Adds an update interval to the property and tag metrics

src/main/java/org/phoebus/channelfinder/MetricsService.java

@@ -7,6 +7,7 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.annotation.PropertySource;
+import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
@@ -16,6 +17,8 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
 import java.util.stream.Collectors;
 import java.util.Map.Entry;
 
@@ -41,6 +44,9 @@ public class MetricsService {
     private final TagRepository tagRepository;
     private final MeterRegistry meterRegistry;
 
+    private Map<MultiValueMap<String, String>, AtomicLong> propertyMetrics;
+    private Map<String, AtomicLong> tagMetrics;
+
     @Value("${metrics.tags}")
     private String[] tags;
 
@@ -87,10 +93,14 @@ private void registerGaugeMetrics() {
         registerPropertyMetrics();
     }
 
+
     private void registerTagMetrics() {
         // Add tags
+        tagMetrics = Arrays.stream(tags)
+            .map(t -> Map.entry(t, new AtomicLong(0)))
+            .collect(Collectors.toMap(Entry::getKey, Entry::getValue));
         for (String tag : tags) {
-            Gauge.builder(CF_TAG_ON_CHANNELS_COUNT, () -> channelRepository.countByTag(tag))
+            Gauge.builder(CF_TAG_ON_CHANNELS_COUNT, tagMetrics, m -> m.get(tag).doubleValue())
                 .description("Number of channels with tag")
                 .tag("tag", tag)
                 .baseUnit(BASE_UNIT)
@@ -154,14 +164,39 @@ private List<Tag> metricTagsFromMultiValueMap(MultiValueMap<String, String> mult
         }
         return metricTags;
     }
+
     private void registerPropertyMetrics() {
         Map<String, List<String>> properties = parseProperties();
 
         List<MultiValueMap<String, String>> combinations = generateAllMultiValueMaps(properties);
-        combinations.forEach(map -> Gauge.builder(CF_CHANNEL_COUNT, () -> channelRepository.count(map))
+
+        propertyMetrics = combinations.stream()
+            .map(t -> Map.entry(t, new AtomicLong(0)))
+            .collect(Collectors.toMap(Entry::getKey, Entry::getValue));
+        combinations.forEach(map -> Gauge.builder(CF_CHANNEL_COUNT, propertyMetrics, m -> m.get(map).doubleValue())
             .description(METRIC_DESCRIPTION_CHANNEL_COUNT)
             .tags(metricTagsFromMultiValueMap(map))
             .register(meterRegistry)
         );
     }
+
+    private void updateTagMetrics() {
+        for (Map.Entry<String, AtomicLong> tagMetricEntry : tagMetrics.entrySet()) {
+            tagMetricEntry.getValue()
+                .set(channelRepository.countByTag(tagMetricEntry.getKey()));
+        }
+    }
+
+    private void updatePropertyMetrics() {
+        for (Map.Entry<MultiValueMap<String, String>, AtomicLong> propertyMetricEntry : propertyMetrics.entrySet()) {
+            propertyMetricEntry.getValue()
+                .set(channelRepository.count(propertyMetricEntry.getKey()));
+        }
+    }
+
+    @Scheduled(fixedRateString = "${metrics.updateInterval}", timeUnit = TimeUnit.SECONDS)
+    public void updateMetrics() {
+        updateTagMetrics();
+        updatePropertyMetrics();
+    }
 }

src/main/resources/application.properties

@@ -142,3 +142,4 @@ aa.auto_pause=
 management.endpoints.web.exposure.include=prometheus, metrics, health, info
 metrics.tags=
 metrics.properties=pvStatus:Active, Inactive
+metrics.updateInterval=60

src/test/java/org/phoebus/channelfinder/MetricsServiceIT.java

@@ -12,7 +12,6 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.security.core.parameters.P;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.TestPropertySource;
 import org.springframework.test.web.servlet.MockMvc;
@@ -35,7 +34,8 @@
     locations = "classpath:application_test.properties",
     properties = {
         "metrics.tags=testTag0, testTag1",
-        "metrics.properties=testProperty0: value0, value1; testProperty1: value0, !*"
+        "metrics.properties=testProperty0: value0, value1; testProperty1: value0, !*",
+        "metrics.updateInterval=1"
     })
 class MetricsServiceIT {
 
@@ -142,6 +142,7 @@ void testTagMultiGaugeMetrics() throws Exception {
         Channel testChannel1 = new Channel("testChannelTag1", "testOwner", List.of(), List.of(testTags.get(0)));
         channelRepository.save(testChannel1);
 
+        Thread.sleep(2000); // Update interval is 1 second
         getAndExpectTagMetric(testTags.get(0), 2);
         getAndExpectTagMetric(testTags.get(1), 1);
         getAndExpectMetricParent(MetricsService.CF_TAG_ON_CHANNELS_COUNT, 3);
@@ -189,6 +190,8 @@ void testPropertyMultiGaugeMetrics() throws Exception {
         channelRepository.save(testChannel);
         channelRepository.save(testChannel1);
 
+        Thread.sleep(2000); // Update interval is 1 second
+
         getAndExpectMetricParent(MetricsService.CF_CHANNEL_COUNT, 2);
         getAndExpectPropertyMetric(testChannel.getProperties().get(0), 1);
         getAndExpectPropertyMetric(testChannel1.getProperties().get(0), 1);

src/test/resources/application_test.properties

@@ -107,4 +107,5 @@ aa.auto_pause=pvStatus,archive
 #actuator
 management.endpoints.web.exposure.include=prometheus, metrics, health, info
 metrics.tags=group4_10
-metrics.properties=group4: 10; group5: 10
+metrics.properties=group4: 10; group5: 10
+metrics.updateInterval=1