Code cleanup (#1461)

* Code cleanup

* Fix flux tests

* Fix checkstyle errors

* Fix compile error

saga/src/main/java/com/iluwatar/saga/choreography/Saga.java

@@ -33,7 +33,7 @@ import java.util.List;
  */
 public class Saga {
 
-  private List<Chapter> chapters;
+  private final List<Chapter> chapters;
   private int pos;
   private boolean forward;
   private boolean finished;
@@ -153,7 +153,7 @@ public class Saga {
    * outcoming parameter).
    */
   public static class Chapter {
-    private String name;
+    private final String name;
     private ChapterResult result;
     private Object inValue;
 

saga/src/main/java/com/iluwatar/saga/choreography/ServiceDiscoveryService.java

@@ -32,7 +32,7 @@ import java.util.Optional;
  * The class representing a service discovery pattern.
  */
 public class ServiceDiscoveryService {
-  private Map<String, ChoreographyChapter> services;
+  private final Map<String, ChoreographyChapter> services;
 
   /**
    * find any service.

saga/src/main/java/com/iluwatar/saga/orchestration/ChapterResult.java

@@ -29,8 +29,8 @@ package com.iluwatar.saga.orchestration;
  * @param <K> incoming value
  */
 public class ChapterResult<K> {
-  private K value;
-  private State state;
+  private final K value;
+  private final State state;
 
   public K getValue() {
     return value;

saga/src/main/java/com/iluwatar/saga/orchestration/Saga.java

@@ -32,7 +32,7 @@ import java.util.List;
  */
 public class Saga {
 
-  private List<Chapter> chapters;
+  private final List<Chapter> chapters;
 
 
   private Saga() {

saga/src/main/java/com/iluwatar/saga/orchestration/ServiceDiscoveryService.java

@@ -31,7 +31,7 @@ import java.util.Optional;
  * The class representing a service discovery pattern.
  */
 public class ServiceDiscoveryService {
-  private Map<String, OrchestrationChapter<?>> services;
+  private final Map<String, OrchestrationChapter<?>> services;
 
   public Optional<OrchestrationChapter> find(String service) {
     return Optional.ofNullable(services.getOrDefault(service, null));

saga/src/test/java/com/iluwatar/saga/orchestration/SagaOrchestratorInternallyTest.java

@@ -34,7 +34,7 @@ import org.junit.Test;
  */
 public class SagaOrchestratorInternallyTest {
 
-  private List<String> records = new ArrayList<>();
+  private final List<String> records = new ArrayList<>();
 
   @Test
   public void executeTest() {