Import atomix/{storage,utils}

[controller.git] / third-party / atomix / utils / src / test / java / io / atomix / utils / concurrent / OrderedFutureTest.java

diff --git a/third-party/atomix/utils/src/test/java/io/atomix/utils/concurrent/OrderedFutureTest.java b/third-party/atomix/utils/src/test/java/io/atomix/utils/concurrent/OrderedFutureTest.java
new file mode 100644 (file)
index 0000000..dfada0c
--- /dev/null
+++ b/third-party/atomix/utils/src/test/java/io/atomix/utils/concurrent/OrderedFutureTest.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.atomix.utils.concurrent;
+
+import org.junit.Test;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+/**
+ * Ordered completable future test.
+ */
+public class OrderedFutureTest {
+
+  /**
+   * Tests ordered completion of future callbacks.
+   */
+  @Test
+  public void testOrderedCompletion() throws Throwable {
+    CompletableFuture<String> future = new OrderedFuture<>();
+    AtomicInteger order = new AtomicInteger();
+    future.whenComplete((r, e) -> assertEquals(1, order.incrementAndGet()));
+    future.whenComplete((r, e) -> assertEquals(2, order.incrementAndGet()));
+    future.handle((r, e) -> {
+      assertEquals(3, order.incrementAndGet());
+      assertEquals("foo", r);
+      return "bar";
+    });
+    future.thenRun(() -> assertEquals(3, order.incrementAndGet()));
+    future.thenAccept(r -> {
+      assertEquals(5, order.incrementAndGet());
+      assertEquals("foo", r);
+    });
+    future.thenApply(r -> {
+      assertEquals(6, order.incrementAndGet());
+      assertEquals("foo", r);
+      return "bar";
+    });
+    future.whenComplete((r, e) -> {
+      assertEquals(7, order.incrementAndGet());
+      assertEquals("foo", r);
+    });
+    future.complete("foo");
+  }
+
+  /**
+   * Tests ordered failure of future callbacks.
+   */
+  public void testOrderedFailure() throws Throwable {
+    CompletableFuture<String> future = new OrderedFuture<>();
+    AtomicInteger order = new AtomicInteger();
+    future.whenComplete((r, e) -> assertEquals(1, order.incrementAndGet()));
+    future.whenComplete((r, e) -> assertEquals(2, order.incrementAndGet()));
+    future.handle((r, e) -> {
+      assertEquals(3, order.incrementAndGet());
+      return "bar";
+    });
+    future.thenRun(() -> fail());
+    future.thenAccept(r -> fail());
+    future.exceptionally(e -> {
+      assertEquals(3, order.incrementAndGet());
+      return "bar";
+    });
+    future.completeExceptionally(new RuntimeException("foo"));
+  }
+
+  /**
+   * Tests calling callbacks that are added after completion.
+   */
+  public void testAfterComplete() throws Throwable {
+    CompletableFuture<String> future = new OrderedFuture<>();
+    future.whenComplete((result, error) -> assertEquals("foo", result));
+    future.complete("foo");
+    AtomicInteger count = new AtomicInteger();
+    future.whenComplete((result, error) -> {
+      assertEquals("foo", result);
+      assertEquals(1, count.incrementAndGet());
+    });
+    future.thenAccept(result -> {
+      assertEquals("foo", result);
+      assertEquals(2, count.incrementAndGet());
+    });
+    assertEquals(2, count.get());
+  }
+}