1 files changed, 23 insertions, 0 deletions
diff --git a/container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/OneTimeRunnable.java b/container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/OneTimeRunnable.java
new file mode 100644
index 00000000000..eb83d3d7d03
--- /dev/null
+++ b/container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/OneTimeRunnable.java
@@ -0,0 +1,23 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.jdisc.http.server.jetty;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * @author Tony Vaagenes
+ */
+public class OneTimeRunnable {
+    private final Runnable runnable;
+    private final AtomicBoolean hasRun = new AtomicBoolean(false);
+
+    public OneTimeRunnable(Runnable runnable) {
+        this.runnable = runnable;
+    }
+
+    public void runIfFirstInvocation() {
+        boolean previous = hasRun.getAndSet(true);
+        if (!previous) {
+            runnable.run();
+        }
+    }
+}