1 files changed, 41 insertions, 0 deletions
diff --git a/vespajlib/src/main/java/com/yahoo/concurrent/SystemTimer.java b/vespajlib/src/main/java/com/yahoo/concurrent/SystemTimer.java
new file mode 100644
index 00000000000..5aa4990a86a
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/concurrent/SystemTimer.java
@@ -0,0 +1,41 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.concurrent;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * This is an implementation of {@link Timer} that is backed by an actual system timer.
+ *
+ * @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
+ */
+public enum SystemTimer implements Timer {
+
+    INSTANCE;
+
+    private volatile long millis;
+
+    private SystemTimer() {
+        millis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime());
+        Thread thread = new Thread() {
+
+            @Override
+            public void run() {
+                while (true) {
+                    millis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime());
+                    try {
+                        Thread.sleep(1);
+                    } catch (InterruptedException e) {
+                        break;
+                    }
+                }
+            }
+        };
+        thread.setDaemon(true);
+        thread.start();
+    }
+
+    @Override
+    public long milliTime() {
+        return millis;
+    }
+}