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Bug 334908

Summary:

QVTo Editor: content assist completion is expensive; provide an option to turn it off and to delay its activation.

Product:

[Modeling] QVTo

Reporter:

Nicolas Rouquette <nicolas.f.rouquette>

Component:

Assignee:

Sergey Boyko <serg.boyko2011>

Status:

ASSIGNED ---

QA Contact:

Severity:

normal

Priority:

CC:

serg.boyko2011

Version:

unspecified

Flags:

serg.boyko2011: indigo+

Target Milestone:

3.1

Hardware:

All

OS:

All

Whiteboard:

Usability

Attachments:

Description	Flags
Temporary workaround for disabling greedy QvtCompletion processing.	none

Description Nicolas Rouquette

2011-01-20 10:48:47 EST

Currently, any character in org.eclipse.m2m.internal.qvt.oml.editor.ui.completion.QvtCompletionProcessor.ACTIVATION triggers content assist in the QVTO editor.

This computing possible completions becomes very expensive when we have a large metamodel (e.g., UML) or when we have lots of QVTO code that augments the metamodel with helpers/queries/mapping operations/black-box operations to the point of being a significant productivity bottleneck.

I suggest adding QVTO preferences to allow turning off completion and/or delay it like the JDT editor does -- see org.eclipse.jdt.internal.ui.text.ContentAssistPreference

Comment 1 Nicolas Rouquette

2011-01-21 11:49:06 EST

Created attachment 187301 [details]
Temporary workaround for disabling greedy QvtCompletion processing.

It would be nice to have QVTo preferences to enable/disable QVT Completion processing.

The problem is that each QvtCompletion is expensive because it invokes a new lightweight parse of the Qvt document.
There is currently very little that is cached across such computations so the overall performance is very slow.
Until an efficient caching mechanism is available to speed up QvtCompletion processing, we need to have the option to turn this feature off.

Note that this workaround does not disable on-demand completion (e.g., control + space).