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// This file provides support for basic in-memory tracing of short events. We 6// keep a static circular buffer where we store the last traced events, so we 7// can review the cache recent behavior should we need it. 8 9#ifndef NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 10#define NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 11 12#include "base/basictypes.h" 13#include "base/memory/ref_counted.h" 14#include "net/base/net_export.h" 15 16namespace disk_cache { 17 18// Create and destroy the tracing buffer. 19void InitTrace(void); 20void DestroyTrace(void); 21 22// Simple class to handle the trace buffer lifetime. Any object interested in 23// tracing should keep a reference to the object returned by GetTraceObject(). 24class TraceObject : public base::RefCounted<TraceObject> { 25 friend class base::RefCounted<TraceObject>; 26 public: 27 static TraceObject* GetTraceObject(); 28 void EnableTracing(bool enable); 29 30 private: 31 TraceObject(); 32 ~TraceObject(); 33 DISALLOW_COPY_AND_ASSIGN(TraceObject); 34}; 35 36// Traces to the internal buffer. 37NET_EXPORT_PRIVATE void Trace(const char* format, ...); 38 39} // namespace disk_cache 40 41#endif // NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 42