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// Copyright (c) 2009 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 "webkit/appcache/appcache_group.h"
#include <algorithm>
#include "base/logging.h"
#include "base/message_loop.h"
#include "webkit/appcache/appcache.h"
#include "webkit/appcache/appcache_host.h"
#include "webkit/appcache/appcache_service.h"
#include "webkit/appcache/appcache_storage.h"
#include "webkit/appcache/appcache_update_job.h"
namespace appcache {
class AppCacheGroup;
// Use this helper class because we cannot make AppCacheGroup a derived class
// of AppCacheHost::Observer as it would create a circular dependency between
// AppCacheHost and AppCacheGroup.
class AppCacheGroup::HostObserver : public AppCacheHost::Observer {
public:
explicit HostObserver(AppCacheGroup* group) : group_(group) {}
// Methods for AppCacheHost::Observer.
void OnCacheSelectionComplete(AppCacheHost* host) {} // N/A
void OnDestructionImminent(AppCacheHost* host) {
group_->HostDestructionImminent(host);
}
private:
AppCacheGroup* group_;
};
AppCacheGroup::AppCacheGroup(AppCacheService* service,
const GURL& manifest_url,
int64 group_id)
: group_id_(group_id),
manifest_url_(manifest_url),
update_status_(IDLE),
is_obsolete_(false),
newest_complete_cache_(NULL),
update_job_(NULL),
service_(service),
restart_update_task_(NULL) {
service_->storage()->working_set()->AddGroup(this);
host_observer_.reset(new HostObserver(this));
}
AppCacheGroup::~AppCacheGroup() {
DCHECK(old_caches_.empty());
DCHECK(!newest_complete_cache_);
DCHECK(!restart_update_task_);
DCHECK(queued_updates_.empty());
if (update_job_)
delete update_job_;
DCHECK_EQ(IDLE, update_status_);
service_->storage()->working_set()->RemoveGroup(this);
}
void AppCacheGroup::AddUpdateObserver(UpdateObserver* observer) {
// If observer being added is a host that has been queued for later update,
// add observer to a different observer list.
AppCacheHost* host = static_cast<AppCacheHost*>(observer);
if (queued_updates_.find(host) != queued_updates_.end())
queued_observers_.AddObserver(observer);
else
observers_.AddObserver(observer);
}
void AppCacheGroup::RemoveUpdateObserver(UpdateObserver* observer) {
observers_.RemoveObserver(observer);
queued_observers_.RemoveObserver(observer);
}
void AppCacheGroup::AddCache(AppCache* complete_cache) {
DCHECK(complete_cache->is_complete());
complete_cache->set_owning_group(this);
if (!newest_complete_cache_) {
newest_complete_cache_ = complete_cache;
return;
}
if (complete_cache->IsNewerThan(newest_complete_cache_)) {
old_caches_.push_back(newest_complete_cache_);
newest_complete_cache_ = complete_cache;
// Update hosts of older caches to add a reference to the newest cache.
for (Caches::iterator it = old_caches_.begin();
it != old_caches_.end(); ++it) {
AppCache::AppCacheHosts& hosts = (*it)->associated_hosts();
for (AppCache::AppCacheHosts::iterator host_it = hosts.begin();
host_it != hosts.end(); ++host_it) {
(*host_it)->SetSwappableCache(this);
}
}
} else {
old_caches_.push_back(complete_cache);
}
}
void AppCacheGroup::RemoveCache(AppCache* cache) {
DCHECK(cache->associated_hosts().empty());
if (cache == newest_complete_cache_) {
AppCache* tmp_cache = newest_complete_cache_;
newest_complete_cache_ = NULL;
tmp_cache->set_owning_group(NULL); // may cause this group to be deleted
} else {
Caches::iterator it =
std::find(old_caches_.begin(), old_caches_.end(), cache);
if (it != old_caches_.end()) {
AppCache* tmp_cache = *it;
old_caches_.erase(it);
tmp_cache->set_owning_group(NULL); // may cause group to be deleted
}
}
}
void AppCacheGroup::StartUpdateWithNewMasterEntry(
AppCacheHost* host, const GURL& new_master_resource) {
if (!update_job_)
update_job_ = new AppCacheUpdateJob(service_, this);
update_job_->StartUpdate(host, new_master_resource);
// Run queued update immediately as an update has been started manually.
if (restart_update_task_) {
restart_update_task_->Cancel();
restart_update_task_ = NULL;
RunQueuedUpdates();
}
}
void AppCacheGroup::QueueUpdate(AppCacheHost* host,
const GURL& new_master_resource) {
DCHECK(update_job_ && host && !new_master_resource.is_empty());
queued_updates_.insert(QueuedUpdates::value_type(host, new_master_resource));
// Need to know when host is destroyed.
host->AddObserver(host_observer_.get());
// If host is already observing for updates, move host to queued observers
// list so that host is not notified when the current update completes.
if (FindObserver(host, observers_)) {
observers_.RemoveObserver(host);
queued_observers_.AddObserver(host);
}
}
void AppCacheGroup::RunQueuedUpdates() {
if (restart_update_task_)
restart_update_task_ = NULL;
if (queued_updates_.empty())
return;
QueuedUpdates updates_to_run;
queued_updates_.swap(updates_to_run);
DCHECK(queued_updates_.empty());
for (QueuedUpdates::iterator it = updates_to_run.begin();
it != updates_to_run.end(); ++it) {
AppCacheHost* host = it->first;
host->RemoveObserver(host_observer_.get());
if (FindObserver(host, queued_observers_)) {
queued_observers_.RemoveObserver(host);
observers_.AddObserver(host);
}
if (!is_obsolete())
StartUpdateWithNewMasterEntry(host, it->second);
}
}
bool AppCacheGroup::FindObserver(UpdateObserver* find_me,
const ObserverList<UpdateObserver>& observer_list) {
ObserverList<UpdateObserver>::Iterator it(observer_list);
UpdateObserver* obs;
while ((obs = it.GetNext()) != NULL) {
if (obs == find_me)
return true;
}
return false;
}
void AppCacheGroup::ScheduleUpdateRestart(int delay_ms) {
DCHECK(!restart_update_task_);
restart_update_task_ =
NewRunnableMethod(this, &AppCacheGroup::RunQueuedUpdates);
MessageLoop::current()->PostDelayedTask(FROM_HERE, restart_update_task_,
delay_ms);
}
void AppCacheGroup::HostDestructionImminent(AppCacheHost* host) {
queued_updates_.erase(host);
if (queued_updates_.empty() && restart_update_task_) {
restart_update_task_->Cancel();
restart_update_task_ = NULL;
}
}
void AppCacheGroup::SetUpdateStatus(UpdateStatus status) {
if (status == update_status_)
return;
update_status_ = status;
if (status != IDLE) {
DCHECK(update_job_);
} else {
update_job_ = NULL;
// Check member variable before notifying observers about update finishing.
// Observers may remove reference to group, causing group to be deleted
// after the notifications. If there are queued updates, then the group
// will continue to exist.
bool restart_update = !queued_updates_.empty();
FOR_EACH_OBSERVER(UpdateObserver, observers_, OnUpdateComplete(this));
if (restart_update)
ScheduleUpdateRestart(kUpdateRestartDelayMs);
}
}
} // namespace appcache
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