Merge branch 'master' of https://github.com/JonCook/tutorials

dubbo/src/test/java/com/baeldung/dubbo/ClusterDynamicLoadBalanceLiveTest.java

@@ -0,0 +1,70 @@
+package com.baeldung.dubbo;
+
+import com.baeldung.dubbo.remote.GreetingsService;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.context.support.ClassPathXmlApplicationContext;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.OptionalDouble;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+import static java.util.concurrent.TimeUnit.SECONDS;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author aiet
+ */
+public class ClusterDynamicLoadBalanceLiveTest {
+
+    private ExecutorService executorService;
+
+    @Before
+    public void initRemote() {
+        executorService = Executors.newFixedThreadPool(2);
+        executorService.submit(() -> {
+            ClassPathXmlApplicationContext remoteContext = new ClassPathXmlApplicationContext("cluster/provider-app-default.xml");
+            remoteContext.start();
+        });
+        executorService.submit(() -> {
+            SECONDS.sleep(2);
+            ClassPathXmlApplicationContext backupRemoteContext = new ClassPathXmlApplicationContext("cluster/provider-app-special.xml");
+            backupRemoteContext.start();
+            return null;
+        });
+    }
+
+    @Test
+    public void givenProviderCluster_whenConsumerSaysHi_thenResponseBalanced() throws InterruptedException {
+        ClassPathXmlApplicationContext localContext = new ClassPathXmlApplicationContext("cluster/consumer-app-lb.xml");
+        localContext.start();
+        GreetingsService greetingsService = (GreetingsService) localContext.getBean("greetingsService");
+        List<Long> elapseList = new ArrayList<>(6);
+        for (int i = 0; i < 6; i++) {
+            long current = System.currentTimeMillis();
+            String hiMessage = greetingsService.sayHi("baeldung");
+            assertNotNull(hiMessage);
+            elapseList.add(System.currentTimeMillis() - current);
+            SECONDS.sleep(1);
+        }
+
+        OptionalDouble avgElapse = elapseList
+          .stream()
+          .mapToLong(e -> e)
+          .average();
+        assertTrue(avgElapse.isPresent());
+        assertTrue(avgElapse.getAsDouble() > 1666.0);
+
+    }
+
+    @After
+    public void destroy() {
+        executorService.shutdown();
+    }
+
+}