add orchestrator

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

@@ -0,0 +1,13 @@
+package com.iluwatar.saga.orchestration;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class SagaApplicationTest {
+
+    @Test
+    public void mainTest() {
+        SagaApplication.main(new String[]{});
+    }
+}

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

@@ -0,0 +1,117 @@
+package com.iluwatar.saga.orchestration;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SagaOrchestratorInternallyTest {
+
+    private List<String> records = new ArrayList<>();
+
+    @Test
+    public void execute() {
+        SagaOrchestrator sagaOrchestrator = new SagaOrchestrator(newSaga(), serviceDiscovery());
+        Saga.Result result = sagaOrchestrator.execute(1);
+        Assert.assertEquals(result, Saga.Result.ROLLBACK);
+        Assert.assertArrayEquals(
+                records.toArray(new String[]{}),
+                new String[]{"+1","+2","+3","+4","-4","-3","-2","-1"});
+    }
+
+    private static Saga newSaga() {
+        return Saga
+                .create()
+                .chapter("1")
+                .chapter("2")
+                .chapter("3")
+                .chapter("4");
+    }
+
+    private ServiceDiscoveryService serviceDiscovery() {
+        return
+                new ServiceDiscoveryService()
+                        .discover(new Service1())
+                        .discover(new Service2())
+                        .discover(new Service3())
+                        .discover(new Service4());
+    }
+
+    class Service1 extends Service<Integer> {
+
+        @Override
+        public String getName() {
+            return "1";
+        }
+
+        @Override
+        public ChapterResult<Integer> process(Integer value) {
+            records.add("+1");
+            return ChapterResult.success(value);
+        }
+
+        @Override
+        public ChapterResult<Integer> rollback(Integer value) {
+            records.add("-1");
+            return ChapterResult.success(value);
+        }
+    }
+
+    class Service2 extends Service<Integer> {
+
+        @Override
+        public String getName() {
+            return "2";
+        }
+        @Override
+        public ChapterResult<Integer> process(Integer value) {
+            records.add("+2");
+            return ChapterResult.success(value);
+        }
+
+        @Override
+        public ChapterResult<Integer> rollback(Integer value) {
+            records.add("-2");
+            return ChapterResult.success(value);
+        }
+    }
+
+    class Service3 extends Service<Integer> {
+
+        @Override
+        public String getName() {
+            return "3";
+        }
+        @Override
+        public ChapterResult<Integer> process(Integer value) {
+            records.add("+3");
+            return ChapterResult.success(value);
+        }
+
+        @Override
+        public ChapterResult<Integer> rollback(Integer value) {
+            records.add("-3");
+            return ChapterResult.success(value);
+        }
+    }
+
+    class Service4 extends Service<Integer> {
+
+        @Override
+        public String getName() {
+            return "4";
+        }
+        @Override
+        public ChapterResult<Integer> process(Integer value) {
+            records.add("+4");
+            return ChapterResult.failure(value);
+        }
+
+        @Override
+        public ChapterResult<Integer> rollback(Integer value) {
+            records.add("-4");
+            return ChapterResult.success(value);
+        }
+    }
+}

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

@@ -0,0 +1,37 @@
+package com.iluwatar.saga.orchestration;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class SagaOrchestratorTest {
+
+    @Test
+    public void execute() {
+        SagaOrchestrator sagaOrchestrator = new SagaOrchestrator(newSaga(), serviceDiscovery());
+        Saga.Result badOrder = sagaOrchestrator.execute("bad_order");
+        Saga.Result crashedOrder = sagaOrchestrator.execute("crashed_order");
+
+        Assert.assertEquals(badOrder, Saga.Result.ROLLBACK);
+        Assert.assertEquals(crashedOrder, Saga.Result.CRASHED);
+    }
+
+    private static Saga newSaga() {
+        return Saga
+                .create()
+                .chapter("init an order")
+                .chapter("booking a Fly")
+                .chapter("booking a Hotel")
+                .chapter("withdrawing Money");
+    }
+
+    private static ServiceDiscoveryService serviceDiscovery() {
+        return
+                new ServiceDiscoveryService()
+                        .discover(new OrderService())
+                        .discover(new FlyBookingService())
+                        .discover(new HotelBookingService())
+                        .discover(new WithdrawMoneyService());
+    }
+}