core/sensor_request_manager.cc - platform/system/chre - Git at Google

 /*
  * Copyright (C) 2016 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.
  */

 #include "chre/core/sensor_request_manager.h"

 #include "chre/core/event_loop_manager.h"
 #include "chre/platform/fatal_error.h"
 #include "chre_api/chre/version.h"

 namespace chre {
 namespace {

 bool isSensorRequestValid(const Sensor& sensor,
                           const SensorRequest& sensorRequest) {
   bool isRequestContinuous = sensorModeIsContinuous(
       sensorRequest.getMode());
   bool isRequestOneShot = sensorModeIsOneShot(sensorRequest.getMode());
   uint64_t requestedInterval = sensorRequest.getInterval().toRawNanoseconds();
   uint64_t requestedLatency = sensorRequest.getLatency().toRawNanoseconds();
   SensorType sensorType = sensor.getSensorType();

   bool success = true;
   if (isRequestContinuous) {
     if (sensorTypeIsOneShot(sensorType)) {
       success = false;
       LOGE("Invalid continuous request for a one-shot sensor.");
     } else if (requestedInterval < sensor.getMinInterval()) {
       success = false;
       LOGE("Invalid requested interval %" PRIu64 " for a continuous sensor"
            " with minInterval %" PRIu64,
            requestedInterval, sensor.getMinInterval());
     }
   } else if (isRequestOneShot) {
     if (!sensorTypeIsOneShot(sensorType)) {
       success = false;
       LOGE("Invalid one-shot request for a continuous sensor.");
     } else if (requestedInterval != CHRE_SENSOR_INTERVAL_DEFAULT ||
                requestedLatency != CHRE_SENSOR_LATENCY_DEFAULT) {
       success = false;
       LOGE("Invalid interval and/or latency for a one-shot request.");
     }
   }
   return success;
 }

 }  // namespace

 SensorRequestManager::SensorRequestManager() {
   mSensorRequests.resize(mSensorRequests.capacity());

   DynamicVector<PlatformSensor> platformSensors;
   if (!PlatformSensor::getSensors(&platformSensors)) {
     LOGE("Failed to query the platform for sensors");
     return;
   }

   if (platformSensors.empty()) {
     LOGW("Platform returned zero sensors");
   }

   for (size_t i = 0; i < platformSensors.size(); i++) {
     SensorType sensorType = platformSensors[i].getSensorType();
     size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
     LOGD("Found sensor: %s", getSensorTypeName(sensorType));

     mSensorRequests[sensorIndex].sensor =
         Sensor(std::move(platformSensors[i]));
   }
 }

 SensorRequestManager::~SensorRequestManager() {
   SensorRequest nullRequest = SensorRequest();
   for (size_t i = 0; i < mSensorRequests.size(); i++) {
     // Disable sensors that have been enabled previously.
     Sensor& sensor = mSensorRequests[i].sensor;
     sensor.setRequest(nullRequest);
   }
 }

 bool SensorRequestManager::getSensorHandle(SensorType sensorType,
                                            uint32_t *sensorHandle) const {
   CHRE_ASSERT(sensorHandle);

   bool sensorHandleIsValid = false;
   if (sensorType == SensorType::Unknown) {
     LOGW("Querying for unknown sensor type");
   } else {
     size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
     sensorHandleIsValid = mSensorRequests[sensorIndex].sensor.isValid();
     if (sensorHandleIsValid) {
       *sensorHandle = getSensorHandleFromSensorType(sensorType);
     }
   }

   return sensorHandleIsValid;
 }

 bool SensorRequestManager::setSensorRequest(Nanoapp *nanoapp,
     uint32_t sensorHandle, const SensorRequest& sensorRequest) {
   CHRE_ASSERT(nanoapp);

   // Validate the input to ensure that a valid handle has been provided.
   SensorType sensorType = getSensorTypeFromSensorHandle(sensorHandle);
   if (sensorType == SensorType::Unknown) {
     LOGW("Attempting to configure an invalid handle");
     return false;
   }

   // Ensure that the runtime is aware of this sensor type.
   size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
   SensorRequests& requests = mSensorRequests[sensorIndex];
   const Sensor& sensor = requests.sensor;

   if (!sensor.isValid()) {
     LOGW("Attempting to configure non-existent sensor");
     return false;
   } else if (!isSensorRequestValid(sensor, sensorRequest)) {
     return false;
   }

   size_t requestIndex;
   uint16_t eventType = getSampleEventTypeForSensorType(sensorType);
   bool nanoappHasRequest = (requests.find(nanoapp, &requestIndex) != nullptr);

   bool success;
   bool requestChanged;
   if (sensorRequest.getMode() == SensorMode::Off) {
     if (nanoappHasRequest) {
       // The request changes the mode to off and there was an existing request.
       // The existing request is removed from the multiplexer. The nanoapp is
       // unregistered from events of this type if this request was successful.
       success = requests.remove(requestIndex, &requestChanged);
       if (success) {
         nanoapp->unregisterForBroadcastEvent(eventType);
       }
     } else {
       // The sensor is being configured to Off, but is already Off (there is no
       // existing request). We assign to success to be true and no other
       // operation is required.
       requestChanged = false;
       success = true;
     }
   } else if (!nanoappHasRequest) {
     // The request changes the mode to the enabled state and there was no
     // existing request. The request is newly created and added to the
     // multiplexer. The nanoapp is registered for events if this request was
     // successful.
     success = requests.add(sensorRequest, &requestChanged);
     if (success) {
       nanoapp->registerForBroadcastEvent(eventType);

       // Deliver last valid event to new clients of on-change sensors
       if (sensorTypeIsOnChange(sensor.getSensorType())
           && sensor.getLastEvent() != nullptr) {
         EventLoopManagerSingleton::get()->postEvent(
             getSampleEventTypeForSensorType(sensorType), sensor.getLastEvent(),
             nullptr, kSystemInstanceId, nanoapp->getInstanceId());
       }
     }
   } else {
     // The request changes the mode to the enabled state and there was an
     // existing request. The existing request is updated.
     success = requests.update(requestIndex, sensorRequest, &requestChanged);
   }

   if (requestChanged) {
     // TODO: Send an event to nanoapps to indicate the rate change.
   }

   return success;
 }

 bool SensorRequestManager::getSensorInfo(uint32_t sensorHandle,
                                          const Nanoapp *nanoapp,
                                          struct chreSensorInfo *info) const {
   CHRE_ASSERT(nanoapp);
   CHRE_ASSERT(info);

   bool success = false;

   // Validate the input to ensure that a valid handle has been provided.
   SensorType sensorType = getSensorTypeFromSensorHandle(sensorHandle);
   if (sensorType == SensorType::Unknown) {
     LOGW("Attempting to access sensor with an invalid handle %" PRIu32,
          sensorHandle);
   } else {
     success = true;

     // Platform-independent properties.
     info->sensorType = getUnsignedIntFromSensorType(sensorType);
     info->isOnChange = sensorTypeIsOnChange(sensorType);
     info->isOneShot = sensorTypeIsOneShot(sensorType);
     info->unusedFlags = 0;

     // Platform-specific properties.
     size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
     const Sensor& sensor = mSensorRequests[sensorIndex].sensor;
     info->sensorName = sensor.getSensorName();

     // minInterval was added in CHRE API 1.1.
     if (nanoapp->getTargetApiVersion() >= CHRE_API_VERSION_1_1) {
       info->minInterval = info->isOneShot ? CHRE_SENSOR_INTERVAL_DEFAULT :
           sensor.getMinInterval();
     }
   }
   return success;
 }

 bool SensorRequestManager::removeAllRequests(SensorType sensorType) {
   bool success = false;
   if (sensorType == SensorType::Unknown) {
     LOGW("Attempting to remove all requests of an invalid sensor type");
   } else {
     size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
     SensorRequests& requests = mSensorRequests[sensorIndex];
     uint16_t eventType = getSampleEventTypeForSensorType(sensorType);

     for (const SensorRequest& request : requests.multiplexer.getRequests()) {
       Nanoapp *nanoapp = request.getNanoapp();
       nanoapp->unregisterForBroadcastEvent(eventType);
     }

     success = requests.removeAll();
   }
   return success;
 }

 Sensor *SensorRequestManager::getSensor(SensorType sensorType) {
   Sensor *sensorPtr = nullptr;
   if (sensorType == SensorType::Unknown) {
     LOGW("Attempting to get Sensor of an invalid SensorType");
   } else {
     size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
     sensorPtr = &mSensorRequests[sensorIndex].sensor;
   }
   return sensorPtr;
 }

 const SensorRequest *SensorRequestManager::SensorRequests::find(
     const Nanoapp *nanoapp, size_t *index) const {
   CHRE_ASSERT(index);

   const auto& requests = multiplexer.getRequests();
   for (size_t i = 0; i < requests.size(); i++) {
     const SensorRequest& sensorRequest = requests[i];
     if (sensorRequest.getNanoapp() == nanoapp) {
       *index = i;
       return &sensorRequest;
     }
   }

   return nullptr;
 }

 bool SensorRequestManager::SensorRequests::add(const SensorRequest& request,
                                                bool *requestChanged) {
   CHRE_ASSERT(requestChanged != nullptr);

   size_t addIndex;
   bool success = true;
   if (!multiplexer.addRequest(request, &addIndex, requestChanged)) {
     *requestChanged = false;
     success = false;
     LOG_OOM();
   } else if (*requestChanged) {
     success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
     if (!success) {
       // Remove the newly added request since the platform failed to handle it.
       // The sensor is expected to maintain the existing request so there is no
       // need to reset the platform to the last maximal request.
       multiplexer.removeRequest(addIndex, requestChanged);

       // This is a roll-back operation so the maximal change in the multiplexer
       // must not have changed. The request changed state is forced to false.
       *requestChanged = false;
     }
   }

   return success;
 }

 bool SensorRequestManager::SensorRequests::remove(size_t removeIndex,
                                                   bool *requestChanged) {
   CHRE_ASSERT(requestChanged != nullptr);

   bool success = true;
   multiplexer.removeRequest(removeIndex, requestChanged);
   if (*requestChanged) {
     success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
     if (!success) {
       LOGE("SensorRequestManager failed to remove a request");

       // If the platform fails to handle this request in a debug build there is
       // likely an error in the platform. This is not strictly a programming
       // error but it does make sense to use assert semantics when a platform
       // fails to handle a request that it had been sent previously.
       CHRE_ASSERT(false);

       // The request to the platform to set a request when removing has failed
       // so the request has not changed.
       *requestChanged = false;
     }
   }

   return success;
 }

 bool SensorRequestManager::SensorRequests::update(size_t updateIndex,
                                                   const SensorRequest& request,
                                                   bool *requestChanged) {
   CHRE_ASSERT(requestChanged != nullptr);

   bool success = true;
   SensorRequest previousRequest = multiplexer.getRequests()[updateIndex];
   multiplexer.updateRequest(updateIndex, request, requestChanged);
   if (*requestChanged) {
     success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
     if (!success) {
       // Roll back the request since sending it to the sensor failed. The
       // request will roll back to the previous maximal. The sensor is
       // expected to maintain the existing request if a request fails so there
       // is no need to reset the platform to the last maximal request.
       multiplexer.updateRequest(updateIndex, previousRequest, requestChanged);

       // This is a roll-back operation so the maximal change in the multiplexer
       // must not have changed. The request changed state is forced to false.
       *requestChanged = false;
     }
   }

   return success;
 }

 bool SensorRequestManager::SensorRequests::removeAll() {
   bool requestChanged;
   multiplexer.removeAllRequests(&requestChanged);

   bool success = true;
   if (requestChanged) {
     SensorRequest maximalRequest = multiplexer.getCurrentMaximalRequest();
     success = sensor.setRequest(maximalRequest);
     if (!success) {
       LOGE("SensorRequestManager failed to remove all request");

       // If the platform fails to handle this request in a debug build there is
       // likely an error in the platform. This is not strictly a programming
       // error but it does make sense to use assert semantics when a platform
       // fails to handle a request that it had been sent previously.
       CHRE_ASSERT(false);
     }
   }
   return success;
 }

 }  // namespace chre
	/*
	* Copyright (C) 2016 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.
	*/

	#include "chre/core/sensor_request_manager.h"

	#include "chre/core/event_loop_manager.h"
	#include "chre/platform/fatal_error.h"
	#include "chre_api/chre/version.h"

	namespace chre {
	namespace {

	bool isSensorRequestValid(const Sensor& sensor,
	const SensorRequest& sensorRequest) {
	bool isRequestContinuous = sensorModeIsContinuous(
	sensorRequest.getMode());
	bool isRequestOneShot = sensorModeIsOneShot(sensorRequest.getMode());
	uint64_t requestedInterval = sensorRequest.getInterval().toRawNanoseconds();
	uint64_t requestedLatency = sensorRequest.getLatency().toRawNanoseconds();
	SensorType sensorType = sensor.getSensorType();

	bool success = true;
	if (isRequestContinuous) {
	if (sensorTypeIsOneShot(sensorType)) {
	success = false;
	LOGE("Invalid continuous request for a one-shot sensor.");
	} else if (requestedInterval < sensor.getMinInterval()) {
	success = false;
	LOGE("Invalid requested interval %" PRIu64 " for a continuous sensor"
	" with minInterval %" PRIu64,
	requestedInterval, sensor.getMinInterval());
	}
	} else if (isRequestOneShot) {
	if (!sensorTypeIsOneShot(sensorType)) {
	success = false;
	LOGE("Invalid one-shot request for a continuous sensor.");
	} else if (requestedInterval != CHRE_SENSOR_INTERVAL_DEFAULT \|\|
	requestedLatency != CHRE_SENSOR_LATENCY_DEFAULT) {
	success = false;
	LOGE("Invalid interval and/or latency for a one-shot request.");
	}
	}
	return success;
	}

	} // namespace

	SensorRequestManager::SensorRequestManager() {
	mSensorRequests.resize(mSensorRequests.capacity());

	DynamicVector<PlatformSensor> platformSensors;
	if (!PlatformSensor::getSensors(&platformSensors)) {
	LOGE("Failed to query the platform for sensors");
	return;
	}

	if (platformSensors.empty()) {
	LOGW("Platform returned zero sensors");
	}

	for (size_t i = 0; i < platformSensors.size(); i++) {
	SensorType sensorType = platformSensors[i].getSensorType();
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	LOGD("Found sensor: %s", getSensorTypeName(sensorType));

	mSensorRequests[sensorIndex].sensor =
	Sensor(std::move(platformSensors[i]));
	}
	}

	SensorRequestManager::~SensorRequestManager() {
	SensorRequest nullRequest = SensorRequest();
	for (size_t i = 0; i < mSensorRequests.size(); i++) {
	// Disable sensors that have been enabled previously.
	Sensor& sensor = mSensorRequests[i].sensor;
	sensor.setRequest(nullRequest);
	}
	}

	bool SensorRequestManager::getSensorHandle(SensorType sensorType,
	uint32_t *sensorHandle) const {
	CHRE_ASSERT(sensorHandle);

	bool sensorHandleIsValid = false;
	if (sensorType == SensorType::Unknown) {
	LOGW("Querying for unknown sensor type");
	} else {
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	sensorHandleIsValid = mSensorRequests[sensorIndex].sensor.isValid();
	if (sensorHandleIsValid) {
	*sensorHandle = getSensorHandleFromSensorType(sensorType);
	}
	}

	return sensorHandleIsValid;
	}

	bool SensorRequestManager::setSensorRequest(Nanoapp *nanoapp,
	uint32_t sensorHandle, const SensorRequest& sensorRequest) {
	CHRE_ASSERT(nanoapp);

	// Validate the input to ensure that a valid handle has been provided.
	SensorType sensorType = getSensorTypeFromSensorHandle(sensorHandle);
	if (sensorType == SensorType::Unknown) {
	LOGW("Attempting to configure an invalid handle");
	return false;
	}

	// Ensure that the runtime is aware of this sensor type.
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	SensorRequests& requests = mSensorRequests[sensorIndex];
	const Sensor& sensor = requests.sensor;

	if (!sensor.isValid()) {
	LOGW("Attempting to configure non-existent sensor");
	return false;
	} else if (!isSensorRequestValid(sensor, sensorRequest)) {
	return false;
	}

	size_t requestIndex;
	uint16_t eventType = getSampleEventTypeForSensorType(sensorType);
	bool nanoappHasRequest = (requests.find(nanoapp, &requestIndex) != nullptr);

	bool success;
	bool requestChanged;
	if (sensorRequest.getMode() == SensorMode::Off) {
	if (nanoappHasRequest) {
	// The request changes the mode to off and there was an existing request.
	// The existing request is removed from the multiplexer. The nanoapp is
	// unregistered from events of this type if this request was successful.
	success = requests.remove(requestIndex, &requestChanged);
	if (success) {
	nanoapp->unregisterForBroadcastEvent(eventType);
	}
	} else {
	// The sensor is being configured to Off, but is already Off (there is no
	// existing request). We assign to success to be true and no other
	// operation is required.
	requestChanged = false;
	success = true;
	}
	} else if (!nanoappHasRequest) {
	// The request changes the mode to the enabled state and there was no
	// existing request. The request is newly created and added to the
	// multiplexer. The nanoapp is registered for events if this request was
	// successful.
	success = requests.add(sensorRequest, &requestChanged);
	if (success) {
	nanoapp->registerForBroadcastEvent(eventType);

	// Deliver last valid event to new clients of on-change sensors
	if (sensorTypeIsOnChange(sensor.getSensorType())
	&& sensor.getLastEvent() != nullptr) {
	EventLoopManagerSingleton::get()->postEvent(
	getSampleEventTypeForSensorType(sensorType), sensor.getLastEvent(),
	nullptr, kSystemInstanceId, nanoapp->getInstanceId());
	}
	}
	} else {
	// The request changes the mode to the enabled state and there was an
	// existing request. The existing request is updated.
	success = requests.update(requestIndex, sensorRequest, &requestChanged);
	}

	if (requestChanged) {
	// TODO: Send an event to nanoapps to indicate the rate change.
	}

	return success;
	}

	bool SensorRequestManager::getSensorInfo(uint32_t sensorHandle,
	const Nanoapp *nanoapp,
	struct chreSensorInfo *info) const {
	CHRE_ASSERT(nanoapp);
	CHRE_ASSERT(info);

	bool success = false;

	// Validate the input to ensure that a valid handle has been provided.
	SensorType sensorType = getSensorTypeFromSensorHandle(sensorHandle);
	if (sensorType == SensorType::Unknown) {
	LOGW("Attempting to access sensor with an invalid handle %" PRIu32,
	sensorHandle);
	} else {
	success = true;

	// Platform-independent properties.
	info->sensorType = getUnsignedIntFromSensorType(sensorType);
	info->isOnChange = sensorTypeIsOnChange(sensorType);
	info->isOneShot = sensorTypeIsOneShot(sensorType);
	info->unusedFlags = 0;

	// Platform-specific properties.
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	const Sensor& sensor = mSensorRequests[sensorIndex].sensor;
	info->sensorName = sensor.getSensorName();

	// minInterval was added in CHRE API 1.1.
	if (nanoapp->getTargetApiVersion() >= CHRE_API_VERSION_1_1) {
	info->minInterval = info->isOneShot ? CHRE_SENSOR_INTERVAL_DEFAULT :
	sensor.getMinInterval();
	}
	}
	return success;
	}

	bool SensorRequestManager::removeAllRequests(SensorType sensorType) {
	bool success = false;
	if (sensorType == SensorType::Unknown) {
	LOGW("Attempting to remove all requests of an invalid sensor type");
	} else {
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	SensorRequests& requests = mSensorRequests[sensorIndex];
	uint16_t eventType = getSampleEventTypeForSensorType(sensorType);

	for (const SensorRequest& request : requests.multiplexer.getRequests()) {
	Nanoapp *nanoapp = request.getNanoapp();
	nanoapp->unregisterForBroadcastEvent(eventType);
	}

	success = requests.removeAll();
	}
	return success;
	}

	Sensor *SensorRequestManager::getSensor(SensorType sensorType) {
	Sensor *sensorPtr = nullptr;
	if (sensorType == SensorType::Unknown) {
	LOGW("Attempting to get Sensor of an invalid SensorType");
	} else {
	size_t sensorIndex = getSensorTypeArrayIndex(sensorType);
	sensorPtr = &mSensorRequests[sensorIndex].sensor;
	}
	return sensorPtr;
	}

	const SensorRequest *SensorRequestManager::SensorRequests::find(
	const Nanoapp nanoapp, size_t index) const {
	CHRE_ASSERT(index);

	const auto& requests = multiplexer.getRequests();
	for (size_t i = 0; i < requests.size(); i++) {
	const SensorRequest& sensorRequest = requests[i];
	if (sensorRequest.getNanoapp() == nanoapp) {
	*index = i;
	return &sensorRequest;
	}
	}

	return nullptr;
	}

	bool SensorRequestManager::SensorRequests::add(const SensorRequest& request,
	bool *requestChanged) {
	CHRE_ASSERT(requestChanged != nullptr);

	size_t addIndex;
	bool success = true;
	if (!multiplexer.addRequest(request, &addIndex, requestChanged)) {
	*requestChanged = false;
	success = false;
	LOG_OOM();
	} else if (*requestChanged) {
	success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
	if (!success) {
	// Remove the newly added request since the platform failed to handle it.
	// The sensor is expected to maintain the existing request so there is no
	// need to reset the platform to the last maximal request.
	multiplexer.removeRequest(addIndex, requestChanged);

	// This is a roll-back operation so the maximal change in the multiplexer
	// must not have changed. The request changed state is forced to false.
	*requestChanged = false;
	}
	}

	return success;
	}

	bool SensorRequestManager::SensorRequests::remove(size_t removeIndex,
	bool *requestChanged) {
	CHRE_ASSERT(requestChanged != nullptr);

	bool success = true;
	multiplexer.removeRequest(removeIndex, requestChanged);
	if (*requestChanged) {
	success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
	if (!success) {
	LOGE("SensorRequestManager failed to remove a request");

	// If the platform fails to handle this request in a debug build there is
	// likely an error in the platform. This is not strictly a programming
	// error but it does make sense to use assert semantics when a platform
	// fails to handle a request that it had been sent previously.
	CHRE_ASSERT(false);

	// The request to the platform to set a request when removing has failed
	// so the request has not changed.
	*requestChanged = false;
	}
	}

	return success;
	}

	bool SensorRequestManager::SensorRequests::update(size_t updateIndex,
	const SensorRequest& request,
	bool *requestChanged) {
	CHRE_ASSERT(requestChanged != nullptr);

	bool success = true;
	SensorRequest previousRequest = multiplexer.getRequests()[updateIndex];
	multiplexer.updateRequest(updateIndex, request, requestChanged);
	if (*requestChanged) {
	success = sensor.setRequest(multiplexer.getCurrentMaximalRequest());
	if (!success) {
	// Roll back the request since sending it to the sensor failed. The
	// request will roll back to the previous maximal. The sensor is
	// expected to maintain the existing request if a request fails so there
	// is no need to reset the platform to the last maximal request.
	multiplexer.updateRequest(updateIndex, previousRequest, requestChanged);

	// This is a roll-back operation so the maximal change in the multiplexer
	// must not have changed. The request changed state is forced to false.
	*requestChanged = false;
	}
	}

	return success;
	}

	bool SensorRequestManager::SensorRequests::removeAll() {
	bool requestChanged;
	multiplexer.removeAllRequests(&requestChanged);

	bool success = true;
	if (requestChanged) {
	SensorRequest maximalRequest = multiplexer.getCurrentMaximalRequest();
	success = sensor.setRequest(maximalRequest);
	if (!success) {
	LOGE("SensorRequestManager failed to remove all request");

	// If the platform fails to handle this request in a debug build there is
	// likely an error in the platform. This is not strictly a programming
	// error but it does make sense to use assert semantics when a platform
	// fails to handle a request that it had been sent previously.
	CHRE_ASSERT(false);
	}
	}
	return success;
	}

	} // namespace chre