From ce26810b4abfc4456ba698714d63c38188a6d446 Mon Sep 17 00:00:00 2001
From: rohitchaudhary2023
 <57285851+rohitchaudhary2023@users.noreply.github.com>
Date: Wed, 1 Jan 2020 02:52:53 +0530
Subject: [PATCH] BAEL-3380 (#8454)

* initial commit

* changes for articlesBAEL-3380

* Removed evaluation article files

* BAEL-3380

* adding test case BAEL-3380

* BAEL-3380

* BAEL-3380 - updated tests and removed main class

* BAEL-3380 - Updated Test class name

* BAEL-3380 - Updated Test class name

* BAEL-3380 - Updated testcase names as per BDD naming convention

* BAEL 3380 - Added JMH benchmark
---
 core-java-modules/core-java-arrays-2/pom.xml  | 35 +++++++++
 .../arraysort/ArraySortingBenchmark.java      | 72 +++++++++++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 core-java-modules/core-java-arrays-2/src/main/java/com/baeldung/arraysort/ArraySortingBenchmark.java

diff --git a/core-java-modules/core-java-arrays-2/pom.xml b/core-java-modules/core-java-arrays-2/pom.xml
index 3f6b7094bb..532f0a6144 100644
--- a/core-java-modules/core-java-arrays-2/pom.xml
+++ b/core-java-modules/core-java-arrays-2/pom.xml
@@ -19,6 +19,16 @@
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
+        </dependency>
+		<dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-core</artifactId>
+            <version>${jmh.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.openjdk.jmh</groupId>
+            <artifactId>jmh-generator-annprocess</artifactId>
+            <version>${jmh.version}</version>
         </dependency>
         <!-- test scoped -->
         <dependency>
@@ -37,9 +47,34 @@
                 <filtering>true</filtering>
             </resource>
         </resources>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-shade-plugin</artifactId>
+				<version>3.2.0</version>
+				<executions>
+					<execution>
+						<phase>package</phase>
+						<goals>
+							<goal>shade</goal>
+						</goals>
+						<configuration>
+							<finalName>benchmarks</finalName>
+							<transformers>
+								<transformer
+										implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+									<mainClass>org.openjdk.jmh.Main</mainClass>
+								</transformer>
+							</transformers>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
     </build>
 
     <properties>
+		<jmh.version>1.19</jmh.version>
         <!-- util -->
         <commons-lang3.version>3.9</commons-lang3.version>
         <!-- testing -->
diff --git a/core-java-modules/core-java-arrays-2/src/main/java/com/baeldung/arraysort/ArraySortingBenchmark.java b/core-java-modules/core-java-arrays-2/src/main/java/com/baeldung/arraysort/ArraySortingBenchmark.java
new file mode 100644
index 0000000000..640d729020
--- /dev/null
+++ b/core-java-modules/core-java-arrays-2/src/main/java/com/baeldung/arraysort/ArraySortingBenchmark.java
@@ -0,0 +1,72 @@
+package com.baeldung.arraysort;
+
+import java.util.Arrays;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Param;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+@BenchmarkMode(Mode.AverageTime)
+@Warmup(iterations = 5)
+@Measurement(iterations = 10)
+@Fork(2)
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+public class ArraySortingBenchmark {
+
+    @State(Scope.Benchmark)
+    public static class ArrayContainer {
+
+        @Param({ "1000", "10000", "100000", "1000000" })
+        int arraySize;
+
+        // initial unsorted array
+        int[] unsortedArray;
+        
+        //cloned array to sort
+        int[] arrayToSort;
+
+        @Setup(Level.Trial)
+        public void createUnSortedArray() {
+            unsortedArray = new int[arraySize];
+            for (int i = 0; i < arraySize; i++) {
+                unsortedArray[i] = new Random().nextInt(1000);
+            }
+        }
+
+        @Setup(Level.Invocation)
+        public void createUnSortedArrayCopy() {
+            arrayToSort = unsortedArray.clone();
+        }
+
+        int[] getArrayToSort() {
+            return arrayToSort;
+        }
+    }
+
+    @Benchmark
+    public void benchmark_arrays_parallel_sort(ArrayContainer d, Blackhole b) {
+        int[] arr = d.getArrayToSort();
+        Arrays.parallelSort(arr);
+        b.consume(arr);
+    }
+
+    @Benchmark
+    public void benchmark_arrays_sort(ArrayContainer d, Blackhole b) {
+        int[] arr = d.getArrayToSort();
+        Arrays.sort(arr);
+        b.consume(arr);
+    }
+
+}