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// 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.
#include <map>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "base/threading/thread_checker.h"
#include "components/invalidation/invalidation_export.h"
#include "sync/notifier/invalidation_handler.h"
#include "sync/notifier/invalidation_util.h"
namespace invalidation {
class ObjectId;
} // namespace invalidation
namespace syncer {
class ObjectIdInvalidationMap;
// A helper class for implementations of the Invalidator 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 INVALIDATION_EXPORT InvalidatorRegistrar {
// It is an error to have registered handlers on destruction.
// Starts sending notifications to |handler|. |handler| must not be NULL,
// and it must already be registered.
void RegisterHandler(InvalidationHandler* 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(InvalidationHandler* 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(InvalidationHandler* handler);
ObjectIdSet GetRegisteredIds(InvalidationHandler* handler) const;
// 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 ObjectIdInvalidationMap& invalidation_map);
// Updates the invalidator state to the given one and then notifies
// all handlers. Note that the order is important; handlers that
// call GetInvalidatorState() when notified will see the new state.
void UpdateInvalidatorState(InvalidatorState state);
// Returns the current invalidator state. When called from within
// InvalidationHandler::OnInvalidatorStateChange(), this returns the
// updated state.
InvalidatorState GetInvalidatorState() const;
// Gets a new map for the name of invalidator handlers and their
// objects id. This is used by the InvalidatorLogger to be able
// to display every registered handlers and its objectsIds.
std::map<std::string, ObjectIdSet> GetSanitizedHandlersIdsMap();
bool IsHandlerRegisteredForTest(InvalidationHandler* handler) const;
// Needed for death tests.
void DetachFromThreadForTest();
typedef std::map<InvalidationHandler*, ObjectIdSet> HandlerIdsMap;
base::ThreadChecker thread_checker_;
ObserverList<InvalidationHandler> handlers_;
HandlerIdsMap handler_to_ids_map_;
InvalidatorState state_;
} // namespace syncer