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-// 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_