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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/metrics/metrics_reporting_scheduler.h"
#include <stdint.h>
#include "base/compiler_specific.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_number_conversions.h"
#include "build/build_config.h"
#include "components/variations/variations_associated_data.h"
using base::TimeDelta;
namespace metrics {
namespace {
// The delay, in seconds, after startup before sending the first log message.
#if defined(OS_ANDROID) || defined(OS_IOS)
// Sessions are more likely to be short on a mobile device, so handle the
// initial log quickly.
const int kInitialUploadIntervalSeconds = 15;
#else
const int kInitialUploadIntervalSeconds = 60;
#endif
// The delay, in seconds, between uploading when there are queued logs from
// previous sessions to send.
#if defined(OS_ANDROID) || defined(OS_IOS)
// Sending in a burst is better on a mobile device, since keeping the radio on
// is very expensive.
const int kUnsentLogsIntervalSeconds = 3;
#else
const int kUnsentLogsIntervalSeconds = 15;
#endif
// When uploading metrics to the server fails, we progressively wait longer and
// longer before sending the next log. This backoff process helps reduce load
// on a server that is having issues.
// The following is the multiplier we use to expand that inter-log duration.
const double kBackoffMultiplier = 1.1;
// The maximum backoff multiplier.
const int kMaxBackoffMultiplier = 10;
} // anonymous namespace
MetricsReportingScheduler::MetricsReportingScheduler(
const base::Closure& upload_callback,
const base::Callback<base::TimeDelta(void)>& upload_interval_callback)
: upload_callback_(upload_callback),
upload_interval_(TimeDelta::FromSeconds(kInitialUploadIntervalSeconds)),
running_(false),
callback_pending_(false),
init_task_complete_(false),
waiting_for_init_task_complete_(false),
upload_interval_callback_(upload_interval_callback) {
}
MetricsReportingScheduler::~MetricsReportingScheduler() {}
void MetricsReportingScheduler::Start() {
running_ = true;
ScheduleNextUpload();
}
void MetricsReportingScheduler::Stop() {
running_ = false;
if (upload_timer_.IsRunning())
upload_timer_.Stop();
}
// Callback from MetricsService when the startup init task has completed.
void MetricsReportingScheduler::InitTaskComplete() {
DCHECK(!init_task_complete_);
init_task_complete_ = true;
if (waiting_for_init_task_complete_) {
waiting_for_init_task_complete_ = false;
TriggerUpload();
} else {
LogMetricsInitSequence(INIT_TASK_COMPLETED_FIRST);
}
}
void MetricsReportingScheduler::UploadFinished(bool server_is_healthy,
bool more_logs_remaining) {
DCHECK(callback_pending_);
callback_pending_ = false;
// If the server is having issues, back off. Otherwise, reset to default
// (unless there are more logs to send, in which case the next upload should
// happen sooner).
if (!server_is_healthy) {
BackOffUploadInterval();
} else if (more_logs_remaining) {
upload_interval_ = TimeDelta::FromSeconds(kUnsentLogsIntervalSeconds);
} else {
upload_interval_ = GetStandardUploadInterval();
last_upload_finish_time_ = base::TimeTicks::Now();
}
if (running_)
ScheduleNextUpload();
}
void MetricsReportingScheduler::UploadCancelled() {
DCHECK(callback_pending_);
callback_pending_ = false;
if (running_)
ScheduleNextUpload();
}
void MetricsReportingScheduler::SetUploadIntervalForTesting(
base::TimeDelta interval) {
upload_interval_ = interval;
}
void MetricsReportingScheduler::LogMetricsInitSequence(InitSequence sequence) {
UMA_HISTOGRAM_ENUMERATION("UMA.InitSequence", sequence,
INIT_SEQUENCE_ENUM_SIZE);
}
void MetricsReportingScheduler::LogActualUploadInterval(TimeDelta interval) {
UMA_HISTOGRAM_CUSTOM_COUNTS("UMA.ActualLogUploadInterval",
interval.InMinutes(),
1,
base::TimeDelta::FromHours(12).InMinutes(),
50);
}
void MetricsReportingScheduler::TriggerUpload() {
// If the timer fired before the init task has completed, don't trigger the
// upload yet - wait for the init task to complete and do it then.
if (!init_task_complete_) {
LogMetricsInitSequence(TIMER_FIRED_FIRST);
waiting_for_init_task_complete_ = true;
return;
}
if (!last_upload_finish_time_.is_null()) {
LogActualUploadInterval(base::TimeTicks::Now() - last_upload_finish_time_);
last_upload_finish_time_ = base::TimeTicks();
}
callback_pending_ = true;
upload_callback_.Run();
}
void MetricsReportingScheduler::ScheduleNextUpload() {
DCHECK(running_);
if (upload_timer_.IsRunning() || callback_pending_)
return;
upload_timer_.Start(FROM_HERE, upload_interval_, this,
&MetricsReportingScheduler::TriggerUpload);
}
void MetricsReportingScheduler::BackOffUploadInterval() {
DCHECK_GT(kBackoffMultiplier, 1.0);
upload_interval_ = TimeDelta::FromMicroseconds(static_cast<int64_t>(
kBackoffMultiplier * upload_interval_.InMicroseconds()));
TimeDelta max_interval = kMaxBackoffMultiplier * GetStandardUploadInterval();
if (upload_interval_ > max_interval || upload_interval_.InSeconds() < 0) {
upload_interval_ = max_interval;
}
}
base::TimeDelta MetricsReportingScheduler::GetStandardUploadInterval() {
return upload_interval_callback_.Run();
}
} // namespace metrics
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