yangzhang75 commented on code in PR #8516:
URL: https://github.com/apache/texera/pull/8516#discussion_r3994482653
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frontend/src/app/workspace/component/workflow-form/workflow-form.component.ts:
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@@ -510,11 +551,43 @@ export class WorkflowFormComponent implements OnInit,
OnDestroy {
}
/**
- * Show the workflow rather than edit it: the graph shape and its properties
are read-only
- * on this page. A later PR's authoring mode makes properties editable with
write access.
+ * Whether this page may hold the graph unlocked: a writer in edit mode, and
no run in flight. The
+ * run rule is the canvas's own (a run locks the graph until it ends), kept
here too so that entering
+ * edit mode mid-run cannot undo it. Every other state is locked, so a
reader, or a writer merely
+ * viewing, cannot change the workflow through this page.
*/
+ private mayUnlock(): boolean {
+ return this.authoring && this.canEdit && !this.isRunning;
+ }
+
+ /** Lock or unlock editing from the current state (see mayUnlock); the one
reducer for both directions. */
private applyEditability(): void {
- this.workflowActionService.disableWorkflowModification();
+ if (this.mayUnlock()) {
+ this.workflowActionService.enableWorkflowModification();
+ } else {
+ this.workflowActionService.disableWorkflowModification();
+ }
+ }
+
+ /**
+ * The lock is a root-level flag with writers that know nothing of this
page: the execute service
+ * unlocks it whenever a run ends (completed, failed, killed, reset), the
computing-unit selector
+ * unlocks it when it finds no run on the chosen unit, and any future caller
may too. Rather than
+ * chase each one, clamp at the one place they all report to: whenever the
flag turns on while this
+ * page must stay locked, turn it off again. In edit mode the canvas rule
then stands unchanged:
+ * locked while a run is in flight, unlocked once it ends -- the execute
service flips the lock
+ * before it emits the new state, so that unlock is clamped here (this page
still sees "running")
+ * and given back by the execution-state handler, which re-applies the rule
with the new state.
+ */
+ private clampEditability(): void {
+ this.workflowActionService
+ .getWorkflowModificationEnabledStream()
+ .pipe(untilDestroyed(this))
+ .subscribe(enabled => {
+ if (enabled && !this.mayUnlock()) {
+ this.workflowActionService.disableWorkflowModification();
Review Comment:
Right, the nested disable left undo/redo enabled and later subscribers on
the stale true. 52339ac34 defers the clamp by one microtask
(observeOn(asapScheduler)), so it runs after enableWorkflowModification() has
finished and the stream has reached every subscriber; the disable is then the
last word and the flag, undo/redo and all consumers agree. In edit mode the
execution-state handler has re-applied the rule by then, so the unlock after a
run stands. Specs assert the clamp is not synchronous and cover both orders;
deleting the deferral turns two of them red.
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