Refactored configuration to ease use

Author: oliemansm

src/main/java/graphql/servlet/GraphQLConfiguration.java

@@ -9,8 +9,8 @@
 public class GraphQLConfiguration {
 
     private GraphQLInvocationInputFactory invocationInputFactory;
-    private GraphQLQueryInvoker queryInvoker = GraphQLQueryInvoker.newBuilder().build();
-    private GraphQLObjectMapper objectMapper = GraphQLObjectMapper.newBuilder().build();
+    private GraphQLQueryInvoker queryInvoker;
+    private GraphQLObjectMapper objectMapper;
     private List<GraphQLServletListener> listeners;
     private boolean asyncServletModeEnabled;
 
@@ -22,7 +22,7 @@ public static GraphQLConfiguration.Builder with(GraphQLSchemaProvider schemaProv
         return new Builder(GraphQLInvocationInputFactory.newBuilder(schemaProvider));
     }
 
-    static GraphQLConfiguration.Builder with(GraphQLInvocationInputFactory invocationInputFactory) {
+    public static GraphQLConfiguration.Builder with(GraphQLInvocationInputFactory invocationInputFactory) {
         return new Builder(invocationInputFactory);
     }
 

src/main/java/graphql/servlet/GraphQLInvocationInputFactory.java

@@ -14,6 +14,7 @@
  * @author Andrew Potter
  */
 public class GraphQLInvocationInputFactory {
+
     private final Supplier<GraphQLSchemaProvider> schemaProviderSupplier;
     private final Supplier<GraphQLContextBuilder> contextBuilderSupplier;
     private final Supplier<GraphQLRootObjectBuilder> rootObjectBuilderSupplier;

src/main/java/graphql/servlet/GraphQLQueryInvoker.java

@@ -123,6 +123,18 @@ public Builder withInstrumentation(Supplier<Instrumentation> supplier) {
             return this;
         }
 
+        public Builder with(List<Instrumentation> instrumentations) {
+            if (instrumentations.isEmpty()) {
+                return this;
+            }
+            if (instrumentations.size() == 1) {
+                withInstrumentation(instrumentations.get(0));
+            } else {
+                withInstrumentation(new ChainedInstrumentation(instrumentations));
+            }
+            return this;
+        }
+
         public Builder withPreparsedDocumentProvider(PreparsedDocumentProvider provider) {
             return withPreparsedDocumentProvider(() -> provider);
         }

src/main/java/graphql/servlet/SimpleGraphQLHttpServlet.java

@@ -17,12 +17,7 @@ public SimpleGraphQLHttpServlet() {
     }
 
     /**
-     * @param invocationInputFactory
-     * @param queryInvoker
-     * @param graphQLObjectMapper
-     * @param listeners
-     * @param asyncServletMode
-     * @deprecated
+     * @deprecated use {@link GraphQLHttpServlet} instead
      */
     @Deprecated
     public SimpleGraphQLHttpServlet(GraphQLInvocationInputFactory invocationInputFactory, GraphQLQueryInvoker queryInvoker, GraphQLObjectMapper graphQLObjectMapper, List<GraphQLServletListener> listeners, boolean asyncServletMode) {