[Falcon][ONOS-3601] Add REST API for metrics service with unit test
Change-Id: I33ec561d1d83c6f1167e960bc2f684a117e6ea9c
diff --git a/web/api/src/main/java/org/onosproject/rest/resources/MetricsWebResource.java b/web/api/src/main/java/org/onosproject/rest/resources/MetricsWebResource.java
new file mode 100644
index 0000000..2a221a4
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+++ b/web/api/src/main/java/org/onosproject/rest/resources/MetricsWebResource.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2014-2015 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.rest.resources;
+
+import com.codahale.metrics.Counter;
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.Metric;
+import com.codahale.metrics.Histogram;
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.Timer;
+import com.codahale.metrics.MetricFilter;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Ordering;
+import com.google.common.collect.TreeMultimap;
+import org.onlab.metrics.MetricsService;
+import org.onosproject.rest.AbstractWebResource;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.util.Comparator;
+import java.util.Map;
+
+/**
+ * Query metrics.
+ */
+@Path("metrics")
+public class MetricsWebResource extends AbstractWebResource {
+
+ final MetricsService service = get(MetricsService.class);
+ final ObjectNode root = mapper().createObjectNode();
+
+ /**
+ * Get stats information of all metrics. Returns array of all information for
+ * all metrics.
+ *
+ * @return metric information as array
+ * @onos.rsModel Metrics
+ */
+ @GET
+ @Produces(MediaType.APPLICATION_JSON)
+ public Response getAllMetrics() {
+ ArrayNode metricsNode = root.putArray("metrics");
+ service.getMetrics().forEach((name, metric) -> {
+ ObjectNode item = mapper().createObjectNode();
+ item.put("name", name);
+ item.set("metric", codec(Metric.class).encode(metric, this));
+ metricsNode.add(item);
+ });
+
+ return ok(root).build();
+ }
+
+ /**
+ * Get stats information of a metric. Returns array of all information for the
+ * specified metric.
+ *
+ * @param metricName metric name
+ * @return metric information as array
+ * @onos.rsModel Metric
+ */
+ @GET
+ @Produces(MediaType.APPLICATION_JSON)
+ @Path("{metricName}")
+ public Response getMetricByName(@PathParam("metricName") String metricName) {
+ ObjectNode metricNode = root.putObject("metric");
+ MetricFilter filter = metricName != null ? (name, metric) -> name.equals(metricName) : MetricFilter.ALL;
+ TreeMultimap<String, Metric> matched = listMetrics(service, filter);
+
+ matched.asMap().get(metricName).forEach(m -> {
+ metricNode.set(metricName, codec(Metric.class).encode(m, this));
+ });
+
+ return ok(root).build();
+ }
+
+ private TreeMultimap<String, Metric> listMetrics(MetricsService metricsService, MetricFilter filter) {
+ TreeMultimap<String, Metric> metrics = TreeMultimap.create(Comparator.naturalOrder(), Ordering.arbitrary());
+
+ Map<String, Counter> counters = metricsService.getCounters(filter);
+ for (Map.Entry<String, Counter> entry : counters.entrySet()) {
+ metrics.put(entry.getKey(), entry.getValue());
+ }
+ Map<String, Gauge> gauges = metricsService.getGauges(filter);
+ for (Map.Entry<String, Gauge> entry : gauges.entrySet()) {
+ metrics.put(entry.getKey(), entry.getValue());
+ }
+ Map<String, Histogram> histograms = metricsService.getHistograms(filter);
+ for (Map.Entry<String, Histogram> entry : histograms.entrySet()) {
+ metrics.put(entry.getKey(), entry.getValue());
+ }
+ Map<String, Meter> meters = metricsService.getMeters(filter);
+ for (Map.Entry<String, Meter> entry : meters.entrySet()) {
+ metrics.put(entry.getKey(), entry.getValue());
+ }
+ Map<String, Timer> timers = metricsService.getTimers(filter);
+ for (Map.Entry<String, Timer> entry : timers.entrySet()) {
+ metrics.put(entry.getKey(), entry.getValue());
+ }
+
+ return metrics;
+ }
+}