Use a bean for telemetry wrapping to avoid making DataSources mutable

We had a hard time making it immutable so let's not break this contract.
We had a lot of race conditions before doing so.

docs/src/main/asciidoc/opentelemetry.adoc

@@ -243,7 +243,7 @@ The https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/ma
 implementation("io.opentelemetry.instrumentation:opentelemetry-jdbc")
 ----
 
-As it uses a dedicated JDBC datasource wrapper, you must enable JDBC tracing for your datasource:
+As it uses a dedicated JDBC datasource wrapper, you must enable telemetry for your datasource:
 
 [source, properties]
 ----

extensions/agroal/deployment/src/main/java/io/quarkus/agroal/deployment/AgroalProcessor.java

@@ -22,7 +22,6 @@
 import io.agroal.api.AgroalDataSource;
 import io.agroal.api.AgroalPoolInterceptor;
 import io.quarkus.agroal.DataSource;
-import io.quarkus.agroal.runtime.AgroalOpenTelemetryRecorder;
 import io.quarkus.agroal.runtime.AgroalRecorder;
 import io.quarkus.agroal.runtime.DataSourceJdbcBuildTimeConfig;
 import io.quarkus.agroal.runtime.DataSourceSupport;
@@ -83,7 +82,7 @@ void build(
             Capabilities capabilities,
             BuildProducer<ExtensionSslNativeSupportBuildItem> sslNativeSupport,
             BuildProducer<AggregatedDataSourceBuildTimeConfigBuildItem> aggregatedConfig,
-            BuildProducer<OpenTelemetryJDBCInstrumentationBuildItem> otelInstrumentationActiveProducer,
+            BuildProducer<AdditionalBeanBuildItem> additionalBeans,
             CurateOutcomeBuildItem curateOutcomeBuildItem) throws Exception {
         if (dataSourcesBuildTimeConfig.driver.isPresent() || dataSourcesBuildTimeConfig.url.isPresent()) {
             throw new ConfigurationException(
@@ -111,7 +110,7 @@ void build(
                                 DataSources.TRACING_DRIVER_CLASSNAME));
             }
 
-            if (aggregatedDataSourceBuildTimeConfig.getJdbcConfig().telemetry && !otelJdbcInstrumentationActive) {
+            if (aggregatedDataSourceBuildTimeConfig.getJdbcConfig().telemetry) {
                 otelJdbcInstrumentationActive = true;
             }
 
@@ -124,8 +123,10 @@ void build(
 
         if (otelJdbcInstrumentationActive && capabilities.isPresent(OPENTELEMETRY_TRACER)) {
             // at least one datasource is using OpenTelemetry JDBC instrumentation,
-            // therefore we need to prepare OpenTelemetry data source wrapper
-            otelInstrumentationActiveProducer.produce(new OpenTelemetryJDBCInstrumentationBuildItem());
+            // therefore we register the OpenTelemetry data source wrapper bean
+            additionalBeans.produce(new AdditionalBeanBuildItem.Builder()
+                    .addBeanClass("io.quarkus.agroal.runtime.AgroalOpenTelemetryWrapper")
+                    .setDefaultScope(DotNames.SINGLETON).build());
         }
 
         // For now, we can't push the security providers to Agroal so we need to include
@@ -216,8 +217,6 @@ void generateDataSourceSupportBean(AgroalRecorder recorder,
             List<AggregatedDataSourceBuildTimeConfigBuildItem> aggregatedBuildTimeConfigBuildItems,
             SslNativeConfigBuildItem sslNativeConfig,
             Capabilities capabilities,
-            Optional<OpenTelemetryJDBCInstrumentationBuildItem> otelInstrumentationActive,
-            AgroalOpenTelemetryRecorder agroalOpenTelemetryRecorder,
             BuildProducer<AdditionalBeanBuildItem> additionalBeans,
             BuildProducer<SyntheticBeanBuildItem> syntheticBeanBuildItemBuildProducer,
             BuildProducer<UnremovableBeanBuildItem> unremovableBeans) {
@@ -228,13 +227,6 @@ void generateDataSourceSupportBean(AgroalRecorder recorder,
             return;
         }
 
-        if (otelInstrumentationActive.isPresent()) {
-            // prepare OpenTelemetry datasource wrapper
-            // this code must only run when the OpenTelemetry is active
-            // to avoid native failures
-            agroalOpenTelemetryRecorder.prepareOpenTelemetryAgroalDatasource();
-        }
-
         // make a DataSourceProducer bean
         additionalBeans.produce(AdditionalBeanBuildItem.builder().addBeanClasses(DataSources.class).setUnremovable()
                 .setDefaultScope(DotNames.SINGLETON).build());

extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/AgroalOpenTelemetryWrapper.java

@@ -0,0 +1,13 @@
+package io.quarkus.agroal.runtime;
+
+import java.util.function.Function;
+
+import io.agroal.api.AgroalDataSource;
+
+public class AgroalOpenTelemetryWrapper implements Function<AgroalDataSource, AgroalDataSource> {
+
+    @Override
+    public AgroalDataSource apply(AgroalDataSource originalDataSource) {
+        return new OpenTelemetryAgroalDataSource(originalDataSource);
+    }
+}

extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/DataSources.java

@@ -7,7 +7,6 @@
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.Map;
-import java.util.Objects;
 import java.util.ServiceLoader;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
@@ -69,7 +68,6 @@ public class DataSources {
     public static final String TRACING_DRIVER_CLASSNAME = "io.opentracing.contrib.jdbc.TracingDriver";
     private static final String JDBC_URL_PREFIX = "jdbc:";
     private static final String JDBC_TRACING_URL_PREFIX = "jdbc:tracing:";
-    private static volatile Function<AgroalDataSource, AgroalDataSource> OTEL_DATASOURCE_TRANSFORMER = null;
 
     private final DataSourcesBuildTimeConfig dataSourcesBuildTimeConfig;
     private final DataSourcesRuntimeConfig dataSourcesRuntimeConfig;
@@ -81,6 +79,7 @@ public class DataSources {
     private final TransactionSynchronizationRegistry transactionSynchronizationRegistry;
     private final DataSourceSupport dataSourceSupport;
     private final Instance<AgroalPoolInterceptor> agroalPoolInterceptors;
+    private final Instance<AgroalOpenTelemetryWrapper> agroalOpenTelemetryWrapper;
 
     private final ConcurrentMap<String, AgroalDataSource> dataSources = new ConcurrentHashMap<>();
 
@@ -90,8 +89,10 @@ public DataSources(DataSourcesBuildTimeConfig dataSourcesBuildTimeConfig,
             TransactionManagerConfiguration transactionRuntimeConfig,
             TransactionManager transactionManager,
             XAResourceRecoveryRegistry xaResourceRecoveryRegistry,
-            TransactionSynchronizationRegistry transactionSynchronizationRegistry, DataSourceSupport dataSourceSupport,
-            @Any Instance<AgroalPoolInterceptor> agroalPoolInterceptors) {
+            TransactionSynchronizationRegistry transactionSynchronizationRegistry,
+            DataSourceSupport dataSourceSupport,
+            @Any Instance<AgroalPoolInterceptor> agroalPoolInterceptors,
+            Instance<AgroalOpenTelemetryWrapper> agroalOpenTelemetryWrapper) {
         this.dataSourcesBuildTimeConfig = dataSourcesBuildTimeConfig;
         this.dataSourcesRuntimeConfig = dataSourcesRuntimeConfig;
         this.dataSourcesJdbcBuildTimeConfig = dataSourcesJdbcBuildTimeConfig;
@@ -102,6 +103,7 @@ public DataSources(DataSourcesBuildTimeConfig dataSourcesBuildTimeConfig,
         this.transactionSynchronizationRegistry = transactionSynchronizationRegistry;
         this.dataSourceSupport = dataSourceSupport;
         this.agroalPoolInterceptors = agroalPoolInterceptors;
+        this.agroalOpenTelemetryWrapper = agroalOpenTelemetryWrapper;
     }
 
     /**
@@ -129,6 +131,7 @@ public AgroalDataSource apply(String s) {
         });
     }
 
+    @SuppressWarnings("resource")
     public AgroalDataSource doCreateDataSource(String dataSourceName) {
         if (!dataSourceSupport.entries.containsKey(dataSourceName)) {
             throw new IllegalArgumentException("No datasource named '" + dataSourceName + "' exists");
@@ -255,9 +258,9 @@ public AgroalDataSource doCreateDataSource(String dataSourceName) {
         }
 
         if (dataSourceJdbcBuildTimeConfig.telemetry && dataSourceJdbcRuntimeConfig.telemetry.orElse(true)) {
-            // active OpenTelemetry JDBC instrumentation by wrapping AgroalDatasource
-            // use the transformer as we can't reference optional OpenTelemetry classes here
-            dataSource = OTEL_DATASOURCE_TRANSFORMER.apply(dataSource);
+            // activate OpenTelemetry JDBC instrumentation by wrapping AgroalDatasource
+            // use an optional CDI bean as we can't reference optional OpenTelemetry classes here
+            dataSource = agroalOpenTelemetryWrapper.get().apply(dataSource);
         }
 
         return dataSource;
@@ -452,13 +455,4 @@ public void stop() {
             }
         }
     }
-
-    /**
-     * Set a function that will wrap {@link AgroalDataSource} with the OpenTelemetry datasource.
-     */
-    static void setOpenTelemetryDatasourceTransformer(Function<AgroalDataSource, AgroalDataSource> otelDatasourceTransformer) {
-        Objects.requireNonNull(otelDatasourceTransformer);
-        OTEL_DATASOURCE_TRANSFORMER = otelDatasourceTransformer;
-    }
-
 }

extensions/agroal/runtime/src/main/java/io/quarkus/agroal/runtime/OpenTelemetryAgroalDataSource.java

@@ -13,7 +13,7 @@
 import io.opentelemetry.instrumentation.jdbc.datasource.OpenTelemetryDataSource;
 
 /**
- * The {@link AgroalDataSource} wrapper that actives OpenTelemetry JDBC instrumentation.
+ * The {@link AgroalDataSource} wrapper that activates OpenTelemetry JDBC instrumentation.
  */
 public class OpenTelemetryAgroalDataSource extends OpenTelemetryDataSource implements AgroalDataSource {