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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_PROXY_RESOLUTION_POLLING_PROXY_CONFIG_SERVICE_H_
#define NET_PROXY_RESOLUTION_POLLING_PROXY_CONFIG_SERVICE_H_
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
#include "net/proxy_resolution/proxy_config_service.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace net {
// PollingProxyConfigService is a base class for creating ProxyConfigService
// implementations that use polling to notice when settings have change.
//
// It runs code to get the current proxy settings on a background worker
// thread, and notifies registered observers when the value changes.
class NET_EXPORT_PRIVATE PollingProxyConfigService : public ProxyConfigService {
public:
PollingProxyConfigService(const PollingProxyConfigService&) = delete;
PollingProxyConfigService& operator=(const PollingProxyConfigService&) =
delete;
// ProxyConfigService implementation:
void AddObserver(Observer* observer) override;
void RemoveObserver(Observer* observer) override;
ConfigAvailability GetLatestProxyConfig(
ProxyConfigWithAnnotation* config) override;
void OnLazyPoll() override;
protected:
// Function for retrieving the current proxy configuration.
// Implementors must be threadsafe as the function will be invoked from
// worker threads.
typedef void (*GetConfigFunction)(NetworkTrafficAnnotationTag,
ProxyConfigWithAnnotation*);
// Creates a polling-based ProxyConfigService which will test for new
// settings at most every |poll_interval| time by calling |get_config_func|
// on a worker thread.
PollingProxyConfigService(
base::TimeDelta poll_interval,
GetConfigFunction get_config_func,
const NetworkTrafficAnnotationTag& traffic_annotation);
~PollingProxyConfigService() override;
// Polls for changes by posting a task to the worker pool.
void CheckForChangesNow();
private:
class Core;
scoped_refptr<Core> core_;
};
} // namespace net
#endif // NET_PROXY_RESOLUTION_POLLING_PROXY_CONFIG_SERVICE_H_
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