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use nsIModule for factory, r=rhp bug 000
This commit is contained in:
bienvenu%netscape.com
parent
52141616b0
commit
2e13f082fe
@ -17,207 +17,220 @@
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*/
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#include "msgCore.h" // for pre-compiled headers...
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#include "nsIServiceManager.h"
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#include "nsIFactory.h"
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#include "nsISupports.h"
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#include "nsCOMPtr.h"
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#include "nsIModule.h"
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#include "nsIGenericFactory.h"
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#include "nsMsgDBCID.h"
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#include "pratom.h"
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// include files for components this factory creates...
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#include "nsMailDatabase.h"
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#include "nsNewsDatabase.h"
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#include "nsImapMailDatabase.h"
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#include "nsCOMPtr.h"
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static NS_DEFINE_CID(kComponentManagerCID, NS_COMPONENTMANAGER_CID);
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static NS_DEFINE_CID(kCMailDB, NS_MAILDB_CID);
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static NS_DEFINE_CID(kCNewsDB, NS_NEWSDB_CID);
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static NS_DEFINE_CID(kCImapDB, NS_IMAPDB_CID);
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////////////////////////////////////////////////////////////
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//
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////////////////////////////////////////////////////////////
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static PRInt32 g_InstanceCount = 0;
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static PRInt32 g_LockCount = 0;
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class nsMsgDBFactory : public nsIFactory
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{
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NS_GENERIC_FACTORY_CONSTRUCTOR(nsMailDatabase)
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NS_GENERIC_FACTORY_CONSTRUCTOR(nsNewsDatabase)
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NS_GENERIC_FACTORY_CONSTRUCTOR(nsImapMailDatabase)
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// Module implementation for the msg db library
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class nsMsgDBModule : public nsIModule
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{
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public:
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// nsISupports methods
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NS_DECL_ISUPPORTS
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nsMsgDBModule();
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virtual ~nsMsgDBModule();
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nsMsgDBFactory(const nsCID &aClass, const char* aClassName, const char* aProgID);
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NS_DECL_ISUPPORTS
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// nsIFactory methods
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NS_IMETHOD CreateInstance(nsISupports *aOuter, const nsIID &aIID, void **aResult);
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NS_IMETHOD LockFactory(PRBool aLock);
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NS_DECL_NSIMODULE
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protected:
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virtual ~nsMsgDBFactory();
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nsresult Initialize();
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nsCID mClassID;
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char* mClassName;
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char* mProgID;
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};
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void Shutdown();
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nsMsgDBFactory::nsMsgDBFactory(const nsCID &aClass, const char* aClassName, const char* aProgID)
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: mClassID(aClass), mClassName(nsCRT::strdup(aClassName)), mProgID(nsCRT::strdup(aProgID))
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{
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NS_INIT_REFCNT();
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}
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PRBool mInitialized;
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nsCOMPtr<nsIGenericFactory> mMailDBFactory;
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nsCOMPtr<nsIGenericFactory> mNewsDBFactory;
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nsCOMPtr<nsIGenericFactory> mImapDBFactory;
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};
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nsMsgDBFactory::~nsMsgDBFactory()
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nsMsgDBModule::nsMsgDBModule()
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: mInitialized(PR_FALSE)
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{
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nsMsgDatabase::CleanupCache();
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NS_ASSERTION(mRefCnt == 0, "non-zero refcnt at destruction");
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PL_strfree(mClassName);
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PL_strfree(mProgID);
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}
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nsresult nsMsgDBFactory::QueryInterface(const nsIID &aIID, void **aResult)
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{
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if (aResult == NULL)
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return NS_ERROR_NULL_POINTER;
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// Always NULL result, in case of failure
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*aResult = NULL;
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// we support two interfaces....nsISupports and nsFactory.....
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if (aIID.Equals(nsCOMTypeInfo<nsISupports>::GetIID()))
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*aResult = (void *)(nsISupports*)this;
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else if (aIID.Equals(nsIFactory::GetIID()))
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*aResult = (void *)(nsIFactory*)this;
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if (*aResult == NULL)
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return NS_NOINTERFACE;
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AddRef(); // Increase reference count for caller
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return NS_OK;
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}
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NS_IMPL_ADDREF(nsMsgDBFactory)
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NS_IMPL_RELEASE(nsMsgDBFactory)
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nsresult nsMsgDBFactory::CreateInstance(nsISupports *aOuter, const nsIID &aIID, void **aResult)
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{
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nsresult rv = NS_OK;
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if (aResult == NULL)
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return NS_ERROR_NULL_POINTER;
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*aResult = NULL;
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nsISupports *inst = nsnull;
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// ClassID check happens here
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// Whenever you add a new class that supports an interface, plug it in here!!!
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// do they want an nsMailDatabase ?
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if (mClassID.Equals(kCMailDB))
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{
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inst = NS_STATIC_CAST(nsIMsgDatabase*, new nsMailDatabase());
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}
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// do they want an nsNewsDatabase ?
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else if (mClassID.Equals(kCNewsDB))
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{
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inst = NS_STATIC_CAST(nsINewsDatabase*, new nsNewsDatabase());
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}
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// do they want an nsImapDatabase?
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else if (mClassID.Equals(kCImapDB))
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{
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inst = new nsImapMailDatabase();
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}
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if (inst == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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rv = inst->QueryInterface(aIID, aResult);
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if (NS_FAILED(rv))
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delete inst;
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return rv;
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}
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nsresult nsMsgDBFactory::LockFactory(PRBool aLock)
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{
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if (aLock) {
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PR_AtomicIncrement(&g_LockCount);
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} else {
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PR_AtomicDecrement(&g_LockCount);
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}
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return NS_OK;
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}
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// return the proper factory to the caller.
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extern "C" NS_EXPORT nsresult NSGetFactory(nsISupports* aServMgr,
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const nsCID &aClass,
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const char *aClassName,
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const char *aProgID,
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nsIFactory **aFactory)
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{
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if (nsnull == aFactory)
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return NS_ERROR_NULL_POINTER;
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// If we decide to implement multiple factories in the msg.dll, then we need to check the class
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// type here and create the appropriate factory instead of always creating a nsMsgFactory...
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*aFactory = new nsMsgDBFactory(aClass, aClassName, aProgID);
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if (aFactory)
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return (*aFactory)->QueryInterface(nsIFactory::GetIID(), (void**)aFactory); // they want a Factory Interface so give it to them
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else
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return NS_ERROR_OUT_OF_MEMORY;
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NS_INIT_ISUPPORTS();
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}
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extern "C" NS_EXPORT PRBool NSCanUnload(nsISupports* aServMgr)
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nsMsgDBModule::~nsMsgDBModule()
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{
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PRBool ret = PRBool(g_InstanceCount == 0 && g_LockCount == 0);
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if (ret)
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nsMsgDatabase::CleanupCache();
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return ret;
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Shutdown();
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}
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extern "C" NS_EXPORT nsresult
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NSRegisterSelf(nsISupports* aServMgr, const char* path)
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NS_IMPL_ISUPPORTS(nsMsgDBModule, NS_GET_IID(nsIModule))
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// Perform our one-time intialization for this module
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nsresult nsMsgDBModule::Initialize()
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{
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nsresult rv = NS_OK;
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nsresult finalResult = NS_OK;
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if (mInitialized)
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return NS_OK;
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NS_WITH_SERVICE1(nsIComponentManager, compMgr, aServMgr, kComponentManagerCID, &rv);
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if (NS_FAILED(rv)) return rv;
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rv = compMgr->RegisterComponent(kCMailDB, "Local Mail DB", "component://netscape/messenger/maildb",
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path, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv))finalResult = rv;
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rv = compMgr->RegisterComponent(kCNewsDB, "News DB", "component://netscape/messenger/newsdb",
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path, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv)) finalResult = rv;
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rv = compMgr->RegisterComponent(kCImapDB, "IMAP DB", "component://netscape/messenger/imapdb",
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path, PR_TRUE, PR_TRUE);
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if (NS_FAILED(rv)) finalResult = rv;
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return finalResult;
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mInitialized = PR_TRUE;
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return NS_OK;
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}
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extern "C" NS_EXPORT nsresult
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NSUnregisterSelf(nsISupports* aServMgr, const char* path)
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// Shutdown this module, releasing all of the module resources
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void nsMsgDBModule::Shutdown()
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{
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nsresult rv = NS_OK;
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nsresult finalResult = NS_OK;
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NS_WITH_SERVICE1(nsIComponentManager, compMgr, aServMgr, kComponentManagerCID, &rv);
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if (NS_FAILED(rv)) return rv;
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rv = compMgr->UnregisterComponent(kCMailDB, path);
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if (NS_FAILED(rv)) finalResult = rv;
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rv = compMgr->UnregisterComponent(kCImapDB, path);
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if (NS_FAILED(rv)) finalResult = rv;
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rv = compMgr->UnregisterComponent(kCNewsDB, path);
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if (NS_FAILED(rv)) finalResult = rv;
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return finalResult;
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// Release the factory objects
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mMailDBFactory = null_nsCOMPtr();
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mNewsDBFactory = null_nsCOMPtr();
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mImapDBFactory = null_nsCOMPtr();
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}
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// Create a factory object for creating instances of aClass.
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NS_IMETHODIMP nsMsgDBModule::GetClassObject(nsIComponentManager *aCompMgr,
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const nsCID& aClass,
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const nsIID& aIID,
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void** r_classObj)
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{
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nsresult rv;
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// Defensive programming: Initialize *r_classObj in case of error below
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if (!r_classObj)
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return NS_ERROR_INVALID_POINTER;
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*r_classObj = NULL;
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// Do one-time-only initialization if necessary
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if (!mInitialized)
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{
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rv = Initialize();
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if (NS_FAILED(rv)) // Initialization failed! yikes!
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return rv;
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}
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// Choose the appropriate factory, based on the desired instance
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// class type (aClass).
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nsCOMPtr<nsIGenericFactory> fact;
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if (aClass.Equals(kCMailDB))
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{
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if (!mMailDBFactory)
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rv = NS_NewGenericFactory(getter_AddRefs(mMailDBFactory), &nsMailDatabaseConstructor);
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fact = mMailDBFactory;
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}
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else if (aClass.Equals(kCNewsDB))
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{
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if (!mNewsDBFactory)
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rv = NS_NewGenericFactory(getter_AddRefs(mNewsDBFactory), &nsNewsDatabaseConstructor);
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fact = mNewsDBFactory;
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}
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else if (aClass.Equals(kCImapDB))
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{
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if (!mImapDBFactory)
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rv = NS_NewGenericFactory(getter_AddRefs(mImapDBFactory), &nsImapMailDatabaseConstructor);
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fact = mImapDBFactory;
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}
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if (fact)
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rv = fact->QueryInterface(aIID, r_classObj);
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return rv;
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}
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struct Components {
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const char* mDescription;
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const nsID* mCID;
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const char* mProgID;
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};
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// The list of components we register
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static Components gComponents[] = {
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{ "Mail DB", &kCMailDB,
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nsnull },
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{ "News DB", &kCNewsDB,
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nsnull },
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{ "Imap DB", &kCImapDB,
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nsnull },
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};
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#define NUM_COMPONENTS (sizeof(gComponents) / sizeof(gComponents[0]))
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NS_IMETHODIMP nsMsgDBModule::RegisterSelf(nsIComponentManager *aCompMgr,
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nsIFileSpec* aPath,
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const char* registryLocation,
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const char* componentType)
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{
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nsresult rv = NS_OK;
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Components* cp = gComponents;
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Components* end = cp + NUM_COMPONENTS;
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while (cp < end)
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{
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rv = aCompMgr->RegisterComponentSpec(*cp->mCID, cp->mDescription,
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cp->mProgID, aPath, PR_TRUE,
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PR_TRUE);
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if (NS_FAILED(rv))
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break;
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cp++;
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}
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return rv;
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}
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NS_IMETHODIMP nsMsgDBModule::UnregisterSelf(nsIComponentManager* aCompMgr,
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nsIFileSpec* aPath,
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const char* registryLocation)
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{
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Components* cp = gComponents;
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Components* end = cp + NUM_COMPONENTS;
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while (cp < end)
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{
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aCompMgr->UnregisterComponentSpec(*cp->mCID, aPath);
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cp++;
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}
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return NS_OK;
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}
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NS_IMETHODIMP nsMsgDBModule::CanUnload(nsIComponentManager *aCompMgr, PRBool *okToUnload)
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{
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if (!okToUnload)
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return NS_ERROR_INVALID_POINTER;
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*okToUnload = PR_FALSE;
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return NS_ERROR_FAILURE;
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}
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//----------------------------------------------------------------------
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static nsMsgDBModule *gModule = NULL;
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extern "C" NS_EXPORT nsresult NSGetModule(nsIComponentManager *servMgr,
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nsIFileSpec* location,
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nsIModule** return_cobj)
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{
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nsresult rv = NS_OK;
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NS_ASSERTION(return_cobj, "Null argument");
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NS_ASSERTION(gModule == NULL, "nsMsgDBModule: Module already created.");
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// Create an initialize the imap module instance
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nsMsgDBModule *module = new nsMsgDBModule();
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if (!module)
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return NS_ERROR_OUT_OF_MEMORY;
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// Increase refcnt and store away nsIModule interface to m in return_cobj
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rv = module->QueryInterface(nsIModule::GetIID(), (void**)return_cobj);
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if (NS_FAILED(rv))
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{
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delete module;
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module = nsnull;
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}
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gModule = module; // WARNING: Weak Reference
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return rv;
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}
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