Content API changes to integrate base/graph.

content/public/browser/browser_context.h

Index: content/public/browser/browser_context.h
diff --git a/content/public/browser/browser_context.h b/content/public/browser/browser_context.h
index c7c664d097e5d5fe2a4c5546d84afadfceb22ebf..f38d38635051b57f00025813ab1300e1d5c75e23 100644
--- a/content/public/browser/browser_context.h
+++ b/content/public/browser/browser_context.h
@@ -5,11 +5,14 @@
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
-#include "base/callback_forward.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/supports_user_data.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/graph/browser_context_dependency_visitor.h"
+#include "content/public/browser/graph/browser_context_dependency_visitor_impl.h"
 #include "ui/base/clipboard/clipboard_sourcetag.h"
 
 class GURL;
@@ -22,6 +25,10 @@ namespace fileapi {
 class ExternalMountPoints;
 }
 
+namespace graph {
+class DependencyManagerInstance;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
@@ -154,6 +161,64 @@ class CONTENT_EXPORT BrowserContext : public base::SupportsUserData {
 
   // Returns a special storage policy implementation, or NULL.
   virtual quota::SpecialStoragePolicy* GetSpecialStoragePolicy() = 0;
+
+  // Retrieves a Component instance associated with the BrowserContext.
+  // |completion_callback| will be invoked when the Component instance is fully
+  // initialized, or during Profile shutdown (with a NULL Component pointer) if
+  // the initialization has not completed by that time.
+  // This should only be called on the UI thread. |completion_callback| will
+  // always be called back on the UI thread.
+  template <typename Component>
+      void Get(base::Callback<void(Component*)> completion_callback) {
+    VisitDependencyManager(scoped_ptr<BrowserContextDependencyVisitor>(
+        new BrowserContextDependencyVisitorImpl<Component>(
+            completion_callback)));
+  }
+
+  // Attempts to synchronously retrieve a Component instance associated with the
+  // BrowserContext. If the component is available, the return value will be
+  // |true|, and |component_storage| will contain the component instance. If the
+  // component is not available, then the return value will be |false| and
+  // |component_storage| will contain a NULL pointer.
+  // It is the callers responsibility to check that the component was
+  // successfully retrieved before using it.
+  template <typename Component>
+      bool GetNow(Component** component_storage) WARN_UNUSED_RESULT {
+    graph::DependencyManagerInstance* manager = GetDependencyManager();
+    if (!manager) {
+      *component_storage = NULL;
+      return false;
+    }
+
+    return manager->GetNow<Component>(component_storage);
+  }
+
+  // Attempts to synchronously retrieve a Component instance associated with the
+  // BrowserContext. If the component is available, the return value will be
+  // |true|, and |component_storage| will contain the component instance. If the
+  // component is not available, then the return value will be |false| and
+  // |component_storage| will contain a NULL pointer.
+  // It is the callers responsibility to check that the component was
+  // successfully retrieved before using it.
+  template <typename Component> bool IsDefined() {
+    graph::DependencyManagerInstance* manager = GetDependencyManager();
+    if (!manager) {
+      return false;
+    }
+
+    return manager->IsDefined<Component>();
+  }
+
+ private:
+  // Executes visitor against the DependencyManagerInstance associated with
+  // this BrowserContext, possibly asynchronously if the
+  // DependencyManagerInstance is not fully initialized yet.
+  // May be executed against a NULL DependencyManagerInstance pointer if
+  // shutdown begins before the DependencyManagerInstance is fully initialized.
+  virtual void VisitDependencyManager(
+      scoped_ptr<content::BrowserContextDependencyVisitor> visitor) = 0;
+
+  virtual graph::DependencyManagerInstance* GetDependencyManager() = 0;
 };
 
 }  // namespace content