metrics command to dump all the Metric in the system.

- Add probe to measure the time spent querying for Mastership.

Change-Id: I48fe37568a3261ee5b6229a3884e42a3a741b407

+/*
+ * Copyright 2014 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.onlab.onos.cli;
+
+import static java.lang.String.format;
+
+import java.util.Comparator;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.karaf.shell.commands.Command;
+import org.joda.time.LocalDateTime;
+import org.onlab.metrics.MetricsService;
+
+import com.codahale.metrics.Counter;
+import com.codahale.metrics.Gauge;
+import com.codahale.metrics.Histogram;
+import com.codahale.metrics.Meter;
+import com.codahale.metrics.Metric;
+import com.codahale.metrics.MetricFilter;
+import com.codahale.metrics.Snapshot;
+import com.codahale.metrics.Timer;
+import com.google.common.base.Strings;
+import com.google.common.collect.Ordering;
+import com.google.common.collect.TreeMultimap;
+
+/**
+ * Prints metrics in the system.
+ */
+@Command(scope = "onos", name = "metrics",
+         description = "Prints metrics in the system")
+public class MetricsListCommand extends AbstractShellCommand {
+
+    @Override
+    protected void execute() {
+        MetricsService metricsService = get(MetricsService.class);
+
+        // TODO support filter condition
+        MetricFilter filter = MetricFilter.ALL;
+
+        TreeMultimap<String, Metric> matched = listMetrics(metricsService, filter);
+        matched.asMap().forEach((name, metrics) -> {
+            for (Metric metric : metrics) {
+                // TODO JSON version
+                printMetric(name, metric);
+            }
+        });
+    }
+
+    /**
+     * Print metric object.
+     *
+     * @param name metric name
+     * @param metric metric object
+     */
+    private void printMetric(String name, Metric metric) {
+        final String heading;
+
+        if (metric instanceof Counter) {
+            heading = format("-- %s : [%s] --", name, "Counter");
+            print(heading);
+            Counter counter = (Counter) metric;
+            print("          count = %d", counter.getCount());
+
+        } else if (metric instanceof Gauge) {
+            heading = format("-- %s : [%s] --", name, "Gauge");
+            print(heading);
+            @SuppressWarnings("rawtypes")
+            Gauge gauge = (Gauge) metric;
+            final Object value = gauge.getValue();
+            if (name.endsWith("EpochMs") && value instanceof Long) {
+                print("          value = %s (%s)", value, new LocalDateTime(value));
+            } else {
+                print("          value = %s", value);
+            }
+
+        } else if (metric instanceof Histogram) {
+            heading = format("-- %s : [%s] --", name, "Histogram");
+            print(heading);
+            final Histogram histogram = (Histogram) metric;
+            final Snapshot snapshot = histogram.getSnapshot();
+            print("          count = %d", histogram.getCount());
+            print("            min = %d", snapshot.getMin());
+            print("            max = %d", snapshot.getMax());
+            print("           mean = %f", snapshot.getMean());
+            print("         stddev = %f", snapshot.getStdDev());
+
+        } else if (metric instanceof Meter) {
+            heading = format("-- %s : [%s] --", name, "Meter");
+            print(heading);
+            final Meter meter = (Meter) metric;
+            print("          count = %d", meter.getCount());
+            print("      mean rate = %f", meter.getMeanRate());
+            print("  1-minute rate = %f", meter.getOneMinuteRate());
+            print("  5-minute rate = %f", meter.getFiveMinuteRate());
+            print(" 15-minute rate = %f", meter.getFifteenMinuteRate());
+
+        } else if (metric instanceof Timer) {
+            heading = format("-- %s : [%s] --", name, "Timer");
+            print(heading);
+            final Timer timer = (Timer) metric;
+            final Snapshot snapshot = timer.getSnapshot();
+            print("          count = %d", timer.getCount());
+            print("      mean rate = %f", timer.getMeanRate());
+            print("  1-minute rate = %f", timer.getOneMinuteRate());
+            print("  5-minute rate = %f", timer.getFiveMinuteRate());
+            print(" 15-minute rate = %f", timer.getFifteenMinuteRate());
+            print("            min = %f ms", nanoToMs(snapshot.getMin()));
+            print("            max = %f ms", nanoToMs(snapshot.getMax()));
+            print("           mean = %f ms", nanoToMs(snapshot.getMean()));
+            print("         stddev = %f ms", nanoToMs(snapshot.getStdDev()));
+        } else {
+            heading = format("-- %s : [%s] --", name, metric.getClass().getCanonicalName());
+            print(heading);
+            print("Unknown Metric type:{}", metric.getClass().getCanonicalName());
+        }
+        print(Strings.repeat("-", heading.length()));
+    }
+
+    @SuppressWarnings("rawtypes")
+    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 (Entry<String, Counter> entry : counters.entrySet()) {
+            metrics.put(entry.getKey(), entry.getValue());
+        }
+        Map<String, Gauge> gauges = metricsService.getGauges(filter);
+        for (Entry<String, Gauge> entry : gauges.entrySet()) {
+            metrics.put(entry.getKey(), entry.getValue());
+        }
+        Map<String, Histogram> histograms = metricsService.getHistograms(filter);
+        for (Entry<String, Histogram> entry : histograms.entrySet()) {
+            metrics.put(entry.getKey(), entry.getValue());
+        }
+        Map<String, Meter> meters = metricsService.getMeters(filter);
+        for (Entry<String, Meter> entry : meters.entrySet()) {
+            metrics.put(entry.getKey(), entry.getValue());
+        }
+        Map<String, Timer> timers = metricsService.getTimers(filter);
+        for (Entry<String, Timer> entry : timers.entrySet()) {
+            metrics.put(entry.getKey(), entry.getValue());
+        }
+
+        return metrics;
+    }
+
+    private double nanoToMs(double nano) {
+        return nano / 1_000_000D;
+    }
+}

@@ -19,6 +19,11 @@
         <command>
             <action class="org.onlab.onos.cli.SummaryCommand"/>
         </command>
+
+        <command>
+            <action class="org.onlab.onos.cli.MetricsListCommand"/>
+        </command>
+
         <command>
             <action class="org.onlab.onos.cli.TabletMemberCommand"/>
         </command>

@@ -27,6 +27,9 @@ import org.apache.felix.scr.annotations.Deactivate;
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
+import org.onlab.metrics.MetricsComponent;
+import org.onlab.metrics.MetricsFeature;
+import org.onlab.metrics.MetricsService;
 import org.onlab.onos.cluster.ClusterEvent;
 import org.onlab.onos.cluster.ClusterEventListener;
 import org.onlab.onos.cluster.ClusterService;
@@ -47,6 +50,9 @@ import org.onlab.onos.net.DeviceId;
 import org.onlab.onos.net.MastershipRole;
 import org.slf4j.Logger;
 
+import com.codahale.metrics.Timer;
+import com.codahale.metrics.Timer.Context;
+
 @Component(immediate = true)
 @Service
 public class MastershipManager
@@ -72,10 +78,16 @@ public class MastershipManager
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ClusterService clusterService;
 
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MetricsService metricsService;
+
     private ClusterEventListener clusterListener = new InternalClusterEventListener();
+    private Timer requestRoleTimer;
 
     @Activate
     public void activate() {
+        requestRoleTimer = createTimer("Mastership", "requestRole", "responseTime");
+
         eventDispatcher.addSink(MastershipEvent.class, listenerRegistry);
         clusterService.addListener(clusterListener);
         store.setDelegate(delegate);
@@ -137,7 +149,12 @@ public class MastershipManager
     @Override
     public MastershipRole requestRoleFor(DeviceId deviceId) {
         checkNotNull(deviceId, DEVICE_ID_NULL);
-        return store.requestRole(deviceId);
+        final Context timer = startTimer(requestRoleTimer);
+        try {
+            return store.requestRole(deviceId);
+        } finally {
+            stopTimer(timer);
+        }
     }
 
     @Override
@@ -186,6 +203,28 @@ public class MastershipManager
 
 
 
+    private Timer createTimer(String component, String feature, String name) {
+        if (metricsService != null) {
+            MetricsComponent c = metricsService.registerComponent(component);
+            MetricsFeature f = c.registerFeature(feature);
+            return metricsService.createTimer(c, f, name);
+        }
+        return null;
+    }
+
+    private static final Context startTimer(Timer timer) {
+        if (timer != null) {
+            return timer.time();
+        }
+        return null;
+    }
+
+    private static final void stopTimer(Context context) {
+        if (context != null) {
+            context.stop();
+        }
+    }
+
     //callback for reacting to cluster events
     private class InternalClusterEventListener implements ClusterEventListener {
 

@@ -154,7 +154,7 @@ public class MetricsManager implements MetricsService {
      * Creates a Timer metric.
      *
      * @param component component the Timer is defined in
-     * @param feature feature the Timeer is defined in
+     * @param feature feature the Timer is defined in
      * @param metricName local name of the metric
      * @return the created Timer Metric
      */