Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

spring-integration/src/main/java/com/baeldung/subflows/discardflow/FilterExample.java

@@ -0,0 +1,57 @@
+package com.baeldung.subflows.discardflow;
+
+import java.util.Collection;
+import org.springframework.context.annotation.Bean;
+import org.springframework.integration.annotation.Gateway;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.dsl.IntegrationFlow;
+
+@EnableIntegration
+@IntegrationComponentScan
+public class FilterExample {
+    @MessagingGateway
+    public interface NumbersClassifier {
+        @Gateway(requestChannel = "classify.input")
+        void classify(Collection<Integer> numbers);
+    }
+
+    @Bean
+    QueueChannel multipleofThreeChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsOneChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsTwoChannel() {
+        return new QueueChannel();
+    }
+    boolean isMultipleOfThree(Integer number) {
+        return number % 3 == 0;
+    }
+
+    boolean isRemainderOne(Integer number) {
+        return number % 3 == 1;
+    }
+
+    boolean isRemainderTwo(Integer number) {
+        return number % 3 == 2;
+    }
+    @Bean
+    public IntegrationFlow classify() {
+        return flow -> flow.split()
+            .<Integer> filter(this::isMultipleOfThree, notMultiple  -> notMultiple 
+                .discardFlow(oneflow  -> oneflow 
+                    .<Integer> filter(this::isRemainderOne, 
+                    twoflow  -> twoflow .discardChannel("remainderIsTwoChannel"))
+                .channel("remainderIsOneChannel")))
+            .channel("multipleofThreeChannel");
+    }
+
+}

spring-integration/src/main/java/com/baeldung/subflows/publishsubscribechannel/PublishSubscibeChannelExample.java

@@ -0,0 +1,60 @@
+package com.baeldung.subflows.publishsubscribechannel;
+
+import java.util.Collection;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.integration.annotation.Gateway;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.dsl.IntegrationFlow;
+
+@EnableIntegration
+@IntegrationComponentScan
+public class PublishSubscibeChannelExample {
+    @MessagingGateway
+    public interface NumbersClassifier {
+        @Gateway(requestChannel = "classify.input")
+        void classify(Collection<Integer> numbers);
+    }
+
+    @Bean
+    QueueChannel multipleofThreeChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsOneChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsTwoChannel() {
+        return new QueueChannel();
+    }
+    boolean isMultipleOfThree(Integer number) {
+        return number % 3 == 0;
+    }
+
+    boolean isRemainderOne(Integer number) {
+        return number % 3 == 1;
+    }
+
+    boolean isRemainderTwo(Integer number) {
+        return number % 3 == 2;
+    }
+    @Bean
+    public IntegrationFlow classify() {
+        return flow -> flow.split()
+            .publishSubscribeChannel(subscription -> subscription.subscribe(subflow -> subflow.<Integer> filter(this::isMultipleOfThree)
+                .channel("multipleofThreeChannel"))
+                .subscribe(subflow -> subflow.<Integer> filter(this::isRemainderOne)
+                    .channel("remainderIsOneChannel"))
+                .subscribe(subflow -> subflow.<Integer> filter(this::isRemainderTwo)
+                    .channel("remainderIsTwoChannel")));
+    }
+    
+
+}

spring-integration/src/main/java/com/baeldung/subflows/routeToRecipients/RouteToRecipientsExample.java

@@ -0,0 +1,60 @@
+package com.baeldung.subflows.routetorecipients;
+
+import java.util.Collection;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.integration.annotation.Gateway;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.dsl.IntegrationFlow;
+
+@EnableIntegration
+@IntegrationComponentScan
+public class RouteToRecipientsExample {
+    @MessagingGateway
+    public interface NumbersClassifier {
+        @Gateway(requestChannel = "classify.input")
+        void classify(Collection<Integer> numbers);
+    }
+
+    @Bean
+    QueueChannel multipleofThreeChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsOneChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsTwoChannel() {
+        return new QueueChannel();
+    }
+    boolean isMultipleOfThree(Integer number) {
+        return number % 3 == 0;
+    }
+
+    boolean isRemainderOne(Integer number) {
+        return number % 3 == 1;
+    }
+
+    boolean isRemainderTwo(Integer number) {
+        return number % 3 == 2;
+    }
+
+    @Bean
+    public IntegrationFlow classify() {
+        return flow -> flow.split()
+            .routeToRecipients(route -> route
+                .recipientFlow(subflow -> subflow
+                    .<Integer> filter(this::isMultipleOfThree)
+                    .channel("multipleofThreeChannel"))
+                .<Integer> recipient("remainderIsOneChannel",this::isRemainderOne)
+                .<Integer> recipient("remainderIsTwoChannel",this::isRemainderTwo));
+    }
+   
+
+}

spring-integration/src/main/java/com/baeldung/subflows/separateflows/SeparateFlowsExample.java

@@ -0,0 +1,77 @@
+package com.baeldung.subflows.separateflows;
+
+import java.util.Collection;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.integration.annotation.Gateway;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.dsl.IntegrationFlow;
+
+@EnableIntegration
+@IntegrationComponentScan
+public class SeparateFlowsExample {
+    @MessagingGateway
+    public interface NumbersClassifier {
+        @Gateway(requestChannel = "multipleOfThreeFlow.input")
+        void multipleofThree(Collection<Integer> numbers);
+
+        @Gateway(requestChannel = "remainderIsOneFlow.input")
+        void remainderIsOne(Collection<Integer> numbers);
+
+        @Gateway(requestChannel = "remainderIsTwoFlow.input")
+        void remainderIsTwo(Collection<Integer> numbers);
+    }
+    
+    @Bean
+    QueueChannel multipleOfThreeChannel() {
+        return new QueueChannel();
+    }
+ 
+    @Bean
+    QueueChannel remainderIsOneChannel() {
+        return new QueueChannel();
+    }
+ 
+    @Bean
+    QueueChannel remainderIsTwoChannel() {
+        return new QueueChannel();
+    }
+
+    boolean isMultipleOfThree(Integer number) {
+        return number % 3 == 0;
+    }
+
+    boolean isRemainderOne(Integer number) {
+        return number % 3 == 1;
+    }
+
+    boolean isRemainderTwo(Integer number) {
+        return number % 3 == 2;
+    }
+
+    @Bean
+    public IntegrationFlow multipleOfThreeFlow() {
+        return flow -> flow.split()
+            .<Integer> filter(this::isMultipleOfThree)
+            .channel("multipleOfThreeChannel");
+    }
+
+    @Bean
+    public IntegrationFlow remainderIsOneFlow() {
+        return flow -> flow.split()
+            .<Integer> filter(this::isRemainderOne)
+            .channel("remainderIsOneChannel");
+    }
+
+    @Bean
+    public IntegrationFlow remainderIsTwoFlow() {
+        return flow -> flow.split()
+            .<Integer> filter(this::isRemainderTwo)
+            .channel("remainderIsTwoChannel");
+    }
+
+}

spring-integration/src/main/java/com/baeldung/subflows/subflowmapping/RouterExample.java

@@ -0,0 +1,62 @@
+package com.baeldung.subflows.subflowmapping;
+
+import java.util.Collection;
+import org.springframework.context.annotation.Bean;
+import org.springframework.integration.annotation.Gateway;
+import org.springframework.integration.annotation.IntegrationComponentScan;
+import org.springframework.integration.annotation.MessagingGateway;
+import org.springframework.integration.channel.QueueChannel;
+import org.springframework.integration.config.EnableIntegration;
+import org.springframework.integration.dsl.IntegrationFlow;
+
+@EnableIntegration
+@IntegrationComponentScan
+public class RouterExample {
+    @MessagingGateway
+    public interface NumbersClassifier {
+        @Gateway(requestChannel = "classify.input")
+        void classify(Collection<Integer> numbers);
+    }
+
+    @Bean
+    QueueChannel multipleofThreeChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsOneChannel() {
+        return new QueueChannel();
+    }
+
+    @Bean
+    QueueChannel remainderIsTwoChannel() {
+        return new QueueChannel();
+    }
+
+    boolean isMultipleOfThree(Integer number) {
+        return number % 3 == 0;
+    }
+
+    boolean isRemainderOne(Integer number) {
+        return number % 3 == 1;
+    }
+
+    boolean isRemainderTwo(Integer number) {
+        return number % 3 == 2;
+    }
+
+    @Bean
+    public IntegrationFlow classify() {
+        return flow -> flow.split()
+            .<Integer, Integer> route(number -> number % 3, 
+                mapping -> mapping
+                  .channelMapping(0, "multipleofThreeChannel")
+                  .subFlowMapping(1, subflow -> subflow.channel("remainderIsOneChannel"))
+                  .subFlowMapping(2, subflow -> subflow
+                      .<Integer> handle((payload, headers) -> {
+                          // do extra work on the payload
+                         return payload;
+                      }))).channel("remainderIsTwoChannel");
+    }
+
+}