1 files changed, 43 insertions, 0 deletions
diff --git a/container-search/src/main/java/com/yahoo/search/dispatch/RequestDuration.java b/container-search/src/main/java/com/yahoo/search/dispatch/RequestDuration.java
new file mode 100644
index 00000000000..1206277a103
--- /dev/null
+++ b/container-search/src/main/java/com/yahoo/search/dispatch/RequestDuration.java
@@ -0,0 +1,43 @@
+// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.search.dispatch;
+
+import java.time.Duration;
+import java.time.Instant;
+
+/**
+ * Contains start and and time. Exposes a duration, and lets you measure the time difference between 2 requests.
+ * It does use System.nanoTime to get a steady clock.
+ *
+ * @author baldersheim
+ */
+class RequestDuration {
+    private final long startTime;
+    private long endTime;
+    RequestDuration() {
+        this(System.nanoTime());
+    }
+    private RequestDuration(long startTime) {
+        this.startTime = startTime;
+    }
+
+    RequestDuration complete() {
+        endTime = System.nanoTime();
+        return this;
+    }
+    private RequestDuration complete(long duration) {
+        endTime = startTime + duration;
+        return this;
+    }
+    Duration duration() {
+        return Duration.ofNanos(endTime - startTime);
+    }
+    Duration difference(RequestDuration prev) {
+        return Duration.ofNanos(Math.abs(endTime - prev.endTime));
+    }
+    static RequestDuration of(Duration duration) {
+        return new RequestDuration().complete(duration.toNanos());
+    }
+    static RequestDuration of(Instant sinceEpoch, Duration duration) {
+        return new RequestDuration(sinceEpoch.toEpochMilli()*1_000_000).complete(duration.toNanos());
+    }
+}