1 files changed, 85 insertions, 0 deletions
diff --git a/testing/src/main/java/io/perfmark/testing/GeneratorBenchmark.java b/testing/src/main/java/io/perfmark/testing/GeneratorBenchmark.java
new file mode 100644
index 0000000..fd3eca5
--- /dev/null
+++ b/testing/src/main/java/io/perfmark/testing/GeneratorBenchmark.java
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.perfmark.testing;
+
+import io.perfmark.impl.Generator;
+import java.util.concurrent.TimeUnit;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.GroupThreads;
+import org.openjdk.jmh.annotations.Level;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+
+@State(Scope.Benchmark)
+public class GeneratorBenchmark {
+
+  private Generator generator;
+
+  @Setup(Level.Trial)
+  public void setUp() {
+    generator = getGenerator();
+    generator.setGeneration(Generator.FAILURE);
+  }
+
+  protected Generator getGenerator() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  public void ifEnabled() {
+    if (isEnabled(getGeneration())) {
+      Blackhole.consumeCPU(1000);
+    }
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  public long getGeneration() {
+    return generator.getGeneration();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  public long getAndSetAndGetGeneration() {
+    long oldGeneration = generator.getGeneration();
+    generator.setGeneration(oldGeneration + 1);
+    return generator.getGeneration();
+  }
+
+  @Benchmark
+  @BenchmarkMode(Mode.AverageTime)
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  @GroupThreads(3)
+  public long racyGetAndSetAndGetGeneration() {
+    long oldGeneration = generator.getGeneration();
+    generator.setGeneration(oldGeneration + 1);
+    return generator.getGeneration();
+  }
+
+  protected static boolean isEnabled(long gen) {
+    return ((gen >>> Generator.GEN_OFFSET) & 0x1L) != 0L;
+  }
+}