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// Copyright (c) 2012 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/extensions/state_store.h"
#include "base/bind.h"
#include "base/message_loop.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/extensions/extension.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
namespace {
// Delay, in seconds, before we should open the State Store database. We
// defer it to avoid slowing down startup. See http://crbug.com/161848
const int kInitDelaySeconds = 5;
std::string GetFullKey(const std::string& extension_id,
const std::string& key) {
return extension_id + "." + key;
}
} // namespace
namespace extensions {
// Helper class to delay tasks until we're ready to start executing them.
class StateStore::DelayedTaskQueue {
public:
DelayedTaskQueue() : ready_(false) {}
~DelayedTaskQueue() {}
// Queues up a task for invoking once we're ready. Invokes immediately if
// we're already ready.
void InvokeWhenReady(base::Closure task);
// Marks us ready, and invokes all pending tasks.
void SetReady();
private:
bool ready_;
std::vector<base::Closure> pending_tasks_;
};
void StateStore::DelayedTaskQueue::InvokeWhenReady(base::Closure task) {
if (ready_) {
task.Run();
} else {
pending_tasks_.push_back(task);
}
}
void StateStore::DelayedTaskQueue::SetReady() {
ready_ = true;
for (size_t i = 0; i < pending_tasks_.size(); ++i)
pending_tasks_[i].Run();
pending_tasks_.clear();
}
StateStore::StateStore(Profile* profile,
const FilePath& db_path,
bool deferred_load)
: task_queue_(new DelayedTaskQueue()) {
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_INSTALLED,
content::Source<Profile>(profile));
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
content::Source<Profile>(profile));
if (deferred_load) {
MessageLoop::current()->PostDelayedTask(FROM_HERE,
base::Bind(&StateStore::Init, AsWeakPtr(), db_path),
base::TimeDelta::FromSeconds(kInitDelaySeconds));
} else {
Init(db_path);
}
}
StateStore::StateStore(Profile* profile, ValueStore* value_store)
: store_(value_store), task_queue_(new DelayedTaskQueue()) {
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_INSTALLED,
content::Source<Profile>(profile));
registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNINSTALLED,
content::Source<Profile>(profile));
// This constructor is for testing. No need to delay Init.
Init(FilePath());
}
StateStore::~StateStore() {
}
void StateStore::RegisterKey(const std::string& key) {
registered_keys_.insert(key);
}
void StateStore::GetExtensionValue(const std::string& extension_id,
const std::string& key,
ReadCallback callback) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Get, base::Unretained(&store_),
GetFullKey(extension_id, key), callback));
}
void StateStore::SetExtensionValue(
const std::string& extension_id,
const std::string& key,
scoped_ptr<base::Value> value) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Set, base::Unretained(&store_),
GetFullKey(extension_id, key), base::Passed(value.Pass())));
}
void StateStore::RemoveExtensionValue(const std::string& extension_id,
const std::string& key) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Remove, base::Unretained(&store_),
GetFullKey(extension_id, key)));
}
void StateStore::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
switch (type) {
case chrome::NOTIFICATION_EXTENSION_INSTALLED:
case chrome::NOTIFICATION_EXTENSION_UNINSTALLED:
RemoveKeysForExtension(
content::Details<const Extension>(details).ptr()->id());
break;
default:
NOTREACHED();
return;
}
}
void StateStore::RemoveKeysForExtension(const std::string& extension_id) {
for (std::set<std::string>::iterator key = registered_keys_.begin();
key != registered_keys_.end(); ++key) {
task_queue_->InvokeWhenReady(
base::Bind(&ValueStoreFrontend::Remove, base::Unretained(&store_),
GetFullKey(extension_id, *key)));
}
}
void StateStore::Init(const FilePath& db_path) {
if (!db_path.empty())
store_.Init(db_path);
task_queue_->SetReady();
}
} // namespace extensions
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