trace_net_log_observer.h 1.7 KB

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  1. // Copyright 2014 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. #ifndef NET_LOG_TRACE_NET_LOG_OBSERVER_H_
  5. #define NET_LOG_TRACE_NET_LOG_OBSERVER_H_
  6. #include "base/memory/raw_ptr.h"
  7. #include "base/memory/weak_ptr.h"
  8. #include "base/trace_event/trace_log.h"
  9. #include "net/base/net_export.h"
  10. #include "net/log/net_log.h"
  11. namespace net {
  12. // TraceNetLogObserver watches for TraceLog enable, and sends NetLog
  13. // events to TraceLog if it is enabled.
  14. class NET_EXPORT TraceNetLogObserver
  15. : public NetLog::ThreadSafeObserver,
  16. public base::trace_event::TraceLog::AsyncEnabledStateObserver {
  17. public:
  18. TraceNetLogObserver();
  19. TraceNetLogObserver(const TraceNetLogObserver&) = delete;
  20. TraceNetLogObserver& operator=(const TraceNetLogObserver&) = delete;
  21. ~TraceNetLogObserver() override;
  22. // net::NetLog::ThreadSafeObserver implementation:
  23. void OnAddEntry(const NetLogEntry& entry) override;
  24. // Start to watch for TraceLog enable and disable events.
  25. // This can't be called if already watching for events.
  26. // Watches NetLog only when tracing is enabled.
  27. void WatchForTraceStart(NetLog* net_log);
  28. // Stop watching for TraceLog enable and disable events.
  29. // If WatchForTraceStart is called, this must be called before
  30. // TraceNetLogObserver is destroyed.
  31. void StopWatchForTraceStart();
  32. // base::trace_event::TraceLog::EnabledStateChangedObserver implementation:
  33. void OnTraceLogEnabled() override;
  34. void OnTraceLogDisabled() override;
  35. private:
  36. raw_ptr<NetLog> net_log_to_watch_ = nullptr;
  37. base::WeakPtrFactory<TraceNetLogObserver> weak_factory_{this};
  38. };
  39. } // namespace net
  40. #endif // NET_LOG_TRACE_NET_LOG_OBSERVER_H_