added reporting config installer (#383)

Author: shashank11p

javaagent-core/src/main/java/org/hypertrace/agent/core/config/ReportingConfig.java

@@ -33,8 +33,8 @@ final class ConfigProvider {
 
     private static volatile ReportingConfig reportingConfig;
 
-    private static ReportingConfig load() {
-      ServiceLoader<ReportingConfig> configs = ServiceLoader.load(ReportingConfig.class);
+    private static ReportingConfig load(ClassLoader cl) {
+      ServiceLoader<ReportingConfig> configs = ServiceLoader.load(ReportingConfig.class, cl);
       Iterator<ReportingConfig> iterator = configs.iterator();
       if (!iterator.hasNext()) {
         logger.error("Failed to load reporting config");
@@ -43,11 +43,22 @@ private static ReportingConfig load() {
       return iterator.next();
     }
 
+    public static ReportingConfig get(ClassLoader cl) {
+      if (reportingConfig == null) {
+        synchronized (ConfigProvider.class) {
+          if (reportingConfig == null) {
+            reportingConfig = load(cl);
+          }
+        }
+      }
+      return reportingConfig;
+    }
+
     public static ReportingConfig get() {
       if (reportingConfig == null) {
         synchronized (ConfigProvider.class) {
           if (reportingConfig == null) {
-            reportingConfig = load();
+            reportingConfig = load(Thread.currentThread().getContextClassLoader());
           }
         }
       }

otel-extensions/src/main/java/org/hypertrace/agent/otel/extensions/config/ReportingConfigInstaller.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright The Hypertrace Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.hypertrace.agent.otel.extensions.config;
+
+import com.google.auto.service.AutoService;
+import io.opentelemetry.javaagent.tooling.BeforeAgentListener;
+import io.opentelemetry.sdk.autoconfigure.AutoConfiguredOpenTelemetrySdk;
+import org.hypertrace.agent.core.config.ReportingConfig.ConfigProvider;
+
+@AutoService(BeforeAgentListener.class)
+public class ReportingConfigInstaller implements BeforeAgentListener {
+
+  @Override
+  public void beforeAgent(AutoConfiguredOpenTelemetrySdk autoConfiguredOpenTelemetrySdk) {
+    ConfigProvider.get(getClass().getClassLoader());
+  }
+}