content/browser/renderer_host/pepper/pepper_lookup_request.h

   1 // Copyright (c) 2012 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 #ifndef CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_LOOKUP_REQUEST_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_LOOKUP_REQUEST_H_
   7
   8 #include "base/callback.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/profiler/scoped_tracker.h"
  11 #include "net/base/address_list.h"
  12 #include "net/base/net_errors.h"
  13 #include "net/dns/host_resolver.h"
  14 #include "net/dns/single_request_host_resolver.h"
  15
  16 namespace content {
  17
  18 template <class T>
  19 class PepperLookupRequest {
  20  public:
  21   typedef base::Callback<void(int, const net::AddressList&, const T&)>
  22       LookupRequestCallback;
  23
  24   // Takes ownership over |bound_info|. |bound_info| will be passed to
  25   // callback, when lookup will finish.
  26   PepperLookupRequest(net::HostResolver* resolver,
  27                       const net::HostResolver::RequestInfo& request_info,
  28                       net::RequestPriority priority,
  29                       T* bound_info,
  30                       const LookupRequestCallback& callback)
  31       : resolver_(resolver),
  32         request_info_(request_info),
  33         priority_(priority),
  34         bound_info_(bound_info),
  35         callback_(callback) {}
  36
  37   void Start() {
  38     int result =
  39         resolver_.Resolve(request_info_,
  40                           priority_,
  41                           &addresses_,
  42                           base::Bind(&PepperLookupRequest<T>::OnLookupFinished,
  43                                      base::Unretained(this)),
  44                           net::BoundNetLog());
  45     if (result != net::ERR_IO_PENDING)
  46       OnLookupFinished(result);
  47   }
  48
  49  private:
  50   void OnLookupFinished(int result) {
  51     // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
  52     tracked_objects::ScopedTracker tracking_profile(
  53         FROM_HERE_WITH_EXPLICIT_FUNCTION(
  54             "436634 PepperLookupRequest::OnLookupFinished"));
  55
  56     callback_.Run(result, addresses_, *bound_info_);
  57     delete this;
  58   }
  59
  60   net::SingleRequestHostResolver resolver_;
  61   net::HostResolver::RequestInfo request_info_;
  62   net::RequestPriority priority_;
  63   scoped_ptr<T> bound_info_;
  64   LookupRequestCallback callback_;
  65
  66   net::AddressList addresses_;
  67
  68   DISALLOW_COPY_AND_ASSIGN(PepperLookupRequest);
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_LOOKUP_REQUEST_H_