[sling-org-apache-sling-commons-metrics] 21/23: SLING-4080 - API to capture/measure application-level metrics

[ro...@apache.org]

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rombert pushed a commit to annotated tag org.apache.sling.commons.metrics-0.0.2
in repository https://gitbox.apache.org/repos/asf/sling-org-apache-sling-commons-metrics.git

commit 97878b971e370a1990e55de4c9b3d3c7893c2d36
Author: Chetan Mehrotra <ch...@apache.org>
AuthorDate: Thu Jan 7 11:31:58 2016 +0000

    SLING-4080 - API to capture/measure application-level metrics
    
    Allow adapting MetricService to MetricRegistry
    
    git-svn-id: https://svn.apache.org/repos/asf/sling/trunk/bundles/commons/metrics@1723518 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/sling/commons/metrics/MetricsService.java | 16 ++++++++++++++++
 .../commons/metrics/internal/MetricsServiceImpl.java     |  9 +++++++++
 .../commons/metrics/internal/MetricServiceTest.java      |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/src/main/java/org/apache/sling/commons/metrics/MetricsService.java b/src/main/java/org/apache/sling/commons/metrics/MetricsService.java
index 7848861..56e87e6 100644
--- a/src/main/java/org/apache/sling/commons/metrics/MetricsService.java
+++ b/src/main/java/org/apache/sling/commons/metrics/MetricsService.java
@@ -50,6 +50,11 @@ public interface MetricsService {
         public Meter meter(String name) {
             return NoopMetric.INSTANCE;
         }
+
+        @Override
+        public <A> A adaptTo(Class<A> type) {
+            return null;
+        }
     };
 
     /**
@@ -87,4 +92,15 @@ public interface MetricsService {
      * @return a new {@link Meter}
      */
     Meter meter(String name);
+
+    /**
+     * Adapts the service to the specified type. This can be used to
+     * get instance to underlying {@code MetricRegistry}
+     *
+     * @param <A> The type to which this metric is to be adapted.
+     * @param type Class object for the type to which this metric is to be adapted.
+     * @return The object, of the specified type, to which this metric has been adapted
+     * or null if this metric cannot be adapted to the specified type.
+     */
+    <A> A adaptTo(Class<A> type);
 }
diff --git a/src/main/java/org/apache/sling/commons/metrics/internal/MetricsServiceImpl.java b/src/main/java/org/apache/sling/commons/metrics/internal/MetricsServiceImpl.java
index 729d555..a0e0520 100644
--- a/src/main/java/org/apache/sling/commons/metrics/internal/MetricsServiceImpl.java
+++ b/src/main/java/org/apache/sling/commons/metrics/internal/MetricsServiceImpl.java
@@ -115,6 +115,15 @@ public class MetricsServiceImpl implements MetricsService {
     }
 
     @SuppressWarnings("unchecked")
+    @Override
+    public <A> A adaptTo(Class<A> type) {
+        if (type == MetricRegistry.class){
+            return (A) registry;
+        }
+        return null;
+    }
+
+    @SuppressWarnings("unchecked")
     private <T extends Metric> T getOrAdd(String name, MetricBuilder<T> builder) {
         final Metric metric = metrics.get(name);
         if (builder.isInstance(metric)) {
diff --git a/src/test/java/org/apache/sling/commons/metrics/internal/MetricServiceTest.java b/src/test/java/org/apache/sling/commons/metrics/internal/MetricServiceTest.java
index 7f1dec8..a028abf 100644
--- a/src/test/java/org/apache/sling/commons/metrics/internal/MetricServiceTest.java
+++ b/src/test/java/org/apache/sling/commons/metrics/internal/MetricServiceTest.java
@@ -59,6 +59,8 @@ public class MetricServiceTest {
         assertNotNull(context.getService(MetricRegistry.class));
         assertNotNull(context.getService(MetricsService.class));
 
+        assertNotNull(service.adaptTo(MetricRegistry.class));
+
         MockOsgi.deactivate(service);
 
         assertNull(context.getService(MetricRegistry.class));

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