feat: safe orTimeout* methods keep the direct TimeoutException in…

…stead of wrapper `CompletionException` ⏳ ✨

consistent with `Cf.orTimeout` builtin method ✨

cffu-core/src/main/java/io/foldright/cffu/Cffu.java

@@ -946,11 +946,6 @@ public Cffu<T> exceptionallyAsync(Function<Throwable, ? extends T> fn, Executor
      * if not otherwise completed before the given timeout.
      * <p>
      * Uses {@link #defaultExecutor()} as {@code executorWhenTimeout}.
-     * <p>
-     * <strong>CAUTION:<br></strong>
-     * If the wait timed out, the returned Cffu complete exceptionally with a CompletionException holding
-     * the {@link TimeoutException} as its cause; NOT a direct {@link TimeoutException}
-     * like {@link #unsafeOrTimeout(long, TimeUnit)}/{@link CompletableFuture#orTimeout(long, TimeUnit)}.
      *
      * @param timeout how long to wait before completing exceptionally with a TimeoutException, in units of {@code unit}
      * @param unit    a {@code TimeUnit} determining how to interpret the {@code timeout} parameter
@@ -964,11 +959,6 @@ public Cffu<T> orTimeout(long timeout, TimeUnit unit) {
     /**
      * Exceptionally completes this Cffu with a {@link TimeoutException}
      * if not otherwise completed before the given timeout.
-     * <p>
-     * <strong>CAUTION:<br></strong>
-     * If the wait timed out, the returned Cffu complete exceptionally with a CompletionException holding
-     * the {@link TimeoutException} as its cause; NOT a direct {@link TimeoutException}
-     * like {@link #unsafeOrTimeout(long, TimeUnit)}/{@link CompletableFuture#orTimeout(long, TimeUnit)}.
      *
      * @param executorWhenTimeout the async executor when triggered by timeout
      * @param timeout             how long to wait before completing exceptionally with a TimeoutException, in units of {@code unit}

cffu-core/src/main/java/io/foldright/cffu/CompletableFutureUtils.java

@@ -1487,11 +1487,6 @@ C exceptionallyAsync(C cf, Function<Throwable, ? extends T> fn, Executor executo
      * if not otherwise completed before the given timeout.
      * <p>
      * Uses CompletableFuture's default asynchronous execution facility as {@code executorWhenTimeout}.
-     * <p>
-     * <strong>CAUTION:<br></strong>
-     * If the wait timed out, the returned CompletableFuture complete exceptionally with a CompletionException holding
-     * the {@link TimeoutException} as its cause; NOT a direct {@link TimeoutException}
-     * like {@link #orTimeout(CompletableFuture, long, TimeUnit)}/{@link CompletableFuture#orTimeout(long, TimeUnit)}.
      *
      * @param timeout how long to wait before completing exceptionally with a TimeoutException, in units of {@code unit}
      * @param unit    a {@code TimeUnit} determining how to interpret the {@code timeout} parameter
@@ -1505,11 +1500,6 @@ public static <C extends CompletableFuture<?>> C cffuOrTimeout(C cf, long timeou
     /**
      * Exceptionally completes given CompletableFuture with a {@link TimeoutException}
      * if not otherwise completed before the given timeout.
-     * <p>
-     * <strong>CAUTION:<br></strong>
-     * If the wait timed out, the returned CompletableFuture complete exceptionally with a CompletionException holding
-     * the {@link TimeoutException} as its cause; NOT a direct {@link TimeoutException}
-     * like {@link #orTimeout(CompletableFuture, long, TimeUnit)}/{@link CompletableFuture#orTimeout(long, TimeUnit)}.
      *
      * @param executorWhenTimeout the async executor when triggered by timeout
      * @param timeout             how long to wait before completing exceptionally with a TimeoutException, in units of {@code unit}
@@ -1646,17 +1636,20 @@ C completeOnTimeout(C cf, @Nullable T value, long timeout, TimeUnit unit) {
 
     @SuppressWarnings("unchecked")
     private static <C extends CompletableFuture<?>> C hopExecutorIfAtCfDelayerThread(C cf, Executor asyncExecutor) {
-        final CompletionStage<Object> f = (CompletionStage<Object>) cf;
+        CompletableFuture<Object> ret = newIncompleteFuture(cf);
 
-        return (C) f.handle((v, ex) -> null).thenCompose(unused -> {
-            if (!atCfDelayerThread()) return f;
+        cf.whenComplete((v, ex) -> {
+            if (!atCfDelayerThread()) completeCf(ret, v, ex);
+            else delayedExecutor(0, TimeUnit.SECONDS, asyncExecutor)
+                    .execute(() -> completeCf(ret, v, ex));
+        });
 
-            CompletableFuture<Void> signal = new CompletableFuture<>();
-            delayedExecutor(0, TimeUnit.SECONDS, asyncExecutor)
-                    .execute(() -> signal.complete(null));
+        return (C) ret;
+    }
 
-            return signal.thenCompose(v -> f);
-        });
+    private static void completeCf(CompletableFuture<Object> cf, Object value, @Nullable Throwable ex) {
+        if (ex == null) cf.complete(value);
+        else cf.completeExceptionally(ex);
     }
 
     //# Advanced methods of CompletionStage

cffu-core/src/test/java/io/foldright/cffu/CompletableFutureUtilsTest.java

@@ -1043,17 +1043,13 @@ void test_safeBehavior_orTimeout() {
         }).join());
 
         assertEquals(n, cffuOrTimeout(createIncompleteFuture(), 5, TimeUnit.MILLISECONDS).handle((r, ex) -> {
-            // FIXME: Not TimeoutException, not compatible with orTimeout method
-            assertInstanceOf(CompletionException.class, ex);
-            assertInstanceOf(TimeoutException.class, ex.getCause());
+            assertInstanceOf(TimeoutException.class, ex);
             assertFalse(Delayer.atCfDelayerThread());
             assertNotSame(testThread, currentThread());
             return n;
         }).join());
         assertEquals(n, cffuOrTimeout(createIncompleteFuture(), executorService, 5, TimeUnit.MILLISECONDS).handle((r, ex) -> {
-            // FIXME: Not TimeoutException, not compatible with orTimeout method
-            assertInstanceOf(CompletionException.class, ex);
-            assertInstanceOf(TimeoutException.class, ex.getCause());
+            assertInstanceOf(TimeoutException.class, ex);
             assertFalse(Delayer.atCfDelayerThread());
             assertTrue(TestThreadPoolManager.isRunInExecutor(executorService));
             return n;

cffu-kotlin/src/main/java/io/foldright/cffu/kotlin/CompletableFutureExtensions.kt

@@ -771,9 +771,6 @@ fun <T, C : CompletionStage<in T>> C.exceptionallyAsync(fn: Function<Throwable,
  *
  * Uses CompletableFuture's default asynchronous execution facility as `executorWhenTimeout`.
  *
- * **CAUTION:** If the wait timed out, the returned CompletableFuture complete exceptionally with a CompletionException
- * holding the [TimeoutException] as its cause; NOT a direct [TimeoutException] like [orTimeout]/[CompletableFuture.orTimeout].
- *
  * @param timeout how long to wait before completing exceptionally with a TimeoutException, in units of `unit`
  * @param unit    a `TimeUnit` determining how to interpret the `timeout` parameter
  * @return the new CompletableFuture
@@ -785,9 +782,6 @@ fun <T, C : CompletableFuture<out T>> C.cffuOrTimeout(timeout: Long, unit: TimeU
  * Exceptionally completes this CompletableFuture with a TimeoutException
  * if not otherwise completed before the given timeout.
  *
- * **CAUTION:** If the wait timed out, the returned CompletableFuture complete exceptionally with a CompletionException
- * holding the [TimeoutException] as its cause; NOT a direct [TimeoutException] like [orTimeout]/[CompletableFuture.orTimeout].
- *
  * @param executorWhenTimeout the async executor when triggered by timeout
  * @param timeout how long to wait before completing exceptionally with a TimeoutException, in units of `unit`
  * @param unit    a `TimeUnit` determining how to interpret the `timeout` parameter