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// Copyright 2015 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 "extensions/browser/load_monitoring_extension_host_queue.h"
#include <algorithm>
#include "base/bind.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram_macros.h"
#include "content/public/browser/render_frame_host.h"
#include "extensions/browser/extension_host.h"
#include "extensions/browser/extension_host_observer.h"
#include "extensions/browser/serial_extension_host_queue.h"
namespace extensions {
LoadMonitoringExtensionHostQueue::LoadMonitoringExtensionHostQueue(
scoped_ptr<ExtensionHostQueue> delegate,
base::TimeDelta monitor_time,
const FinishedCallback& finished_callback)
: delegate_(delegate.Pass()),
monitor_time_(monitor_time),
finished_callback_(finished_callback),
started_(false),
num_queued_(0u),
num_loaded_(0u),
max_in_queue_(0u),
max_active_loading_(0u),
weak_ptr_factory_(this) {
}
LoadMonitoringExtensionHostQueue::LoadMonitoringExtensionHostQueue(
scoped_ptr<ExtensionHostQueue> delegate)
: LoadMonitoringExtensionHostQueue(delegate.Pass(),
base::TimeDelta::FromMinutes(1),
FinishedCallback()) {
}
LoadMonitoringExtensionHostQueue::~LoadMonitoringExtensionHostQueue() {
}
void LoadMonitoringExtensionHostQueue::StartMonitoring() {
if (started_) {
return;
}
started_ = true;
base::MessageLoop::current()->PostDelayedTask(
FROM_HERE, base::Bind(&LoadMonitoringExtensionHostQueue::FinishMonitoring,
weak_ptr_factory_.GetWeakPtr()),
monitor_time_);
}
void LoadMonitoringExtensionHostQueue::Add(DeferredStartRenderHost* host) {
StartMonitoring();
delegate_->Add(host);
if (in_queue_.insert(host).second) {
++num_queued_;
max_in_queue_ = std::max(max_in_queue_, in_queue_.size());
host->AddDeferredStartRenderHostObserver(this);
}
}
void LoadMonitoringExtensionHostQueue::Remove(DeferredStartRenderHost* host) {
delegate_->Remove(host);
RemoveFromQueue(host);
}
void LoadMonitoringExtensionHostQueue::OnDeferredStartRenderHostDidStartLoading(
const DeferredStartRenderHost* host) {
StartMonitoringHost(host);
}
void LoadMonitoringExtensionHostQueue::OnDeferredStartRenderHostDidStopLoading(
const DeferredStartRenderHost* host) {
FinishMonitoringHost(host);
}
void LoadMonitoringExtensionHostQueue::OnDeferredStartRenderHostDestroyed(
const DeferredStartRenderHost* host) {
FinishMonitoringHost(host);
}
void LoadMonitoringExtensionHostQueue::StartMonitoringHost(
const DeferredStartRenderHost* host) {
if (active_loading_.insert(host).second) {
max_active_loading_ = std::max(max_active_loading_, active_loading_.size());
}
RemoveFromQueue(host);
}
void LoadMonitoringExtensionHostQueue::FinishMonitoringHost(
const DeferredStartRenderHost* host) {
if (active_loading_.erase(host)) {
++num_loaded_;
}
}
void LoadMonitoringExtensionHostQueue::RemoveFromQueue(
const DeferredStartRenderHost* const_host) {
// This odd code is needed because StartMonitoringHost() gives us a const
// host, but we need a non-const one for
// RemoveDeferredStartRenderHostObserver().
for (DeferredStartRenderHost* host : in_queue_) {
if (host == const_host) {
host->RemoveDeferredStartRenderHostObserver(this);
in_queue_.erase(host); // uhoh, iterator invalidated!
break;
}
}
}
void LoadMonitoringExtensionHostQueue::FinishMonitoring() {
CHECK(started_);
UMA_HISTOGRAM_COUNTS_100("Extensions.ExtensionHostMonitoring.NumQueued",
num_queued_);
UMA_HISTOGRAM_COUNTS_100("Extensions.ExtensionHostMonitoring.NumLoaded",
num_loaded_);
UMA_HISTOGRAM_COUNTS_100("Extensions.ExtensionHostMonitoring.MaxInQueue",
max_in_queue_);
UMA_HISTOGRAM_COUNTS_100(
"Extensions.ExtensionHostMonitoring.MaxActiveLoading",
max_active_loading_);
if (!finished_callback_.is_null()) {
finished_callback_.Run(num_queued_, num_loaded_, max_in_queue_,
max_active_loading_);
}
}
} // namespace extensions
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