cmds/statsd/src/metrics/MetricProducer.cpp - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * 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.
  */

 #define DEBUG false  // STOPSHIP if true
 #include "Log.h"

 #include "MetricProducer.h"

 #include "../guardrail/StatsdStats.h"
 #include "state/StateTracker.h"

 using android::util::FIELD_COUNT_REPEATED;
 using android::util::FIELD_TYPE_ENUM;
 using android::util::FIELD_TYPE_INT32;
 using android::util::FIELD_TYPE_INT64;
 using android::util::FIELD_TYPE_MESSAGE;
 using android::util::ProtoOutputStream;

 namespace android {
 namespace os {
 namespace statsd {


 // for ActiveMetric
 const int FIELD_ID_ACTIVE_METRIC_ID = 1;
 const int FIELD_ID_ACTIVE_METRIC_ACTIVATION = 2;

 // for ActiveEventActivation
 const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_ATOM_MATCHER_INDEX = 1;
 const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS = 2;
 const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE = 3;

 MetricProducer::MetricProducer(
         const int64_t& metricId, const ConfigKey& key, const int64_t timeBaseNs,
         const int conditionIndex, const sp<ConditionWizard>& wizard,
         const std::unordered_map<int, std::shared_ptr<Activation>>& eventActivationMap,
         const std::unordered_map<int, std::vector<std::shared_ptr<Activation>>>&
                 eventDeactivationMap,
         const vector<int>& slicedStateAtoms,
         const unordered_map<int, unordered_map<int, int64_t>>& stateGroupMap)
     : mMetricId(metricId),
       mConfigKey(key),
       mTimeBaseNs(timeBaseNs),
       mCurrentBucketStartTimeNs(timeBaseNs),
       mCurrentBucketNum(0),
       mCondition(initialCondition(conditionIndex)),
       mConditionTrackerIndex(conditionIndex),
       mConditionSliced(false),
       mWizard(wizard),
       mContainANYPositionInDimensionsInWhat(false),
       mSliceByPositionALL(false),
       mHasLinksToAllConditionDimensionsInTracker(false),
       mEventActivationMap(eventActivationMap),
       mEventDeactivationMap(eventDeactivationMap),
       mIsActive(mEventActivationMap.empty()),
       mSlicedStateAtoms(slicedStateAtoms),
       mStateGroupMap(stateGroupMap) {
 }

 void MetricProducer::onMatchedLogEventLocked(const size_t matcherIndex, const LogEvent& event) {
     if (!mIsActive) {
         return;
     }
     int64_t eventTimeNs = event.GetElapsedTimestampNs();
     // this is old event, maybe statsd restarted?
     if (eventTimeNs < mTimeBaseNs) {
         return;
     }

     bool condition;
     ConditionKey conditionKey;
     if (mConditionSliced) {
         for (const auto& link : mMetric2ConditionLinks) {
             getDimensionForCondition(event.getValues(), link, &conditionKey[link.conditionId]);
         }
         auto conditionState =
             mWizard->query(mConditionTrackerIndex, conditionKey,
                            !mHasLinksToAllConditionDimensionsInTracker);
         condition = (conditionState == ConditionState::kTrue);
     } else {
         // TODO: The unknown condition state is not handled here, we should fix it.
         condition = mCondition == ConditionState::kTrue;
     }

     // Stores atom id to primary key pairs for each state atom that the metric is
     // sliced by.
     std::map<int, HashableDimensionKey> statePrimaryKeys;

     // For states with primary fields, use MetricStateLinks to get the primary
     // field values from the log event. These values will form a primary key
     // that will be used to query StateTracker for the correct state value.
     for (const auto& stateLink : mMetric2StateLinks) {
         getDimensionForState(event.getValues(), stateLink,
                              &statePrimaryKeys[stateLink.stateAtomId]);
     }

     // For each sliced state, query StateTracker for the state value using
     // either the primary key from the previous step or the DEFAULT_DIMENSION_KEY.
     //
     // Expected functionality: for any case where the MetricStateLinks are
     // initialized incorrectly (ex. # of state links != # of primary fields, no
     // links are provided for a state with primary fields, links are provided
     // in the wrong order, etc.), StateTracker will simply return kStateUnknown
     // when queried using an incorrect key.
     HashableDimensionKey stateValuesKey;
     for (auto atomId : mSlicedStateAtoms) {
         FieldValue value;
         if (statePrimaryKeys.find(atomId) != statePrimaryKeys.end()) {
             // found a primary key for this state, query using the key
             getMappedStateValue(atomId, statePrimaryKeys[atomId], &value);
         } else {
             // if no MetricStateLinks exist for this state atom,
             // query using the default dimension key (empty HashableDimensionKey)
             getMappedStateValue(atomId, DEFAULT_DIMENSION_KEY, &value);
         }
         stateValuesKey.addValue(value);
     }

     HashableDimensionKey dimensionInWhat;
     filterValues(mDimensionsInWhat, event.getValues(), &dimensionInWhat);
     MetricDimensionKey metricKey(dimensionInWhat, stateValuesKey);
     onMatchedLogEventInternalLocked(matcherIndex, metricKey, conditionKey, condition, event,
                                     statePrimaryKeys);
 }

 bool MetricProducer::evaluateActiveStateLocked(int64_t elapsedTimestampNs) {
     bool isActive = mEventActivationMap.empty();
     for (auto& it : mEventActivationMap) {
         if (it.second->state == ActivationState::kActive &&
             elapsedTimestampNs > it.second->ttl_ns + it.second->start_ns) {
             it.second->state = ActivationState::kNotActive;
         }
         if (it.second->state == ActivationState::kActive) {
             isActive = true;
         }
     }
     return isActive;
 }

 void MetricProducer::flushIfExpire(int64_t elapsedTimestampNs) {
     std::lock_guard<std::mutex> lock(mMutex);
     if (!mIsActive) {
         return;
     }
     mIsActive = evaluateActiveStateLocked(elapsedTimestampNs);
     if (!mIsActive) {
         onActiveStateChangedLocked(elapsedTimestampNs);
     }
 }

 void MetricProducer::activateLocked(int activationTrackerIndex, int64_t elapsedTimestampNs) {
     auto it = mEventActivationMap.find(activationTrackerIndex);
     if (it == mEventActivationMap.end()) {
         return;
     }
     auto& activation = it->second;
     if (ACTIVATE_ON_BOOT == activation->activationType) {
         if (ActivationState::kNotActive == activation->state) {
             activation->state = ActivationState::kActiveOnBoot;
         }
         // If the Activation is already active or set to kActiveOnBoot, do nothing.
         return;
     }
     activation->start_ns = elapsedTimestampNs;
     activation->state = ActivationState::kActive;
     bool oldActiveState = mIsActive;
     mIsActive = true;
     if (!oldActiveState) { // Metric went from not active to active.
         onActiveStateChangedLocked(elapsedTimestampNs);
     }
 }

 void MetricProducer::cancelEventActivationLocked(int deactivationTrackerIndex) {
     auto it = mEventDeactivationMap.find(deactivationTrackerIndex);
     if (it == mEventDeactivationMap.end()) {
         return;
     }
     for (auto activationToCancelIt : it->second)  {
         activationToCancelIt->state = ActivationState::kNotActive;
     }
 }

 void MetricProducer::loadActiveMetricLocked(const ActiveMetric& activeMetric,
                                             int64_t currentTimeNs) {
     if (mEventActivationMap.size() == 0) {
         return;
     }
     for (int i = 0; i < activeMetric.activation_size(); i++) {
         const auto& activeEventActivation = activeMetric.activation(i);
         auto it = mEventActivationMap.find(activeEventActivation.atom_matcher_index());
         if (it == mEventActivationMap.end()) {
             ALOGE("Saved event activation not found");
             continue;
         }
         auto& activation = it->second;
         // If the event activation does not have a state, assume it is active.
         if (!activeEventActivation.has_state() ||
                 activeEventActivation.state() == ActiveEventActivation::ACTIVE) {
             // We don't want to change the ttl for future activations, so we set the start_ns
             // such that start_ns + ttl_ns == currentTimeNs + remaining_ttl_nanos
             activation->start_ns =
                 currentTimeNs + activeEventActivation.remaining_ttl_nanos() - activation->ttl_ns;
             activation->state = ActivationState::kActive;
             mIsActive = true;
         } else if (activeEventActivation.state() == ActiveEventActivation::ACTIVATE_ON_BOOT) {
             activation->state = ActivationState::kActiveOnBoot;
         }
     }
 }

 void MetricProducer::writeActiveMetricToProtoOutputStream(
         int64_t currentTimeNs, const DumpReportReason reason, ProtoOutputStream* proto) {
     proto->write(FIELD_TYPE_INT64 | FIELD_ID_ACTIVE_METRIC_ID, (long long)mMetricId);
     for (auto& it : mEventActivationMap) {
         const int atom_matcher_index = it.first;
         const std::shared_ptr<Activation>& activation = it.second;

         if (ActivationState::kNotActive == activation->state ||
                 (ActivationState::kActive == activation->state &&
                  activation->start_ns + activation->ttl_ns < currentTimeNs)) {
             continue;
         }

         const uint64_t activationToken = proto->start(FIELD_TYPE_MESSAGE | FIELD_COUNT_REPEATED |
                 FIELD_ID_ACTIVE_METRIC_ACTIVATION);
         proto->write(FIELD_TYPE_INT32 | FIELD_ID_ACTIVE_EVENT_ACTIVATION_ATOM_MATCHER_INDEX,
                 atom_matcher_index);
         if (ActivationState::kActive == activation->state) {
             const int64_t remainingTtlNs =
                     activation->start_ns + activation->ttl_ns - currentTimeNs;
             proto->write(FIELD_TYPE_INT64 | FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS,
                     (long long)remainingTtlNs);
             proto->write(FIELD_TYPE_ENUM | FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
                     ActiveEventActivation::ACTIVE);

         } else if (ActivationState::kActiveOnBoot == activation->state) {
             if (reason == DEVICE_SHUTDOWN || reason == TERMINATION_SIGNAL_RECEIVED) {
                 proto->write(
                         FIELD_TYPE_INT64 | FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS,
                         (long long)activation->ttl_ns);
                 proto->write(FIELD_TYPE_ENUM | FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
                                     ActiveEventActivation::ACTIVE);
             } else if (reason == STATSCOMPANION_DIED) {
                 // We are saving because of system server death, not due to a device shutdown.
                 // Next time we load, we do not want to activate metrics that activate on boot.
                 proto->write(FIELD_TYPE_ENUM | FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
                                                     ActiveEventActivation::ACTIVATE_ON_BOOT);
             }
         }
         proto->end(activationToken);
     }
 }

 void MetricProducer::getMappedStateValue(const int32_t atomId, const HashableDimensionKey& queryKey,
                                          FieldValue* value) {
     if (!StateManager::getInstance().getStateValue(atomId, queryKey, value)) {
         value->mValue = Value(StateTracker::kStateUnknown);
         value->mField.setTag(atomId);
         ALOGW("StateTracker not found for state atom %d", atomId);
         return;
     }

     // check if there is a state map for this atom
     auto atomIt = mStateGroupMap.find(atomId);
     if (atomIt == mStateGroupMap.end()) {
         return;
     }
     auto valueIt = atomIt->second.find(value->mValue.int_value);
     if (valueIt == atomIt->second.end()) {
         // state map exists, but value was not put in a state group
         // so set mValue to kStateUnknown
         // TODO(tsaichristine): handle incomplete state maps
         value->mValue.setInt(StateTracker::kStateUnknown);
     } else {
         // set mValue to group_id
         value->mValue.setLong(valueIt->second);
     }
 }

 DropEvent MetricProducer::buildDropEvent(const int64_t dropTimeNs, const BucketDropReason reason) {
     DropEvent event;
     event.reason = reason;
     event.dropTimeNs = dropTimeNs;
     return event;
 }

 bool MetricProducer::maxDropEventsReached() {
     return mCurrentSkippedBucket.dropEvents.size() >= StatsdStats::kMaxLoggedBucketDropEvents;
 }

 }  // namespace statsd
 }  // namespace os
 }  // namespace android
	/*
	* 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.
	*/

	#define DEBUG false // STOPSHIP if true
	#include "Log.h"

	#include "MetricProducer.h"

	#include "../guardrail/StatsdStats.h"
	#include "state/StateTracker.h"

	using android::util::FIELD_COUNT_REPEATED;
	using android::util::FIELD_TYPE_ENUM;
	using android::util::FIELD_TYPE_INT32;
	using android::util::FIELD_TYPE_INT64;
	using android::util::FIELD_TYPE_MESSAGE;
	using android::util::ProtoOutputStream;

	namespace android {
	namespace os {
	namespace statsd {


	// for ActiveMetric
	const int FIELD_ID_ACTIVE_METRIC_ID = 1;
	const int FIELD_ID_ACTIVE_METRIC_ACTIVATION = 2;

	// for ActiveEventActivation
	const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_ATOM_MATCHER_INDEX = 1;
	const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS = 2;
	const int FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE = 3;

	MetricProducer::MetricProducer(
	const int64_t& metricId, const ConfigKey& key, const int64_t timeBaseNs,
	const int conditionIndex, const sp<ConditionWizard>& wizard,
	const std::unordered_map<int, std::shared_ptr<Activation>>& eventActivationMap,
	const std::unordered_map<int, std::vector<std::shared_ptr<Activation>>>&
	eventDeactivationMap,
	const vector<int>& slicedStateAtoms,
	const unordered_map<int, unordered_map<int, int64_t>>& stateGroupMap)
	: mMetricId(metricId),
	mConfigKey(key),
	mTimeBaseNs(timeBaseNs),
	mCurrentBucketStartTimeNs(timeBaseNs),
	mCurrentBucketNum(0),
	mCondition(initialCondition(conditionIndex)),
	mConditionTrackerIndex(conditionIndex),
	mConditionSliced(false),
	mWizard(wizard),
	mContainANYPositionInDimensionsInWhat(false),
	mSliceByPositionALL(false),
	mHasLinksToAllConditionDimensionsInTracker(false),
	mEventActivationMap(eventActivationMap),
	mEventDeactivationMap(eventDeactivationMap),
	mIsActive(mEventActivationMap.empty()),
	mSlicedStateAtoms(slicedStateAtoms),
	mStateGroupMap(stateGroupMap) {
	}

	void MetricProducer::onMatchedLogEventLocked(const size_t matcherIndex, const LogEvent& event) {
	if (!mIsActive) {
	return;
	}
	int64_t eventTimeNs = event.GetElapsedTimestampNs();
	// this is old event, maybe statsd restarted?
	if (eventTimeNs < mTimeBaseNs) {
	return;
	}

	bool condition;
	ConditionKey conditionKey;
	if (mConditionSliced) {
	for (const auto& link : mMetric2ConditionLinks) {
	getDimensionForCondition(event.getValues(), link, &conditionKey[link.conditionId]);
	}
	auto conditionState =
	mWizard->query(mConditionTrackerIndex, conditionKey,
	!mHasLinksToAllConditionDimensionsInTracker);
	condition = (conditionState == ConditionState::kTrue);
	} else {
	// TODO: The unknown condition state is not handled here, we should fix it.
	condition = mCondition == ConditionState::kTrue;
	}

	// Stores atom id to primary key pairs for each state atom that the metric is
	// sliced by.
	std::map<int, HashableDimensionKey> statePrimaryKeys;

	// For states with primary fields, use MetricStateLinks to get the primary
	// field values from the log event. These values will form a primary key
	// that will be used to query StateTracker for the correct state value.
	for (const auto& stateLink : mMetric2StateLinks) {
	getDimensionForState(event.getValues(), stateLink,
	&statePrimaryKeys[stateLink.stateAtomId]);
	}

	// For each sliced state, query StateTracker for the state value using
	// either the primary key from the previous step or the DEFAULT_DIMENSION_KEY.
	//
	// Expected functionality: for any case where the MetricStateLinks are
	// initialized incorrectly (ex. # of state links != # of primary fields, no
	// links are provided for a state with primary fields, links are provided
	// in the wrong order, etc.), StateTracker will simply return kStateUnknown
	// when queried using an incorrect key.
	HashableDimensionKey stateValuesKey;
	for (auto atomId : mSlicedStateAtoms) {
	FieldValue value;
	if (statePrimaryKeys.find(atomId) != statePrimaryKeys.end()) {
	// found a primary key for this state, query using the key
	getMappedStateValue(atomId, statePrimaryKeys[atomId], &value);
	} else {
	// if no MetricStateLinks exist for this state atom,
	// query using the default dimension key (empty HashableDimensionKey)
	getMappedStateValue(atomId, DEFAULT_DIMENSION_KEY, &value);
	}
	stateValuesKey.addValue(value);
	}

	HashableDimensionKey dimensionInWhat;
	filterValues(mDimensionsInWhat, event.getValues(), &dimensionInWhat);
	MetricDimensionKey metricKey(dimensionInWhat, stateValuesKey);
	onMatchedLogEventInternalLocked(matcherIndex, metricKey, conditionKey, condition, event,
	statePrimaryKeys);
	}

	bool MetricProducer::evaluateActiveStateLocked(int64_t elapsedTimestampNs) {
	bool isActive = mEventActivationMap.empty();
	for (auto& it : mEventActivationMap) {
	if (it.second->state == ActivationState::kActive &&
	elapsedTimestampNs > it.second->ttl_ns + it.second->start_ns) {
	it.second->state = ActivationState::kNotActive;
	}
	if (it.second->state == ActivationState::kActive) {
	isActive = true;
	}
	}
	return isActive;
	}

	void MetricProducer::flushIfExpire(int64_t elapsedTimestampNs) {
	std::lock_guard<std::mutex> lock(mMutex);
	if (!mIsActive) {
	return;
	}
	mIsActive = evaluateActiveStateLocked(elapsedTimestampNs);
	if (!mIsActive) {
	onActiveStateChangedLocked(elapsedTimestampNs);
	}
	}

	void MetricProducer::activateLocked(int activationTrackerIndex, int64_t elapsedTimestampNs) {
	auto it = mEventActivationMap.find(activationTrackerIndex);
	if (it == mEventActivationMap.end()) {
	return;
	}
	auto& activation = it->second;
	if (ACTIVATE_ON_BOOT == activation->activationType) {
	if (ActivationState::kNotActive == activation->state) {
	activation->state = ActivationState::kActiveOnBoot;
	}
	// If the Activation is already active or set to kActiveOnBoot, do nothing.
	return;
	}
	activation->start_ns = elapsedTimestampNs;
	activation->state = ActivationState::kActive;
	bool oldActiveState = mIsActive;
	mIsActive = true;
	if (!oldActiveState) { // Metric went from not active to active.
	onActiveStateChangedLocked(elapsedTimestampNs);
	}
	}

	void MetricProducer::cancelEventActivationLocked(int deactivationTrackerIndex) {
	auto it = mEventDeactivationMap.find(deactivationTrackerIndex);
	if (it == mEventDeactivationMap.end()) {
	return;
	}
	for (auto activationToCancelIt : it->second) {
	activationToCancelIt->state = ActivationState::kNotActive;
	}
	}

	void MetricProducer::loadActiveMetricLocked(const ActiveMetric& activeMetric,
	int64_t currentTimeNs) {
	if (mEventActivationMap.size() == 0) {
	return;
	}
	for (int i = 0; i < activeMetric.activation_size(); i++) {
	const auto& activeEventActivation = activeMetric.activation(i);
	auto it = mEventActivationMap.find(activeEventActivation.atom_matcher_index());
	if (it == mEventActivationMap.end()) {
	ALOGE("Saved event activation not found");
	continue;
	}
	auto& activation = it->second;
	// If the event activation does not have a state, assume it is active.
	if (!activeEventActivation.has_state() \|\|
	activeEventActivation.state() == ActiveEventActivation::ACTIVE) {
	// We don't want to change the ttl for future activations, so we set the start_ns
	// such that start_ns + ttl_ns == currentTimeNs + remaining_ttl_nanos
	activation->start_ns =
	currentTimeNs + activeEventActivation.remaining_ttl_nanos() - activation->ttl_ns;
	activation->state = ActivationState::kActive;
	mIsActive = true;
	} else if (activeEventActivation.state() == ActiveEventActivation::ACTIVATE_ON_BOOT) {
	activation->state = ActivationState::kActiveOnBoot;
	}
	}
	}

	void MetricProducer::writeActiveMetricToProtoOutputStream(
	int64_t currentTimeNs, const DumpReportReason reason, ProtoOutputStream* proto) {
	proto->write(FIELD_TYPE_INT64 \| FIELD_ID_ACTIVE_METRIC_ID, (long long)mMetricId);
	for (auto& it : mEventActivationMap) {
	const int atom_matcher_index = it.first;
	const std::shared_ptr<Activation>& activation = it.second;

	if (ActivationState::kNotActive == activation->state \|\|
	(ActivationState::kActive == activation->state &&
	activation->start_ns + activation->ttl_ns < currentTimeNs)) {
	continue;
	}

	const uint64_t activationToken = proto->start(FIELD_TYPE_MESSAGE \| FIELD_COUNT_REPEATED \|
	FIELD_ID_ACTIVE_METRIC_ACTIVATION);
	proto->write(FIELD_TYPE_INT32 \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_ATOM_MATCHER_INDEX,
	atom_matcher_index);
	if (ActivationState::kActive == activation->state) {
	const int64_t remainingTtlNs =
	activation->start_ns + activation->ttl_ns - currentTimeNs;
	proto->write(FIELD_TYPE_INT64 \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS,
	(long long)remainingTtlNs);
	proto->write(FIELD_TYPE_ENUM \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
	ActiveEventActivation::ACTIVE);

	} else if (ActivationState::kActiveOnBoot == activation->state) {
	if (reason == DEVICE_SHUTDOWN \|\| reason == TERMINATION_SIGNAL_RECEIVED) {
	proto->write(
	FIELD_TYPE_INT64 \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_REMAINING_TTL_NANOS,
	(long long)activation->ttl_ns);
	proto->write(FIELD_TYPE_ENUM \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
	ActiveEventActivation::ACTIVE);
	} else if (reason == STATSCOMPANION_DIED) {
	// We are saving because of system server death, not due to a device shutdown.
	// Next time we load, we do not want to activate metrics that activate on boot.
	proto->write(FIELD_TYPE_ENUM \| FIELD_ID_ACTIVE_EVENT_ACTIVATION_STATE,
	ActiveEventActivation::ACTIVATE_ON_BOOT);
	}
	}
	proto->end(activationToken);
	}
	}

	void MetricProducer::getMappedStateValue(const int32_t atomId, const HashableDimensionKey& queryKey,
	FieldValue* value) {
	if (!StateManager::getInstance().getStateValue(atomId, queryKey, value)) {
	value->mValue = Value(StateTracker::kStateUnknown);
	value->mField.setTag(atomId);
	ALOGW("StateTracker not found for state atom %d", atomId);
	return;
	}

	// check if there is a state map for this atom
	auto atomIt = mStateGroupMap.find(atomId);
	if (atomIt == mStateGroupMap.end()) {
	return;
	}
	auto valueIt = atomIt->second.find(value->mValue.int_value);
	if (valueIt == atomIt->second.end()) {
	// state map exists, but value was not put in a state group
	// so set mValue to kStateUnknown
	// TODO(tsaichristine): handle incomplete state maps
	value->mValue.setInt(StateTracker::kStateUnknown);
	} else {
	// set mValue to group_id
	value->mValue.setLong(valueIt->second);
	}
	}

	DropEvent MetricProducer::buildDropEvent(const int64_t dropTimeNs, const BucketDropReason reason) {
	DropEvent event;
	event.reason = reason;
	event.dropTimeNs = dropTimeNs;
	return event;
	}

	bool MetricProducer::maxDropEventsReached() {
	return mCurrentSkippedBucket.dropEvents.size() >= StatsdStats::kMaxLoggedBucketDropEvents;
	}

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