add JMH

Add benchmark for a comparison of the custom made removeAll
method vs an implementation that uses removeIf

build.gradle

@@ -1,3 +1,16 @@
+
+buildscript {
+  repositories {
+    maven {
+      url "https://plugins.gradle.org/m2/"
+    }
+  }
+  dependencies {
+    classpath "me.champeau.gradle:jmh-gradle-plugin:0.4.5"
+  }
+}
+
+
 apply plugin: 'java'
 apply plugin: 'eclipse'
 
@@ -9,6 +22,7 @@ subprojects {
 	apply plugin: 'eclipse'
 	apply plugin: 'maven'
 	apply plugin: 'maven-publish'
+	apply plugin: 'me.champeau.gradle.jmh'
 
 	// java compatibility version
 	sourceCompatibility = 1.8
@@ -49,6 +63,10 @@ subprojects {
 	dependencies {
 		testCompile group: 'junit', name: 'junit', version: '4.12'
 	}
+	
+	jmh {
+		jvmArgsAppend = "-ea"
+	}
 }
 
 task wrapper(type: Wrapper) {

primitiveCollections/src/jmh/java/org/lucares/collections/BenchmarkRemoveAll.java

@@ -0,0 +1,59 @@
+package org.lucares.collections;
+
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Fork;
+import org.openjdk.jmh.annotations.Measurement;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.annotations.TearDown;
+import org.openjdk.jmh.annotations.Warmup;
+
+@State(Scope.Benchmark)
+@BenchmarkMode(Mode.Throughput)
+@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)
+@Fork(1)
+public class BenchmarkRemoveAll {
+
+	private IntList base = null;
+	private IntList remove = null;
+
+	@Setup
+	public void setup() throws Exception {
+
+		final int values = 100_000;
+		base = IntList.of();
+		IntStream.range(0, values).forEachOrdered(i -> base.add(i));
+		base.sort();
+
+		remove = IntList.of();
+		IntStream.range(0, 50).forEachOrdered(i -> remove.add(i));
+		remove.sort();
+	}
+
+	@TearDown
+	public void tearDown() {
+		base = null;
+		remove = null;
+	}
+
+	@Benchmark
+	public void testRemoveAll() throws Exception {
+
+		final IntList tmp = base.clone();
+		tmp.removeAll(remove);
+	}
+
+	@Benchmark
+	public void testRemoveAll_withRemoveIf() throws Exception {
+
+		final IntList tmp = base.clone();
+		tmp.removeIf((val, index) -> remove.indexOf(val) >= 0);
+	}
+}