--- jsr166/src/test/tck/CompletableFutureTest.java	2015/11/15 23:31:51	1.138
+++ jsr166/src/test/tck/CompletableFutureTest.java	2016/06/04 23:49:29	1.147
@@ -1040,8 +1040,10 @@ public class CompletableFutureTest exten
 
         checkCompletedWithWrappedException(g, ex1);
         checkCompletedExceptionally(f, ex1);
-        assertEquals(1, ex1.getSuppressed().length);
-        assertSame(ex2, ex1.getSuppressed()[0]);
+        if (testImplementationDetails) {
+            assertEquals(1, ex1.getSuppressed().length);
+            assertSame(ex2, ex1.getSuppressed()[0]);
+        }
         assertEquals(1, a.get());
     }}
 
@@ -3293,7 +3295,7 @@ public class CompletableFutureTest exten
             () -> f.obtrudeException(null),
 
             () -> CompletableFuture.delayedExecutor(1L, SECONDS, null),
-            () -> CompletableFuture.delayedExecutor(1L, null, new ThreadExecutor()),
+            () -> CompletableFuture.delayedExecutor(1L, null, exec),
             () -> CompletableFuture.delayedExecutor(1L, null),
 
             () -> f.orTimeout(1L, null),
@@ -3523,7 +3525,7 @@ public class CompletableFutureTest exten
         long timeoutMillis = timeoutMillis();
         CompletableFuture<Integer> f = new CompletableFuture<>();
         long startTime = System.nanoTime();
-        f.orTimeout(timeoutMillis, MILLISECONDS);
+        assertSame(f, f.orTimeout(timeoutMillis, MILLISECONDS));
         checkCompletedWithTimeoutException(f);
         assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
     }
@@ -3538,8 +3540,8 @@ public class CompletableFutureTest exten
         CompletableFuture<Integer> g = new CompletableFuture<>();
         long startTime = System.nanoTime();
         f.complete(v1);
-        f.orTimeout(LONG_DELAY_MS, MILLISECONDS);
-        g.orTimeout(LONG_DELAY_MS, MILLISECONDS);
+        assertSame(f, f.orTimeout(LONG_DELAY_MS, MILLISECONDS));
+        assertSame(g, g.orTimeout(LONG_DELAY_MS, MILLISECONDS));
         g.complete(v1);
         checkCompletedNormally(f, v1);
         checkCompletedNormally(g, v1);
@@ -3554,11 +3556,14 @@ public class CompletableFutureTest exten
                        () -> testCompleteOnTimeout_timesOut(null));
     }
 
+    /**
+     * completeOnTimeout completes with given value if not complete
+     */
     public void testCompleteOnTimeout_timesOut(Integer v) {
         long timeoutMillis = timeoutMillis();
         CompletableFuture<Integer> f = new CompletableFuture<>();
         long startTime = System.nanoTime();
-        f.completeOnTimeout(v, timeoutMillis, MILLISECONDS);
+        assertSame(f, f.completeOnTimeout(v, timeoutMillis, MILLISECONDS));
         assertSame(v, f.join());
         assertTrue(millisElapsedSince(startTime) >= timeoutMillis);
         f.complete(99);         // should have no effect
@@ -3575,8 +3580,8 @@ public class CompletableFutureTest exten
         CompletableFuture<Integer> g = new CompletableFuture<>();
         long startTime = System.nanoTime();
         f.complete(v1);
-        f.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
-        g.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS);
+        assertSame(f, f.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS));
+        assertSame(g, g.completeOnTimeout(-1, LONG_DELAY_MS, MILLISECONDS));
         g.complete(v1);
         checkCompletedNormally(f, v1);
         checkCompletedNormally(g, v1);
@@ -3627,12 +3632,25 @@ public class CompletableFutureTest exten
     //--- tests of implementation details; not part of official tck ---
 
     Object resultOf(CompletableFuture<?> f) {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            try {
+                System.setSecurityManager(null);
+            } catch (SecurityException giveUp) {
+                return "Reflection not available";
+            }
+        }
+
         try {
             java.lang.reflect.Field resultField
                 = CompletableFuture.class.getDeclaredField("result");
             resultField.setAccessible(true);
             return resultField.get(f);
-        } catch (Throwable t) { throw new AssertionError(t); }
+        } catch (Throwable t) {
+            throw new AssertionError(t);
+        } finally {
+            if (sm != null) System.setSecurityManager(sm);
+        }
     }
 
     public void testExceptionPropagationReusesResultObject() {
@@ -3923,6 +3941,38 @@ public class CompletableFutureTest exten
                                  Monad.plus(godot, Monad.unit(5L)));
     }
 
+    /**
+     * A single CompletableFuture with many dependents.
+     * A demo of scalability - runtime is O(n).
+     */
+    public void testManyDependents() throws Throwable {
+        final int n = 1_000;
+        final CompletableFuture<Void> head = new CompletableFuture<>();
+        final CompletableFuture<Void> complete = CompletableFuture.completedFuture((Void)null);
+        final AtomicInteger count = new AtomicInteger(0);
+        for (int i = 0; i < n; i++) {
+            head.thenRun(() -> count.getAndIncrement());
+            head.thenAccept((x) -> count.getAndIncrement());
+            head.thenApply((x) -> count.getAndIncrement());
+
+            head.runAfterBoth(complete, () -> count.getAndIncrement());
+            head.thenAcceptBoth(complete, (x, y) -> count.getAndIncrement());
+            head.thenCombine(complete, (x, y) -> count.getAndIncrement());
+            complete.runAfterBoth(head, () -> count.getAndIncrement());
+            complete.thenAcceptBoth(head, (x, y) -> count.getAndIncrement());
+            complete.thenCombine(head, (x, y) -> count.getAndIncrement());
+
+            head.runAfterEither(new CompletableFuture<Void>(), () -> count.getAndIncrement());
+            head.acceptEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
+            head.applyToEither(new CompletableFuture<Void>(), (x) -> count.getAndIncrement());
+            new CompletableFuture<Void>().runAfterEither(head, () -> count.getAndIncrement());
+            new CompletableFuture<Void>().acceptEither(head, (x) -> count.getAndIncrement());
+            new CompletableFuture<Void>().applyToEither(head, (x) -> count.getAndIncrement());
+        }
+        head.complete(null);
+        assertEquals(5 * 3 * n, count.get());
+    }
+
 //     static <U> U join(CompletionStage<U> stage) {
 //         CompletableFuture<U> f = new CompletableFuture<>();
 //         stage.whenComplete((v, ex) -> {