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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/extension_host_queue.h"
#include <algorithm>
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/no_destructor.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/single_thread_task_runner.h"
#include "extensions/browser/deferred_start_render_host.h"
namespace extensions {
ExtensionHostQueue::ExtensionHostQueue() : pending_create_(false) {}
ExtensionHostQueue::~ExtensionHostQueue() = default;
// static
ExtensionHostQueue& ExtensionHostQueue::GetInstance() {
static base::NoDestructor<ExtensionHostQueue> queue;
return *queue;
}
void ExtensionHostQueue::Add(DeferredStartRenderHost* host) {
queue_.push_back(host);
PostTask();
}
void ExtensionHostQueue::Remove(DeferredStartRenderHost* host) {
auto it = std::ranges::find(queue_, host);
if (it != queue_.end()) {
queue_.erase(it);
}
}
void ExtensionHostQueue::PostTask() {
if (!pending_create_) {
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ExtensionHostQueue::ProcessOneHost,
ptr_factory_.GetWeakPtr()),
delay_);
pending_create_ = true;
}
}
void ExtensionHostQueue::ProcessOneHost() {
pending_create_ = false;
if (queue_.empty()) {
return; // can happen on shutdown
}
queue_.front()->CreateRendererNow();
queue_.pop_front();
if (!queue_.empty()) {
PostTask();
}
}
} // namespace extensions
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