From 1ac7e203216efaf31147ae4820f086145836470f Mon Sep 17 00:00:00 2001
From: Nguyen Nam Thai <namthainguyen@gmail.com>
Date: Sat, 18 Jul 2020 21:56:20 +0700
Subject: [PATCH] BAEL-4113 Measure exception performance

---
 .../java/com/baeldung/ExceptionBenchmark.java | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 jmh/src/main/java/com/baeldung/ExceptionBenchmark.java

diff --git a/jmh/src/main/java/com/baeldung/ExceptionBenchmark.java b/jmh/src/main/java/com/baeldung/ExceptionBenchmark.java
new file mode 100644
index 0000000000..9a166fe2ce
--- /dev/null
+++ b/jmh/src/main/java/com/baeldung/ExceptionBenchmark.java
@@ -0,0 +1,69 @@
+package com.baeldung;
+
+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.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.concurrent.TimeUnit;
+
+@Fork(1)
+@Warmup(iterations = 2)
+@Measurement(iterations = 10)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+public class ExceptionBenchmark {
+    private static final int LIMIT = 10_000;
+
+    @Benchmark
+    public void doNotThrowException(Blackhole blackhole) {
+        for (int i = 0; i < LIMIT; i++) {
+            blackhole.consume(new Object());
+        }
+    }
+
+    @Benchmark
+    public void throwAndCatchException(Blackhole blackhole) {
+        for (int i = 0; i < LIMIT; i++) {
+            try {
+                throw new Exception();
+            } catch (Exception e) {
+                blackhole.consume(e);
+            }
+        }
+    }
+
+    @Benchmark
+    public void createExceptionWithoutThrowingIt(Blackhole blackhole) {
+        for (int i = 0; i < LIMIT; i++) {
+            blackhole.consume(new Exception());
+        }
+    }
+
+    @Benchmark
+    @Fork(value = 1, jvmArgs = "-XX:-StackTraceInThrowable")
+    public void throwExceptionWithoutAddingStackTrace(Blackhole blackhole) {
+        for (int i = 0; i < LIMIT; i++) {
+            try {
+                throw new Exception();
+            } catch (Exception e) {
+                blackhole.consume(e);
+            }
+        }
+    }
+
+    @Benchmark
+    public void throwExceptionAndUnwindStackTrace(Blackhole blackhole) {
+        for (int i = 0; i < LIMIT; i++) {
+            try {
+                throw new Exception();
+            } catch (Exception e) {
+                blackhole.consume(e.getStackTrace());
+            }
+        }
+    }
+}