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Diffstat (limited to 'chromium/sync/js/README.js')
| -rw-r--r-- | chromium/sync/js/README.js | 48 |
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diff --git a/chromium/sync/js/README.js b/chromium/sync/js/README.js deleted file mode 100644 index 0fbfa66bc0e..00000000000 --- a/chromium/sync/js/README.js +++ /dev/null @@ -1,48 +0,0 @@ -Overview of chrome://sync-internals ------------------------------------ - -This note explains how chrome://sync-internals (also known as -about:sync) interacts with the sync service/backend. - -Basically, chrome://sync-internals sends messages to the sync backend -and the sync backend sends the reply asynchronously. The sync backend -also asynchronously raises events which chrome://sync-internals listen -to. - -A message and its reply has a name and a list of arguments, which is -basically a wrapper around an immutable ListValue. - -An event has a name and a details object, which is represented by a -JsEventDetails (js_event_details.h) object, which is basically a -wrapper around an immutable DictionaryValue. - -Message/event flow ------------------- - -chrome://sync-internals is represented by SyncInternalsUI -(chrome/browser/ui/webui/sync_internals_ui.h). SyncInternalsUI -interacts with the sync service via a JsController (js_controller.h) -object, which has a ProcessJsMessage() method that just delegates to -an underlying JsBackend instance (js_backend.h). The SyncInternalsUI -object also registers itself (as a JsEventHandler -[js_event_handler.h]) to the JsController object, and any events -raised by the JsBackend are propagated to the JsController and then to -the registered JsEventHandlers. - -The ProcessJsMessage() takes a WeakHandle (weak_handle.h) to a -JsReplyHandler (js_reply_handler.h), which the backend uses to send -replies safely across threads. SyncInternalsUI implements -JsReplyHandler, so it simply passes itself as the reply handler when -it calls ProcessJsMessage() on the JsController. - -The following objects live on the UI thread: - -- SyncInternalsUI (implements JsEventHandler, JsReplyHandler) -- SyncJsController (implements JsController, JsEventHandler) - -The following objects live on the sync thread: - -- SyncManager::SyncInternal (implements JsBackend) - -Of course, none of these objects need to know where the other objects -live, since they interact via WeakHandles. |