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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/ui/webui/memory_internals/memory_internals_handler.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/bind.h"
     10 #include "base/bind_helpers.h"
     11 #include "base/strings/string16.h"
     12 #include "base/values.h"
     13 #include "chrome/browser/ui/webui/memory_internals/memory_internals_proxy.h"
     14 #include "content/public/browser/browser_thread.h"
     15 #include "content/public/browser/render_view_host.h"
     16 #include "content/public/browser/web_contents.h"
     17 #include "content/public/browser/web_ui.h"
     18 
     19 MemoryInternalsHandler::MemoryInternalsHandler()
     20     : proxy_(new MemoryInternalsProxy()) {}
     21 
     22 MemoryInternalsHandler::~MemoryInternalsHandler() {
     23   proxy_->Detach();
     24 }
     25 
     26 void MemoryInternalsHandler::RegisterMessages() {
     27   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
     28   proxy_->Attach(this);
     29 
     30   // Set callback functions called by JavaScript messages.
     31   web_ui()->RegisterMessageCallback(
     32       "update",
     33       base::Bind(&MemoryInternalsHandler::OnJSUpdate,
     34                  base::Unretained(this)));
     35 }
     36 
     37 void MemoryInternalsHandler::OnJSUpdate(const base::ListValue* list) {
     38   proxy_->StartFetch(list);
     39 }
     40 
     41 void MemoryInternalsHandler::OnUpdate(const string16& update) {
     42   // Don't try to execute JavaScript in a RenderView that no longer exists.
     43   content::RenderViewHost* host =
     44       web_ui()->GetWebContents()->GetRenderViewHost();
     45   if (host)
     46     host->ExecuteJavascriptInWebFrame(string16(), update);
     47 }
     48