Fix cancel support with CompletableFuture compose

[angelozerr]

Fix cancel support with CompletableFuture compose

Signed-off-by: azerr azerr@redhat.com

[angelozerr]

I noticed that all feature (completion, codeAction, hover, etc) which uses

quarkus-ls/qute.ls/com.redhat.qute.ls/src/main/java/com/redhat/qute/ls/template/TemplateFileTextDocumentService.java

Line 383 in 8a52980

public <R> CompletableFuture<R> getTemplateCompose(TextDocumentIdentifier documentIdentifier,

are not canceled when client cancel the request. I mean when

cancelChecker.checkCanceled()

is called,it doesn't throw a CancellationException.

I noticed that with code action which can take some time sometimes, so it is hard to reproduce easily. But you can reproduce easily if you:

• set a breakpoint at

  quarkus-ls/qute.ls/com.redhat.qute.ls/src/main/java/com/redhat/qute/services/QuteHover.java

  Line 77 in 8a52980

  cancelChecker.checkCanceled();

• you hover (on, vscode side) a Qute template twice (it will create 2 requests, the first must be canceled)
• you will notice that the first call of cancelChecker.checkCanceled() will throw a CancellationException (like expected) and the second call will returnthe Hover.

Without my PR, you will notice that the first call of cancelChecker.checkCanceled() will not throw a CancellationException.

[datho7561]

Works for me. Good catch! We should probably also copy this over to other language servers.