зеркало из https://github.com/mozilla/gecko-dev.git
813 строки
29 KiB
C++
813 строки
29 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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 mozilla_Preferences_h
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#define mozilla_Preferences_h
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#ifndef MOZILLA_INTERNAL_API
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#error "This header is only usable from within libxul (MOZILLA_INTERNAL_API)."
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#endif
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#include "mozilla/Atomics.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Result.h"
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#include "mozilla/StaticPtr.h"
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#include "nsCOMPtr.h"
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#include "nsIObserver.h"
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#include "nsIPrefBranch.h"
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#include "nsIPrefService.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "nsWeakReference.h"
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class nsIFile;
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// The callback function will get passed the pref name which triggered the call
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// and the void* data which was passed to the registered callback function.
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typedef void (*PrefChangedFunc)(const char* aPref, void* aData);
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class nsPrefBranch;
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namespace mozilla {
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// A typesafe version of PrefChangeFunc, with its data argument type deduced
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// from the type of the argument passed to RegisterCallback.
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//
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// Note: We specify this as a dependent type TypedPrefChangeFunc<T>::SelfType so
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// that it does not participate in argument type deduction. This allows us to
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// use its implicit conversion constructor, and also allows our Register and
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// Unregister methods to accept non-capturing lambdas (which will not match
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// void(*)(const char*, T*) when used in type deduction) as callback functions.
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template<typename T>
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struct TypedPrefChangeFunc
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{
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using Type = TypedPrefChangeFunc<T>;
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using CallbackType = void (*)(const char*, T*);
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MOZ_IMPLICIT TypedPrefChangeFunc(CallbackType aCallback)
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: mCallback(aCallback)
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{
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}
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template<typename F>
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MOZ_IMPLICIT TypedPrefChangeFunc(F&& aLambda)
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: mCallback(aLambda)
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{
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}
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operator PrefChangedFunc() const
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{
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return reinterpret_cast<PrefChangedFunc>(mCallback);
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}
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CallbackType mCallback;
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};
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// Similar to PrefChangedFunc, but for use with instance methods.
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//
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// Any instance method with this signature may be passed to the
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// PREF_CHANGE_METHOD macro, which will wrap it into a typesafe preference
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// callback function, which accepts a preference name as its first argument, and
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// an instance of the appropriate class as the second.
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//
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// When called, the wrapper will forward the call to the wrapped method on the
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// given instance, with the notified preference as its only argument.
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typedef void(PrefChangedMethod)(const char* aPref);
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namespace detail {
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// Helper to extract the instance type from any instance method. For an instance
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// method `Method = U T::*`, InstanceType<Method>::Type returns T.
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template<typename T>
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struct InstanceType;
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template<typename T, typename U>
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struct InstanceType<U T::*>
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{
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using Type = T;
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};
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// A wrapper for a PrefChangeMethod instance method which forwards calls to the
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// wrapped method on the given instance.
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template<typename T, PrefChangedMethod T::*Method>
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void
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PrefChangeMethod(const char* aPref, T* aInst)
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{
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((*aInst).*Method)(aPref);
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}
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} // namespace detail
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// Creates a wrapper around an instance method, with the signature of
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// PrefChangedMethod, from an arbitrary class, so that it can be used as a
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// preference callback. The closure data passed to RegisterCallback must be an
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// instance of this class.
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//
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// Note: This is implemented as a macro rather than a pure template function
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// because, prior to C++17, value template arguments must have their types
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// fully-specified. Once all of our supported compilers have C++17 support, we
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// can give PrefChangeMethod a single <auto Method> argument, and use
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// PrefChangeMethod<&meth> directly.
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#define PREF_CHANGE_METHOD(meth) \
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(&::mozilla::detail::PrefChangeMethod< \
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::mozilla::detail::InstanceType<decltype(&meth)>::Type, \
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&meth>)
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class PreferenceServiceReporter;
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namespace dom {
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class Pref;
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class PrefValue;
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} // namespace dom
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namespace ipc {
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class FileDescriptor;
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} // namespace ipc
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struct PrefsSizes;
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// Xlib.h defines Bool as a macro constant. Don't try to define this enum if
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// it's already been included.
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#ifndef Bool
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// Keep this in sync with PrefType in parser/src/lib.rs.
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enum class PrefType : uint8_t
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{
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None = 0, // only used when neither the default nor user value is set
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String = 1,
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Int = 2,
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Bool = 3,
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};
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#endif
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#ifdef XP_UNIX
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// We need to send two shared memory descriptors to every child process:
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//
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// 1) A read-only/write-protected snapshot of the initial state of the
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// preference database. This memory is shared between all processes, and
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// therefore cannot be modified once it has been created.
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//
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// 2) A set of changes on top of the snapshot, containing the current values of
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// all preferences which have changed since it was created.
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//
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// Since the second set will be different for every process, and the first set
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// cannot be modified, it is unfortunately not possible to combine them into a
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// single file descriptor.
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//
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// XXX: bug 1440207 is about improving how fixed fds such as this are used.
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static const int kPrefsFileDescriptor = 8;
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static const int kPrefMapFileDescriptor = 9;
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#endif
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// Keep this in sync with PrefType in parser/src/lib.rs.
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enum class PrefValueKind : uint8_t
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{
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Default,
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User
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};
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class Preferences final
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: public nsIPrefService
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, public nsIObserver
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, public nsIPrefBranch
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, public nsSupportsWeakReference
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{
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friend class ::nsPrefBranch;
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIPREFSERVICE
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NS_FORWARD_NSIPREFBRANCH(mRootBranch->)
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NS_DECL_NSIOBSERVER
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Preferences();
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// Returns true if the Preferences service is available, false otherwise.
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static bool IsServiceAvailable();
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// Initialize user prefs from prefs.js/user.js
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static void InitializeUserPrefs();
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// Returns the singleton instance which is addreffed.
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static already_AddRefed<Preferences> GetInstanceForService();
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// Finallizes global members.
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static void Shutdown();
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// Returns shared pref service instance NOTE: not addreffed.
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static nsIPrefService* GetService()
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{
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NS_ENSURE_TRUE(InitStaticMembers(), nullptr);
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return sPreferences;
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}
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// Returns shared pref branch instance. NOTE: not addreffed.
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static nsIPrefBranch* GetRootBranch(PrefValueKind aKind = PrefValueKind::User)
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{
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NS_ENSURE_TRUE(InitStaticMembers(), nullptr);
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return (aKind == PrefValueKind::Default) ? sPreferences->mDefaultRootBranch
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: sPreferences->mRootBranch;
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}
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// Gets the type of the pref.
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static int32_t GetType(const char* aPrefName);
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// Fallible value getters. When `aKind` is `User` they will get the user
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// value if possible, and fall back to the default value otherwise.
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static nsresult GetBool(const char* aPrefName,
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bool* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetInt(const char* aPrefName,
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int32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetUint(const char* aPrefName,
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uint32_t* aResult,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return GetInt(aPrefName, reinterpret_cast<int32_t*>(aResult), aKind);
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}
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static nsresult GetFloat(const char* aPrefName,
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float* aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetCString(const char* aPrefName,
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nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetString(const char* aPrefName,
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nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedCString(
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const char* aPrefName,
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nsACString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetLocalizedString(const char* aPrefName,
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nsAString& aResult,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult GetComplex(const char* aPrefName,
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const nsIID& aType,
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void** aResult,
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PrefValueKind aKind = PrefValueKind::User);
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// Infallible getters of user or default values, with fallback results on
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// failure. When `aKind` is `User` they will get the user value if possible,
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// and fall back to the default value otherwise.
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static bool GetBool(const char* aPrefName,
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bool aFallback = false,
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PrefValueKind aKind = PrefValueKind::User)
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{
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bool result = aFallback;
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GetBool(aPrefName, &result, aKind);
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return result;
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}
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static int32_t GetInt(const char* aPrefName,
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int32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User)
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{
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int32_t result = aFallback;
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GetInt(aPrefName, &result, aKind);
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return result;
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}
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static uint32_t GetUint(const char* aPrefName,
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uint32_t aFallback = 0,
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PrefValueKind aKind = PrefValueKind::User)
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{
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uint32_t result = aFallback;
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GetUint(aPrefName, &result, aKind);
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return result;
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}
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static float GetFloat(const char* aPrefName,
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float aFallback = 0.0f,
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PrefValueKind aKind = PrefValueKind::User)
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{
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float result = aFallback;
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GetFloat(aPrefName, &result, aKind);
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return result;
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}
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// Value setters. These fail if run outside the parent process.
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static nsresult SetBool(const char* aPrefName,
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bool aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetInt(const char* aPrefName,
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int32_t aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetCString(const char* aPrefName,
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const nsACString& aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult SetUint(const char* aPrefName,
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uint32_t aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return SetInt(aPrefName, static_cast<int32_t>(aValue), aKind);
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}
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static nsresult SetFloat(const char* aPrefName,
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float aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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nsAutoCString value;
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value.AppendFloat(aValue);
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return SetCString(aPrefName, value, aKind);
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}
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static nsresult SetCString(const char* aPrefName,
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const char* aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, nsDependentCString(aValue), aKind);
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}
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static nsresult SetString(const char* aPrefName,
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const char16ptr_t aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, NS_ConvertUTF16toUTF8(aValue), aKind);
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}
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static nsresult SetString(const char* aPrefName,
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const nsAString& aValue,
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PrefValueKind aKind = PrefValueKind::User)
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{
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return Preferences::SetCString(
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aPrefName, NS_ConvertUTF16toUTF8(aValue), aKind);
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}
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static nsresult SetComplex(const char* aPrefName,
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const nsIID& aType,
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nsISupports* aValue,
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PrefValueKind aKind = PrefValueKind::User);
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static nsresult Lock(const char* aPrefName);
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static nsresult Unlock(const char* aPrefName);
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static bool IsLocked(const char* aPrefName);
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// Clears user set pref. Fails if run outside the parent process.
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static nsresult ClearUser(const char* aPrefName);
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// Whether the pref has a user value or not.
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static bool HasUserValue(const char* aPref);
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// Adds/Removes the observer for the root pref branch. See nsIPrefBranch.idl
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// for details.
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static nsresult AddStrongObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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static nsresult AddWeakObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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static nsresult RemoveObserver(nsIObserver* aObserver,
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const nsACString& aPref);
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template<int N>
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static nsresult AddStrongObserver(nsIObserver* aObserver,
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const char (&aPref)[N])
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{
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return AddStrongObserver(aObserver, nsLiteralCString(aPref));
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}
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template<int N>
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static nsresult AddWeakObserver(nsIObserver* aObserver,
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const char (&aPref)[N])
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{
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return AddWeakObserver(aObserver, nsLiteralCString(aPref));
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}
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template<int N>
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static nsresult RemoveObserver(nsIObserver* aObserver, const char (&aPref)[N])
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{
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return RemoveObserver(aObserver, nsLiteralCString(aPref));
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}
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// Adds/Removes two or more observers for the root pref branch. Pass to
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// aPrefs an array of const char* whose last item is nullptr.
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// Note: All preference strings *must* be statically-allocated string
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// literals.
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static nsresult AddStrongObservers(nsIObserver* aObserver,
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const char** aPrefs);
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static nsresult AddWeakObservers(nsIObserver* aObserver, const char** aPrefs);
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static nsresult RemoveObservers(nsIObserver* aObserver, const char** aPrefs);
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// Registers/Unregisters the callback function for the aPref.
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template<typename T = void>
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static nsresult RegisterCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return RegisterCallback(aCallback, aPref, aClosure, ExactMatch);
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}
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template<typename T = void>
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static nsresult UnregisterCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return UnregisterCallback(aCallback, aPref, aClosure, ExactMatch);
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}
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// Like RegisterCallback, but also calls the callback immediately for
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// initialization.
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template<typename T = void>
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static nsresult RegisterCallbackAndCall(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return RegisterCallbackAndCall(aCallback, aPref, aClosure, ExactMatch);
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}
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// Like RegisterCallback, but registers a callback for a prefix of multiple
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// pref names, not a single pref name.
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template<typename T = void>
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static nsresult RegisterPrefixCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return RegisterCallback(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Like RegisterPrefixCallback, but also calls the callback immediately for
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// initialization.
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template<typename T = void>
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static nsresult RegisterPrefixCallbackAndCall(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return RegisterCallbackAndCall(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Unregister a callback registered with RegisterPrefixCallback or
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// RegisterPrefixCallbackAndCall.
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template<typename T = void>
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static nsresult UnregisterPrefixCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const nsACString& aPref,
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T* aClosure = nullptr)
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{
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return UnregisterCallback(aCallback, aPref, aClosure, PrefixMatch);
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}
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// Variants of the above which register a single callback to handle multiple
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// preferences.
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//
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// The array of preference names must be null terminated. It may be
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// dynamically allocated, but the caller is responsible for keeping it alive
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// until the callback is unregistered.
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//
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// Also note that the exact same aPrefs pointer must be passed to the
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// Unregister call as was passed to the Register call.
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template<typename T = void>
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static nsresult RegisterCallbacks(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char** aPrefs,
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T* aClosure = nullptr)
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{
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return RegisterCallbacks(aCallback, aPrefs, aClosure, ExactMatch);
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}
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static nsresult RegisterCallbacksAndCall(PrefChangedFunc aCallback,
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const char** aPrefs,
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void* aClosure = nullptr);
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template<typename T = void>
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static nsresult UnregisterCallbacks(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char** aPrefs,
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T* aClosure = nullptr)
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{
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return UnregisterCallbacks(aCallback, aPrefs, aClosure, ExactMatch);
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}
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template<typename T = void>
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static nsresult RegisterPrefixCallbacks(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char** aPrefs,
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T* aClosure = nullptr)
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{
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return RegisterCallbacks(aCallback, aPrefs, aClosure, PrefixMatch);
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}
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template<typename T = void>
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static nsresult UnregisterPrefixCallbacks(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char** aPrefs,
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T* aClosure = nullptr)
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{
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return UnregisterCallbacks(aCallback, aPrefs, aClosure, PrefixMatch);
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}
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template<int N, typename T = void>
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static nsresult RegisterCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char (&aPref)[N],
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T* aClosure = nullptr)
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{
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return RegisterCallback(
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aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
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}
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template<int N, typename T = void>
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static nsresult UnregisterCallback(
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typename TypedPrefChangeFunc<T>::Type aCallback,
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const char (&aPref)[N],
|
|
T* aClosure = nullptr)
|
|
{
|
|
return UnregisterCallback(
|
|
aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
|
|
}
|
|
|
|
template<int N, typename T = void>
|
|
static nsresult RegisterCallbackAndCall(
|
|
typename TypedPrefChangeFunc<T>::Type aCallback,
|
|
const char (&aPref)[N],
|
|
T* aClosure = nullptr)
|
|
{
|
|
return RegisterCallbackAndCall(
|
|
aCallback, nsLiteralCString(aPref), aClosure, ExactMatch);
|
|
}
|
|
|
|
template<int N, typename T = void>
|
|
static nsresult RegisterPrefixCallback(
|
|
typename TypedPrefChangeFunc<T>::Type aCallback,
|
|
const char (&aPref)[N],
|
|
T* aClosure = nullptr)
|
|
{
|
|
return RegisterCallback(
|
|
aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
|
|
}
|
|
|
|
template<int N, typename T = void>
|
|
static nsresult RegisterPrefixCallbackAndCall(
|
|
typename TypedPrefChangeFunc<T>::Type aCallback,
|
|
const char (&aPref)[N],
|
|
T* aClosure = nullptr)
|
|
{
|
|
return RegisterCallbackAndCall(
|
|
aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
|
|
}
|
|
|
|
template<int N, typename T = void>
|
|
static nsresult UnregisterPrefixCallback(
|
|
typename TypedPrefChangeFunc<T>::Type aCallback,
|
|
const char (&aPref)[N],
|
|
T* aClosure = nullptr)
|
|
{
|
|
return UnregisterCallback(
|
|
aCallback, nsLiteralCString(aPref), aClosure, PrefixMatch);
|
|
}
|
|
|
|
// Adds the aVariable to cache table. |aVariable| must be a pointer for a
|
|
// static variable. The value will be modified when the pref value is changed
|
|
// but note that even if you modified it, the value isn't assigned to the
|
|
// pref.
|
|
static nsresult AddBoolVarCache(bool* aVariable,
|
|
const nsACString& aPref,
|
|
bool aDefault = false,
|
|
bool aSkipAssignment = false);
|
|
template<MemoryOrdering Order>
|
|
static nsresult AddAtomicBoolVarCache(Atomic<bool, Order>* aVariable,
|
|
const nsACString& aPref,
|
|
bool aDefault = false,
|
|
bool aSkipAssignment = false);
|
|
static nsresult AddIntVarCache(int32_t* aVariable,
|
|
const nsACString& aPref,
|
|
int32_t aDefault = 0,
|
|
bool aSkipAssignment = false);
|
|
template<MemoryOrdering Order>
|
|
static nsresult AddAtomicIntVarCache(Atomic<int32_t, Order>* aVariable,
|
|
const nsACString& aPref,
|
|
int32_t aDefault = 0,
|
|
bool aSkipAssignment = false);
|
|
static nsresult AddUintVarCache(uint32_t* aVariable,
|
|
const nsACString& aPref,
|
|
uint32_t aDefault = 0,
|
|
bool aSkipAssignment = false);
|
|
template<MemoryOrdering Order>
|
|
static nsresult AddAtomicUintVarCache(Atomic<uint32_t, Order>* aVariable,
|
|
const nsACString& aPref,
|
|
uint32_t aDefault = 0,
|
|
bool aSkipAssignment = false);
|
|
static nsresult AddFloatVarCache(float* aVariable,
|
|
const nsACString& aPref,
|
|
float aDefault = 0.0f,
|
|
bool aSkipAssignment = false);
|
|
|
|
template<int N>
|
|
static nsresult AddBoolVarCache(bool* aVariable,
|
|
const char (&aPref)[N],
|
|
bool aDefault = false,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddBoolVarCache(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<MemoryOrdering Order, int N>
|
|
static nsresult AddAtomicBoolVarCache(Atomic<bool, Order>* aVariable,
|
|
const char (&aPref)[N],
|
|
bool aDefault = false,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddAtomicBoolVarCache<Order>(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<int N>
|
|
static nsresult AddIntVarCache(int32_t* aVariable,
|
|
const char (&aPref)[N],
|
|
int32_t aDefault = 0,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddIntVarCache(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<MemoryOrdering Order, int N>
|
|
static nsresult AddAtomicIntVarCache(Atomic<int32_t, Order>* aVariable,
|
|
const char (&aPref)[N],
|
|
int32_t aDefault = 0,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddAtomicIntVarCache<Order>(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<int N>
|
|
static nsresult AddUintVarCache(uint32_t* aVariable,
|
|
const char (&aPref)[N],
|
|
uint32_t aDefault = 0,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddUintVarCache(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<MemoryOrdering Order, int N>
|
|
static nsresult AddAtomicUintVarCache(Atomic<uint32_t, Order>* aVariable,
|
|
const char (&aPref)[N],
|
|
uint32_t aDefault = 0,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddAtomicUintVarCache<Order>(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
template<int N>
|
|
static nsresult AddFloatVarCache(float* aVariable,
|
|
const char (&aPref)[N],
|
|
float aDefault = 0.0f,
|
|
bool aSkipAssignment = false)
|
|
{
|
|
return AddFloatVarCache(
|
|
aVariable, nsLiteralCString(aPref), aDefault, aSkipAssignment);
|
|
}
|
|
|
|
// When a content process is created these methods are used to pass changed
|
|
// prefs in bulk from the parent process, via shared memory.
|
|
static void SerializePreferences(nsCString& aStr);
|
|
static void DeserializePreferences(char* aStr, size_t aPrefsLen);
|
|
|
|
static mozilla::ipc::FileDescriptor EnsureSnapshot(size_t* aSize);
|
|
static void InitSnapshot(const mozilla::ipc::FileDescriptor&, size_t aSize);
|
|
|
|
// When a single pref is changed in the parent process, these methods are
|
|
// used to pass the update to content processes.
|
|
static void GetPreference(dom::Pref* aPref);
|
|
static void SetPreference(const dom::Pref& aPref);
|
|
|
|
#ifdef DEBUG
|
|
static bool ArePrefsInitedInContentProcess();
|
|
#endif
|
|
|
|
static void AddSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf,
|
|
PrefsSizes& aSizes);
|
|
|
|
static void HandleDirty();
|
|
|
|
// Explicitly choosing synchronous or asynchronous (if allowed) preferences
|
|
// file write. Only for the default file. The guarantee for the "blocking"
|
|
// is that when it returns, the file on disk reflect the current state of
|
|
// preferences.
|
|
nsresult SavePrefFileBlocking();
|
|
nsresult SavePrefFileAsynchronous();
|
|
|
|
private:
|
|
virtual ~Preferences();
|
|
|
|
nsresult NotifyServiceObservers(const char* aSubject);
|
|
|
|
// Loads the prefs.js file from the profile, or creates a new one. Returns
|
|
// the prefs file if successful, or nullptr on failure.
|
|
already_AddRefed<nsIFile> ReadSavedPrefs();
|
|
|
|
// Loads the user.js file from the profile if present.
|
|
void ReadUserOverridePrefs();
|
|
|
|
nsresult MakeBackupPrefFile(nsIFile* aFile);
|
|
|
|
// Default pref file save can be blocking or not.
|
|
enum class SaveMethod
|
|
{
|
|
Blocking,
|
|
Asynchronous
|
|
};
|
|
|
|
// Off main thread is only respected for the default aFile value (nullptr).
|
|
nsresult SavePrefFileInternal(nsIFile* aFile, SaveMethod aSaveMethod);
|
|
nsresult WritePrefFile(nsIFile* aFile, SaveMethod aSaveMethod);
|
|
|
|
// If this is false, only blocking writes, on main thread are allowed.
|
|
bool AllowOffMainThreadSave();
|
|
|
|
// Helpers for implementing
|
|
// Register(Prefix)Callback/Unregister(Prefix)Callback.
|
|
public:
|
|
// Public so the ValueObserver classes can use it.
|
|
enum MatchKind
|
|
{
|
|
PrefixMatch,
|
|
ExactMatch,
|
|
};
|
|
|
|
private:
|
|
static void SetupTelemetryPref();
|
|
static mozilla::Result<mozilla::Ok, const char*> InitInitialObjects(
|
|
bool aIsStartup);
|
|
|
|
static nsresult RegisterCallback(PrefChangedFunc aCallback,
|
|
const nsACString& aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind,
|
|
bool aIsPriority = false);
|
|
static nsresult UnregisterCallback(PrefChangedFunc aCallback,
|
|
const nsACString& aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind);
|
|
static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
|
|
const nsACString& aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind);
|
|
|
|
static nsresult RegisterCallbacks(PrefChangedFunc aCallback,
|
|
const char** aPrefs,
|
|
void* aClosure,
|
|
MatchKind aMatchKind);
|
|
static nsresult UnregisterCallbacks(PrefChangedFunc aCallback,
|
|
const char** aPrefs,
|
|
void* aClosure,
|
|
MatchKind aMatchKind);
|
|
|
|
template<typename T>
|
|
static nsresult RegisterCallbackImpl(PrefChangedFunc aCallback,
|
|
T& aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind,
|
|
bool aIsPriority = false);
|
|
template<typename T>
|
|
static nsresult UnregisterCallbackImpl(PrefChangedFunc aCallback,
|
|
T& aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind);
|
|
|
|
static nsresult RegisterCallback(PrefChangedFunc aCallback,
|
|
const char* aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind,
|
|
bool aIsPriority = false)
|
|
{
|
|
return RegisterCallback(
|
|
aCallback, nsDependentCString(aPref), aClosure, aMatchKind, aIsPriority);
|
|
}
|
|
static nsresult UnregisterCallback(PrefChangedFunc aCallback,
|
|
const char* aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind)
|
|
{
|
|
return UnregisterCallback(
|
|
aCallback, nsDependentCString(aPref), aClosure, aMatchKind);
|
|
}
|
|
static nsresult RegisterCallbackAndCall(PrefChangedFunc aCallback,
|
|
const char* aPref,
|
|
void* aClosure,
|
|
MatchKind aMatchKind)
|
|
{
|
|
return RegisterCallbackAndCall(
|
|
aCallback, nsDependentCString(aPref), aClosure, aMatchKind);
|
|
}
|
|
|
|
private:
|
|
nsCOMPtr<nsIFile> mCurrentFile;
|
|
bool mDirty = false;
|
|
bool mProfileShutdown = false;
|
|
// We wait a bit after prefs are dirty before writing them. In this period,
|
|
// mDirty and mSavePending will both be true.
|
|
bool mSavePending = false;
|
|
|
|
nsCOMPtr<nsIPrefBranch> mRootBranch;
|
|
nsCOMPtr<nsIPrefBranch> mDefaultRootBranch;
|
|
|
|
static StaticRefPtr<Preferences> sPreferences;
|
|
static bool sShutdown;
|
|
|
|
// Init static members. Returns true on success.
|
|
static bool InitStaticMembers();
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_Preferences_h
|