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// Copyright (c) 2011 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 "chrome/browser/policy/asynchronous_policy_loader.h"
#include "base/bind.h"
#include "base/message_loop.h"
#include "content/public/browser/browser_thread.h"
namespace policy {
AsynchronousPolicyLoader::AsynchronousPolicyLoader(
AsynchronousPolicyProvider::Delegate* delegate,
int reload_interval_minutes)
: delegate_(delegate),
ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)),
reload_interval_(base::TimeDelta::FromMinutes(reload_interval_minutes)),
origin_loop_(MessageLoop::current()),
stopped_(false) {}
void AsynchronousPolicyLoader::Init(const base::Closure& callback) {
updates_callback_ = callback;
policy_.reset(delegate_->Load());
// Initialization can happen early when the file thread is not yet available,
// but the subclass of the loader must do some of their initialization on the
// file thread. Posting to the file thread directly before it is initialized
// will cause the task to be forgotten. Instead, post a task to the ui thread
// to delay the remainder of initialization until threading is fully
// initialized.
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&AsynchronousPolicyLoader::InitAfterFileThreadAvailable,
this));
}
void AsynchronousPolicyLoader::Stop() {
if (!stopped_) {
stopped_ = true;
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
base::Bind(&AsynchronousPolicyLoader::StopOnFileThread, this));
}
}
AsynchronousPolicyLoader::~AsynchronousPolicyLoader() {
}
void AsynchronousPolicyLoader::Reload() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
if (delegate_.get()) {
PostUpdatePolicyTask(delegate_->Load());
}
}
void AsynchronousPolicyLoader::CancelReloadTask() {
weak_ptr_factory_.InvalidateWeakPtrs();
}
void AsynchronousPolicyLoader::ScheduleReloadTask(
const base::TimeDelta& delay) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
CancelReloadTask();
BrowserThread::PostDelayedTask(
BrowserThread::FILE, FROM_HERE,
base::Bind(&AsynchronousPolicyLoader::ReloadFromTask,
weak_ptr_factory_.GetWeakPtr()),
delay.InMilliseconds());
}
void AsynchronousPolicyLoader::ScheduleFallbackReloadTask() {
// As a safeguard in case that the load delegate failed to timely notice a
// change in policy, schedule a reload task that'll make us recheck after a
// reasonable interval.
ScheduleReloadTask(reload_interval_);
}
void AsynchronousPolicyLoader::ReloadFromTask() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
Reload();
}
void AsynchronousPolicyLoader::InitOnFileThread() {
}
void AsynchronousPolicyLoader::StopOnFileThread() {
delegate_.reset();
CancelReloadTask();
}
void AsynchronousPolicyLoader::PostUpdatePolicyTask(
DictionaryValue* new_policy) {
// TODO(joaodasilva): make the callback own |new_policy|.
origin_loop_->PostTask(
FROM_HERE,
base::Bind(&AsynchronousPolicyLoader::UpdatePolicy, this, new_policy));
}
void AsynchronousPolicyLoader::UpdatePolicy(DictionaryValue* new_policy_raw) {
scoped_ptr<DictionaryValue> new_policy(new_policy_raw);
DCHECK(policy_.get());
policy_.swap(new_policy);
if (!stopped_)
updates_callback_.Run();
}
void AsynchronousPolicyLoader::InitAfterFileThreadAvailable() {
if (!stopped_) {
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
base::Bind(&AsynchronousPolicyLoader::InitOnFileThread, this));
}
}
} // namespace policy
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