allow Histograms and Summaries to time Callables

simpleclient/src/main/java/io/prometheus/client/Gauge.java

@@ -5,6 +5,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.Callable;
 
 /**
  * Gauge metric, to report instantaneous values.
@@ -193,7 +194,7 @@ public Timer startTimer() {
     }
 
     /**
-     * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+     * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
      *
      * @param timeable Code that is being timed
      * @return Measured duration in seconds for timeable to complete.
@@ -211,6 +212,24 @@ public double setToTime(Runnable timeable){
       return elapsed;
     }
 
+    /**
+     * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+     *
+     * @param timeable Code that is being timed
+     * @return Result returned by callable.
+     */
+    public <E> E setToTime(Callable<E> timeable){
+      Timer timer = startTimer();
+
+      try {
+        return timeable.call();
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      } finally {
+        timer.setDuration();
+      }
+    }
+
     /**
      * Get the value of the gauge.
      */
@@ -272,15 +291,25 @@ public Timer startTimer() {
   }
 
   /**
-   * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+   * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
    *
    * @param timeable Code that is being timed
    * @return Measured duration in seconds for timeable to complete.
    */
   public double setToTime(Runnable timeable){
     return noLabelsChild.setToTime(timeable);
   }
-
+
+  /**
+   * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+   *
+   * @param timeable Code that is being timed
+   * @return Result returned by callable.
+   */
+  public <E> E setToTime(Callable<E> timeable){
+    return noLabelsChild.setToTime(timeable);
+  }
+
   /**
    * Get the value of the gauge.
    */

simpleclient/src/main/java/io/prometheus/client/Histogram.java

@@ -5,6 +5,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.Callable;
 
 /**
  * Histogram metric, to track distributions of events.
@@ -190,7 +191,7 @@ public void close() {
   public static class Child {
 
     /**
-     * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+     * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
      *
      * @param timeable Code that is being timed
      * @return Measured duration in seconds for timeable to complete.
@@ -207,6 +208,24 @@ public double time(Runnable timeable) {
       return elapsed;
     }
 
+    /**
+     * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+     *
+     * @param timeable Code that is being timed
+     * @return Result returned by callable.
+     */
+    public <E> E time(Callable<E> timeable) {
+      Timer timer = startTimer();
+
+      try {
+        return timeable.call();
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      } finally {
+        timer.observeDuration();
+      }
+    }
+
     public static class Value {
       public final double sum;
       public final double[] buckets;
@@ -283,7 +302,7 @@ public Timer startTimer() {
   }
 
   /**
-   * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+   * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
    *
    * @param timeable Code that is being timed
    * @return Measured duration in seconds for timeable to complete.
@@ -292,6 +311,16 @@ public double time(Runnable timeable){
     return noLabelsChild.time(timeable);
   }
 
+  /**
+   * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+   *
+   * @param timeable Code that is being timed
+   * @return Result returned by callable.
+   */
+  public <E> E time(Callable<E> timeable){
+    return noLabelsChild.time(timeable);
+  }
+
   @Override
   public List<MetricFamilySamples> collect() {
     List<MetricFamilySamples.Sample> samples = new ArrayList<MetricFamilySamples.Sample>();

simpleclient/src/main/java/io/prometheus/client/Summary.java

@@ -9,6 +9,7 @@
 import java.util.Map;
 import java.util.SortedMap;
 import java.util.TreeMap;
+import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -197,7 +198,7 @@ public void close() {
   public static class Child {
 
     /**
-     * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+     * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
      *
      * @param timeable Code that is being timed
      * @return Measured duration in seconds for timeable to complete.
@@ -214,6 +215,24 @@ public double time(Runnable timeable) {
       return elapsed;
     }
 
+    /**
+     * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+     *
+     * @param timeable Code that is being timed
+     * @return Result returned by callable.
+     */
+    public <E> E time(Callable<E> timeable) {
+      Timer timer = startTimer();
+
+      try {
+        return timeable.call();
+      } catch (Exception e) {
+        throw new RuntimeException(e);
+      } finally {
+        timer.observeDuration();
+      }
+    }
+
     public static class Value {
       public final double count;
       public final double sum;
@@ -297,15 +316,25 @@ public Timer startTimer() {
   }
 
   /**
-   * Executes runnable code (i.e. a Java 8 Lambda) and observes a duration of how long it took to run.
+   * Executes runnable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
    *
    * @param timeable Code that is being timed
    * @return Measured duration in seconds for timeable to complete.
    */
   public double time(Runnable timeable){
     return noLabelsChild.time(timeable);
   }
-
+
+  /**
+   * Executes callable code (e.g. a Java 8 Lambda) and observes a duration of how long it took to run.
+   *
+   * @param timeable Code that is being timed
+   * @return Result returned by callable.
+   */
+  public <E> E time(Callable<E> timeable){
+    return noLabelsChild.time(timeable);
+  }
+
   /**
    * Get the value of the Summary.
    * <p>

simpleclient/src/test/java/io/prometheus/client/GaugeTest.java

@@ -4,6 +4,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Callable;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -29,7 +30,7 @@ public void tearDown() {
   private double getValue() {
     return registry.getSampleValue("nolabels").doubleValue();
   }
-  
+
   @Test
   public void testIncrement() {
     noLabels.inc();
@@ -45,7 +46,7 @@ public void testIncrement() {
     assertEquals(8.0, getValue(), .001);
     assertEquals(8.0, noLabels.get(), .001);
   }
-    
+
   @Test
   public void testDecrement() {
     noLabels.dec();
@@ -57,7 +58,7 @@ public void testDecrement() {
     noLabels.labels().dec();
     assertEquals(-8.0, getValue(), .001);
   }
-  
+
   @Test
   public void testSet() {
     noLabels.set(42);
@@ -93,8 +94,18 @@ public void run() {
         //no op
       }
     });
+    assertEquals(10, getValue(), .001);
     assertEquals(10, elapsed, .001);
 
+    int result = noLabels.setToTime(new Callable<Integer>() {
+      @Override
+      public Integer call() {
+        return 123;
+      }
+    });
+    assertEquals(123, result);
+    assertEquals(10, getValue(), .001);
+
     Gauge.Timer timer = noLabels.startTimer();
     elapsed = timer.setDuration();
     assertEquals(10, getValue(), .001);
@@ -105,7 +116,7 @@ public void run() {
   public void noLabelsDefaultZeroValue() {
     assertEquals(0.0, getValue(), .001);
   }
-  
+
   private Double getLabelsValue(String labelValue) {
     return registry.getSampleValue("labels", new String[]{"l"}, new String[]{labelValue});
   }
@@ -126,7 +137,7 @@ public void testLabels() {
   public void testCollect() {
     labels.labels("a").inc();
     List<Collector.MetricFamilySamples> mfs = labels.collect();
-    
+
     ArrayList<Collector.MetricFamilySamples.Sample> samples = new ArrayList<Collector.MetricFamilySamples.Sample>();
     ArrayList<String> labelNames = new ArrayList<String>();
     labelNames.add("l");

simpleclient/src/test/java/io/prometheus/client/HistogramTest.java

@@ -8,6 +8,7 @@
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Callable;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -37,11 +38,11 @@ private double getSum() {
     return registry.getSampleValue("nolabels_sum").doubleValue();
   }
   private double getBucket(double b) {
-    return registry.getSampleValue("nolabels_bucket", 
+    return registry.getSampleValue("nolabels_bucket",
         new String[]{"le"},
         new String[]{Collector.doubleToGoString(b)}).doubleValue();
   }
-  
+
   @Test
   public void testObserve() {
     noLabels.observe(2);
@@ -119,19 +120,27 @@ public void run() {
     });
     assertEquals(10, elapsed, .001);
 
+    int result = noLabels.time(new Callable<Integer>() {
+      @Override
+      public Integer call() {
+        return 123;
+      }
+    });
+    assertEquals(123, result);
+
     Histogram.Timer timer = noLabels.startTimer();
     elapsed = timer.observeDuration();
-    assertEquals(2, getCount(), .001);
-    assertEquals(20, getSum(), .001);
+    assertEquals(3, getCount(), .001);
+    assertEquals(30, getSum(), .001);
     assertEquals(10, elapsed, .001);
   }
-  
+
   @Test
   public void noLabelsDefaultZeroValue() {
     assertEquals(0.0, getCount(), .001);
     assertEquals(0.0, getSum(), .001);
   }
-  
+
   private Double getLabelsCount(String labelValue) {
     return registry.getSampleValue("labels_count", new String[]{"l"}, new String[]{labelValue});
   }
@@ -166,7 +175,7 @@ public void testLeLabelThrows() {
   public void testCollect() {
     labels.labels("a").observe(2);
     List<Collector.MetricFamilySamples> mfs = labels.collect();
-    
+
     ArrayList<Collector.MetricFamilySamples.Sample> samples = new ArrayList<Collector.MetricFamilySamples.Sample>();
     ArrayList<String> labelNames = new ArrayList<String>();
     labelNames.add("l");

simpleclient/src/test/java/io/prometheus/client/SummaryTest.java

@@ -8,6 +8,7 @@
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.Callable;
 
 import static java.util.Arrays.asList;
 import static org.junit.Assert.assertEquals;
@@ -124,19 +125,27 @@ public void run() {
     });
     assertEquals(10, elapsed, .001);
 
+    int result = noLabels.time(new Callable<Integer>() {
+      @Override
+      public Integer call() {
+        return 123;
+      }
+    });
+    assertEquals(123, result);
+
     Summary.Timer timer = noLabels.startTimer();
     elapsed = timer.observeDuration();
-    assertEquals(2, getCount(), .001);
-    assertEquals(20, getSum(), .001);
+    assertEquals(3, getCount(), .001);
+    assertEquals(30, getSum(), .001);
     assertEquals(10, elapsed, .001);
   }
-  
+
   @Test
   public void noLabelsDefaultZeroValue() {
     assertEquals(0.0, getCount(), .001);
     assertEquals(0.0, getSum(), .001);
   }
-  
+
   private Double getLabelsCount(String labelValue) {
     return registry.getSampleValue("labels_count", new String[]{"l"}, new String[]{labelValue});
   }