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/*
* 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
#include "Log.h"
#include "anomaly/AlarmMonitor.h"
#include "guardrail/StatsdStats.h"
namespace android {
namespace os {
namespace statsd {
AlarmMonitor::AlarmMonitor(
uint32_t minDiffToUpdateRegisteredAlarmTimeSec,
const std::function<void(const shared_ptr<IStatsCompanionService>&, int64_t)>& updateAlarm,
const std::function<void(const shared_ptr<IStatsCompanionService>&)>& cancelAlarm)
: mRegisteredAlarmTimeSec(0),
mMinUpdateTimeSec(minDiffToUpdateRegisteredAlarmTimeSec),
mUpdateAlarm(updateAlarm),
mCancelAlarm(cancelAlarm) {}
AlarmMonitor::~AlarmMonitor() {}
void AlarmMonitor::setStatsCompanionService(
shared_ptr<IStatsCompanionService> statsCompanionService) {
std::lock_guard<std::mutex> lock(mLock);
shared_ptr<IStatsCompanionService> tmpForLock = mStatsCompanionService;
mStatsCompanionService = statsCompanionService;
if (statsCompanionService == nullptr) {
VLOG("Erasing link to statsCompanionService");
return;
}
VLOG("Creating link to statsCompanionService");
const sp<const InternalAlarm> top = mPq.top();
if (top != nullptr) {
updateRegisteredAlarmTime_l(top->timestampSec);
}
}
void AlarmMonitor::add(sp<const InternalAlarm> alarm) {
std::lock_guard<std::mutex> lock(mLock);
if (alarm == nullptr) {
ALOGW("Asked to add a null alarm.");
return;
}
if (alarm->timestampSec < 1) {
// forbidden since a timestamp 0 is used to indicate no alarm registered
ALOGW("Asked to add a 0-time alarm.");
return;
}
// TODO(b/110563466): Ensure that refractory period is respected.
VLOG("Adding alarm with time %u", alarm->timestampSec);
mPq.push(alarm);
if (mRegisteredAlarmTimeSec < 1 ||
alarm->timestampSec + mMinUpdateTimeSec < mRegisteredAlarmTimeSec) {
updateRegisteredAlarmTime_l(alarm->timestampSec);
}
}
void AlarmMonitor::remove(sp<const InternalAlarm> alarm) {
std::lock_guard<std::mutex> lock(mLock);
if (alarm == nullptr) {
ALOGW("Asked to remove a null alarm.");
return;
}
VLOG("Removing alarm with time %u", alarm->timestampSec);
bool wasPresent = mPq.remove(alarm);
if (!wasPresent) return;
if (mPq.empty()) {
VLOG("Queue is empty. Cancel any alarm.");
cancelRegisteredAlarmTime_l();
return;
}
uint32_t soonestAlarmTimeSec = mPq.top()->timestampSec;
VLOG("Soonest alarm is %u", soonestAlarmTimeSec);
if (soonestAlarmTimeSec > mRegisteredAlarmTimeSec + mMinUpdateTimeSec) {
updateRegisteredAlarmTime_l(soonestAlarmTimeSec);
}
}
// More efficient than repeatedly calling remove(mPq.top()) since it batches the
// updates to the registered alarm.
unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> AlarmMonitor::popSoonerThan(
uint32_t timestampSec) {
VLOG("Removing alarms with time <= %u", timestampSec);
unordered_set<sp<const InternalAlarm>, SpHash<InternalAlarm>> oldAlarms;
std::lock_guard<std::mutex> lock(mLock);
for (sp<const InternalAlarm> t = mPq.top(); t != nullptr && t->timestampSec <= timestampSec;
t = mPq.top()) {
oldAlarms.insert(t);
mPq.pop(); // remove t
}
// Always update registered alarm time (if anything has changed).
if (!oldAlarms.empty()) {
if (mPq.empty()) {
VLOG("Queue is empty. Cancel any alarm.");
cancelRegisteredAlarmTime_l();
} else {
// Always update the registered alarm in this case (unlike remove()).
updateRegisteredAlarmTime_l(mPq.top()->timestampSec);
}
}
return oldAlarms;
}
void AlarmMonitor::updateRegisteredAlarmTime_l(uint32_t timestampSec) {
VLOG("Updating reg alarm time to %u", timestampSec);
mRegisteredAlarmTimeSec = timestampSec;
mUpdateAlarm(mStatsCompanionService, secToMs(mRegisteredAlarmTimeSec));
}
void AlarmMonitor::cancelRegisteredAlarmTime_l() {
VLOG("Cancelling reg alarm.");
mRegisteredAlarmTimeSec = 0;
mCancelAlarm(mStatsCompanionService);
}
int64_t AlarmMonitor::secToMs(uint32_t timeSec) {
return ((int64_t)timeSec) * 1000;
}
} // namespace statsd
} // namespace os
} // namespace android
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