issue35 Add CompletionStage as supported return type for participant …

…methods

Signed-off-by: xstefank <[email protected]>

spec/src/main/asciidoc/microprofile-lra-spec.adoc

@@ -635,6 +635,8 @@ MUST adhere to these predefined signatures:
 ** <<source-ParticipantStatus,ParticipantStatus>>
 ** `javax.ws.rs.core.Response`: handled similarly as for 
 <<jaxrs-participant-methods, JAX-RS participant methods>>
+** `java.util.concurrent.CompletionStage`: with the parameter of any of the previously 
+defined types
 * *Arguments*: up to 2 arguments of types in this order:
 ** `java.net.URI`: representing current LRA context identification
 ** `java.net.URI`: representing potentional parent LRA context identification
@@ -652,10 +654,10 @@ Examples of valid signatures:
 public void compensate(URI lraId, URI parentId)
 
 @Complete
-public Response complete()
+public Response complete(URI lraId)
 
 @Status
-public ParticipantStatus status(URI lraId)
+public CompletionStage<ParticipantStatus> status(URI lraId)
 ----
 
 Examples of invalid signatures:

tck/src/main/java/org/eclipse/microprofile/lra/tck/participant/nonjaxrs/ValidLRAParticipant.java

@@ -38,6 +38,8 @@
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 import java.net.URI;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.logging.Logger;
 
@@ -93,13 +95,15 @@ public void completeWithException(URI lraId, URI parentId) {
     }
 
     @Compensate
-    public ParticipantStatus compensate(URI lraId) {
-        verifyLRAId(lraId);
+    public CompletionStage<ParticipantStatus> compensate(URI lraId) {
+        return CompletableFuture.supplyAsync(() -> {
+            verifyLRAId(lraId);
 
-        compensatedCount.incrementAndGet();
+            compensatedCount.incrementAndGet();
 
-        LOGGER.info(String.format("LRA id '%s' was compensated", lraId));
-        return ParticipantStatus.Compensating;
+            LOGGER.info(String.format("LRA id '%s' was compensated", lraId));
+            return ParticipantStatus.Compensating;
+        });
     }
 
     @Status