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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/memory/swap_metrics_driver_impl.h"
#include <memory>
#include "base/sequence_checker.h"
#include "base/time/time.h"
namespace content {
SwapMetricsDriverImpl::Delegate::Delegate() = default;
SwapMetricsDriverImpl::Delegate::~Delegate() = default;
SwapMetricsDriverImpl::SwapMetricsDriverImpl(
std::unique_ptr<Delegate> delegate,
const base::TimeDelta update_interval)
: delegate_(std::move(delegate)),
update_interval_(update_interval),
is_initialized_(false) {
DCHECK(delegate_);
DETACH_FROM_SEQUENCE(sequence_checker_);
}
SwapMetricsDriverImpl::~SwapMetricsDriverImpl() = default;
SwapMetricsDriver::SwapMetricsUpdateResult
SwapMetricsDriverImpl::InitializeMetrics() {
last_ticks_ = base::TimeTicks();
auto result = UpdateMetricsImpl();
if (result ==
SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess)
is_initialized_ = true;
return result;
}
bool SwapMetricsDriverImpl::IsRunning() {
return timer_.IsRunning();
}
void SwapMetricsDriverImpl::PeriodicUpdateMetrics() {
SwapMetricsDriver::SwapMetricsUpdateResult result = UpdateMetricsImpl();
if (result !=
SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess)
Stop();
}
SwapMetricsDriver::SwapMetricsUpdateResult SwapMetricsDriverImpl::Start() {
DCHECK(update_interval_.InSeconds() > 0);
SwapMetricsDriver::SwapMetricsUpdateResult result = InitializeMetrics();
if (result !=
SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess)
return result;
timer_.Start(FROM_HERE, update_interval_, this,
&SwapMetricsDriverImpl::PeriodicUpdateMetrics);
return SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess;
}
void SwapMetricsDriverImpl::Stop() {
timer_.Stop();
}
SwapMetricsDriver::SwapMetricsUpdateResult
SwapMetricsDriverImpl::UpdateMetrics() {
// Enforce initialization before updates.
DCHECK(is_initialized_);
return UpdateMetricsImpl();
}
SwapMetricsDriver::SwapMetricsUpdateResult
SwapMetricsDriverImpl::UpdateMetricsImpl() {
// This covers all cases where metrics get updated, and is the critical secion
// in the driver.
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
base::TimeTicks now = base::TimeTicks::Now();
base::TimeDelta interval =
last_ticks_.is_null() ? base::TimeDelta() : now - last_ticks_;
SwapMetricsDriver::SwapMetricsUpdateResult result =
UpdateMetricsInternal(interval);
if (result !=
SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess) {
delegate_->OnUpdateMetricsFailed();
return result;
}
last_ticks_ = now;
return SwapMetricsDriver::SwapMetricsUpdateResult::kSwapMetricsUpdateSuccess;
}
} // namespace content
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