extensions/renderer/gc_callback.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_RENDERER_GC_CALLBACK_H_
   6 #define EXTENSIONS_RENDERER_GC_CALLBACK_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/basictypes.h"
  12 #include "base/callback.h"
  13 #include "base/memory/weak_ptr.h"
  14 #include "v8/include/v8.h"
  15
  16 namespace extensions {
  17
  18 class ScriptContext;
  19
  20 // Runs |callback| when v8 garbage collects |object|, or |fallback| if
  21 // |context| is invalidated first. Exactly one of |callback| or |fallback| will
  22 // be called, after which it deletes itself.
  23 class GCCallback {
  24  public:
  25   GCCallback(ScriptContext* context,
  26              const v8::Local<v8::Object>& object,
  27              const v8::Local<v8::Function>& callback,
  28              const base::Closure& fallback);
  29   ~GCCallback();
  30
  31  private:
  32   static void OnObjectGC(const v8::WeakCallbackInfo<GCCallback>& data);
  33   void RunCallback();
  34   void OnContextInvalidated();
  35
  36   // The context which owns |object_|.
  37   ScriptContext* context_;
  38
  39   // The object this GCCallback is bound to.
  40   v8::Global<v8::Object> object_;
  41
  42   // The function to run when |object_| is garbage collected.
  43   v8::Global<v8::Function> callback_;
  44
  45   // The function to run if |context_| is invalidated before we have a chance
  46   // to execute |callback_|.
  47   base::Closure fallback_;
  48
  49   base::WeakPtrFactory<GCCallback> weak_ptr_factory_;
  50
  51   DISALLOW_COPY_AND_ASSIGN(GCCallback);
  52 };
  53
  54 }  // namespace extensions
  55
  56 #endif  // EXTENSIONS_RENDERER_GC_CALLBACK_H_