BAEL-3596 - Asynchronous Method Calls in Java

2020-01-01 16:00:57 +02:00
parent 0104b269fa
commit 9cd73de5cc
5 changed files with 323 additions and 84 deletions
@@ -0,0 +1,57 @@
+package com.baeldung.async;
+
+import static com.ea.async.Async.await;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+
+import com.ea.async.Async;
+
+public class EAAsyncExample {
+
+    static {
+        Async.init();
+    }
+
+    public static void main(String[] args) throws Exception {
+        usingCompletableFuture();
+        usingAsyncAwait();
+    }
+
+    public static void usingCompletableFuture() throws InterruptedException, ExecutionException, Exception {
+        CompletableFuture<Void> completableFuture = hello()
+            .thenComposeAsync(hello -> mergeWorld(hello))
+            .thenAcceptAsync(helloWorld -> print(helloWorld))
+            .exceptionally( throwable -> {
+                System.out.println(throwable.getCause()); 
+                return null;
+            });
+        completableFuture.get();
+    }
+
+    public static CompletableFuture<String> hello() {
+        CompletableFuture<String> completableFuture = CompletableFuture.supplyAsync(() -> "Hello");
+        return completableFuture;
+    }
+
+    public static CompletableFuture<String> mergeWorld(String s) {
+        CompletableFuture<String> completableFuture = CompletableFuture.supplyAsync(() -> {
+            return s + " World!";
+        });
+        return completableFuture;
+    }
+
+    public static void print(String str) {
+        CompletableFuture.runAsync(() -> System.out.println(str));
+    }
+
+    private static void usingAsyncAwait() {
+        try {
+            String hello = await(hello());
+            String helloWorld = await(mergeWorld(hello));
+            await(CompletableFuture.runAsync(() -> print(helloWorld)));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+}