Add content/browser/loader/ for resource loading related classes.

content/browser/renderer_host/resource_handler.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 browser side of the resource dispatcher, it receives requests
-// from the RenderProcessHosts, and dispatches them to URLRequests. It then
-// fowards the messages from the URLRequests back to the correct process for
-// handling.
-//
-// See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
-
-#ifndef CONTENT_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
-#define CONTENT_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
-
-#include <string>
-
-#include "base/sequenced_task_runner_helpers.h"
-#include "base/threading/non_thread_safe.h"
-#include "content/common/content_export.h"
-#include "content/public/browser/browser_thread.h"
-
-class GURL;
-
-namespace net {
-class IOBuffer;
-class URLRequestStatus;
-}  // namespace net
-
-namespace content {
-class ResourceController;
-struct ResourceResponse;
-
-// The resource dispatcher host uses this interface to process network events
-// for an URLRequest instance.  A ResourceHandler's lifetime is bound to its
-// associated URLRequest.
-class CONTENT_EXPORT ResourceHandler
-    : public NON_EXPORTED_BASE(base::NonThreadSafe) {
- public:
-  virtual ~ResourceHandler() {}
-
-  // Sets the controller for this handler.
-  virtual void SetController(ResourceController* controller);
-
-  // Called as upload progress is made.  The return value is ignored.
-  virtual bool OnUploadProgress(int request_id,
-                                uint64 position,
-                                uint64 size) = 0;
-
-  // The request was redirected to a new URL.  |*defer| has an initial value of
-  // false.  Set |*defer| to true to defer the redirect.  The redirect may be
-  // followed later on via ResourceDispatcherHost::FollowDeferredRedirect.  If
-  // the handler returns false, then the request is cancelled.
-  virtual bool OnRequestRedirected(int request_id, const GURL& url,
-                                   ResourceResponse* response,
-                                   bool* defer) = 0;
-
-  // Response headers and meta data are available.  If the handler returns
-  // false, then the request is cancelled.  Set |*defer| to true to defer
-  // processing of the response.  Call ResourceDispatcherHostImpl::
-  // ResumeDeferredRequest to continue processing the response.
-  virtual bool OnResponseStarted(int request_id,
-                                 ResourceResponse* response,
-                                 bool* defer) = 0;
-
-  // Called before the net::URLRequest for |request_id| (whose url is |url|) is
-  // to be started.  If the handler returns false, then the request is
-  // cancelled.  Otherwise if the return value is true, the ResourceHandler can
-  // delay the request from starting by setting |*defer = true|.  A deferred
-  // request will not have called net::URLRequest::Start(), and will not resume
-  // until someone calls ResourceDispatcherHost::StartDeferredRequest().
-  virtual bool OnWillStart(int request_id, const GURL& url, bool* defer) = 0;
-
-  // Data will be read for the response.  Upon success, this method places the
-  // size and address of the buffer where the data is to be written in its
-  // out-params.  This call will be followed by either OnReadCompleted or
-  // OnResponseCompleted, at which point the buffer may be recycled.
-  //
-  // If the handler returns false, then the request is cancelled.  Otherwise,
-  // once data is available, OnReadCompleted will be called.
-  virtual bool OnWillRead(int request_id,
-                          net::IOBuffer** buf,
-                          int* buf_size,
-                          int min_size) = 0;
-
-  // Data (*bytes_read bytes) was written into the buffer provided by
-  // OnWillRead.  A return value of false cancels the request, true continues
-  // reading data.  Set |*defer| to true to defer reading more response data.
-  // Call ResourceDispatcherHostImpl::ResumeDeferredRequest to continue reading
-  // response data.
-  virtual bool OnReadCompleted(int request_id, int bytes_read,
-                               bool* defer) = 0;
-
-  // The response is complete.  The final response status is given.  Returns
-  // false if the handler is deferring the call to a later time.  Otherwise,
-  // the request will be destroyed upon return.
-  virtual bool OnResponseCompleted(int request_id,
-                                   const net::URLRequestStatus& status,
-                                   const std::string& security_info) = 0;
-
-  // This notification is synthesized by the RedirectToFileResourceHandler
-  // to indicate progress of 'download_to_file' requests. OnReadCompleted
-  // calls are consumed by the RedirectToFileResourceHandler and replaced
-  // with OnDataDownloaded calls.
-  virtual void OnDataDownloaded(int request_id, int bytes_downloaded) {}
-
- protected:
-  ResourceHandler() : controller_(NULL) {}
-  ResourceController* controller() { return controller_; }
-
- private:
-  ResourceController* controller_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_