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// Copyright (c) 2011 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_WEB_RESOURCE_WEB_RESOURCE_SERVICE_H_
#define CHROME_BROWSER_WEB_RESOURCE_WEB_RESOURCE_SERVICE_H_
#pragma once
#include <string>
#include "content/browser/utility_process_host.h"
#include "content/public/browser/notification_types.h"
class PrefService;
class ResourceDispatcherHost;
namespace base {
class DictionaryValue;
}
// A WebResourceService fetches data from a web resource server and store
// locally as user preference.
class WebResourceService : public UtilityProcessHost::Client {
public:
// Pass notification_type = NOTIFICATION_TYPE_COUNT if notification is not
// required.
WebResourceService(PrefService* prefs,
const char* web_resource_server,
bool apply_locale_to_url_,
int notification_type,
const char* last_update_time_pref_name,
int start_fetch_delay,
int cache_update_delay);
// Sleep until cache needs to be updated, but always for at least 5 seconds
// so we don't interfere with startup. Then begin updating resources.
void StartAfterDelay();
// We have successfully pulled data from a resource server; now launch
// the process that will parse the JSON, and then update the cache.
void UpdateResourceCache(const std::string& json_data);
protected:
virtual ~WebResourceService();
virtual void Unpack(const base::DictionaryValue& parsed_json) = 0;
// If delay_ms is positive, schedule notification with the delay.
// If delay_ms is 0, notify immediately by calling WebResourceStateChange().
// If delay_ms is negative, do nothing.
void PostNotification(int64 delay_ms);
// We need to be able to load parsed resource data into preferences file,
// and get proper install directory.
PrefService* prefs_;
private:
class WebResourceFetcher;
friend class WebResourceFetcher;
class UnpackerClient;
// Set in_fetch_ to false, clean up temp directories (in the future).
void EndFetch();
// Puts parsed json data in the right places, and writes to prefs file.
void OnWebResourceUnpacked(const base::DictionaryValue& parsed_json);
// Notify listeners that the state of a web resource has changed.
void WebResourceStateChange();
scoped_ptr<WebResourceFetcher> web_resource_fetcher_;
ResourceDispatcherHost* resource_dispatcher_host_;
// Allows the creation of tasks to send a WEB_RESOURCE_STATE_CHANGED
// notification. This allows the WebResourceService to notify the New Tab
// Page immediately when a new web resource should be shown or removed.
ScopedRunnableMethodFactory<WebResourceService> service_factory_;
// True if we are currently mid-fetch. If we are asked to start a fetch
// when we are still fetching resource data, schedule another one in
// kCacheUpdateDelay time, and silently exit.
bool in_fetch_;
// URL that hosts the web resource.
const char* web_resource_server_;
// Indicates whether we should append locale to the web resource server URL.
bool apply_locale_to_url_;
// Notification type when an update is done.
int notification_type_;
// Pref name to store the last update's time.
const char* last_update_time_pref_name_;
// Delay on first fetch so we don't interfere with startup.
int start_fetch_delay_;
// Delay between calls to update the web resource cache. This delay may be
// different for different builds of Chrome.
int cache_update_delay_;
// True if a task has been set to update the cache when a new web resource
// becomes available.
bool web_resource_update_scheduled_;
DISALLOW_COPY_AND_ASSIGN(WebResourceService);
};
#endif // CHROME_BROWSER_WEB_RESOURCE_WEB_RESOURCE_SERVICE_H_
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