benchmarks: add benchmark for org.dcache.nfs.util.Cache

Acked-by: Marina Sahakyan
Target: master

benchmarks/src/main/java/org/dcache/nfs/benchmarks/CacheBenchmark.java

@@ -0,0 +1,74 @@
+package org.dcache.nfs.benchmarks;
+
+import org.dcache.nfs.util.Cache;
+import org.dcache.nfs.util.NopCacheEventListener;
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+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.Threads;
+import org.openjdk.jmh.annotations.Warmup;
+import org.openjdk.jmh.results.format.ResultFormatType;
+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.concurrent.TimeUnit;
+
+@BenchmarkMode(Mode.Throughput)
+public class CacheBenchmark {
+
+    @State(Scope.Benchmark)
+    public static class CacheHolder {
+
+        private Cache<String, String> cache;
+
+        @Setup
+        public void setUp() {
+            cache = new Cache<>("test cache", 64, Integer.MAX_VALUE,
+                    Integer.MAX_VALUE,
+                    new NopCacheEventListener());
+            cache.put("foo", "bar");
+        }
+
+        public Cache<String, String> getCache() {
+            return cache;
+        }
+    }
+
+    @Benchmark
+    @Threads(16)
+    @Warmup(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
+    public long cachePutRemoveBenchmark(CacheHolder cacheHolder) {
+
+        final var cache = cacheHolder.getCache();
+        var key = "key";
+        var val = "val";
+
+        cache.put(key, val);
+        cache.remove(key);
+
+        return cache.lastClean();
+    }
+
+    @Benchmark
+    @Threads(16)
+    @Warmup(iterations = 5, time = 100, timeUnit = TimeUnit.MILLISECONDS)
+    public String cacheGetBenchmark(CacheHolder cacheHolder) {
+
+        final var cache = cacheHolder.getCache();
+        return cache.get("foo");
+    }
+
+    public static void main(String[] args) throws RunnerException {
+        Options opt = new OptionsBuilder()
+                .include(CacheBenchmark.class.getSimpleName())
+                .resultFormat(ResultFormatType.JSON)
+                .build();
+
+        new Runner(opt).run();
+    }
+}