| // Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_ |
| #define NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_ |
| |
| #include "base/memory/weak_ptr.h" |
| #include "net/disk_cache/disk_cache.h" |
| #include "net/disk_cache/stats.h" |
| |
| namespace disk_cache { |
| |
| class EntryProxy; |
| |
| // The TracingCacheBackend implements the Cache Backend interface. It intercepts |
| // all backend operations from the IO thread and records the time from the start |
| // of the operation until the result is delivered. |
| class NET_EXPORT TracingCacheBackend : public Backend, |
| public base::SupportsWeakPtr<TracingCacheBackend> { |
| public: |
| explicit TracingCacheBackend(scoped_ptr<Backend> backend); |
| |
| virtual net::CacheType GetCacheType() const OVERRIDE; |
| virtual int32 GetEntryCount() const OVERRIDE; |
| virtual int OpenEntry(const std::string& key, Entry** entry, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual int CreateEntry(const std::string& key, Entry** entry, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual int DoomEntry(const std::string& key, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE; |
| virtual int DoomEntriesBetween(base::Time initial_time, |
| base::Time end_time, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual int DoomEntriesSince(base::Time initial_time, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual int OpenNextEntry(void** iter, Entry** next_entry, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual void EndEnumeration(void** iter) OVERRIDE; |
| virtual void GetStats(StatsItems* stats) OVERRIDE; |
| virtual void OnExternalCacheHit(const std::string& key) OVERRIDE; |
| |
| private: |
| friend class EntryProxy; |
| enum Operation { |
| OP_OPEN, |
| OP_CREATE, |
| OP_DOOM_ENTRY, |
| OP_READ, |
| OP_WRITE |
| }; |
| |
| virtual ~TracingCacheBackend(); |
| |
| EntryProxy* FindOrCreateEntryProxy(Entry* entry); |
| |
| void OnDeleteEntry(Entry* e); |
| |
| void RecordEvent(base::TimeTicks start_time, Operation op, std::string key, |
| Entry* entry, int result); |
| |
| void BackendOpComplete(base::TimeTicks start_time, Operation op, |
| std::string key, Entry** entry, |
| const CompletionCallback& callback, int result); |
| |
| net::CompletionCallback BindCompletion(Operation op, |
| base::TimeTicks start_time, |
| const std::string& key, Entry **entry, |
| const net::CompletionCallback& cb); |
| |
| scoped_ptr<Backend> backend_; |
| typedef std::map<Entry*, EntryProxy*> EntryToProxyMap; |
| EntryToProxyMap open_entries_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TracingCacheBackend); |
| }; |
| |
| } // namespace disk_cache |
| |
| #endif // NET_DISK_CACHE_TRACING_CACHE_BACKEND_H_ |