feat: JMHExample16

multithreading1/src/main/java/cn/bunny/jmh/JMHExample16.java

@@ -0,0 +1,66 @@
+package cn.bunny.jmh;
+
+import org.openjdk.jmh.annotations.*;
+import org.openjdk.jmh.runner.Runner;
+import org.openjdk.jmh.runner.RunnerException;
+import org.openjdk.jmh.runner.options.Options;
+import org.openjdk.jmh.runner.options.OptionsBuilder;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentSkipListMap;
+import java.util.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.AverageTime)
+@Fork(1)
+@Warmup(iterations = 5)
+@Measurement(iterations = 5)
+@OutputTimeUnit(TimeUnit.MICROSECONDS)
+@State(Scope.Group)
+public class JMHExample16 {
+    // 为type提供了4中可配置的参数值
+    @Param({"1", "2", "3", "4"})
+    private int type;
+
+    private Map<Integer, Integer> map;
+
+    public static void main(String[] args) throws RunnerException {
+        Options options = new OptionsBuilder()
+                .include(JMHExample16.class.getSimpleName())
+                .build();
+        new Runner(options).run();
+    }
+
+    @Setup
+    public void setup() {
+        switch (type) {
+            case 1:
+                this.map = new ConcurrentHashMap<>();
+                break;
+            case 2:
+                this.map = new ConcurrentSkipListMap<>();
+                break;
+            case 3:
+                this.map = new Hashtable<>();
+                break;
+            case 4:
+                this.map = Collections.synchronizedMap(new HashMap<>());
+                break;
+            default:
+                throw new IllegalArgumentException("Illegal map type");
+        }
+    }
+
+    @Group("g")
+    @GroupThreads(5)
+    @Benchmark
+    public void put() {
+        int num = new Random().nextInt();
+        this.map.put(num, num);
+    }
+
+    public Integer get() {
+        int num = new Random().nextInt();
+        return this.map.get(num);
+    }
+}