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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.
//
// An InvalidationVersionTracker is an interface that handles getting
// and setting (persisting) max invalidation versions.
#ifndef SYNC_NOTIFIER_INVALIDATION_STATE_TRACKER_H_
#define SYNC_NOTIFIER_INVALIDATION_STATE_TRACKER_H_
#include <map>
#include "base/basictypes.h"
#include "google/cacheinvalidation/include/types.h"
#include "sync/notifier/invalidation_util.h"
namespace syncer {
typedef std::map<invalidation::ObjectId, int64, ObjectIdLessThan>
InvalidationVersionMap;
class InvalidationStateTracker {
public:
InvalidationStateTracker() {}
virtual InvalidationVersionMap GetAllMaxVersions() const = 0;
// |max_version| should be strictly greater than any existing max
// version for |model_type|.
virtual void SetMaxVersion(const invalidation::ObjectId& id,
int64 max_version) = 0;
// Used by InvalidationClient for persistence. |state| is opaque data we can
// present back to the client (e.g. after a restart) for it to bootstrap
// itself.
// |state| is plain old data (not valid UTF8, embedded nulls, etc).
virtual void SetInvalidationState(const std::string& state) = 0;
virtual std::string GetInvalidationState() const = 0;
protected:
virtual ~InvalidationStateTracker() {}
};
} // namespace syncer
#endif // SYNC_NOTIFIER_INVALIDATION_STATE_TRACKER_H_