Caffeine - Automatically register metrics cache impls if Micrometer is around

Author: gsmet

extensions/caffeine/deployment/src/main/java/io/quarkus/caffeine/deployment/CaffeineProcessor.java

@@ -7,13 +7,13 @@
 import org.jboss.jandex.ClassInfo;
 import org.jboss.jandex.DotName;
 
-import io.quarkus.caffeine.runtime.graal.CacheConstructorsFeature;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
 import io.quarkus.deployment.builditem.CombinedIndexBuildItem;
-import io.quarkus.deployment.builditem.NativeImageFeatureBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
+import io.quarkus.deployment.metrics.MetricsCapabilityBuildItem;
 import io.quarkus.deployment.pkg.steps.NativeOrNativeSourcesBuild;
+import io.quarkus.runtime.metrics.MetricsFactory;
 
 public class CaffeineProcessor {
 
@@ -26,6 +26,45 @@ public class CaffeineProcessor {
 
     private static final DotName CACHE_LOADER_NAME = DotName.createSimple(CACHE_LOADER_CLASS_NAME);
 
+    /**
+     * this list is not complete, but a selection of the types we expect being most useful.
+     * unfortunately registering all of them has been shown to have a very significant impact
+     * on executable sizes. See https://github.com/quarkusio/quarkus/issues/12961
+     */
+    private static final String[] DEFAULT_CACHE_IMPLEMENTATIONS_TO_REGISTER_FOR_REFLECTION = {
+            "com.github.benmanes.caffeine.cache.PDMS",
+            "com.github.benmanes.caffeine.cache.PSA",
+            "com.github.benmanes.caffeine.cache.PSMS",
+            "com.github.benmanes.caffeine.cache.PSW",
+            "com.github.benmanes.caffeine.cache.PSMW",
+            "com.github.benmanes.caffeine.cache.PSWMS",
+            "com.github.benmanes.caffeine.cache.PSWMW",
+            "com.github.benmanes.caffeine.cache.SILMS",
+            "com.github.benmanes.caffeine.cache.SSA",
+            "com.github.benmanes.caffeine.cache.SSLA",
+            "com.github.benmanes.caffeine.cache.SSLMS",
+            "com.github.benmanes.caffeine.cache.SSMS",
+            "com.github.benmanes.caffeine.cache.SSMSA",
+            "com.github.benmanes.caffeine.cache.SSMSW",
+            "com.github.benmanes.caffeine.cache.SSW"
+    };
+
+    /**
+     * When the Micrometer extension is around, we add the cache classes with metrics.
+     * <p>
+     * Note that we don't know if they will actually be used given the cache configuration is defined at runtime.
+     */
+    private static final String[] METRICS_CACHE_IMPLEMENTATIONS_TO_REGISTER_FOR_REFLECTION = {
+            "com.github.benmanes.caffeine.cache.SILSMS",
+            "com.github.benmanes.caffeine.cache.SSSA",
+            "com.github.benmanes.caffeine.cache.SSLSA",
+            "com.github.benmanes.caffeine.cache.SSLSMS",
+            "com.github.benmanes.caffeine.cache.SSSMS",
+            "com.github.benmanes.caffeine.cache.SSSMSA",
+            "com.github.benmanes.caffeine.cache.SSSMSW",
+            "com.github.benmanes.caffeine.cache.SSSW"
+    };
+
     @BuildStep
     void cacheLoaders(CombinedIndexBuildItem combinedIndex, BuildProducer<ReflectiveClassBuildItem> reflectiveClasses) {
         final Collection<ClassInfo> implementors = combinedIndex.getIndex().getAllKnownImplementors(CACHE_LOADER_NAME);
@@ -46,7 +85,14 @@ void cacheLoaders(CombinedIndexBuildItem combinedIndex, BuildProducer<Reflective
     }
 
     @BuildStep(onlyIf = NativeOrNativeSourcesBuild.class)
-    NativeImageFeatureBuildItem nativeImageFeature() {
-        return new NativeImageFeatureBuildItem(CacheConstructorsFeature.class);
+    void reflection(MetricsCapabilityBuildItem metricsCapability, BuildProducer<ReflectiveClassBuildItem> reflectiveClasses) {
+        reflectiveClasses
+                .produce(new ReflectiveClassBuildItem(false, false, DEFAULT_CACHE_IMPLEMENTATIONS_TO_REGISTER_FOR_REFLECTION));
+
+        if (metricsCapability.metricsSupported(MetricsFactory.MICROMETER)) {
+            reflectiveClasses
+                    .produce(new ReflectiveClassBuildItem(false, false,
+                            METRICS_CACHE_IMPLEMENTATIONS_TO_REGISTER_FOR_REFLECTION));
+        }
     }
 }

extensions/caffeine/runtime/src/main/java/io/quarkus/caffeine/runtime/graal/CacheConstructorsFeature.java

@@ -5,6 +5,8 @@ quarkus.hibernate-orm.sql-load-script=import.sql
 
 # configure the caches
 quarkus.cache.caffeine."forest".expire-after-write=10M
+
+quarkus.cache.caffeine."expensiveResourceCache".expire-after-write=10M
 quarkus.cache.caffeine."expensiveResourceCache".metrics-enabled=true
 
 io.quarkus.it.cache.SunriseRestClient/mp-rest/url=${test.url}