Improvements in ThreadLocalStorage

1 files changed, 81 insertions, 0 deletions

diff --git a/kamon-core-bench/src/main/scala/kamon/bench/ThreadLocalStorageBenchmark.scala b/kamon-core-bench/src/main/scala/kamon/bench/ThreadLocalStorageBenchmark.scala
new file mode 100644
index 00000000..96588798
--- /dev/null
+++ b/kamon-core-bench/src/main/scala/kamon/bench/ThreadLocalStorageBenchmark.scala
@@ -0,0 +1,81 @@
+/* =========================================================================================
+ * Copyright © 2013-2018 the kamon project <http://kamon.io/>
+ *
+ * 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 kamon.bench
+
+import java.util.concurrent.TimeUnit
+
+import kamon.context.Storage.Scope
+import kamon.context.{Context, Key, Storage}
+import org.openjdk.jmh.annotations._
+
+@State(Scope.Benchmark	)
+class ThreadLocalStorageBenchmark {
+
+  val TestKey: Key[Int] = Key.local("test-key", 0)
+  val ScopeWithKey: Context = Context.create().withKey(TestKey, 43)
+
+  val TLS: Storage =  new OldThreadLocal
+  val FTLS: Storage =  new Storage.ThreadLocal
+
+
+  @Benchmark
+  @BenchmarkMode(Array(Mode.AverageTime))
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  @Fork
+  def currentThreadLocal: Context = {
+    val scope = TLS.store(ScopeWithKey)
+    TLS.current()
+    scope.close()
+    TLS.current()
+  }
+
+  @Benchmark
+  @BenchmarkMode(Array(Mode.AverageTime))
+  @OutputTimeUnit(TimeUnit.NANOSECONDS)
+  @Fork
+  def fastThreadLocal: Context = {
+    val scope = FTLS.store(ScopeWithKey)
+    FTLS.current()
+    scope.close()
+    FTLS.current()
+  }
+}
+
+
+class OldThreadLocal extends Storage {
+  private val tls = new java.lang.ThreadLocal[Context]() {
+    override def initialValue(): Context = Context.Empty
+  }
+
+  override def current(): Context =
+    tls.get()
+
+  override def store(context: Context): Scope = {
+    val newContext = context
+    val previousContext = tls.get()
+    tls.set(newContext)
+
+    new Scope {
+      override def context: Context = newContext
+      override def close(): Unit = tls.set(previousContext)
+    }
+  }
+}
+
+object OldThreadLocal {
+  def apply(): OldThreadLocal = new OldThreadLocal()
+}
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