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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.
#ifndef WEBKIT_APPCACHE_APPCACHE_HOST_H_
#define WEBKIT_APPCACHE_APPCACHE_HOST_H_
#include "base/callback.h"
#include "base/gtest_prod_util.h"
#include "base/observer_list.h"
#include "base/ref_counted.h"
#include "googleurl/src/gurl.h"
#include "webkit/appcache/appcache_group.h"
#include "webkit/appcache/appcache_interfaces.h"
#include "webkit/appcache/appcache_service.h"
#include "webkit/appcache/appcache_storage.h"
#include "webkit/glue/resource_type.h"
class URLRequest;
namespace appcache {
class AppCache;
class AppCacheFrontend;
class AppCacheRequestHandler;
typedef Callback2<Status, void*>::Type GetStatusCallback;
typedef Callback2<bool, void*>::Type StartUpdateCallback;
typedef Callback2<bool, void*>::Type SwapCacheCallback;
// Server-side representation of an application cache host.
class AppCacheHost : public AppCacheStorage::Delegate,
public AppCacheGroup::UpdateObserver {
public:
class Observer {
public:
// Called just after the cache selection algorithm completes.
virtual void OnCacheSelectionComplete(AppCacheHost* host) = 0;
// Called just prior to the instance being deleted.
virtual void OnDestructionImminent(AppCacheHost* host) = 0;
virtual ~Observer() {}
};
AppCacheHost(int host_id, AppCacheFrontend* frontend,
AppCacheService* service);
~AppCacheHost();
// Adds/removes an observer, the AppCacheHost does not take
// ownership of the observer.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Support for cache selection and scriptable method calls.
void SelectCache(const GURL& document_url,
const int64 cache_document_was_loaded_from,
const GURL& manifest_url);
void SelectCacheForWorker(int parent_process_id,
int parent_host_id);
void SelectCacheForSharedWorker(int64 appcache_id);
void MarkAsForeignEntry(const GURL& document_url,
int64 cache_document_was_loaded_from);
void GetStatusWithCallback(GetStatusCallback* callback,
void* callback_param);
void StartUpdateWithCallback(StartUpdateCallback* callback,
void* callback_param);
void SwapCacheWithCallback(SwapCacheCallback* callback,
void* callback_param);
// Support for loading resources out of the appcache.
// May return NULL if the request isn't subject to retrieval from an appache.
AppCacheRequestHandler* CreateRequestHandler(
URLRequest* request, ResourceType::Type resource_type);
// Support for devtools inspecting appcache resources.
void GetResourceList(std::vector<AppCacheResourceInfo>* resource_infos);
// Establishes an association between this host and a cache. 'cache' may be
// NULL to break any existing association. Associations are established
// either thru the cache selection algorithm implemented (in this class),
// or by the update algorithm (see AppCacheUpdateJob).
void AssociateCache(AppCache* cache);
// Adds a reference to the newest complete cache in a group, unless it's the
// same as the cache that is currently associated with the host.
void SetSwappableCache(AppCacheGroup* group);
// Used to ensure that a loaded appcache survives a frame navigation.
void LoadMainResourceCache(int64 cache_id);
// Used to notify the host that the main resource was blocked by a policy. To
// work properly, this method needs to by invoked prior to cache selection.
void NotifyMainResourceBlocked(const GURL& manifest_url);
// Used by the update job to keep track of which hosts are associated
// with which pending master entries.
const GURL& pending_master_entry_url() const {
return new_master_entry_url_;
}
int host_id() const { return host_id_; }
AppCacheService* service() const { return service_; }
AppCacheFrontend* frontend() const { return frontend_; }
AppCache* associated_cache() const { return associated_cache_.get(); }
bool is_selection_pending() const {
return pending_selected_cache_id_ != kNoCacheId ||
!pending_selected_manifest_url_.is_empty();
}
private:
Status GetStatus();
void LoadSelectedCache(int64 cache_id);
void LoadOrCreateGroup(const GURL& manifest_url);
// AppCacheStorage::Delegate impl
virtual void OnCacheLoaded(AppCache* cache, int64 cache_id);
virtual void OnGroupLoaded(AppCacheGroup* group,
const GURL& manifest_url);
void FinishCacheSelection(AppCache* cache, AppCacheGroup* group);
void DoPendingGetStatus();
void DoPendingStartUpdate();
void DoPendingSwapCache();
void ObserveGroupBeingUpdated(AppCacheGroup* group);
// AppCacheGroup::UpdateObserver methods.
virtual void OnContentBlocked(AppCacheGroup* group);
virtual void OnUpdateComplete(AppCacheGroup* group);
// Returns true if this host is for a dedicated worker context.
bool is_for_dedicated_worker() const {
return parent_host_id_ != kNoHostId;
}
// Returns the parent context's host instance. This is only valid
// to call when this instance is_for_dedicated_worker.
AppCacheHost* GetParentAppCacheHost() const;
// Identifies the corresponding appcache host in the child process.
int host_id_;
// Hosts for dedicated workers are special cased to shunt
// request handling off to the dedicated worker's parent.
// The scriptable api is not accessible in dedicated workers
// so the other aspects of this class are not relevant for
// these special case instances.
int parent_host_id_;
int parent_process_id_;
// The cache associated with this host, if any.
scoped_refptr<AppCache> associated_cache_;
// Hold a reference to the newest complete cache (if associated cache is
// not the newest) to keep the newest cache in existence while the app cache
// group is in use. The newest complete cache may have no associated hosts
// holding any references to it and would otherwise be deleted prematurely.
scoped_refptr<AppCache> swappable_cache_;
// Keep a reference to the group being updated until the update completes.
scoped_refptr<AppCacheGroup> group_being_updated_;
// Similarly, keep a reference to the newest cache of the group until the
// update completes. When adding a new master entry to a cache that is not
// in use in any other host, this reference keeps the cache in memory.
scoped_refptr<AppCache> newest_cache_of_group_being_updated_;
// Keep a reference to the cache of the main resource so it survives frame
// navigations.
scoped_refptr<AppCache> main_resource_cache_;
int64 pending_main_resource_cache_id_;
// Cache loading is async, if we're loading a specific cache or group
// for the purposes of cache selection, one or the other of these will
// indicate which cache or group is being loaded.
int64 pending_selected_cache_id_;
GURL pending_selected_manifest_url_;
// A new master entry to be added to the cache, may be empty.
GURL new_master_entry_url_;
// The frontend proxy to deliver notifications to the child process.
AppCacheFrontend* frontend_;
// Our central service object.
AppCacheService* service_;
// Since these are synchronous scriptable api calls in the client,
// there can only be one type of callback pending.
// Also, we have to wait until we have a cache selection prior
// to responding to these calls, as cache selection involves
// async loading of a cache or a group from storage.
GetStatusCallback* pending_get_status_callback_;
StartUpdateCallback* pending_start_update_callback_;
SwapCacheCallback* pending_swap_cache_callback_;
void* pending_callback_param_;
// True if requests for this host were blocked by a policy.
bool main_resource_blocked_;
GURL blocked_manifest_url_;
// Tells if info about associated cache is pending. Info is pending
// when update job has not returned success yet.
bool associated_cache_info_pending_;
// List of objects observing us.
ObserverList<Observer> observers_;
friend class AppCacheRequestHandlerTest;
friend class AppCacheUpdateJobTest;
FRIEND_TEST_ALL_PREFIXES(AppCacheTest, CleanupUnusedCache);
FRIEND_TEST_ALL_PREFIXES(AppCacheGroupTest, CleanupUnusedGroup);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, Basic);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, SelectNoCache);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, ForeignEntry);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, FailedCacheLoad);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, FailedGroupLoad);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, SetSwappableCache);
FRIEND_TEST_ALL_PREFIXES(AppCacheHostTest, ForDedicatedWorker);
FRIEND_TEST_ALL_PREFIXES(AppCacheGroupTest, QueueUpdate);
DISALLOW_COPY_AND_ASSIGN(AppCacheHost);
};
} // namespace appcache
#endif // WEBKIT_APPCACHE_APPCACHE_HOST_H_