The Tor Browser / file comparison
comparison: xpcom/glue/nsCategoryCache.h
xpcom/glue/nsCategoryCache.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:342a94fdc400 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #ifndef nsCategoryCache_h_ | |
| 6 #define nsCategoryCache_h_ | |
| 7 | |
| 8 #include "mozilla/Attributes.h" | |
| 9 | |
| 10 #include "nsICategoryManager.h" | |
| 11 #include "nsIObserver.h" | |
| 12 #include "nsISimpleEnumerator.h" | |
| 13 #include "nsISupportsPrimitives.h" | |
| 14 | |
| 15 #include "nsServiceManagerUtils.h" | |
| 16 | |
| 17 #include "nsAutoPtr.h" | |
| 18 #include "nsCOMArray.h" | |
| 19 #include "nsInterfaceHashtable.h" | |
| 20 | |
| 21 #include "nsXPCOM.h" | |
| 22 | |
| 23 class NS_COM_GLUE nsCategoryObserver MOZ_FINAL : public nsIObserver | |
| 24 { | |
| 25 public: | |
| 26 nsCategoryObserver(const char* aCategory); | |
| 27 ~nsCategoryObserver(); | |
| 28 | |
| 29 void ListenerDied(); | |
| 30 nsInterfaceHashtable<nsCStringHashKey, nsISupports>& GetHash() | |
| 31 { | |
| 32 return mHash; | |
| 33 } | |
| 34 | |
| 35 NS_DECL_ISUPPORTS | |
| 36 NS_DECL_NSIOBSERVER | |
| 37 private: | |
| 38 void RemoveObservers(); | |
| 39 | |
| 40 nsInterfaceHashtable<nsCStringHashKey, nsISupports> mHash; | |
| 41 nsCString mCategory; | |
| 42 bool mObserversRemoved; | |
| 43 }; | |
| 44 | |
| 45 /** | |
| 46 * This is a helper class that caches services that are registered in a certain | |
| 47 * category. The intended usage is that a service stores a variable of type | |
| 48 * nsCategoryCache<nsIFoo> in a member variable, where nsIFoo is the interface | |
| 49 * that these services should implement. The constructor of this class should | |
| 50 * then get the name of the category. | |
| 51 */ | |
| 52 template<class T> | |
| 53 class nsCategoryCache MOZ_FINAL | |
| 54 { | |
| 55 public: | |
| 56 explicit nsCategoryCache(const char* aCategory) | |
| 57 : mCategoryName(aCategory) | |
| 58 { | |
| 59 } | |
| 60 ~nsCategoryCache() { | |
| 61 if (mObserver) | |
| 62 mObserver->ListenerDied(); | |
| 63 } | |
| 64 | |
| 65 void GetEntries(nsCOMArray<T>& result) { | |
| 66 // Lazy initialization, so that services in this category can't | |
| 67 // cause reentrant getService (bug 386376) | |
| 68 if (!mObserver) | |
| 69 mObserver = new nsCategoryObserver(mCategoryName.get()); | |
| 70 | |
| 71 mObserver->GetHash().EnumerateRead(EntriesToArray, &result); | |
| 72 } | |
| 73 | |
| 74 private: | |
| 75 // Not to be implemented | |
| 76 nsCategoryCache(const nsCategoryCache<T>&); | |
| 77 | |
| 78 static PLDHashOperator EntriesToArray(const nsACString& key, | |
| 79 nsISupports* entry, void* arg) | |
| 80 { | |
| 81 nsCOMArray<T>& entries = *static_cast<nsCOMArray<T>*>(arg); | |
| 82 | |
| 83 nsCOMPtr<T> service = do_QueryInterface(entry); | |
| 84 if (service) { | |
| 85 entries.AppendObject(service); | |
| 86 } | |
| 87 return PL_DHASH_NEXT; | |
| 88 } | |
| 89 | |
| 90 nsCString mCategoryName; | |
| 91 nsRefPtr<nsCategoryObserver> mObserver; | |
| 92 | |
| 93 }; | |
| 94 | |
| 95 #endif |
