Added Restaurant Sample Stream Apps for multiple binders in parallel.

restaurant-stream-apps/scdf-app-customer/src/main/java/io/spring/scdf/customer/Customer.java

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+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.spring.scdf.customer;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.springframework.cloud.stream.annotation.EnableBinding;
+import org.springframework.cloud.stream.annotation.Input;
+import org.springframework.cloud.stream.annotation.Output;
+import org.springframework.cloud.stream.annotation.StreamListener;
+import org.springframework.messaging.MessageChannel;
+import org.springframework.messaging.SubscribableChannel;
+import org.springframework.messaging.support.MessageBuilder;
+import org.springframework.stereotype.Component;
+
+/**
+ * @author Corneil du Plessis
+ */
+@Component
+@EnableBinding(Customer.Events.class)
+public class Customer {
+    private static final Logger logger = LoggerFactory.getLogger(Customer.class);
+    private Random random = new Random(System.currentTimeMillis());
+    private List<String> cold = Arrays.asList("water", "coke", "sprite");
+    private List<String> hot = Arrays.asList("coffee", "tea");
+    private List<String> food = Arrays.asList("burger", "pizza", "steak", "pasta");
+    private final Events events;
+    private boolean placedOrder = false;
+
+    public Customer(Events events) {
+        this.events = events;
+    }
+
+    public void placeOrders() {
+        if (!placedOrder) {
+            logger.info("placeOrder:start");
+            placeOrder(cold);
+            placeOrder(food);
+            placeOrder(hot);
+            placedOrder = true;
+            logger.info("placeOrder:end");
+        } else {
+            logger.info("placeOrder:done");
+        }
+    }
+
+    public void placeOrder(List<String> items) {
+        String item = items.get(random.nextInt(items.size()));
+        logger.info("placeOrder:send:order:{}", item);
+        events.order().send(MessageBuilder.withPayload(item).build());
+    }
+
+
+    @StreamListener(Events.RECEIVE)
+    public void receive(String order) {
+        String message = "money for " + order;
+        logger.info("receive:{}:send:payment:{}", order, message);
+
+        events.payment().send(MessageBuilder.withPayload(message).build());
+    }
+
+    @StreamListener(Events.OPEN)
+    public void isOpen(String message) {
+        logger.info("isOpen:{}", message);
+        placeOrders();
+    }
+
+    public interface Events {
+        String OPEN = "open";
+        String ORDER = "order";
+        String RECEIVE = "receive";
+        String PAYMENT = "payment";
+
+        @Output(ORDER)
+        MessageChannel order();
+
+        @Output(PAYMENT)
+        MessageChannel payment();
+
+        @Input(RECEIVE)
+        SubscribableChannel receive();
+
+        @Input(OPEN)
+        SubscribableChannel open();
+    }
+}

restaurant-stream-apps/scdf-app-customer/src/main/java/io/spring/scdf/customer/ScdfAppCustomerApplication.java

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+/*
+ * Copyright 2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.spring.scdf.customer;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@SpringBootApplication
+@EnableScheduling
+public class ScdfAppCustomerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(ScdfAppCustomerApplication.class, args);
+    }
+
+}

restaurant-stream-apps/scdf-app-customer/src/main/resources/application.properties

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+spring.application.name=customer
+logging.level.root=info

restaurant-stream-apps/scdf-app-customer/src/test/java/io/spring/scdf/customer/ScdfAppCustomerApplicationTests.java

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+package io.spring.scdf.customer;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+
+@SpringBootTest
+@ActiveProfiles(profiles = "test")
+class ScdfAppCustomerApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}