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/*
* Copyright (C) 2019, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <utils/RefBase.h>
#include "HashableDimensionKey.h"
#include "logd/LogEvent.h"
#include "state/StateListener.h"
#include <unordered_map>
namespace android {
namespace os {
namespace statsd {
class StateTracker : public virtual RefBase {
public:
StateTracker(const int32_t atomId);
virtual ~StateTracker(){};
// Updates state map and notifies all listeners if a state change occurs.
// Checks if a state change has occurred by getting the state value from
// the log event and comparing the old and new states.
void onLogEvent(const LogEvent& event);
// Adds new listeners to set of StateListeners. If a listener is already
// registered, it is ignored.
void registerListener(wp<StateListener> listener);
void unregisterListener(wp<StateListener> listener);
// The output is a FieldValue object that has mStateField as the field and
// the original state value (found using the given query key) as the value.
//
// If the key isn't mapped to a state or the key size doesn't match the
// number of primary fields, the output value is set to kStateUnknown.
bool getStateValue(const HashableDimensionKey& queryKey, FieldValue* output) const;
inline int getListenersCount() const {
return mListeners.size();
}
const static int kStateUnknown = -1;
private:
struct StateValueInfo {
int32_t state = kStateUnknown; // state value
int count = 0; // nested count (only used for binary states)
};
Field mField;
// Maps primary key to state value info
std::unordered_map<HashableDimensionKey, StateValueInfo> mStateMap;
// Set of all StateListeners (objects listening for state changes)
std::set<wp<StateListener>> mListeners;
// Reset all state values in map to the given state.
void handleReset(const int64_t eventTimeNs, const FieldValue& newState);
// Clears the state value mapped to the given primary key by setting it to kStateUnknown.
void clearStateForPrimaryKey(const int64_t eventTimeNs, const HashableDimensionKey& primaryKey);
// Update the StateMap based on the received state value.
void updateStateForPrimaryKey(const int64_t eventTimeNs, const HashableDimensionKey& primaryKey,
const FieldValue& newState, const bool nested,
StateValueInfo* stateValueInfo);
// Notify registered state listeners of state change.
void notifyListeners(const int64_t eventTimeNs, const HashableDimensionKey& primaryKey,
const FieldValue& oldState, const FieldValue& newState);
};
bool getStateFieldValueFromLogEvent(const LogEvent& event, FieldValue* output);
} // namespace statsd
} // namespace os
} // namespace android
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