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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.
#ifndef CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
#define CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
#include <map>
#include "base/memory/linked_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "chrome/browser/profiles/profile_keyed_service.h"
#include "chrome/common/chrome_notification_types.h"
#include "chrome/common/extensions/extension.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/notification_service.h"
using content::BrowserThread;
namespace extensions {
// An ApiResourceManager manages the lifetime of a set of resources that
// ApiFunctions use. Examples are sockets or USB connections.
template <class T>
class ApiResourceManager : public ProfileKeyedService,
public base::NonThreadSafe,
public content::NotificationObserver {
public:
explicit ApiResourceManager(const BrowserThread::ID thread_id)
: thread_id_(thread_id),
data_(new ApiResourceData(thread_id)) {
registrar_.Add(this,
chrome::NOTIFICATION_EXTENSION_UNLOADED,
content::NotificationService::AllSources());
}
virtual ~ApiResourceManager() {
DCHECK(CalledOnValidThread());
DCHECK(BrowserThread::IsMessageLoopValid(thread_id_)) <<
"A unit test is using an ApiResourceManager but didn't provide "
"the thread message loop needed for that kind of resource. "
"Please ensure that the appropriate message loop is operational.";
BrowserThread::DeleteSoon(thread_id_, FROM_HERE, data_.release());
}
// Takes ownership.
int Add(T* api_resource) {
return data_->Add(api_resource);
}
void Remove(const std::string& extension_id, int api_resource_id) {
data_->Remove(extension_id, api_resource_id);
}
T* Get(const std::string& extension_id, int api_resource_id) {
return data_->Get(extension_id, api_resource_id);
}
protected:
// content::NotificationObserver:
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE {
switch (type) {
case chrome::NOTIFICATION_EXTENSION_UNLOADED: {
std::string id =
content::Details<extensions::UnloadedExtensionInfo>(details)->
extension->id();
data_->InitiateCleanup(id);
break;
}
}
}
private:
// ApiResourceData class handles resource bookkeeping on a thread
// where resource lifetime is handled.
class ApiResourceData {
public:
typedef std::map<int, linked_ptr<T> > ApiResourceMap;
// Lookup map from extension id's to allocated resource id's.
typedef std::map<std::string, base::hash_set<int> > ExtensionToResourceMap;
explicit ApiResourceData(const BrowserThread::ID thread_id)
: next_id_(1),
thread_id_(thread_id) {
}
int Add(T* api_resource) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
int id = GenerateId();
if (id > 0) {
linked_ptr<T> resource_ptr(api_resource);
api_resource_map_[id] = resource_ptr;
const std::string& extension_id = api_resource->owner_extension_id();
if (extension_resource_map_.find(extension_id) ==
extension_resource_map_.end()) {
extension_resource_map_[extension_id] = base::hash_set<int>();
}
extension_resource_map_[extension_id].insert(id);
return id;
}
return 0;
}
void Remove(const std::string& extension_id, int api_resource_id) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
if (GetOwnedResource(extension_id, api_resource_id) != NULL) {
DCHECK(extension_resource_map_.find(extension_id) !=
extension_resource_map_.end());
extension_resource_map_[extension_id].erase(api_resource_id);
api_resource_map_.erase(api_resource_id);
}
}
T* Get(const std::string& extension_id, int api_resource_id) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
return GetOwnedResource(extension_id, api_resource_id);
}
void InitiateCleanup(const std::string& extension_id) {
BrowserThread::PostTask(thread_id_, FROM_HERE,
base::Bind(&ApiResourceData::CleanupResourcesFromExtension,
base::Unretained(this), extension_id));
}
private:
T* GetOwnedResource(const std::string& extension_id,
int api_resource_id) {
linked_ptr<T> ptr = api_resource_map_[api_resource_id];
T* resource = ptr.get();
if (resource && extension_id == resource->owner_extension_id())
return resource;
return NULL;
}
void CleanupResourcesFromExtension(const std::string& extension_id) {
DCHECK(BrowserThread::CurrentlyOn(thread_id_));
if (extension_resource_map_.find(extension_id) !=
extension_resource_map_.end()) {
base::hash_set<int>& resource_ids =
extension_resource_map_[extension_id];
for (base::hash_set<int>::iterator it = resource_ids.begin();
it != resource_ids.end(); ++it) {
api_resource_map_.erase(*it);
}
extension_resource_map_.erase(extension_id);
}
}
int GenerateId() {
return next_id_++;
}
int next_id_;
const BrowserThread::ID thread_id_;
ApiResourceMap api_resource_map_;
ExtensionToResourceMap extension_resource_map_;
};
const BrowserThread::ID thread_id_;
content::NotificationRegistrar registrar_;
scoped_ptr<ApiResourceData> data_;
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_API_API_RESOURCE_MANAGER_H_
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