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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.
//
// An InvalidationStateTracker is an interface that handles persisting state
// needed for invalidations. Currently, it is responsible for managing the
// following information:
// - Max version seen from the invalidation server to help dedupe invalidations.
// - Bootstrap data for the invalidation client.
// - Payloads and locally generated ack handles, to support local acking.
#ifndef COMPONENTS_INVALIDATION_IMPL_INVALIDATION_STATE_TRACKER_H_
#define COMPONENTS_INVALIDATION_IMPL_INVALIDATION_STATE_TRACKER_H_
#include <map>
#include <string>
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "components/invalidation/impl/unacked_invalidation_set.h"
#include "components/invalidation/public/invalidation.h"
#include "components/invalidation/public/invalidation_export.h"
#include "components/invalidation/public/invalidation_util.h"
#include "google/cacheinvalidation/include/types.h"
namespace syncer {
class INVALIDATION_EXPORT InvalidationStateTracker {
public:
InvalidationStateTracker();
virtual ~InvalidationStateTracker();
// The per-client unique ID used to register the invalidation client with the
// server. This is used to squelch invalidation notifications that originate
// from changes made by this client. Setting the client ID clears all other
// state.
virtual void ClearAndSetNewClientId(const std::string& data) = 0;
virtual std::string GetInvalidatorClientId() const = 0;
// Used by invalidation::InvalidationClient for persistence. |data| is an
// opaque blob that an invalidation client can use after a restart to
// bootstrap itself. |data| is binary data (not valid UTF8, embedded nulls,
// etc).
virtual void SetBootstrapData(const std::string& data) = 0;
virtual std::string GetBootstrapData() const = 0;
// Used to store invalidations that have been acked to the server, but not yet
// handled by our clients. We store these invalidations on disk so we won't
// lose them if we need to restart.
virtual void SetSavedInvalidations(const UnackedInvalidationsMap& states) = 0;
virtual UnackedInvalidationsMap GetSavedInvalidations() const = 0;
// Erases invalidation versions, client ID, and state stored on disk.
virtual void Clear() = 0;
};
} // namespace syncer
#endif // COMPONENTS_INVALIDATION_IMPL_INVALIDATION_STATE_TRACKER_H_
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