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mojo/services/view_manager/connection_manager.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SERVICES_VIEW_MANAGER_CONNECTION_MANAGER_H_
+#define SERVICES_VIEW_MANAGER_CONNECTION_MANAGER_H_
+
+#include <map>
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/timer/timer.h"
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/services/view_manager/animation_runner.h"
+#include "mojo/services/view_manager/ids.h"
+#include "mojo/services/view_manager/server_view_delegate.h"
+#include "third_party/mojo_services/src/view_manager/public/interfaces/view_manager.mojom.h"
+#include "third_party/mojo_services/src/window_manager/public/interfaces/window_manager_internal.mojom.h"
+
+namespace view_manager {
+
+class ClientConnection;
+class ConnectionManagerDelegate;
+class DisplayManager;
+class ServerView;
+class ViewManagerServiceImpl;
+
+// ConnectionManager manages the set of connections to the ViewManager (all the
+// ViewManagerServiceImpls) as well as providing the root of the hierarchy.
+class ConnectionManager : public ServerViewDelegate,
+                          public mojo::WindowManagerInternalClient {
+ public:
+  // Create when a ViewManagerServiceImpl is about to make a change. Ensures
+  // clients are notified correctly.
+  class ScopedChange {
+   public:
+    ScopedChange(ViewManagerServiceImpl* connection,
+                 ConnectionManager* connection_manager,
+                 bool is_delete_view);
+    ~ScopedChange();
+
+    mojo::ConnectionSpecificId connection_id() const { return connection_id_; }
+    bool is_delete_view() const { return is_delete_view_; }
+
+    // Marks the connection with the specified id as having seen a message.
+    void MarkConnectionAsMessaged(mojo::ConnectionSpecificId connection_id) {
+      message_ids_.insert(connection_id);
+    }
+
+    // Returns true if MarkConnectionAsMessaged(connection_id) was invoked.
+    bool DidMessageConnection(mojo::ConnectionSpecificId connection_id) const {
+      return message_ids_.count(connection_id) > 0;
+    }
+
+   private:
+    ConnectionManager* connection_manager_;
+    const mojo::ConnectionSpecificId connection_id_;
+    const bool is_delete_view_;
+
+    // See description of MarkConnectionAsMessaged/DidMessageConnection.
+    std::set<mojo::ConnectionSpecificId> message_ids_;
+
+    DISALLOW_COPY_AND_ASSIGN(ScopedChange);
+  };
+
+  ConnectionManager(ConnectionManagerDelegate* delegate,
+                    scoped_ptr<DisplayManager> display_manager,
+                    mojo::WindowManagerInternal* wm_internal);
+  ~ConnectionManager() override;
+
+  // Returns the id for the next ViewManagerServiceImpl.
+  mojo::ConnectionSpecificId GetAndAdvanceNextConnectionId();
+
+  // Invoked when a ViewManagerServiceImpl's connection encounters an error.
+  void OnConnectionError(ClientConnection* connection);
+
+  // See description of ViewManagerService::Embed() for details. This assumes
+  // |transport_view_id| is valid.
+  void EmbedAtView(mojo::ConnectionSpecificId creator_id,
+                   const std::string& url,
+                   const ViewId& view_id,
+                   mojo::InterfaceRequest<mojo::ServiceProvider> services,
+                   mojo::ServiceProviderPtr exposed_services);
+  void EmbedAtView(mojo::ConnectionSpecificId creator_id,
+                   const ViewId& view_id,
+                   mojo::ViewManagerClientPtr client);
+
+  // Returns the connection by id.
+  ViewManagerServiceImpl* GetConnection(
+      mojo::ConnectionSpecificId connection_id);
+
+  // Returns the View identified by |id|.
+  ServerView* GetView(const ViewId& id);
+
+  ServerView* root() { return root_.get(); }
+  DisplayManager* display_manager() { return display_manager_.get(); }
+
+  bool IsProcessingChange() const { return current_change_ != NULL; }
+
+  bool is_processing_delete_view() const {
+    return current_change_ && current_change_->is_delete_view();
+  }
+
+  // Invoked when a connection messages a client about the change. This is used
+  // to avoid sending ServerChangeIdAdvanced() unnecessarily.
+  void OnConnectionMessagedClient(mojo::ConnectionSpecificId id);
+
+  // Returns true if OnConnectionMessagedClient() was invoked for id.
+  bool DidConnectionMessageClient(mojo::ConnectionSpecificId id) const;
+
+  // Returns the ViewManagerServiceImpl that has |id| as a root.
+  ViewManagerServiceImpl* GetConnectionWithRoot(const ViewId& id) {
+    return const_cast<ViewManagerServiceImpl*>(
+        const_cast<const ConnectionManager*>(this)->GetConnectionWithRoot(id));
+  }
+  const ViewManagerServiceImpl* GetConnectionWithRoot(const ViewId& id) const;
+
+  mojo::WindowManagerInternal* wm_internal() { return wm_internal_; }
+
+  void SetWindowManagerClientConnection(
+      scoped_ptr<ClientConnection> connection);
+  bool has_window_manager_client_connection() const {
+    return window_manager_client_connection_ != nullptr;
+  }
+
+  mojo::ViewManagerClient* GetWindowManagerViewManagerClient();
+
+  // WindowManagerInternalClient implementation helper; see mojom for details.
+  bool CloneAndAnimate(const ViewId& view_id);
+
+  // These functions trivially delegate to all ViewManagerServiceImpls, which in
+  // term notify their clients.
+  void ProcessViewDestroyed(ServerView* view);
+  void ProcessViewBoundsChanged(const ServerView* view,
+                                const gfx::Rect& old_bounds,
+                                const gfx::Rect& new_bounds);
+  void ProcessViewportMetricsChanged(const mojo::ViewportMetrics& old_metrics,
+                                     const mojo::ViewportMetrics& new_metrics);
+  void ProcessWillChangeViewHierarchy(const ServerView* view,
+                                      const ServerView* new_parent,
+                                      const ServerView* old_parent);
+  void ProcessViewHierarchyChanged(const ServerView* view,
+                                   const ServerView* new_parent,
+                                   const ServerView* old_parent);
+  void ProcessViewReorder(const ServerView* view,
+                          const ServerView* relative_view,
+                          const mojo::OrderDirection direction);
+  void ProcessViewDeleted(const ViewId& view);
+
+ private:
+  typedef std::map<mojo::ConnectionSpecificId, ClientConnection*> ConnectionMap;
+
+  // Invoked when a connection is about to make a change.  Subsequently followed
+  // by FinishChange() once the change is done.
+  //
+  // Changes should never nest, meaning each PrepareForChange() must be
+  // balanced with a call to FinishChange() with no PrepareForChange()
+  // in between.
+  void PrepareForChange(ScopedChange* change);
+
+  // Balances a call to PrepareForChange().
+  void FinishChange();
+
+  // Returns true if the specified connection originated the current change.
+  bool IsChangeSource(mojo::ConnectionSpecificId connection_id) const {
+    return current_change_ && current_change_->connection_id() == connection_id;
+  }
+
+  // Adds |connection| to internal maps.
+  void AddConnection(ClientConnection* connection);
+
+  // Callback from animation timer.
+  // TODO(sky): make this real (move to a different class).
+  void DoAnimation();
+
+  // Overridden from ServerViewDelegate:
+  void OnWillDestroyView(ServerView* view) override;
+  void OnViewDestroyed(const ServerView* view) override;
+  void OnWillChangeViewHierarchy(ServerView* view,
+                                 ServerView* new_parent,
+                                 ServerView* old_parent) override;
+  void OnViewHierarchyChanged(const ServerView* view,
+                              const ServerView* new_parent,
+                              const ServerView* old_parent) override;
+  void OnViewBoundsChanged(const ServerView* view,
+                           const gfx::Rect& old_bounds,
+                           const gfx::Rect& new_bounds) override;
+  void OnViewSurfaceIdChanged(const ServerView* view) override;
+  void OnViewReordered(const ServerView* view,
+                       const ServerView* relative,
+                       mojo::OrderDirection direction) override;
+  void OnWillChangeViewVisibility(ServerView* view) override;
+  void OnViewSharedPropertyChanged(
+      const ServerView* view,
+      const std::string& name,
+      const std::vector<uint8_t>* new_data) override;
+  void OnScheduleViewPaint(const ServerView* view) override;
+
+  // WindowManagerInternalClient:
+  void DispatchInputEventToView(mojo::Id transport_view_id,
+                                mojo::EventPtr event) override;
+  void SetViewportSize(mojo::SizePtr size) override;
+  void CloneAndAnimate(mojo::Id transport_view_id) override;
+
+  ConnectionManagerDelegate* delegate_;
+
+  // The ClientConnection containing the ViewManagerService implementation
+  // provided to the initial connection (the WindowManager).
+  // NOTE: |window_manager_client_connection_| is also in |connection_map_|.
+  ClientConnection* window_manager_client_connection_;
+
+  // ID to use for next ViewManagerServiceImpl.
+  mojo::ConnectionSpecificId next_connection_id_;
+
+  // Set of ViewManagerServiceImpls.
+  ConnectionMap connection_map_;
+
+  scoped_ptr<DisplayManager> display_manager_;
+
+  scoped_ptr<ServerView> root_;
+
+  mojo::WindowManagerInternal* wm_internal_;
+
+  // If non-null we're processing a change. The ScopedChange is not owned by us
+  // (it's created on the stack by ViewManagerServiceImpl).
+  ScopedChange* current_change_;
+
+  bool in_destructor_;
+
+  // TODO(sky): nuke! Just a proof of concept until get real animation api.
+  base::RepeatingTimer<ConnectionManager> animation_timer_;
+
+  AnimationRunner animation_runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConnectionManager);
+};
+
+}  // namespace view_manager
+
+#endif  // SERVICES_VIEW_MANAGER_CONNECTION_MANAGER_H_