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Diffstat (limited to 'chromium/docs/website/site/blink/activedomobject/index.md')
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diff --git a/chromium/docs/website/site/blink/activedomobject/index.md b/chromium/docs/website/site/blink/activedomobject/index.md deleted file mode 100644 index 0a3950ac445..00000000000 --- a/chromium/docs/website/site/blink/activedomobject/index.md +++ /dev/null @@ -1,48 +0,0 @@ ---- -breadcrumbs: -- - /blink - - Blink (Rendering Engine) -page_name: activedomobject -title: ActiveDOMObject ---- - -**DRAFT. NEEDS REVIEW** - -The ActiveDOMObject is used to implement DOM objects that can involve -asynchronous operations such as loading data from network (e.g. XMLHttpRequest, -WebSocket) to - -* keep them alive while async op is active -* hold back actions resulting from async op while the document is - suspended - -The ActiveDOMObject classes can override its hasPendingActivity() method to keep -the object alive while some async operation is in progress. As long as -hasPendingActivity() returns true, V8 prolongs its life so that it doesn't get -garbage collected even when it becomes unreachable. Note that there must be a V8 -wrapper for the object in order to this to work. - -While hasPendingActivity() returns true, the life of the parent Document object -is also prolonged (explanation TBA). You rarely need to override -contextDestroyed() for ActiveDOMObject subclasses. - -ActiveDOMObjects are notified of detach of the parent Document object (or -shutdown of the parent WorkerThread) as the stop() method called on it. -Commonly, they start shutdown of the asynchronous operation in stop() if any. -This detach occurs regardless of hasPendingActivity(). - -suspend() is called when dialogs such as alert(), prompt(), etc. are going to be -shown or the WebInspector's pause is going to be active. resume() is called when -the dialog is closed or the WebInspector resumes script execution. Between -suspend() and resume(), it's recommended that operations on the ActiveDOMObjects -are suspended. Since resource loading is automatically suspended by Chrome's -resource dispatched code, you may not need to manually hold back async method -calls. - -When implementing, it is critical that you also add ActiveDOMObject to the -interface flags in your IDL file, or GC will pay no attention to -hasPendingActivity()! - -As of Nov 12 2013 by tyoshino@. Updated July 17, 2014 by kouhei@ - -Thanks haraken@, abarth@
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