cmds/statsd/src/condition/SimpleConditionTracker.h

/*
 * Copyright (C) 2017 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.
 */

#ifndef SIMPLE_CONDITION_TRACKER_H
#define SIMPLE_CONDITION_TRACKER_H

#include "ConditionTracker.h"
#include "frameworks/base/cmds/statsd/src/statsd_config.pb.h"
#include "stats_util.h"

namespace android {
namespace os {
namespace statsd {

class SimpleConditionTracker : public virtual ConditionTracker {
public:
    // dimensions is a vector of vector because for one single condition, different metrics may be
    // interested in slicing in different ways. one vector<KeyMatcher> defines one type of slicing.
    SimpleConditionTracker(const std::string& name, const int index,
                           const SimpleCondition& simpleCondition,
                           const std::unordered_map<std::string, int>& trackerNameIndexMap);

    ~SimpleConditionTracker();

    bool init(const std::vector<Condition>& allConditionConfig,
              const std::vector<sp<ConditionTracker>>& allConditionTrackers,
              const std::unordered_map<std::string, int>& conditionNameIndexMap,
              std::vector<bool>& stack) override;

    bool evaluateCondition(const LogEvent& event,
                           const std::vector<MatchingState>& eventMatcherValues,
                           const std::vector<sp<ConditionTracker>>& mAllConditions,
                           std::vector<ConditionState>& conditionCache,
                           std::vector<bool>& changedCache,
                           std::vector<bool>& slicedChangedCache) override;

    void isConditionMet(const std::map<std::string, HashableDimensionKey>& conditionParameters,
                        const std::vector<sp<ConditionTracker>>& allConditions,
                        std::vector<ConditionState>& conditionCache) override;

    void addDimensions(const std::vector<KeyMatcher>& keyMatchers) override;

private:
    // The index of the LogEventMatcher which defines the start.
    int mStartLogMatcherIndex;

    // The index of the LogEventMatcher which defines the end.
    int mStopLogMatcherIndex;

    // if the start end needs to be nested.
    bool mCountNesting;

    // The index of the LogEventMatcher which defines the stop all.
    int mStopAllLogMatcherIndex;

    // Different metrics may subscribe to different types of slicings. So it's a vector of vector.
    std::vector<std::vector<KeyMatcher>> mDimensionsList;

    // Keep the map from the internal HashableDimensionKey to std::vector<KeyValuePair>
    // that StatsLogReport wants.
    std::unordered_map<HashableDimensionKey, ConditionState> mSlicedConditionState;
};

}  // namespace statsd
}  // namespace os
}  // namespace android

#endif  // SIMPLE_CONDITION_TRACKER_H