Revert 156846 - Http Cache: Add code for simulating an infinite HTTP cache.

net/http/infinite_cache.h

-// Copyright (c) 2012 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.
-
-// This is the interface of a simulated infinite cache. The purpose of this
-// code is to evaluate the performance of an HTTP cache that is not constrained
-// to evict resources.
-
-#ifndef NET_HTTP_INFINITE_CACHE_H_
-#define NET_HTTP_INFINITE_CACHE_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/timer.h"
-#include "net/base/completion_callback.h"
-#include "net/base/net_export.h"
-
-class FilePath;
-
-namespace base {
-class SequencedTaskRunner;
-class SequencedWorkerPool;
-}
-
-namespace net {
-
-class HttpCache;
-class HttpResponseInfo;
-class InfiniteCache;
-struct HttpRequestInfo;
-
-// An InfiniteCacheTransaction is paired with an HttpCache::Transaction to track
-// every request that goes through the HttpCache. This object is notified when
-// relevant steps are reached while processing the request.
-class NET_EXPORT_PRIVATE InfiniteCacheTransaction {
- public:
-  explicit InfiniteCacheTransaction(InfiniteCache* cache);
-  ~InfiniteCacheTransaction();
-
-  // Called when a new HttpTransaction is started.
-  void OnRequestStart(const HttpRequestInfo* request);
-
-  // Called when the response headers are available.
-  void OnResponseReceived(const HttpResponseInfo* response);
-
-  // Called when the response data is received from the network.
-  void OnDataRead(const char* data, int data_len);
-
-  // Called when the resource is marked as truncated by the HttpCache.
-  void OnTruncatedResponse();
-
-  // Called when the resource is served from the cache, so OnDataRead will not
-  // be called for this request.
-  void OnServedFromCache();
-
- private:
-  friend class InfiniteCache;
-  struct ResourceData;
-  void Finish();
-
-  base::WeakPtr<InfiniteCache> cache_;
-  scoped_ptr<ResourceData> resource_data_;
-  bool must_doom_entry_;
-  DISALLOW_COPY_AND_ASSIGN(InfiniteCacheTransaction);
-};
-
-// An InfiniteCache is paired with an HttpCache instance to simulate an infinite
-// backend storage.
-class NET_EXPORT_PRIVATE InfiniteCache
-    : public base::SupportsWeakPtr<InfiniteCache> {
- public:
-  InfiniteCache();
-  ~InfiniteCache();
-
-  // Initializes this object to start tracking requests. |path| is the location
-  // of the file to use to store data; it can be empty, in which case the data
-  // will not be persisted to disk.
-  void Init(const FilePath& path);
-
-  InfiniteCacheTransaction* CreateInfiniteCacheTransaction();
-
-  // Removes all data for this experiment. Returns a net error code.
-  int DeleteData(const CompletionCallback& callback);
-
-  // Removes requests between |initial_time| and |end_time|.
-  int DeleteDataBetween(base::Time initial_time,
-                        base::Time end_time,
-                        const CompletionCallback& callback);
-
-  // Returns the number of elements currently tracked.
-  int QueryItemsForTest(const CompletionCallback& callback);
-
-  // Flush the data to disk, preventing flushing when the destructor runs. Any
-  // data added to the cache after calling this method will not be written to
-  // disk, unless this method is called again to do so.
-  int FlushDataForTest(const CompletionCallback& callback);
-
- private:
-  class Worker;
-  friend class base::RepeatingTimer<InfiniteCache>;
-  friend class InfiniteCacheTransaction;
-
-  std::string GenerateKey(const HttpRequestInfo* request);
-  void ProcessResource(scoped_ptr<InfiniteCacheTransaction::ResourceData> data);
-  void OnTimer();
-
-  scoped_refptr<Worker> worker_;
-  scoped_refptr<base::SequencedWorkerPool> worker_pool_;
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  base::RepeatingTimer<InfiniteCache> timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(InfiniteCache);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_INFINITE_CACHE_H_