refactor: add init param config (#53)

Author: aaron-steinfeld

platform-http-service-framework/src/main/java/org/hypertrace/core/serviceframework/http/HttpHandlerDefinition.java

@@ -2,9 +2,11 @@
 
 import com.google.inject.Injector;
 import java.util.List;
+import java.util.Map;
 import javax.servlet.MultipartConfigElement;
 import javax.servlet.Servlet;
 import lombok.Builder;
+import lombok.Singular;
 import lombok.Value;
 import lombok.experimental.Accessors;
 
@@ -19,6 +21,7 @@ public class HttpHandlerDefinition {
   CorsConfig corsConfig;
   Injector injector;
   MultipartConfigElement multipartConfig;
+  @Singular Map<String, String> servletInitParameters;
 
   @Accessors(fluent = true)
   boolean useSessions;

platform-http-service-framework/src/main/java/org/hypertrace/core/serviceframework/http/jetty/JettyHttpServerBuilder.java

@@ -10,6 +10,7 @@
 import java.util.EnumSet;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -130,6 +131,9 @@ private Optional<ServletHolder> buildServletHolderIfRequired(
       return Optional.empty();
     }
     ServletHolder servletHolder = new ServletHolder(handlerDefinition.getServlet());
+    Optional.of(handlerDefinition.getServletInitParameters())
+        .orElse(Map.of())
+        .forEach(servletHolder::setInitParameter);
     Optional.ofNullable(handlerDefinition.getMultipartConfig())
         .ifPresent(servletHolder.getRegistration()::setMultipartConfig);
     return Optional.of(servletHolder);