content::ResourceDispatcherHostImpl changes for stale-while-revalidate

content/browser/loader/null_resource_handler.h

+// Copyright 2015 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 CONTENT_BROWSER_LOADER_NULL_RESOURCE_HANDLER_H_
+#define CONTENT_BROWSER_LOADER_NULL_RESOURCE_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time/time.h"
+#include "base/timer/timer.h"
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "content/browser/loader/resource_handler.h"
+
+namespace net {
+class IOBuffer;
+class URLRequest;
+}  // namespace net
+
+namespace content {
+
+class ResourceController;
+
+extern const int kNullResourceHandlerDefaultReadTimeoutSecs;
+
+// A ResourceHandler which reads the entire response and drops it on the
+// floor. It does not attempt to pass it to a child process (or even require a
+// child process to exist).
+class NullResourceHandler : public ResourceHandler {
+ public:
+  NullResourceHandler(net::URLRequest* request,
+                      ResourceDispatcherHostImpl* rdh,
+                      base::TimeDelta read_timeout);
+  ~NullResourceHandler() override;
+
+  // ResourceHandler implementation:
+  void SetController(ResourceController* controller) override;
+  bool OnUploadProgress(uint64 position, uint64 size) override;
+  bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
+                           ResourceResponse* response,
+                           bool* defer) override;
+  bool OnResponseStarted(ResourceResponse* response, bool* defer) override;
+  bool OnWillStart(const GURL& url, bool* defer) override;
+  bool OnBeforeNetworkStart(const GURL& url, bool* defer) override;
+  bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
+                  int* buf_size,
+                  int min_size) override;
+  bool OnReadCompleted(int bytes_read, bool* defer) override;
+  void OnResponseCompleted(const net::URLRequestStatus& status,
+                           const std::string& security_info,
+                           bool* defer) override;
+  void OnDataDownloaded(int bytes_downloaded) override;
+
+ private:
+  void OnReadTimeout();
+
+  scoped_refptr<net::IOBuffer> read_buffer_;
+  ResourceDispatcherHostImpl* rdh_;
+
+  // OneShotTimer does not permit passing the task to the constructor. Since
+  // that is convenient, use the base class instead
+  base::Timer read_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(NullResourceHandler);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_LOADER_NULL_RESOURCE_HANDLER_H_