1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define DEBUG false  // STOPSHIP if true
18#include "Log.h"
19
20#include "StatsPuller.h"
21#include "guardrail/StatsdStats.h"
22#include "puller_util.h"
23#include "stats_log_util.h"
24#include "StatsPullerManagerImpl.h"
25
26namespace android {
27namespace os {
28namespace statsd {
29
30using std::lock_guard;
31
32sp<UidMap> StatsPuller::mUidMap = nullptr;
33void StatsPuller::SetUidMap(const sp<UidMap>& uidMap) { mUidMap = uidMap; }
34
35// ValueMetric has a minimum bucket size of 10min so that we don't pull too frequently
36StatsPuller::StatsPuller(const int tagId)
37    : mTagId(tagId) {
38    mCoolDownNs = StatsPullerManagerImpl::kAllPullAtomInfo.find(tagId)->second.coolDownNs;
39    VLOG("Puller for tag %d created. Cooldown set to %lld", mTagId, (long long)mCoolDownNs);
40}
41
42bool StatsPuller::Pull(const int64_t elapsedTimeNs, std::vector<std::shared_ptr<LogEvent>>* data) {
43    lock_guard<std::mutex> lock(mLock);
44    int64_t wallClockTimeNs = getWallClockNs();
45    StatsdStats::getInstance().notePull(mTagId);
46    if (elapsedTimeNs - mLastPullTimeNs < mCoolDownNs) {
47        (*data) = mCachedData;
48        StatsdStats::getInstance().notePullFromCache(mTagId);
49        return true;
50    }
51    if (mMinPullIntervalNs > elapsedTimeNs - mLastPullTimeNs) {
52        mMinPullIntervalNs = elapsedTimeNs - mLastPullTimeNs;
53        StatsdStats::getInstance().updateMinPullIntervalSec(mTagId,
54                                                            mMinPullIntervalNs / NS_PER_SEC);
55    }
56    mCachedData.clear();
57    mLastPullTimeNs = elapsedTimeNs;
58    bool ret = PullInternal(&mCachedData);
59    for (const shared_ptr<LogEvent>& data : mCachedData) {
60        data->setElapsedTimestampNs(elapsedTimeNs);
61        data->setLogdWallClockTimestampNs(wallClockTimeNs);
62    }
63    if (ret && mCachedData.size() > 0) {
64      mergeIsolatedUidsToHostUid(mCachedData, mUidMap, mTagId);
65      (*data) = mCachedData;
66    }
67    return ret;
68}
69
70int StatsPuller::ForceClearCache() {
71    return clearCache();
72}
73
74int StatsPuller::clearCache() {
75    lock_guard<std::mutex> lock(mLock);
76    int ret = mCachedData.size();
77    mCachedData.clear();
78    mLastPullTimeNs = 0;
79    return ret;
80}
81
82int StatsPuller::ClearCacheIfNecessary(int64_t timestampNs) {
83    if (timestampNs - mLastPullTimeNs > mCoolDownNs) {
84        return clearCache();
85    } else {
86        return 0;
87    }
88}
89
90}  // namespace statsd
91}  // namespace os
92}  // namespace android
93