Remove the tracing cache backend.

net/disk_cache/tracing/tracing_cache_backend.cc

Index: net/disk_cache/tracing/tracing_cache_backend.cc
diff --git a/net/disk_cache/tracing/tracing_cache_backend.cc b/net/disk_cache/tracing/tracing_cache_backend.cc
deleted file mode 100644
index 1efdb99963d3bfe13fdc4bba5471243a5a729c17..0000000000000000000000000000000000000000
--- a/net/disk_cache/tracing/tracing_cache_backend.cc
+++ /dev/null
@@ -1,317 +0,0 @@
-// 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.
-
-#include "net/disk_cache/tracing/tracing_cache_backend.h"
-
-#include "net/base/net_errors.h"
-
-namespace disk_cache {
-
-// Proxies entry objects created by the real underlying backend. Backend users
-// will only see the proxy entries. It is necessary for recording the backend
-// operations since often non-trivial work is invoked directly on entries.
-class EntryProxy : public Entry, public base::RefCountedThreadSafe<EntryProxy> {
- public:
-  EntryProxy(Entry *entry, TracingCacheBackend* backend);
-  virtual void Doom() OVERRIDE;
-  virtual void Close() OVERRIDE;
-  virtual std::string GetKey() const OVERRIDE;
-  virtual base::Time GetLastUsed() const OVERRIDE;
-  virtual base::Time GetLastModified() const OVERRIDE;
-  virtual int32 GetDataSize(int index) const OVERRIDE;
-  virtual int ReadData(int index, int offset, IOBuffer* buf, int buf_len,
-                       const CompletionCallback& callback) OVERRIDE;
-  virtual int WriteData(int index, int offset, IOBuffer* buf, int buf_len,
-                        const CompletionCallback& callback,
-                        bool truncate) OVERRIDE;
-  virtual int ReadSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                             const CompletionCallback& callback) OVERRIDE;
-  virtual int WriteSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                              const CompletionCallback& callback) OVERRIDE;
-  virtual int GetAvailableRange(int64 offset, int len, int64* start,
-                                const CompletionCallback& callback) OVERRIDE;
-  virtual bool CouldBeSparse() const OVERRIDE;
-  virtual void CancelSparseIO() OVERRIDE;
-  virtual int ReadyForSparseIO(const CompletionCallback& callback) OVERRIDE;
-
- private:
-  friend class base::RefCountedThreadSafe<EntryProxy>;
-  typedef TracingCacheBackend::Operation Operation;
-  virtual ~EntryProxy();
-
-  struct RwOpExtra {
-    int index;
-    int offset;
-    int buf_len;
-    bool truncate;
-  };
-
-  void RecordEvent(base::TimeTicks start_time, Operation op, RwOpExtra extra,
-                   int result_to_record);
-  void EntryOpComplete(base::TimeTicks start_time, Operation op,
-                       RwOpExtra extra, const CompletionCallback& cb,
-                       int result);
-  Entry* entry_;
-  base::WeakPtr<TracingCacheBackend> backend_;
-
-  DISALLOW_COPY_AND_ASSIGN(EntryProxy);
-};
-
-EntryProxy::EntryProxy(Entry *entry, TracingCacheBackend* backend)
-  : entry_(entry),
-    backend_(backend->AsWeakPtr()) {
-}
-
-void EntryProxy::Doom() {
-  // TODO(pasko): Record the event.
-  entry_->Doom();
-}
-
-void EntryProxy::Close() {
-  // TODO(pasko): Record the event.
-  entry_->Close();
-  Release();
-}
-
-std::string EntryProxy::GetKey() const {
-  return entry_->GetKey();
-}
-
-base::Time EntryProxy::GetLastUsed() const {
-  return entry_->GetLastUsed();
-}
-
-base::Time EntryProxy::GetLastModified() const {
-  return entry_->GetLastModified();
-}
-
-int32 EntryProxy::GetDataSize(int index) const {
-  return entry_->GetDataSize(index);
-}
-
-int EntryProxy::ReadData(int index, int offset, IOBuffer* buf, int buf_len,
-                         const CompletionCallback& callback) {
-  base::TimeTicks start_time = base::TimeTicks::Now();
-  RwOpExtra extra;
-  extra.index = index;
-  extra.offset = offset;
-  extra.buf_len = buf_len;
-  extra.truncate = false;
-  int rv = entry_->ReadData(
-      index, offset, buf, buf_len,
-      base::Bind(&EntryProxy::EntryOpComplete, this, start_time,
-                 TracingCacheBackend::OP_READ, extra, callback));
-  if (rv != net::ERR_IO_PENDING) {
-    RecordEvent(start_time, TracingCacheBackend::OP_READ, extra, rv);
-  }
-  return rv;
-}
-
-int EntryProxy::WriteData(int index, int offset, IOBuffer* buf, int buf_len,
-                      const CompletionCallback& callback,
-                      bool truncate) {
-  base::TimeTicks start_time = base::TimeTicks::Now();
-  RwOpExtra extra;
-  extra.index = index;
-  extra.offset = offset;
-  extra.buf_len = buf_len;
-  extra.truncate = truncate;
-  int rv = entry_->WriteData(index, offset, buf, buf_len,
-      base::Bind(&EntryProxy::EntryOpComplete, this, start_time,
-                 TracingCacheBackend::OP_WRITE, extra, callback),
-      truncate);
-  if (rv != net::ERR_IO_PENDING) {
-    RecordEvent(start_time, TracingCacheBackend::OP_WRITE, extra, rv);
-  }
-  return rv;
-}
-
-int EntryProxy::ReadSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                           const CompletionCallback& callback) {
-  // TODO(pasko): Record the event.
-  return entry_->ReadSparseData(offset, buf, buf_len, callback);
-}
-
-int EntryProxy::WriteSparseData(int64 offset, IOBuffer* buf, int buf_len,
-                            const CompletionCallback& callback) {
-  // TODO(pasko): Record the event.
-  return entry_->WriteSparseData(offset, buf, buf_len, callback);
-}
-
-int EntryProxy::GetAvailableRange(int64 offset, int len, int64* start,
-                              const CompletionCallback& callback) {
-  return entry_->GetAvailableRange(offset, len, start, callback);
-}
-
-bool EntryProxy::CouldBeSparse() const {
-  return entry_->CouldBeSparse();
-}
-
-void EntryProxy::CancelSparseIO() {
-  return entry_->CancelSparseIO();
-}
-
-int EntryProxy::ReadyForSparseIO(const CompletionCallback& callback) {
-  return entry_->ReadyForSparseIO(callback);
-}
-
-void EntryProxy::RecordEvent(base::TimeTicks start_time, Operation op,
-                             RwOpExtra extra, int result_to_record) {
-  // TODO(pasko): Implement.
-}
-
-void EntryProxy::EntryOpComplete(base::TimeTicks start_time, Operation op,
-                                 RwOpExtra extra, const CompletionCallback& cb,
-                                 int result) {
-  RecordEvent(start_time, op, extra, result);
-  if (!cb.is_null()) {
-    cb.Run(result);
-  }
-}
-
-EntryProxy::~EntryProxy() {
-  if (backend_.get()) {
-    backend_->OnDeleteEntry(entry_);
-  }
-}
-
-TracingCacheBackend::TracingCacheBackend(scoped_ptr<Backend> backend)
-  : backend_(backend.Pass()) {
-}
-
-TracingCacheBackend::~TracingCacheBackend() {
-}
-
-net::CacheType TracingCacheBackend::GetCacheType() const {
-  return backend_->GetCacheType();
-}
-
-int32 TracingCacheBackend::GetEntryCount() const {
-  return backend_->GetEntryCount();
-}
-
-void TracingCacheBackend::RecordEvent(base::TimeTicks start_time, Operation op,
-                                      std::string key, Entry* entry, int rv) {
-  // TODO(pasko): Implement.
-}
-
-EntryProxy* TracingCacheBackend::FindOrCreateEntryProxy(Entry* entry) {
-  EntryProxy* entry_proxy;
-  EntryToProxyMap::iterator it = open_entries_.find(entry);
-  if (it != open_entries_.end()) {
-    entry_proxy = it->second;
-    entry_proxy->AddRef();
-    return entry_proxy;
-  }
-  entry_proxy = new EntryProxy(entry, this);
-  entry_proxy->AddRef();
-  open_entries_[entry] = entry_proxy;
-  return entry_proxy;
-}
-
-void TracingCacheBackend::OnDeleteEntry(Entry* entry) {
-  EntryToProxyMap::iterator it = open_entries_.find(entry);
-  if (it != open_entries_.end()) {
-    open_entries_.erase(it);
-  }
-}
-
-void TracingCacheBackend::BackendOpComplete(base::TimeTicks start_time,
-                                            Operation op,
-                                            std::string key,
-                                            Entry** entry,
-                                            const CompletionCallback& callback,
-                                            int result) {
-  RecordEvent(start_time, op, key, *entry, result);
-  if (*entry) {
-    *entry = FindOrCreateEntryProxy(*entry);
-  }
-  if (!callback.is_null()) {
-    callback.Run(result);
-  }
-}
-
-net::CompletionCallback TracingCacheBackend::BindCompletion(
-    Operation op, base::TimeTicks start_time, const std::string& key,
-    Entry **entry, const net::CompletionCallback& cb) {
-  return base::Bind(&TracingCacheBackend::BackendOpComplete,
-                    AsWeakPtr(), start_time, op, key, entry, cb);
-}
-
-int TracingCacheBackend::OpenEntry(const std::string& key, Entry** entry,
-                                   const CompletionCallback& callback) {
-  DCHECK(*entry == NULL);
-  base::TimeTicks start_time = base::TimeTicks::Now();
-  int rv = backend_->OpenEntry(key, entry,
-                               BindCompletion(OP_OPEN, start_time, key, entry,
-                                              callback));
-  if (rv != net::ERR_IO_PENDING) {
-    RecordEvent(start_time, OP_OPEN, key, *entry, rv);
-    if (*entry) {
-      *entry = FindOrCreateEntryProxy(*entry);
-    }
-  }
-  return rv;
-}
-
-int TracingCacheBackend::CreateEntry(const std::string& key, Entry** entry,
-                                     const CompletionCallback& callback) {
-  base::TimeTicks start_time = base::TimeTicks::Now();
-  int rv = backend_->CreateEntry(key, entry,
-                                 BindCompletion(OP_CREATE, start_time, key,
-                                                entry, callback));
-  if (rv != net::ERR_IO_PENDING) {
-    RecordEvent(start_time, OP_CREATE, key, *entry, rv);
-    if (*entry) {
-      *entry = FindOrCreateEntryProxy(*entry);
-    }
-  }
-  return rv;
-}
-
-int TracingCacheBackend::DoomEntry(const std::string& key,
-                                   const CompletionCallback& callback) {
-  base::TimeTicks start_time = base::TimeTicks::Now();
-  int rv = backend_->DoomEntry(key, BindCompletion(OP_DOOM_ENTRY,
-                                                   start_time, key, NULL,
-                                                   callback));
-  if (rv != net::ERR_IO_PENDING) {
-    RecordEvent(start_time, OP_DOOM_ENTRY, key, NULL, rv);
-  }
-  return rv;
-}
-
-int TracingCacheBackend::DoomAllEntries(const CompletionCallback& callback) {
-  return backend_->DoomAllEntries(callback);
-}
-
-int TracingCacheBackend::DoomEntriesBetween(base::Time initial_time,
-                                            base::Time end_time,
-                                            const CompletionCallback& cb) {
-  return backend_->DoomEntriesBetween(initial_time, end_time, cb);
-}
-
-int TracingCacheBackend::DoomEntriesSince(base::Time initial_time,
-                                          const CompletionCallback& callback) {
-  return backend_->DoomEntriesSince(initial_time, callback);
-}
-
-int TracingCacheBackend::OpenNextEntry(void** iter, Entry** next_entry,
-                                       const CompletionCallback& callback) {
-  return backend_->OpenNextEntry(iter, next_entry, callback);
-}
-
-void TracingCacheBackend::EndEnumeration(void** iter) {
-  return backend_->EndEnumeration(iter);
-}
-
-void TracingCacheBackend::GetStats(StatsItems* stats) {
-  return backend_->GetStats(stats);
-}
-
-void TracingCacheBackend::OnExternalCacheHit(const std::string& key) {
-  return backend_->OnExternalCacheHit(key);
-}
-
-}  // namespace disk_cache