add

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

@@ -0,0 +1,35 @@
+/*
+ * 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.orchestration;
+
+/**
+ * Chapter including into Saga
+ */
+public interface Chapter<K> {
+
+    String getName();
+
+    ChapterResult<K> process(K value);
+    ChapterResult<K> rollback(K value);
+
+}

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

@@ -0,0 +1,22 @@
+package com.iluwatar.saga.orchestration;
+
+public class ChapterResult<K> {
+    K value;
+    State state;
+
+    public ChapterResult(K value, State state) {
+        this.value = value;
+        this.state = state;
+    }
+
+    public static <K> ChapterResult<K> success(K val) {
+        return new ChapterResult<>(val, State.SUCCESS);
+    }
+    public static <K> ChapterResult<K> failure(K val) {
+        return new ChapterResult<>(val, State.FAILURE);
+    }
+
+    public enum State {
+        SUCCESS, FAILURE
+    }
+}

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

@@ -0,0 +1,8 @@
+package com.iluwatar.saga.orchestration;
+
+public class FlyBookingService extends Service<String> {
+    @Override
+    public String getName() {
+        return "booking a Fly";
+    }
+}

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

@@ -0,0 +1,8 @@
+package com.iluwatar.saga.orchestration;
+
+public class HotelBookingService extends Service<String> {
+    @Override
+    public String getName() {
+        return "booking a Hotel";
+    }
+}

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

@@ -0,0 +1,8 @@
+package com.iluwatar.saga.orchestration;
+
+public class OrderService extends Service<String> {
+    @Override
+    public String getName() {
+        return "init an order";
+    }
+}

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

@@ -0,0 +1,80 @@
+/*
+ * 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.orchestration;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Saga {
+
+    private List<Chapter> chapters;
+    private Result result;
+
+    public Saga() {
+        this.chapters = new ArrayList<>();
+        this.result = Result.INPROCESS;
+    }
+
+    public void setResult(Result result) {
+        this.result = result;
+    }
+
+    public boolean isSuccess(){
+        return result == Result.FINISHED;
+    }
+
+    public boolean isFinished(){
+        return result != Result.INPROCESS;
+    }
+
+    public Saga chapter(String name, int timeoutInSec) {
+        this.chapters.add(new Chapter(name, timeoutInSec));
+        return this;
+    }
+
+    public Chapter get(int idx) {
+        if (chapters.size() < idx || idx < 0) {
+            throw new SagaException("idx shoud be less then ch size or more then 0");
+        }
+        return chapters.get(idx);
+    }
+
+
+
+    public static Saga create() {
+        return new Saga();
+    }
+
+    public enum Result{
+        FINISHED,CANCELED, INPROCESS;
+    }
+    private static class Chapter {
+        String name;
+        int timeoutInSec;
+
+        public Chapter(String name, int timeoutInSec) {
+            this.name = name;
+            this.timeoutInSec = timeoutInSec;
+        }
+    }
+}

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

@@ -0,0 +1,50 @@
+/*
+ * 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.orchestration;
+
+
+public class SagaApplication {
+    public static void main(String[] args) {
+
+    }
+
+
+
+    private Saga createSaga() {
+       return Saga.create()
+                .chapter("init an order",10)
+                .chapter("booking a Fly",10)
+                .chapter("booking a Hotel",10)
+                .chapter("withdrawing Money",10);
+    }
+
+    private static ServiceDiscoveryService sd() {
+        return
+                new ServiceDiscoveryService()
+                        .discover(new OrderService())
+                        .discover(new FlyBookingService())
+                        .discover(new HotelBookingService())
+                        .discover(new WithdrawMoneyService());
+    }
+}

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

@@ -0,0 +1,29 @@
+/*
+ * 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.orchestration;
+
+public class SagaException extends RuntimeException {
+    public SagaException(String message) {
+        super(message);
+    }
+}

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

@@ -0,0 +1,30 @@
+package com.iluwatar.saga.orchestration;
+
+import java.util.Objects;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class SagaOrchestrator {
+
+    private ExecutorService executor;
+    private AtomicBoolean isNormalFlow;
+    private AtomicBoolean isFinished;
+    private AtomicInteger currentState;
+    private final Saga saga;
+
+    public SagaOrchestrator(Saga saga) {
+        this.saga = saga;
+        this.isNormalFlow = new AtomicBoolean(true);
+        this.isFinished = new AtomicBoolean(false);
+        this.currentState = new AtomicInteger(0);
+        this.executor = Executors.newFixedThreadPool(20);
+    }
+
+    public <K> Saga.Result kickOff(K value) {
+
+    }
+
+
+}

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

@@ -0,0 +1,33 @@
+package com.iluwatar.saga.orchestration;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static com.iluwatar.saga.orchestration.Utility.sleepInSec;
+
+public abstract class Service<K> implements Chapter<K> {
+    private static final Logger logger = LoggerFactory.getLogger(Service.class);
+
+    @Override
+    public abstract String getName();
+
+
+    @Override
+    public ChapterResult<K> process(K value) {
+        logger.info("The chapter about {} is starting", getName());
+        logger.info("storing or calculating a data {} to db", value);
+        sleepInSec(1);
+        logger.info("the data {} has been stored or calculated successfully", value);
+        return ChapterResult.success(value);
+    }
+
+    @Override
+    public ChapterResult<K> rollback(K value) {
+        logger.info("Something is going wrong hence The chapter about {} is starting the rollback procedure", getName());
+        sleepInSec(1);
+        logger.info("the data {} has been rollbacked successfully", value);
+        return ChapterResult.success(value);
+    }
+
+
+}

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

@@ -0,0 +1,46 @@
+/*
+ * 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.orchestration;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+public class ServiceDiscoveryService {
+    private Map<String, Chapter<?>> services;
+
+    public Optional<Chapter<?>> find(String service) {
+        return Optional.ofNullable(services.getOrDefault(service, null));
+    }
+
+    public ServiceDiscoveryService discover(Chapter<?> chapterService) {
+        services.put(chapterService.getName(), chapterService);
+        return this;
+    }
+
+    public ServiceDiscoveryService() {
+        this.services = new HashMap<>();
+    }
+
+
+}

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

@@ -0,0 +1,16 @@
+package com.iluwatar.saga.orchestration;
+
+public class Utility {
+    private Utility() {
+    }
+
+    public static void sleepInSec(int sec){
+        try {
+            Thread.sleep(sec*1000);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
+
+}

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

@@ -0,0 +1,16 @@
+package com.iluwatar.saga.orchestration;
+
+public class WithdrawMoneyService extends Service<String> {
+    @Override
+    public String getName() {
+        return "withdrawing Money";
+    }
+
+    @Override
+    public ChapterResult<String> process(String value) {
+        if(value.equals("no-money")){
+            return ChapterResult.failure(value);
+        }
+        return super.process(value);
+    }
+}