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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.
#ifndef COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_H_
#define COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_H_
#include <map>
#include <set>
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "components/invalidation/invalidation_util.h"
#include "components/invalidation/invalidator_state.h"
namespace base {
class DictionaryValue;
} // namespace base
namespace syncer {
class InvalidationHandler;
class ObjectIdInvalidationMap;
} // namespace syncer
namespace invalidation {
class InvalidationLoggerObserver;
// This class is in charge of logging invalidation-related information.
// It is used store the state of the InvalidatorService that owns this object
// and then rebroadcast it to observers than can display it accordingly
// (like a debugging page). This class only stores lightweight state, as in
// which services are registered and listening for certain objects, and the
// status of the InvalidatorService (in order not to increase unnecesary
// memory usage).
//
// Observers can be registered and will be called to be notified of any
// status change immediatly. They can log there the history of what messages
// they receive.
class InvalidationLogger {
public:
InvalidationLogger();
~InvalidationLogger();
// Pass through to any registered InvalidationLoggerObservers.
// We will do local logging here too.
void OnRegistration(const std::string& details);
void OnUnregistration(const std::string& details);
void OnStateChange(const syncer::InvalidatorState& new_state);
void OnUpdateIds(std::map<std::string, syncer::ObjectIdSet> updated_ids);
void OnDebugMessage(const base::DictionaryValue& details);
void OnInvalidation(const syncer::ObjectIdInvalidationMap& details);
// Triggers messages to be sent to the Observers to provide them with
// the current state of the logging.
void EmitContent();
// Add and remove observers listening for messages.
void RegisterObserver(InvalidationLoggerObserver* debug_observer);
void UnregisterObserver(InvalidationLoggerObserver* debug_observer);
bool IsObserverRegistered(
const InvalidationLoggerObserver* debug_observer) const;
private:
// Send to every Observer a OnStateChange event with the latest state.
void EmitState();
// Send to every Observer many OnUpdateIds events, each with one registrar
// and every objectId it currently has registered.
void EmitUpdatedIds();
// Send to every Observer a vector with the all the current registered
// handlers.
void EmitRegisteredHandlers();
// The list of every observer currently listening for notifications.
ObserverList<InvalidationLoggerObserver> observer_list_;
// The last InvalidatorState updated by the InvalidatorService.
syncer::InvalidatorState last_invalidator_state_;
base::Time last_invalidator_state_timestamp_;
// The map that contains every object id that is currently registered
// and its owner.
std::map<std::string, syncer::ObjectIdSet> latest_ids_;
// The map that counts how many invalidations per objectId there has been.
syncer::ObjectIdCountMap invalidation_count_;
// The name of all invalidatorHandler registered (note that this is not
// necessarily the same as the keys of latest_ids_, because they might
// have not registered any object id).
std::multiset<std::string> registered_handlers_;
DISALLOW_COPY_AND_ASSIGN(InvalidationLogger);
};
} // namespace invalidation
#endif // COMPONENTS_INVALIDATION_INVALIDATION_LOGGER_H_
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