add ch

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

@@ -20,7 +20,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-package com.iluwatar.saga.orchestration;
+package com.iluwatar.saga;
+
+import com.iluwatar.saga.orchestration.Chapter;
 
 import java.util.HashMap;
 import java.util.Map;

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

@@ -0,0 +1,59 @@
+/*
+ * The MIT License
+ * Copyright © 2014-2019 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+package com.iluwatar.saga.choreography;
+
+import com.iluwatar.saga.orchestration.ChapterResult;
+
+/**
+ * Chapter is an interface representing a contract for an external service.
+ * @param <K> is type for passing params
+ */
+public interface Chapter<K> {
+
+    /**
+     * @return service name.
+     */
+    String getName();
+
+    /**
+     * every chapter is responsible for a part of saga.
+     * @param value incoming value
+     * @return saga result @see {@link RichSaga}
+     */
+    RichSaga<K> execute(K value);
+
+    /**
+     * The operation executed in general case.
+     * @param value incoming value
+     * @return result {@link ChapterResult}
+     */
+    ChapterResult<K> process(K value);
+
+    /**
+     * The operation executed in rollback case.
+     * @param value incoming value
+     * @return result {@link ChapterResult}
+     */
+    ChapterResult<K> rollback(K value);
+
+}

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

@@ -0,0 +1,33 @@
+package com.iluwatar.saga.choreography;
+
+import com.iluwatar.saga.ServiceDiscoveryService;
+import com.iluwatar.saga.orchestration.Chapter;
+import com.iluwatar.saga.orchestration.ChapterResult;
+import com.iluwatar.saga.orchestration.OrchestrationService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class ChoreographyService<K>  implements Chapter<K> {
+
+    protected static final Logger logger = LoggerFactory.getLogger(OrchestrationService.class);
+
+    private final ServiceDiscoveryService service;
+    protected ChoreographyService(ServiceDiscoveryService service) {
+        this.service = service;
+    }
+
+    @Override
+    public ChapterResult<K> process(K value) {
+        logger.info("The chapter '{}' has been started. The data {} has been stored or calculated successfully",
+                getName(),value);
+        return ChapterResult.success(value);
+    }
+
+    @Override
+    public ChapterResult<K> rollback(K value) {
+        logger.info("The Rollback for a chapter '{}' has been started. The data {} has been rollbacked successfully",
+                getName(),value);
+        return ChapterResult.success(value);
+    }
+
+}

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

@@ -0,0 +1,4 @@
+package com.iluwatar.saga.choreography;
+
+public class RichSaga<K> {
+}

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

@@ -25,7 +25,7 @@ package com.iluwatar.saga.orchestration;
 /**
  * Class representing a service to book a fly
  */
-public class FlyBookingService extends Service<String> {
+public class FlyBookingService extends OrchestrationService<String> {
     @Override
     public String getName() {
         return "booking a Fly";

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

@@ -25,7 +25,7 @@ package com.iluwatar.saga.orchestration;
 /**
  * Class representing a service to book a hotel
  */
-public class HotelBookingService extends Service<String> {
+public class HotelBookingService extends OrchestrationService<String> {
     @Override
     public String getName() {
         return "booking a Hotel";

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

@@ -30,8 +30,8 @@ import org.slf4j.LoggerFactory;
  * implementing a general contract @see {@link Chapter}
  * @param <K> type of incoming param
  */
-public abstract class Service<K> implements Chapter<K> {
-    protected static final Logger logger = LoggerFactory.getLogger(Service.class);
+public abstract class OrchestrationService<K> implements Chapter<K> {
+    protected static final Logger logger = LoggerFactory.getLogger(OrchestrationService.class);
 
     @Override
     public abstract String getName();

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

@@ -25,7 +25,7 @@ package com.iluwatar.saga.orchestration;
 /**
  * Class representing a service to init a new order.
  */
-public class OrderService extends Service<String> {
+public class OrderService extends OrchestrationService<String> {
     @Override
     public String getName() {
         return "init an order";

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

@@ -70,5 +70,8 @@ public class Saga {
             this.name = name;
         }
 
+        public String getName() {
+            return name;
+        }
     }
 }

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

@@ -24,6 +24,7 @@
 package com.iluwatar.saga.orchestration;
 
 
+import com.iluwatar.saga.ServiceDiscoveryService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -40,7 +41,7 @@ import org.slf4j.LoggerFactory;
  *
  * @see Saga
  * @see SagaOrchestrator
- * @see Service
+ * @see OrchestrationService
  */
 public class SagaApplication {
     private static final Logger logger = LoggerFactory.getLogger(SagaApplication.class);

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

@@ -22,6 +22,7 @@
  */
 package com.iluwatar.saga.orchestration;
 
+import com.iluwatar.saga.ServiceDiscoveryService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 

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

@@ -25,7 +25,7 @@ package com.iluwatar.saga.orchestration;
 /**
  * Class representing a service to withdraw a money
  */
-public class WithdrawMoneyService extends Service<String> {
+public class WithdrawMoneyService extends OrchestrationService<String> {
     @Override
     public String getName() {
         return "withdrawing Money";

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

@@ -1,5 +1,6 @@
 package com.iluwatar.saga.orchestration;
 
+import com.iluwatar.saga.ServiceDiscoveryService;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -38,7 +39,7 @@ public class SagaOrchestratorInternallyTest {
                         .discover(new Service4());
     }
 
-    class Service1 extends Service<Integer> {
+    class Service1 extends OrchestrationService<Integer> {
 
         @Override
         public String getName() {
@@ -58,7 +59,7 @@ public class SagaOrchestratorInternallyTest {
         }
     }
 
-    class Service2 extends Service<Integer> {
+    class Service2 extends OrchestrationService<Integer> {
 
         @Override
         public String getName() {
@@ -77,7 +78,7 @@ public class SagaOrchestratorInternallyTest {
         }
     }
 
-    class Service3 extends Service<Integer> {
+    class Service3 extends OrchestrationService<Integer> {
 
         @Override
         public String getName() {
@@ -96,7 +97,7 @@ public class SagaOrchestratorInternallyTest {
         }
     }
 
-    class Service4 extends Service<Integer> {
+    class Service4 extends OrchestrationService<Integer> {
 
         @Override
         public String getName() {

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

@@ -1,10 +1,9 @@
 package com.iluwatar.saga.orchestration;
 
+import com.iluwatar.saga.ServiceDiscoveryService;
 import org.junit.Assert;
 import org.junit.Test;
 
-import static org.junit.Assert.*;
-
 public class SagaOrchestratorTest {
 
     @Test