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// Copyright (c) 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.
#ifndef SYNC_NOTIFIER_SYNC_NOTIFIER_REGISTRAR_H_
#define SYNC_NOTIFIER_SYNC_NOTIFIER_REGISTRAR_H_
#include <map>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "base/threading/thread_checker.h"
#include "sync/notifier/invalidation_util.h"
#include "sync/notifier/object_id_state_map.h"
#include "sync/notifier/sync_notifier_observer.h"
namespace invalidation {
class ObjectId;
} // namespace invalidation
namespace syncer {
// A helper class for implementations of the SyncNotifier interface. It helps
// keep track of registered handlers and which object ID registrations are
// associated with which handlers, so implementors can just reuse the logic
// here to dispatch invalidations and other interesting notifications.
class SyncNotifierRegistrar {
public:
SyncNotifierRegistrar();
~SyncNotifierRegistrar();
// Starts sending notifications to |handler|. |handler| must not be NULL,
// and it must already be registered.
void RegisterHandler(SyncNotifierObserver* handler);
// Updates the set of ObjectIds associated with |handler|. |handler| must
// not be NULL, and must already be registered. An ID must be registered for
// at most one handler.
void UpdateRegisteredIds(SyncNotifierObserver* handler,
const ObjectIdSet& ids);
// Stops sending notifications to |handler|. |handler| must not be NULL, and
// it must already be registered. Note that this doesn't unregister the IDs
// associated with |handler|.
void UnregisterHandler(SyncNotifierObserver* handler);
// Returns the set of all IDs that are registered to some handler (even
// handlers that have been unregistered).
ObjectIdSet GetAllRegisteredIds() const;
// Sorts incoming invalidations into a bucket for each handler and then
// dispatches the batched invalidations to the corresponding handler.
// Invalidations for IDs with no corresponding handler are dropped, as are
// invalidations for handlers that are not added.
void DispatchInvalidationsToHandlers(const ObjectIdStateMap& id_state_map,
IncomingNotificationSource source);
// Calls the given handler method for each handler that has registered IDs.
void EmitOnNotificationsEnabled();
void EmitOnNotificationsDisabled(NotificationsDisabledReason reason);
// Needed for death tests.
void DetachFromThreadForTest();
private:
typedef std::map<invalidation::ObjectId, SyncNotifierObserver*,
ObjectIdLessThan>
IdHandlerMap;
SyncNotifierObserver* ObjectIdToHandler(const invalidation::ObjectId& id);
base::ThreadChecker thread_checker_;
ObserverList<SyncNotifierObserver> handlers_;
IdHandlerMap id_to_handler_map_;
DISALLOW_COPY_AND_ASSIGN(SyncNotifierRegistrar);
};
} // namespace syncer
#endif // SYNC_NOTIFIER_SYNC_NOTIFIER_REGISTRAR_H_
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