gecko-dev/xpcom/components/nsComponentManager.h

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#ifndef nsComponentManager_h__
#define nsComponentManager_h__

#include "nsXPCOM.h"

#include "nsIComponentLoader.h"
#include "nsNativeComponentLoader.h"
#include "nsIComponentManager.h"
#include "nsIComponentRegistrar.h"
#include "nsIComponentManagerObsolete.h"
#include "nsIComponentLoaderManager.h"
#include "nsICategoryManager.h"
#include "nsIServiceManager.h"
#include "nsIFactory.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "pldhash.h"
#include "prtime.h"
#include "prmon.h"
#include "nsCOMPtr.h"
#include "nsWeakReference.h"
#include "nsXPIDLString.h"
#include "nsIFile.h"
#include "plarena.h"

class nsFactoryEntry;
class nsDll;
class nsIServiceManager;


// Predefined loader types. Do not change the numbers.
// NATIVE should be 0 as it is being used as the first array index.
#define NS_COMPONENT_TYPE_NATIVE 0
#define NS_COMPONENT_TYPE_FACTORY_ONLY -1
// this define means that the factory entry only has a ContractID 
// to service mapping and has no cid mapping.
#define NS_COMPONENT_TYPE_SERVICE_ONLY -2


#ifdef DEBUG
#define XPCOM_CHECK_PENDING_CIDS
#endif
////////////////////////////////////////////////////////////////////////////////

// Array of Loaders and their type strings
struct nsLoaderdata {
    nsIComponentLoader *loader;
    const char *type;
};

class nsComponentManagerImpl
    : public nsIComponentManager,
      public nsIServiceManager,
      public nsIComponentRegistrar,
      public nsSupportsWeakReference,
      public nsIInterfaceRequestor,
      public nsIComponentLoaderManager,
      public nsIServiceManagerObsolete,
      public nsIComponentManagerObsolete
{
public:
    NS_DECL_ISUPPORTS
    NS_DECL_NSIINTERFACEREQUESTOR
    // Since the nsIComponentManagerObsolete and nsIComponentManager share some of the 
    // same interface function names, we have to manually define the functions here.
    // The only function that is in nsIComponentManagerObsolete and is in nsIComponentManager
    // is GetClassObjectContractID.  
    //
    // nsIComponentManager function not in nsIComponentManagerObsolete:
    NS_IMETHOD GetClassObjectByContractID(const char *aContractID,
                                          const nsIID &aIID,
                                          void **_retval);


    NS_DECL_NSICOMPONENTMANAGEROBSOLETE

    // Since the nsIComponentManagerObsolete and nsIComponentRegistrar share some of the
    // same interface function names, we have to manually define the functions here.
    // the only fuction that is shared is UnregisterFactory
    NS_IMETHOD AutoRegister(nsIFile *aSpec); 
    NS_IMETHOD AutoUnregister(nsIFile *aSpec); 
    NS_IMETHOD RegisterFactory(const nsCID & aClass, const char *aClassName, const char *aContractID, nsIFactory *aFactory); 
    //  NS_IMETHOD UnregisterFactory(const nsCID & aClass, nsIFactory *aFactory); 
    NS_IMETHOD RegisterFactoryLocation(const nsCID & aClass, const char *aClassName, const char *aContractID, nsIFile *aFile, const char *loaderStr, const char *aType); 
    NS_IMETHOD UnregisterFactoryLocation(const nsCID & aClass, nsIFile *aFile); 
    NS_IMETHOD IsCIDRegistered(const nsCID & aClass, PRBool *_retval); 
    NS_IMETHOD IsContractIDRegistered(const char *aClass, PRBool *_retval); 
    NS_IMETHOD EnumerateCIDs(nsISimpleEnumerator **_retval); 
    NS_IMETHOD EnumerateContractIDs(nsISimpleEnumerator **_retval); 
    NS_IMETHOD CIDToContractID(const nsCID & aClass, char **_retval); 
    NS_IMETHOD ContractIDToCID(const char *aContractID, nsCID * *_retval); 
    
    NS_DECL_NSISERVICEMANAGER
    NS_DECL_NSISERVICEMANAGEROBSOLETE
    NS_DECL_NSICOMPONENTLOADERMANAGER

    // nsComponentManagerImpl methods:
    nsComponentManagerImpl();
    virtual ~nsComponentManagerImpl();

    static nsComponentManagerImpl* gComponentManager;
    nsresult Init(void);

    nsresult WritePersistentRegistry();
    nsresult ReadPersistentRegistry();
private:
    nsresult WriteCategoryManagerToRegistry(PRFileDesc* fd);
public:

    nsresult Shutdown(void);

    nsresult FreeServices();

    friend class nsFactoryEntry;
    friend class nsServiceManager;

    friend nsresult
    NS_GetService(const char *aContractID, const nsIID& aIID, PRBool aDontCreate, nsISupports** result);

protected:
    nsresult RegisterComponentCommon(const nsCID &aClass,
                                     const char *aClassName,
                                     const char *aContractID,
                                     const char *aRegistryName,
                                     PRBool aReplace, PRBool aPersist,
                                     const char *aType);
    nsresult GetLoaderForType(int aType, 
                              nsIComponentLoader **aLoader);
    nsresult FindFactory(const char *contractID, nsIFactory **aFactory) ;
    nsresult LoadFactory(nsFactoryEntry *aEntry, nsIFactory **aFactory);

    nsFactoryEntry *GetFactoryEntry(const char *aContractID);
    nsFactoryEntry *GetFactoryEntry(const nsCID &aClass);
    nsFactoryEntry *GetFactoryEntry(const nsCID &aClass, nsIDKey &cidKey);

    nsresult SyncComponentsInDir(PRInt32 when, nsIFile *dirSpec);
    nsresult SelfRegisterDll(nsDll *dll);
    nsresult SelfUnregisterDll(nsDll *dll);
    nsresult HashContractID(const char *acontractID, nsFactoryEntry *fe_ptr);
    nsresult HashContractID(const char *acontractID, const nsCID &aClass, nsFactoryEntry **fe_ptr = NULL);
    nsresult HashContractID(const char *acontractID, const nsCID &aClass, nsIDKey &cidKey, nsFactoryEntry **fe_ptr = NULL);

    void DeleteContractIDEntriesByCID(const nsCID* aClass, const char*registryName);
    void DeleteContractIDEntriesByCID(const nsCID* aClass, nsIFactory* factory);

    nsresult UnloadLibraries(nsIServiceManager *servmgr, PRInt32 when);
    
    // Convert a loader type string into an index into the loader data
    // array. Empty loader types are converted to NATIVE. Returns -1 if
    // loader type cannot be determined.
    int GetLoaderType(const char *typeStr);

    // Add a loader type if not already known. Return the typeIndex
    // if the loader type is either added or already there; -1 if
    // there was an error
    int AddLoaderType(const char *typeStr);

public:
    int GetLoaderCount() { return mNLoaderData + 1; }

    // registers only the files in spec's location by loaders other than the
    // native loader.  This is an optimization method only.
    nsresult AutoRegisterNonNativeComponents(nsIFile* spec);


private:
    nsresult AutoRegisterImpl(PRInt32 when, nsIFile *inDirSpec, PRBool fileIsCompDir=PR_TRUE);

protected:
    PLDHashTable        mFactories;
    PLDHashTable        mContractIDs;
    PRMonitor*          mMon;

    nsNativeComponentLoader *mNativeComponentLoader;
#ifdef ENABLE_STATIC_COMPONENT_LOADER
    nsIComponentLoader  *mStaticComponentLoader;
#endif
    nsCOMPtr<nsIFile>   mComponentsDir;
    PRInt32             mComponentsOffset;

    nsCOMPtr<nsIFile>   mGREComponentsDir;
    PRInt32             mGREComponentsOffset;

    nsCOMPtr<nsIFile>   mRegistryFile;

    // Shutdown
    #define NS_SHUTDOWN_NEVERHAPPENED 0
    #define NS_SHUTDOWN_INPROGRESS 1
    #define NS_SHUTDOWN_COMPLETE 2
    PRUint32 mShuttingDown;

    nsLoaderdata *mLoaderData;
    int mNLoaderData;
    int mMaxNLoaderData;

    PRBool              mRegistryDirty;
    nsHashtable         mAutoRegEntries;
    nsCOMPtr<nsICategoryManager>  mCategoryManager;

    PLArenaPool   mArena;

#ifdef XPCOM_CHECK_PENDING_CIDS
    nsresult AddPendingCID(const nsCID &aClass);
    void RemovePendingCID(const nsCID &aClass);

    nsVoidArray         mPendingCIDs;
#endif

};


#define NS_MAX_FILENAME_LEN	1024

#define NS_ERROR_IS_DIR NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_XPCOM, 24)

#if defined(XP_UNIX) && !defined(XP_MACOSX)
/* The default registry on the unix system is $HOME/.mozilla/registry per
 * vr_findGlobalRegName(). vr_findRegFile() will create the registry file
 * if it doesn't exist. But it wont create directories.
 *
 * Hence we need to create the directory if it doesn't exist already.
 *
 * Why create it here as opposed to the app ?
 * ------------------------------------------
 * The app cannot create the directory in main() as most of the registry
 * and initialization happens due to use of static variables.
 * And we dont want to be dependent on the order in which
 * these static stuff happen.
 *
 * Permission for the $HOME/.mozilla will be Read,Write,Execute
 * for user only. Nothing to group and others.
 */
#define NS_MOZILLA_DIR_NAME		".mozilla"
#define NS_MOZILLA_DIR_PERMISSION	00700
#endif /* XP_UNIX */

#ifdef XP_BEOS
#define NS_MOZILLA_DIR_NAME		"Mozilla"
#define NS_MOZILLA_DIR_PERMISSION	00700
#endif /* XP_BEOS */

////////////////////////////////////////////////////////////////////////////////
/**
 * Class: nsFactoryEntry()
 *
 * There are two types of FactoryEntries.
 *
 * 1. {CID, dll} mapping.
 *		Factory is a consequence of the dll. These can be either session
 *		specific or persistent based on whether we write this
 *		to the registry or not.
 *
 * 2. {CID, factory} mapping
 *		These are strictly session specific and in memory only.
 */

class nsFactoryEntry {
public:
    nsFactoryEntry(const nsCID &aClass, const char *location, int aType);
    nsFactoryEntry(const nsCID &aClass, nsIFactory *aFactory);
    ~nsFactoryEntry();

    nsresult ReInit(const nsCID &aClass, const char *location, int aType);
    nsresult ReInit(const nsCID &aClass, nsIFactory *aFactory);

    nsresult GetFactory(nsIFactory **aFactory, 
                        nsComponentManagerImpl * mgr) {
        if (factory) {
            *aFactory = factory.get();
            NS_ADDREF(*aFactory);
            return NS_OK;
        }

        if (typeIndex < 0)
            return NS_ERROR_FAILURE;

        nsresult rv;
        nsCOMPtr<nsIComponentLoader> loader;
        rv = mgr->GetLoaderForType(typeIndex, getter_AddRefs(loader));
        if(NS_FAILED(rv))
            return rv;

        rv = loader->GetFactory(cid, location, mgr->mLoaderData[typeIndex].type, aFactory);
        if (NS_SUCCEEDED(rv))
            factory = do_QueryInterface(*aFactory);
        return rv;
    }

    nsCID cid;
    char *location;
    nsCOMPtr<nsIFactory> factory;
    // This is an index into the mLoaderData array that holds the type string and the loader 
    int typeIndex;
    nsCOMPtr<nsISupports> mServiceObject;
};

////////////////////////////////////////////////////////////////////////////////

struct nsFactoryTableEntry : public PLDHashEntryHdr {
    nsFactoryEntry *mFactoryEntry;    
};

struct nsContractIDTableEntry : public PLDHashEntryHdr {
    char           *mContractID;
    nsFactoryEntry *mFactoryEntry;    
};


class AutoRegEntry
{
public:
    AutoRegEntry(const char* name, PRInt64* modDate);
    virtual ~AutoRegEntry();

    char*   GetName() {return mName;}
    PRInt64 GetDate() {return mModDate;}
    void    SetDate(PRInt64 *date) { mModDate = *date;}
    PRBool  Modified(PRInt64 *date);

    // this is the optional field line in the compreg.dat.
    // it must not contain any comma's and it must be null terminated.
    char*   GetOptionalData() {return mData;};
    void    SetOptionalData(const char* data);

private:
    char*   mName;
    char*   mData;
    PRInt64 mModDate;
};
#endif // nsComponentManager_h__