1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_PROXY_POLLING_PROXY_CONFIG_SERVICE_H_ 6 #define NET_PROXY_POLLING_PROXY_CONFIG_SERVICE_H_ 7 #pragma once 8 9 #include "base/memory/ref_counted.h" 10 #include "base/time.h" 11 #include "net/proxy/proxy_config_service.h" 12 13 namespace net { 14 15 // PollingProxyConfigService is a base class for creating ProxyConfigService 16 // implementations that use polling to notice when settings have change. 17 // 18 // It runs code to get the current proxy settings on a background worker 19 // thread, and notifies registered observers when the value changes. 20 class PollingProxyConfigService : public ProxyConfigService { 21 public: 22 // ProxyConfigService implementation: 23 virtual void AddObserver(Observer* observer); 24 virtual void RemoveObserver(Observer* observer); 25 virtual ConfigAvailability GetLatestProxyConfig(ProxyConfig* config); 26 virtual void OnLazyPoll(); 27 28 protected: 29 // Function for retrieving the current proxy configuration. 30 // Implementors must be threadsafe as the function will be invoked from 31 // worker threads. 32 typedef void (*GetConfigFunction)(ProxyConfig*); 33 34 // Creates a polling-based ProxyConfigService which will test for new 35 // settings at most every |poll_interval| time by calling |get_config_func| 36 // on a worker thread. 37 PollingProxyConfigService( 38 base::TimeDelta poll_interval, 39 GetConfigFunction get_config_func); 40 41 virtual ~PollingProxyConfigService(); 42 43 // Polls for changes by posting a task to the worker pool. 44 void CheckForChangesNow(); 45 46 private: 47 class Core; 48 scoped_refptr<Core> core_; 49 }; 50 51 } // namespace net 52 53 #endif // NET_PROXY_POLLING_PROXY_CONFIG_SERVICE_H_ 54