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_TRACE_H__ 10 #define NET_DISK_CACHE_TRACE_H__ 11 #pragma once 12 13 #include "base/basictypes.h" 14 #include "base/memory/ref_counted.h" 15 16 namespace disk_cache { 17 18 // Create and destroy the tracing buffer. 19 void InitTrace(void); 20 void 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(). 24 class TraceObject : public base::RefCounted<TraceObject> { 25 friend class base::RefCounted<TraceObject>; 26 public: 27 static TraceObject* GetTraceObject(); 28 29 private: 30 TraceObject(); 31 ~TraceObject(); 32 DISALLOW_COPY_AND_ASSIGN(TraceObject); 33 }; 34 35 // Traces to the internal buffer. 36 void Trace(const char* format, ...); 37 38 } // namespace disk_cache 39 40 #endif // NET_DISK_CACHE_TRACE_H__ 41