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1 // Copyright (c) 2011 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/sync/sync_js_controller.h" | |
6 | |
7 #include "base/location.h" | |
8 #include "chrome/browser/sync/js/js_backend.h" | |
9 #include "chrome/browser/sync/js/js_event_details.h" | |
10 | |
11 namespace browser_sync { | |
12 | |
13 SyncJsController::PendingJsMessage::PendingJsMessage( | |
14 const std::string& name, const JsArgList& args, | |
15 const WeakHandle<JsReplyHandler>& reply_handler) | |
16 : name(name), args(args), reply_handler(reply_handler) {} | |
17 | |
18 SyncJsController::PendingJsMessage::~PendingJsMessage() {} | |
19 | |
20 SyncJsController::SyncJsController() {} | |
21 | |
22 SyncJsController::~SyncJsController() { | |
23 AttachJsBackend(WeakHandle<JsBackend>()); | |
24 } | |
25 | |
26 void SyncJsController::AddJsEventHandler(JsEventHandler* event_handler) { | |
27 js_event_handlers_.AddObserver(event_handler); | |
28 UpdateBackendEventHandler(); | |
29 } | |
30 | |
31 void SyncJsController::RemoveJsEventHandler(JsEventHandler* event_handler) { | |
32 js_event_handlers_.RemoveObserver(event_handler); | |
33 UpdateBackendEventHandler(); | |
34 } | |
35 | |
36 void SyncJsController::AttachJsBackend( | |
37 const WeakHandle<JsBackend>& js_backend) { | |
38 js_backend_ = js_backend; | |
39 UpdateBackendEventHandler(); | |
40 | |
41 if (js_backend_.IsInitialized()) { | |
42 // Process any queued messages. | |
43 for (PendingJsMessageList::const_iterator it = | |
44 pending_js_messages_.begin(); | |
45 it != pending_js_messages_.end(); ++it) { | |
46 js_backend_.Call(FROM_HERE, &JsBackend::ProcessJsMessage, | |
47 it->name, it->args, it->reply_handler); | |
48 } | |
49 } | |
50 } | |
51 | |
52 void SyncJsController::ProcessJsMessage( | |
53 const std::string& name, const JsArgList& args, | |
54 const WeakHandle<JsReplyHandler>& reply_handler) { | |
55 if (js_backend_.IsInitialized()) { | |
56 js_backend_.Call(FROM_HERE, &JsBackend::ProcessJsMessage, | |
57 name, args, reply_handler); | |
58 } else { | |
59 pending_js_messages_.push_back( | |
60 PendingJsMessage(name, args, reply_handler)); | |
61 } | |
62 } | |
63 | |
64 void SyncJsController::HandleJsEvent(const std::string& name, | |
65 const JsEventDetails& details) { | |
66 FOR_EACH_OBSERVER(JsEventHandler, js_event_handlers_, | |
67 HandleJsEvent(name, details)); | |
68 } | |
69 | |
70 void SyncJsController::UpdateBackendEventHandler() { | |
71 if (js_backend_.IsInitialized()) { | |
72 // To avoid making the backend send useless events, we clear the | |
73 // event handler we pass to it if we don't have any event | |
74 // handlers. | |
75 WeakHandle<JsEventHandler> backend_event_handler = | |
76 (js_event_handlers_.size() > 0) ? | |
77 MakeWeakHandle(AsWeakPtr()) : WeakHandle<SyncJsController>(); | |
78 js_backend_.Call(FROM_HERE, &JsBackend::SetJsEventHandler, | |
79 backend_event_handler); | |
80 } | |
81 } | |
82 | |
83 } // namespace browser_sync | |
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