1 // Copyright (c) 2006-2008 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 12 #include <string> 13 #include <vector> 14 15 #include "base/basictypes.h" 16 #include "base/ref_counted.h" 17 18 namespace disk_cache { 19 20 // Create and destroy the tracing buffer. 21 void InitTrace(void); 22 void DestroyTrace(void); 23 24 // Simple class to handle the trace buffer lifetime. Any object interested in 25 // tracing should keep a reference to the object returned by GetTraceObject(). 26 class TraceObject : public base::RefCounted<TraceObject> { 27 friend class base::RefCounted<TraceObject>; 28 public: 29 static TraceObject* GetTraceObject(); 30 31 private: TraceObject()32 TraceObject() { 33 InitTrace(); 34 } 35 ~TraceObject()36 ~TraceObject() { 37 DestroyTrace(); 38 } 39 DISALLOW_EVIL_CONSTRUCTORS(TraceObject); 40 }; 41 42 // Traces to the internal buffer. 43 void Trace(const char* format, ...); 44 45 } // namespace disk_cache 46 47 #endif // NET_DISK_CACHE_TRACE_H__ 48