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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.
*/
#pragma once
#include <android/os/IStatsCompanionService.h>
#include <utils/RefBase.h>
#include <mutex>
#include <vector>
#include "packages/UidMap.h"
#include "guardrail/StatsdStats.h"
#include "logd/LogEvent.h"
#include "puller_util.h"
namespace android {
namespace os {
namespace statsd {
class StatsPuller : public virtual RefBase {
public:
explicit StatsPuller(const int tagId);
virtual ~StatsPuller() {}
// Pulls the most recent data.
// The data may be served from cache if consecutive pulls come within
// predefined cooldown time.
// Returns true if the pull was successful.
// Returns false when
// 1) the pull fails
// 2) pull takes longer than mPullTimeoutNs (intrinsic to puller)
// If a metric wants to make any change to the data, like timestamps, it
// should make a copy as this data may be shared with multiple metrics.
bool Pull(std::vector<std::shared_ptr<LogEvent>>* data);
// Clear cache immediately
int ForceClearCache();
// Clear cache if elapsed time is more than cooldown time
int ClearCacheIfNecessary(int64_t timestampNs);
static void SetUidMap(const sp<UidMap>& uidMap);
virtual void SetStatsCompanionService(sp<IStatsCompanionService> statsCompanionService){};
protected:
const int mTagId;
private:
mutable std::mutex mLock;
// Real puller impl.
virtual bool PullInternal(std::vector<std::shared_ptr<LogEvent>>* data) = 0;
bool mHasGoodData = false;
int64_t mLastPullTimeNs;
// Cache of data from last pull. If next request comes before cool down finishes,
// cached data will be returned.
// Cached data is cleared when
// 1) A pull fails
// 2) A new pull request comes after cooldown time.
// 3) clearCache is called.
std::vector<std::shared_ptr<LogEvent>> mCachedData;
int clearCache();
int clearCacheLocked();
static sp<UidMap> mUidMap;
};
} // namespace statsd
} // namespace os
} // namespace android
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