); \
} else { \
rv = NS_ERROR_NO_INTERFACE; \
} \
} else { \
rv = NS_ERROR_NULL_POINTER; \
} \
return rv; \
} \
/* Factory's CreateInstance implementation */\
NS_IMETHODIMP \
className##Factory::CreateInstance( nsISupports *anOuter, \
const nsIID &anIID, \
void* *aResult ) { \
nsresult rv = NS_OK; \
if ( aResult ) { \
/* Allocate new find component object. */\
className *component = new className(); \
if ( component ) { \
/* Allocated OK, do query interface to get proper */\
/* pointer and increment refcount. */\
rv = component->QueryInterface( anIID, aResult ); \
if ( NS_FAILED( rv ) ) { \
/* refcount still at zero, delete it here. */\
delete component; \
} \
} else { \
rv = NS_ERROR_OUT_OF_MEMORY; \
} \
} else { \
rv = NS_ERROR_NULL_POINTER; \
} \
return rv; \
} \
/* Factory's LockFactory implementation */\
NS_IMETHODIMP \
className##Factory::LockFactory(PRBool aLock) { \
return nsInstanceCounter::LockFactory( aLock ); \
} \
class className##Module : public nsIModule { \
public: \
className##Module() { \
NS_INIT_REFCNT(); \
} \
virtual ~className##Module() { \
} \
NS_DECL_ISUPPORTS \
NS_DECL_NSIMODULE \
}; \
NS_IMPL_ISUPPORTS1(className##Module, nsIModule) \
/* NSRegisterSelf implementation */\
NS_IMETHODIMP \
className##Module::RegisterSelf(nsIComponentManager *compMgr, \
nsIFile* aPath, \
const char *registryLocation, \
const char *componentType) \
{ \
nsresult rv = NS_OK; \
/* WARNING: Dont remember service manager. */ \
/* Get the component manager service. */ \
\
if (NS_FAILED(rv)) return rv; \
/* Register our component. */ \
rv = compMgr->RegisterComponentSpec( className::GetCID(), #className, \
contractId, aPath, PR_TRUE, PR_TRUE ); \
if ( NS_SUCCEEDED( rv ) ) { \
DEBUG_PRINTF( PR_STDOUT, #className " registration successful\n" ); \
if ( autoInit ) { \
/* Add to appshell component list. */ \
nsIRegistry *registry; \
rv = nsServiceManager::GetService( NS_REGISTRY_CONTRACTID, \
NS_GET_IID(nsIRegistry), \
(nsISupports**)&registry ); \
if ( NS_SUCCEEDED( rv ) ) { \
registry->OpenWellKnownRegistry(nsIRegistry::ApplicationComponentRegistry); \
char buffer[256]; \
char *cidString = className::GetCID().ToString(); \
PR_snprintf( buffer, sizeof buffer, "%s/%s", \
NS_IAPPSHELLCOMPONENT_KEY, \
cidString ? cidString : "unknown" ); \
delete [] cidString; \
nsRegistryKey key; \
rv = registry->AddSubtree( nsIRegistry::Common, buffer, &key ); \
if ( NS_SUCCEEDED( rv ) ) { \
DEBUG_PRINTF( PR_STDOUT, #className " added to appshell component list\n" ); \
} else { \
DEBUG_PRINTF( PR_STDOUT, #className " not added to appshell component list, rv=0x%X\n", (int)rv ); \
} \
} else { \
DEBUG_PRINTF( PR_STDOUT, #className " not added to appshell component list, rv=0x%X\n", (int)rv ); \
} \
} \
} else { \
DEBUG_PRINTF( PR_STDOUT, #className " registration failed, RegisterComponent rv=0x%X\n", (int)rv ); \
} \
\
return rv; \
} \
/* UnregisterSelf implementation */ \
NS_IMETHODIMP \
className##Module::UnregisterSelf( nsIComponentManager *compMgr, \
nsIFile* aPath, \
const char *registryLocation) { \
nsresult rv = NS_OK; \
if (NS_FAILED(rv)) \
{ \
DEBUG_PRINTF( PR_STDOUT, #className " registration failed, GetService rv=0x%X\n", (int)rv ); \
return rv; \
} \
\
/* Unregister our component. */ \
rv = compMgr->UnregisterComponentSpec( className::GetCID(), aPath); \
if ( NS_SUCCEEDED( rv ) ) { \
DEBUG_PRINTF( PR_STDOUT, #className " unregistration successful\n" ); \
} else { \
DEBUG_PRINTF( PR_STDOUT, #className " unregistration failed, UnregisterComponent rv=0x%X\n", (int)rv ); \
} \
\
return rv; \
} \
/* GetFactory implementation */\
NS_IMETHODIMP \
className##Module::GetClassObject( nsIComponentManager *compMgr, \
const nsCID &aClass, \
const nsIID &aIID, \
void **aFactory ) { \
nsresult rv = NS_OK; \
if ( NS_SUCCEEDED( rv ) ) { \
if ( aFactory ) { \
className##Factory *factory = new className##Factory(); \
if ( factory ) { \
NS_ADDREF(factory); \
rv = factory->QueryInterface( aIID, (void**)aFactory ); \
NS_RELEASE(factory); \
} else { \
rv = NS_ERROR_OUT_OF_MEMORY; \
} \
} else { \
rv = NS_ERROR_NULL_POINTER; \
} \
} \
return rv; \
} \
NS_IMETHODIMP \
className##Module::CanUnload( nsIComponentManager*, PRBool* canUnload) { \
if (!canUnload) return NS_ERROR_NULL_POINTER; \
*canUnload = nsInstanceCounter::CanUnload(); \
return NS_OK; \
} \
NS_IMPL_IAPPSHELLCOMPONENTIMPL_CTORDTOR( className ) \
NS_IMPL_NSGETMODULE1(className##Module)
#endif
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