Add LongAccumulator example

winterbe · winterbe · commit eac9257fa6c9 · 2015-04-11T21:52:43.000+02:00
diff --git a/src/com/winterbe/java8/samples/concurrent/LongAccumulator1.java b/src/com/winterbe/java8/samples/concurrent/LongAccumulator1.java
@@ -0,0 +1,31 @@
+package com.winterbe.java8.samples.concurrent;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.LongAccumulator;
+import java.util.stream.IntStream;
+
+/**
+ * @author Benjamin Winterberg
+ */
+public class LongAccumulator1 {
+
+    private static final int SIZE = 10;
+
+    private static LongAccumulator accumulator = new LongAccumulator((x, y) -> 2 * x + y, 1L);
+
+    public static void main(String[] args) {
+        testAccumulate();
+    }
+
+    private static void testAccumulate() {
+        ExecutorService executor = Executors.newFixedThreadPool(2);
+
+        IntStream.range(0, SIZE)
+                .forEach(i -> executor.submit(() -> accumulator.accumulate(i)));
+
+        ConcurrentUtils.stop(executor);
+
+        System.out.format("Add: %d\n", accumulator.getThenReset());
+    }
+}
