[Falcon][ONOS-3601] Add REST API for metrics service with unit test
Change-Id: I33ec561d1d83c6f1167e960bc2f684a117e6ea9c
diff --git a/core/common/src/main/java/org/onosproject/codec/impl/MetricCodec.java b/core/common/src/main/java/org/onosproject/codec/impl/MetricCodec.java
new file mode 100644
index 0000000..2f0b4d8
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+++ b/core/common/src/main/java/org/onosproject/codec/impl/MetricCodec.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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 org.onosproject.codec.impl;
+
+import com.codahale.metrics.Counter;
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.Metric;
+import com.codahale.metrics.Histogram;
+import com.codahale.metrics.Timer;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+/**
+ * Codec for the Metric class.
+ */
+public class MetricCodec extends JsonCodec<Metric> {
+
+ // JSON field names
+ private static final String COUNTER = "counter";
+
+ private static final String GAUGE = "gauge";
+ private static final String VALUE = "value";
+
+ private static final String METER = "meter";
+ private static final String MEAN_RATE = "mean_rate";
+ private static final String ONE_MIN_RATE = "1_min_rate";
+ private static final String FIVE_MIN_RATE = "5_min_rate";
+ private static final String FIFT_MIN_RATE = "15_min_rate";
+
+ private static final String HISTOGRAM = "histogram";
+ private static final String MIN = "min";
+ private static final String MAX = "max";
+ private static final String MEAN = "mean";
+ private static final String STDDEV = "stddev";
+
+ private static final String TIMER = "timer";
+
+ @Override
+ public ObjectNode encode(Metric metric, CodecContext context) {
+ checkNotNull(metric, "Metric cannot be null");
+
+ ObjectNode objectNode = context.mapper().createObjectNode();
+ ObjectNode dataNode = context.mapper().createObjectNode();
+
+ if (metric instanceof Counter) {
+ dataNode.put(COUNTER, ((Counter) metric).getCount());
+ objectNode.set(COUNTER, dataNode);
+ } else if (metric instanceof Gauge) {
+ objectNode.put(VALUE, ((Gauge) metric).getValue().toString());
+ objectNode.set(GAUGE, dataNode);
+ } else if (metric instanceof Meter) {
+ dataNode.put(COUNTER, ((Meter) metric).getCount());
+ dataNode.put(MEAN_RATE, ((Meter) metric).getMeanRate());
+ dataNode.put(ONE_MIN_RATE, ((Meter) metric).getOneMinuteRate());
+ dataNode.put(FIVE_MIN_RATE, ((Meter) metric).getFiveMinuteRate());
+ dataNode.put(FIFT_MIN_RATE, ((Meter) metric).getFifteenMinuteRate());
+ objectNode.set(METER, dataNode);
+ } else if (metric instanceof Histogram) {
+ dataNode.put(COUNTER, ((Histogram) metric).getCount());
+ dataNode.put(MEAN, ((Histogram) metric).getSnapshot().getMean());
+ dataNode.put(MIN, ((Histogram) metric).getSnapshot().getMin());
+ dataNode.put(MAX, ((Histogram) metric).getSnapshot().getMax());
+ dataNode.put(STDDEV, ((Histogram) metric).getSnapshot().getStdDev());
+ objectNode.set(HISTOGRAM, dataNode);
+ } else if (metric instanceof Timer) {
+ dataNode.put(COUNTER, ((Timer) metric).getCount());
+ dataNode.put(MEAN_RATE, ((Timer) metric).getMeanRate());
+ dataNode.put(ONE_MIN_RATE, ((Timer) metric).getOneMinuteRate());
+ dataNode.put(FIVE_MIN_RATE, ((Timer) metric).getFiveMinuteRate());
+ dataNode.put(FIFT_MIN_RATE, ((Timer) metric).getFifteenMinuteRate());
+ dataNode.put(MEAN, nanoToMs(((Timer) metric).getSnapshot().getMean()));
+ dataNode.put(MIN, nanoToMs(((Timer) metric).getSnapshot().getMin()));
+ dataNode.put(MAX, nanoToMs(((Timer) metric).getSnapshot().getMax()));
+ dataNode.put(STDDEV, nanoToMs(((Timer) metric).getSnapshot().getStdDev()));
+ objectNode.set(TIMER, dataNode);
+ }
+ return objectNode;
+ }
+
+ private double nanoToMs(double nano) {
+ return nano / 1_000_000D;
+ }
+}