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// Copyright (c) 2010 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/message_loop.h"
#include "base/task.h"
#include "chrome/browser/browser_thread.h"
namespace policy {
AsynchronousPolicyLoader::AsynchronousPolicyLoader(
AsynchronousPolicyProvider::Delegate* delegate)
: delegate_(delegate),
provider_(NULL),
origin_loop_(MessageLoop::current()) {}
void AsynchronousPolicyLoader::Init() {
policy_.reset(delegate_->Load());
}
void AsynchronousPolicyLoader::Stop() {
delegate_.reset();
}
void AsynchronousPolicyLoader::SetProvider(
AsynchronousPolicyProvider* provider) {
provider_ = provider;
}
// Manages the life cycle of a new policy map during until it's life cycle is
// taken over by the policy loader.
class UpdatePolicyTask : public Task {
public:
UpdatePolicyTask(scoped_refptr<AsynchronousPolicyLoader> loader,
DictionaryValue* new_policy)
: loader_(loader),
new_policy_(new_policy) {}
virtual void Run() {
loader_->UpdatePolicy(new_policy_.release());
}
private:
scoped_refptr<AsynchronousPolicyLoader> loader_;
scoped_ptr<DictionaryValue> new_policy_;
DISALLOW_COPY_AND_ASSIGN(UpdatePolicyTask);
};
void AsynchronousPolicyLoader::Reload() {
if (delegate_.get()) {
DictionaryValue* new_policy = delegate_->Load();
PostUpdatePolicyTask(new_policy);
}
}
void AsynchronousPolicyLoader::PostUpdatePolicyTask(
DictionaryValue* new_policy) {
origin_loop_->PostTask(FROM_HERE, new UpdatePolicyTask(this, new_policy));
}
void AsynchronousPolicyLoader::UpdatePolicy(DictionaryValue* new_policy_raw) {
DCHECK(policy_.get());
if (!policy_->Equals(new_policy_raw)) {
policy_.reset(new_policy_raw);
// TODO(danno): Change the notification between the provider and the
// PrefStore into a notification mechanism, removing the need for the
// WeakPtr for the provider.
if (provider_)
provider_->NotifyStoreOfPolicyChange();
}
}
} // namespace policy
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