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