Dynamically refresh pref-configured proxies.

chrome/browser/net/pref_proxy_config_service.h

+// 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 CHROME_BROWSER_NET_PREF_PROXY_CONFIG_SERVICE_H_
+#define CHROME_BROWSER_NET_PREF_PROXY_CONFIG_SERVICE_H_
+
+#include "base/basictypes.h"
+#include "base/observer_list.h"
+#include "base/weak_ptr.h"
+#include "net/proxy/proxy_config.h"
+#include "net/proxy/proxy_config_service.h"
+
+class PrefService;
+class PrefProxyConfigTracker;
+
+// A net::ProxyConfigService implementation that applies preference proxy
+// settings as overrides to the proxy configuration determined by a baseline
+// delegate ProxyConfigService.
+class PrefProxyConfigService
+    : public net::ProxyConfigService,
+      public net::ProxyConfigService::Observer,
+      public base::SupportsWeakPtr<PrefProxyConfigService> {
+ public:
+  // Takes ownership of the passed |base_service|.
+  PrefProxyConfigService(PrefService* pref_service,
+                         net::ProxyConfigService* base_service);
+  virtual ~PrefProxyConfigService();
+
+  // ProxyConfigService implementation:
+  virtual void AddObserver(net::ProxyConfigService::Observer* observer);
+  virtual void RemoveObserver(net::ProxyConfigService::Observer* observer);
+  virtual bool GetLatestProxyConfig(net::ProxyConfig* config);
+  virtual void OnLazyPoll();
+
+ private:
+  class PrefProxyConfigTracker;
+
+  // ProxyConfigService::Observer implementation:
+  virtual void OnProxyConfigChanged(const net::ProxyConfig& config);
+
+  // Called by the tracker when a new policy configuration is available.
+  void PrefProxyConfigChanged();
+
+  scoped_ptr<net::ProxyConfigService> base_service_;
+  ObserverList<net::ProxyConfigService::Observer> observers_;
+  scoped_refptr<PrefProxyConfigTracker> pref_config_tracker_;
+
+  // Counter for assigning proxy configuration identifiers.
+  net::ProxyConfig::ID current_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefProxyConfigService);
+};
+
+#endif  // CHROME_BROWSER_NET_PREF_PROXY_CONFIG_SERVICE_H_