Seculative resource prefetching for URLs CL.

chrome/browser/net/resource_prefetch_predictor_observer.cc

+// 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.
+
+#include "chrome/browser/net/resource_prefetch_predictor_observer.h"
+
+#include "content/public/browser/browser_thread.h"
+#include "net/url_request/url_request.h"
+
+using content::BrowserThread;
+using predictors::ResourcePrefetchPredictor;
+
+namespace chrome_browser_net {
+
+ResourcePrefetchPredictorObserver::ResourcePrefetchPredictorObserver(
+    scoped_refptr<ResourcePrefetchPredictor> predictor)
+        : predictor_(predictor) {
+  DCHECK(predictor_);
+}
+
+ResourcePrefetchPredictorObserver::~ResourcePrefetchPredictorObserver() {
+}
+
+void ResourcePrefetchPredictorObserver::OnBeforeURLRequest(
+    net::URLRequest* request) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (ResourcePrefetchPredictor::ShouldRecordRequest(request))
+    CallPredictorOnUIThread(request, false,
+                            &ResourcePrefetchPredictor::RecordURLRequest);
+}
+
+void ResourcePrefetchPredictorObserver::OnBeforeRedirect(
+    net::URLRequest* request) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (ResourcePrefetchPredictor::ShouldRecordRedirect(request))
+    CallPredictorOnUIThread(request, false,
+                            &ResourcePrefetchPredictor::RecordUrlRedirect);
+}
+
+void ResourcePrefetchPredictorObserver::OnResponseStarted(
+    net::URLRequest* request) {
+  CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (ResourcePrefetchPredictor::ShouldRecordResponse(request))
+    CallPredictorOnUIThread(request, true,
+                            &ResourcePrefetchPredictor::RecordUrlResponse);
+}
+
+void ResourcePrefetchPredictorObserver::CallPredictorOnUIThread(
+    net::URLRequest* request,
+    bool is_response,
+    void(predictors::ResourcePrefetchPredictor::*recordFunction)

[willchan no longer on Chromium, 2012/05/24 22:28:52]

recordFunction is not Chromium/Google naming style. Looks like WebKit :) Can you
fix?

[Shishir, 2012/05/30 01:07:51]

Done.

+    (const predictors::ResourcePrefetchPredictor::URLRequestSummary&)) const {
+  ResourcePrefetchPredictor::URLRequestSummary summary;
+  if (!summary.InitFromURLRequest(request, is_response))
+    return;
+
+  CHECK(predictor_.get());
+  BrowserThread::PostTask(BrowserThread::UI,

[willchan no longer on Chromium, 2012/05/24 22:28:52]

How is this safe if the Profile goes away? I know we only delete it right now
when the Profile is stopped, but what about when we fix
http://code.google.com/p/chromium/issues/detail?id=88586?

[Shishir, 2012/05/30 01:07:51]

Wont matter now since this is a weak ptr.

+                          FROM_HERE,
+                          base::Bind(recordFunction, predictor_, summary));
+}
+
+}  // namespace chrome_browser_net