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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 #ifndef MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_ | |
6 #define MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_ | |
7 | |
8 #include "base/basictypes.h" | |
9 #include "base/callback_forward.h" | |
10 #include "base/memory/scoped_ptr.h" | |
11 #include "base/run_loop.h" | |
12 #include "third_party/mojo/src/mojo/public/cpp/system/core.h" | |
13 | |
14 namespace base { | |
15 class Thread; | |
16 } | |
17 | |
18 namespace mojo { | |
19 namespace common { | |
20 namespace test { | |
21 class HandleWatcherTest; | |
22 } | |
23 | |
24 // HandleWatcher is used to asynchronously wait on a handle and notify a Closure | |
25 // when the handle is ready, or the deadline has expired. | |
26 class HandleWatcher { | |
27 public: | |
28 HandleWatcher(); | |
29 | |
30 // The destructor implicitly stops listening. See Stop() for details. | |
31 ~HandleWatcher(); | |
32 | |
33 // Starts listening for |handle|. This implicitly invokes Stop(). In other | |
34 // words, Start() performs one asynchronous watch at a time. It is ok to call | |
35 // Start() multiple times, but it cancels any existing watches. |callback| is | |
36 // notified when the handle is ready, invalid or deadline has passed and is | |
37 // notified on the thread Start() was invoked on. If the current thread exits | |
38 // before the handle is ready, then |callback| is invoked with a result of | |
39 // MOJO_RESULT_ABORTED. | |
40 void Start(const Handle& handle, | |
41 MojoHandleSignals handle_signals, | |
42 MojoDeadline deadline, | |
43 const base::Callback<void(MojoResult)>& callback); | |
44 | |
45 // Stops listening. Does nothing if not in the process of listening. Blocks | |
46 // until no longer listening on the handle. | |
47 void Stop(); | |
48 | |
49 private: | |
50 class StateBase; | |
51 class SameThreadWatchingState; | |
52 class SecondaryThreadWatchingState; | |
53 | |
54 // If non-NULL Start() has been invoked. | |
55 scoped_ptr<StateBase> state_; | |
56 | |
57 DISALLOW_COPY_AND_ASSIGN(HandleWatcher); | |
58 }; | |
59 | |
60 } // namespace common | |
61 } // namespace mojo | |
62 | |
63 #endif // MOJO_MESSAGE_PUMP_HANDLE_WATCHER_H_ | |
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