This CL moves the different resource handlers from resource_dispatcher_host.cc into their own files, into a new renderer_host directory.

Their is no functionality change in this CL.

The motivation for doing that was:
- resource_dispatcher_host.cc has become very long and more than 1/3 of the code is for the resource handler.
- having the resource handler in their own file allows having unit tests for them.

BUG=none
TEST=run all unit tests and UI tests.
Review URL: http://codereview.chromium.org/14487

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7336 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 67 insertions, 0 deletions

diff --git a/chrome/browser/renderer_host/resource_handler.h b/chrome/browser/renderer_host/resource_handler.h
new file mode 100644
index 0000000..a6955c7
--- /dev/null
+++ b/chrome/browser/renderer_host/resource_handler.h
@@ -0,0 +1,67 @@
+// Copyright (c) 2006-2008 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 CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
+#define CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "base/ref_counted.h"
+#include "chrome/common/render_messages.h"
+#include "googleurl/src/gurl.h"
+#include "net/url_request/url_request.h"
+
+// Simple wrapper that refcounts ViewMsg_Resource_ResponseHead.
+struct ResourceResponse : public base::RefCounted<ResourceResponse> {
+  ViewMsg_Resource_ResponseHead response_head;
+};
+
+// The resource dispatcher host uses this interface to push load events to the
+// renderer, allowing for differences in the types of IPC messages generated.
+// See the implementations of this interface defined below.
+class ResourceHandler : public base::RefCounted<ResourceHandler> {
+ public:
+  virtual ~ResourceHandler() {}
+
+  // Called as upload progress is made.
+  virtual bool OnUploadProgress(int request_id,
+                                uint64 position,
+                                uint64 size) {
+    return true;
+  }
+
+  // The request was redirected to a new URL.
+  virtual bool OnRequestRedirected(int request_id, const GURL& url) = 0;
+
+  // Response headers and meta data are available.
+  virtual bool OnResponseStarted(int request_id,
+                                 ResourceResponse* response) = 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.
+  virtual bool OnWillRead(int request_id,
+                          char** 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.
+  virtual bool OnReadCompleted(int request_id, int* bytes_read) = 0;
+
+  // The response is complete.  The final response status is given.
+  // Returns false if the handler is deferring the call to a later time.
+  virtual bool OnResponseCompleted(int request_id,
+                                   const URLRequestStatus& status) = 0;
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_RESOURCE_HANDLER_H_