15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This file provides support for basic in-memory tracing of short events. We 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// keep a static circular buffer where we store the last traced events, so we 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// can review the cache recent behavior should we need it. 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#ifndef NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 10a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#define NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/ref_counted.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/net_export.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace disk_cache { 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Create and destroy the tracing buffer. 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void InitTrace(void); 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void DestroyTrace(void); 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Simple class to handle the trace buffer lifetime. Any object interested in 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// tracing should keep a reference to the object returned by GetTraceObject(). 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class TraceObject : public base::RefCounted<TraceObject> { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) friend class base::RefCounted<TraceObject>; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static TraceObject* GetTraceObject(); 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void EnableTracing(bool enable); 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TraceObject(); 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~TraceObject(); 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(TraceObject); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Traces to the internal buffer. 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)NET_EXPORT_PRIVATE void Trace(const char* format, ...); 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace disk_cache 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 41a1401311d1ab56c4ed0a474bd38c108f75cb0cd9Torne (Richard Coles)#endif // NET_DISK_CACHE_BLOCKFILE_TRACE_H_ 42