proxy_resolver_v8_tracing.h revision 2a99a7e74a7f215066514fe81d2bfa6639d9eddd 
1// Copyright (c) 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#ifndef NET_PROXY_PROXY_RESOLVER_V8_TRACING_H_
6#define NET_PROXY_PROXY_RESOLVER_V8_TRACING_H_
7
8#include "base/basictypes.h"
9#include "base/memory/ref_counted.h"
10#include "base/memory/scoped_ptr.h"
11#include "base/threading/non_thread_safe.h"
12#include "net/base/net_export.h"
13#include "net/proxy/proxy_resolver.h"
14
15namespace base {
16class Thread;
17class MessageLoopProxy;
18}  // namespace base
19
20namespace net {
21
22class HostResolver;
23class NetLog;
24class ProxyResolverErrorObserver;
25class ProxyResolverV8;
26
27// ProxyResolverV8Tracing is a non-blocking ProxyResolver. It executes
28// ProxyResolverV8 on a single helper thread, and does some magic to avoid
29// blocking in DNS. For more details see the design document:
30// https://docs.google.com/a/google.com/document/d/16Ij5OcVnR3s0MH4Z5XkhI9VTPoMJdaBn9rKreAmGOdE/edit?pli=1
31class NET_EXPORT_PRIVATE ProxyResolverV8Tracing
32    : public ProxyResolver,
33      NON_EXPORTED_BASE(public base::NonThreadSafe) {
34 public:
35  // Constructs a ProxyResolver that will issue DNS requests through
36  // |host_resolver|, forward Javascript errors through |error_observer|, and
37  // log Javascript errors and alerts to |net_log|.
38  //
39  // Note that the constructor takes ownership of |error_observer|, whereas
40  // |host_resolver| and |net_log| are expected to outlive |this|.
41  ProxyResolverV8Tracing(HostResolver* host_resolver,
42                         ProxyResolverErrorObserver* error_observer,
43                         NetLog* net_log);
44
45  virtual ~ProxyResolverV8Tracing();
46
47  // ProxyResolver implementation:
48  virtual int GetProxyForURL(const GURL& url,
49                             ProxyInfo* results,
50                             const CompletionCallback& callback,
51                             RequestHandle* request,
52                             const BoundNetLog& net_log) OVERRIDE;
53  virtual void CancelRequest(RequestHandle request) OVERRIDE;
54  virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE;
55  virtual void CancelSetPacScript() OVERRIDE;
56  virtual void PurgeMemory() OVERRIDE;
57  virtual int SetPacScript(
58      const scoped_refptr<ProxyResolverScriptData>& script_data,
59      const CompletionCallback& callback) OVERRIDE;
60
61 private:
62  class Job;
63
64  // The worker thread on which the ProxyResolverV8 will be run.
65  scoped_ptr<base::Thread> thread_;
66  scoped_ptr<ProxyResolverV8> v8_resolver_;
67
68  // Non-owned host resolver, which is to be operated on the origin thread.
69  HostResolver* host_resolver_;
70
71  scoped_ptr<ProxyResolverErrorObserver> error_observer_;
72  NetLog* net_log_;
73
74  // The outstanding SetPacScript operation, or NULL.
75  scoped_refptr<Job> set_pac_script_job_;
76
77  // The number of outstanding (non-cancelled) jobs.
78  int num_outstanding_callbacks_;
79
80  DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8Tracing);
81};
82
83}  // namespace net
84
85#endif  // NET_PROXY_PROXY_RESOLVER_V8_TRACING_H_
86