зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
3.3 KiB
C++
118 строки
3.3 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsCategoryCache_h_
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#define nsCategoryCache_h_
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#include "mozilla/Attributes.h"
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#include "nsICategoryManager.h"
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#include "nsIObserver.h"
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#include "nsISimpleEnumerator.h"
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#include "nsISupportsPrimitives.h"
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#include "nsServiceManagerUtils.h"
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#include "nsAutoPtr.h"
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#include "nsCOMArray.h"
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#include "nsDataHashtable.h"
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#include "nsXPCOM.h"
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class NS_NO_VTABLE nsCategoryListener {
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protected:
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// no virtual destructor (people shouldn't delete through an
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// nsCategoryListener pointer)
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~nsCategoryListener() {}
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public:
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virtual void EntryAdded(const nsCString& aValue) = 0;
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virtual void EntryRemoved(const nsCString& aValue) = 0;
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virtual void CategoryCleared() = 0;
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};
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class NS_COM_GLUE nsCategoryObserver MOZ_FINAL : public nsIObserver {
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public:
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nsCategoryObserver(const char* aCategory,
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nsCategoryListener* aCategoryListener);
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~nsCategoryObserver();
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void ListenerDied();
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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private:
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NS_HIDDEN_(void) RemoveObservers();
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nsDataHashtable<nsCStringHashKey, nsCString> mHash;
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nsCategoryListener* mListener;
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nsCString mCategory;
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bool mObserversRemoved;
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};
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/**
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* This is a helper class that caches services that are registered in a certain
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* category. The intended usage is that a service stores a variable of type
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* nsCategoryCache<nsIFoo> in a member variable, where nsIFoo is the interface
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* that these services should implement. The constructor of this class should
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* then get the name of the category.
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*/
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template<class T>
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class nsCategoryCache MOZ_FINAL : protected nsCategoryListener {
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public:
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explicit nsCategoryCache(const char* aCategory);
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~nsCategoryCache() { if (mObserver) mObserver->ListenerDied(); }
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const nsCOMArray<T>& GetEntries() {
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// Lazy initialization, so that services in this category can't
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// cause reentrant getService (bug 386376)
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if (!mObserver)
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mObserver = new nsCategoryObserver(mCategoryName.get(), this);
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return mEntries;
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}
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protected:
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virtual void EntryAdded(const nsCString& aValue);
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virtual void EntryRemoved(const nsCString& aValue);
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virtual void CategoryCleared();
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private:
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friend class CategoryObserver;
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// Not to be implemented
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nsCategoryCache(const nsCategoryCache<T>&);
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nsCString mCategoryName;
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nsCOMArray<T> mEntries;
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nsRefPtr<nsCategoryObserver> mObserver;
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};
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// -----------------------------------
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// Implementation
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template<class T>
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nsCategoryCache<T>::nsCategoryCache(const char* aCategory)
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: mCategoryName(aCategory)
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{
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}
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template<class T>
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void nsCategoryCache<T>::EntryAdded(const nsCString& aValue) {
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nsCOMPtr<T> catEntry = do_GetService(aValue.get());
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if (catEntry)
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mEntries.AppendObject(catEntry);
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}
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template<class T>
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void nsCategoryCache<T>::EntryRemoved(const nsCString& aValue) {
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nsCOMPtr<T> catEntry = do_GetService(aValue.get());
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if (catEntry)
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mEntries.RemoveObject(catEntry);
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}
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template<class T>
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void nsCategoryCache<T>::CategoryCleared() {
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mEntries.Clear();
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}
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#endif
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