Added null implementations for metric wrappers

3 files changed, 53 insertions, 1 deletions

diff --git a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/CounterWrapper.java b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/CounterWrapper.java
index 7cfeb3d670e..0b3b4d8ada9 100644
--- a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/CounterWrapper.java
+++ b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/CounterWrapper.java
@@ -26,4 +26,18 @@ public class CounterWrapper implements MetricValue {
     public Number getValue() {
         return value;
     }
-}
+
+
+    static final class NullCounter extends CounterWrapper {
+        NullCounter() {
+            super(null);
+        }
+
+        @Override
+        public void add() {
+        }
+
+        public void add(long n) {
+        }
+    }
+}
\ No newline at end of file
diff --git a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/GaugeWrapper.java b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/GaugeWrapper.java
index 4d9d00dcb0b..9ef37132b14 100644
--- a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/GaugeWrapper.java
+++ b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/GaugeWrapper.java
@@ -19,4 +19,15 @@ public class GaugeWrapper implements MetricValue {
     public Number getValue() {
         return value;
     }
+
+
+    final static class NullGauge extends GaugeWrapper {
+        NullGauge() {
+            super(null);
+        }
+
+        @Override
+        public void sample(double x) {
+        }
+    }
 }
diff --git a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/MetricReceiverWrapper.java b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/MetricReceiverWrapper.java
index a7923bf4526..eb1cf31d8e9 100644
--- a/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/MetricReceiverWrapper.java
+++ b/docker-api/src/main/java/com/yahoo/vespa/hosted/dockerapi/metrics/MetricReceiverWrapper.java
@@ -3,6 +3,7 @@ package com.yahoo.vespa.hosted.dockerapi.metrics;
 import com.google.inject.Inject;
 import com.yahoo.metrics.simple.MetricReceiver;
 
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -12,6 +13,8 @@ import java.util.Set;
  * @author valerijf
  */
 public class MetricReceiverWrapper {
+    public static final MetricReceiverWrapper nullImplementation = new MetricReceiverWrapper.NullReceiver();
+
     private final Map<String, MetricValue> metrics = new HashMap<>();
     private final MetricReceiver metricReceiver;
 
@@ -39,4 +42,28 @@ public class MetricReceiverWrapper {
     public MetricValue getMetricByName(String name) {
         return metrics.get(name);
     }
+
+
+    private static final class NullReceiver extends MetricReceiverWrapper {
+        NullReceiver() {
+            super(null);
+        }
+
+        @Override
+        public CounterWrapper declareCounter(String name) {
+            return new CounterWrapper.NullCounter();
+        }
+
+        public GaugeWrapper declageGauge(String name) {
+            return new GaugeWrapper.NullGauge();
+        }
+
+        public Set<String> getMetricNames() {
+            return Collections.emptySet();
+        }
+
+        public MetricValue getMetricByName(String name) {
+            return null;
+        }
+    }
 }