sync: Report GetUpdate triggers to the server

sync/sessions/sync_session.h

 // Copyright 2012 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.
 
 // A class representing an attempt to synchronize the local syncable data
 // store with a sync server. A SyncSession instance is passed as a stateful
 // bundle to and from various SyncerCommands with the goal of converging the
 // client view of data with that of the server. The commands twiddle with
 // session status in response to events and hiccups along the way, set and
 // query session progress with regards to conflict resolution and applying
@@ skipping 18 matching lines @@
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 #include "sync/sessions/ordered_commit_set.h"
 #include "sync/sessions/status_controller.h"
 #include "sync/sessions/sync_session_context.h"
 
 namespace syncer {
 class ModelSafeWorker;
 
 namespace sessions {
 
+class NudgeTracker;
+
 class SYNC_EXPORT_PRIVATE SyncSession {
  public:
   // The Delegate services events that occur during the session requiring an
   // explicit (and session-global) action, as opposed to events that are simply
   // recorded in per-session state.
   class SYNC_EXPORT_PRIVATE Delegate {
    public:
     // The client was throttled and should cease-and-desist syncing activity
     // until the specified time.
     virtual void OnSilencedUntil(const base::TimeTicks& silenced_until) = 0;
@@ skipping 30 matching lines @@
     // stops the current sync cycle and purges the client. In the new model
     // the former would be done by the |SyncProtocolError| and
     // the latter(which is an action) would be done in ProfileSyncService
     // along with the rest of the actions.
     virtual void OnShouldStopSyncingPermanently() = 0;
 
     // Called for the syncer to respond to the error sent by the server.
     virtual void OnSyncProtocolError(
         const sessions::SyncSessionSnapshot& snapshot) = 0;
 
+    // Called when the server wants to change the number of hints the client
+    // will buffer locally.
+    virtual void OnReceivedClientInvalidationHintBufferSize(int size) = 0;
+
    protected:
     virtual ~Delegate() {}
   };
 
-  SyncSession(SyncSessionContext* context,
-              Delegate* delegate,
-              const SyncSourceInfo& source);
+  // Build a session with a nudge tracker.  Used for sync cycles with origin of
+  // GU_TRIGGER (ie. notification, local change, and/or refresh request)
+  static SyncSession* BuildForNudge(SyncSessionContext* context,
+                                    Delegate* delegate,
+                                    const SyncSourceInfo& source,
+                                    const NudgeTracker* nudge_tracker);
+
+  // Build a session without a nudge tracker.  Used for poll or configure type
+  // sync cycles.
+  static SyncSession* Build(SyncSessionContext* context,
+                            Delegate* delegate,
+                            const SyncSourceInfo& source);
+
   ~SyncSession();
 
   // Builds a thread-safe and read-only copy of the current session state.
   SyncSessionSnapshot TakeSnapshot() const;
 
   // Builds and sends a snapshot to the session context's listeners.
   void SendEventNotification(SyncEngineEvent::EventCause cause);
 
   // TODO(akalin): Split this into context() and mutable_context().
   SyncSessionContext* context() const { return context_; }
   Delegate* delegate() const { return delegate_; }
   const StatusController& status_controller() const {
     return *status_controller_.get();
   }
   StatusController* mutable_status_controller() {
     return status_controller_.get();
   }
 
   const SyncSourceInfo& source() const { return source_; }
 
+  const NudgeTracker* nudge_tracker() const { return nudge_tracker_; }
+
  private:
+  SyncSession(SyncSessionContext* context,
+              Delegate* delegate,
+              const SyncSourceInfo& source,
+              const NudgeTracker* nudge_tracker);
+
   // The context for this session, guaranteed to outlive |this|.
   SyncSessionContext* const context_;
 
   // The source for initiating this sync session.
   SyncSourceInfo source_;
 
   // The delegate for this session, must never be NULL.
   Delegate* const delegate_;
 
   // Our controller for various status and error counters.
   scoped_ptr<StatusController> status_controller_;
 
+  const NudgeTracker* nudge_tracker_;
+
   DISALLOW_COPY_AND_ASSIGN(SyncSession);
 };
 
 }  // namespace sessions
 }  // namespace syncer
 
 #endif  // SYNC_SESSIONS_SYNC_SESSION_H_