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      1 // Copyright 2012 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 SYNC_INTERNAL_API_JS_MUTATION_EVENT_OBSERVER_H_
      6 #define SYNC_INTERNAL_API_JS_MUTATION_EVENT_OBSERVER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "base/memory/weak_ptr.h"
     13 #include "base/threading/non_thread_safe.h"
     14 #include "sync/base/sync_export.h"
     15 #include "sync/internal_api/public/sync_manager.h"
     16 #include "sync/internal_api/public/util/weak_handle.h"
     17 #include "sync/syncable/transaction_observer.h"
     18 
     19 namespace tracked_objects {
     20 class Location;
     21 }  // namespace tracked_objects
     22 
     23 namespace syncer {
     24 
     25 class JsEventDetails;
     26 class JsEventHandler;
     27 
     28 // Observes all change- and transaction-related events and routes a
     29 // summarized version to a JsEventHandler.
     30 class SYNC_EXPORT_PRIVATE JsMutationEventObserver
     31     : public SyncManager::ChangeObserver,
     32       public syncable::TransactionObserver,
     33       public base::NonThreadSafe {
     34  public:
     35   JsMutationEventObserver();
     36 
     37   virtual ~JsMutationEventObserver();
     38 
     39   base::WeakPtr<JsMutationEventObserver> AsWeakPtr();
     40 
     41   void InvalidateWeakPtrs();
     42 
     43   void SetJsEventHandler(const WeakHandle<JsEventHandler>& event_handler);
     44 
     45   // SyncManager::ChangeObserver implementation.
     46   virtual void OnChangesApplied(
     47       ModelType model_type,
     48       int64 write_transaction_id,
     49       const ImmutableChangeRecordList& changes) OVERRIDE;
     50   virtual void OnChangesComplete(ModelType model_type) OVERRIDE;
     51 
     52   // syncable::TransactionObserver implementation.
     53   virtual void OnTransactionWrite(
     54       const syncable::ImmutableWriteTransactionInfo& write_transaction_info,
     55       ModelTypeSet models_with_changes) OVERRIDE;
     56 
     57  private:
     58   base::WeakPtrFactory<JsMutationEventObserver> weak_ptr_factory_;
     59   WeakHandle<JsEventHandler> event_handler_;
     60 
     61   void HandleJsEvent(
     62     const tracked_objects::Location& from_here,
     63     const std::string& name, const JsEventDetails& details);
     64 
     65   DISALLOW_COPY_AND_ASSIGN(JsMutationEventObserver);
     66 };
     67 
     68 }  // namespace syncer
     69 
     70 #endif  // SYNC_INTERNAL_API_JS_MUTATION_EVENT_OBSERVER_H_
     71