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// 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.
//
// Interface to the invalidator, which is an object that receives
// invalidations for registered object IDs. The corresponding
// InvalidationHandler is notifier when such an event occurs.
#ifndef SYNC_NOTIFIER_INVALIDATOR_H_
#define SYNC_NOTIFIER_INVALIDATOR_H_
#include <string>
#include "sync/base/sync_export.h"
#include "sync/internal_api/public/base/model_type.h"
#include "sync/notifier/invalidation_util.h"
#include "sync/notifier/invalidator_state.h"
namespace syncer {
class InvalidationHandler;
class SYNC_EXPORT Invalidator {
public:
Invalidator() {}
virtual ~Invalidator() {}
// Clients should follow the pattern below:
//
// When starting the client:
//
// invalidator->RegisterHandler(client_handler);
//
// When the set of IDs to register changes for the client during its lifetime
// (i.e., between calls to RegisterHandler(client_handler) and
// UnregisterHandler(client_handler):
//
// invalidator->UpdateRegisteredIds(client_handler, client_ids);
//
// When shutting down the client for profile shutdown:
//
// invalidator->UnregisterHandler(client_handler);
//
// Note that there's no call to UpdateRegisteredIds() -- this is because the
// invalidation API persists registrations across browser restarts.
//
// When permanently shutting down the client, e.g. when disabling the related
// feature:
//
// invalidator->UpdateRegisteredIds(client_handler, ObjectIdSet());
// invalidator->UnregisterHandler(client_handler);
//
// It is an error to have registered handlers when an invalidator is
// destroyed; clients must ensure that they unregister themselves
// before then.
// Starts sending notifications to |handler|. |handler| must not be NULL,
// and it must not already be registered.
virtual void RegisterHandler(InvalidationHandler* handler) = 0;
// 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.
virtual void UpdateRegisteredIds(InvalidationHandler* handler,
const ObjectIdSet& ids) = 0;
// 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|.
virtual void UnregisterHandler(InvalidationHandler* handler) = 0;
// Returns the current invalidator state. When called from within
// InvalidationHandler::OnInvalidatorStateChange(), this must return
// the updated state.
virtual InvalidatorState GetInvalidatorState() const = 0;
// The observers won't be notified of any notifications until
// UpdateCredentials is called at least once. It can be called more than
// once.
virtual void UpdateCredentials(
const std::string& email, const std::string& token) = 0;
};
} // namespace syncer
#endif // SYNC_NOTIFIER_INVALIDATOR_H_
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