From 3c3e69986085f40ade175a5472da881d009cf073 Mon Sep 17 00:00:00 2001
From: Oleg Zhurakousky <ozhurakousky@vmware.com>
Date: Sun, 20 Jun 2010 13:08:08 +0000
Subject: [PATCH] INT-1188, Added test cases showing performance benchmarks
 (sync and async)

---
 .../core/TimeBasedUUIDGeneratorTests.java     | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/spring-integration-core/src/test/java/org/springframework/integration/core/TimeBasedUUIDGeneratorTests.java b/spring-integration-core/src/test/java/org/springframework/integration/core/TimeBasedUUIDGeneratorTests.java
index 4eb445c77e..8ad19dff03 100644
--- a/spring-integration-core/src/test/java/org/springframework/integration/core/TimeBasedUUIDGeneratorTests.java
+++ b/spring-integration-core/src/test/java/org/springframework/integration/core/TimeBasedUUIDGeneratorTests.java
@@ -16,9 +16,13 @@
 package org.springframework.integration.core;
 
 import java.util.UUID;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 
 import org.junit.Assert;
 import org.junit.Test;
+import org.springframework.util.StopWatch;
 
 /**
  * @author Oleg Zhurakousky
@@ -47,4 +51,54 @@ public class TimeBasedUUIDGeneratorTests {
 			id = newId;
 		}
 	}
+	@Test
+	public void performanceTestSynch(){
+		StopWatch stopWatch = new StopWatch();
+		stopWatch.start();
+		for (int i = 0; i < 10000; i++) {
+			TimeBasedUUIDGenerator.generateId();
+		}
+		stopWatch.stop();
+		System.out.println("Generated 10000 UUID (sync) via TimeBasedUUIDGenerator.generateId(): in " + stopWatch.getTotalTimeSeconds() + " seconds");
+		
+		stopWatch = new StopWatch();
+		stopWatch.start();
+		for (int i = 0; i < 10000; i++) {
+			UUID.randomUUID();
+		}
+		stopWatch.stop();
+		System.out.println("Generated 10000 UUID  (sync) via UUID.randomUUID(): in " + stopWatch.getTotalTimeSeconds() + " seconds");
+	}
+	@Test
+	public void performanceTestAsynch() throws Exception {
+		ExecutorService executor = Executors.newFixedThreadPool(1);
+		StopWatch stopWatch = new StopWatch();
+		stopWatch.start();
+		for (int i = 0; i < 10000; i++) {
+			executor.execute(new Runnable() {
+				public void run() {
+					TimeBasedUUIDGenerator.generateId();
+				}
+			});
+		}
+		executor.shutdown();
+		executor.awaitTermination(10, TimeUnit.SECONDS);
+		stopWatch.stop();
+		System.out.println("Generated 10000 UUID (async) via TimeBasedUUIDGenerator.generateId(): in " + stopWatch.getTotalTimeSeconds() + " seconds");
+		
+		executor = Executors.newFixedThreadPool(1);
+		stopWatch = new StopWatch();
+		stopWatch.start();
+		for (int i = 0; i < 10000; i++) {
+			executor.execute(new Runnable() {
+				public void run() {
+					UUID.randomUUID();
+				}
+			});
+		}
+		executor.shutdown();
+		executor.awaitTermination(10, TimeUnit.SECONDS);
+		stopWatch.stop();
+		System.out.println("Generated 10000 UUID (async) via UUID.randomUUID(): in " + stopWatch.getTotalTimeSeconds() + " seconds");
+	}
 }