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

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

spring-boot-flowable/src/main/java/com/baeldung/Application.java

@@ -0,0 +1,13 @@
+package com.baeldung;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+
+}

spring-boot-flowable/src/main/java/com/baeldung/controller/ArticleWorkflowController.java

@@ -0,0 +1,32 @@
+package com.baeldung.controller;
+
+import java.util.List;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.domain.Approval;
+import com.baeldung.domain.Article;
+import com.baeldung.service.ArticleWorkflowService;
+
+@RestController
+public class ArticleWorkflowController {
+    @Autowired
+    private ArticleWorkflowService service;
+    @PostMapping("/submit")
+    public void submit(@RequestBody Article article) {
+        service.startProcess(article);
+    }
+    @GetMapping("/tasks")
+    public List<Article> getTasks(@RequestParam String assignee) {
+        return service.getTasks(assignee);
+    }
+    @PostMapping("/review")
+    public void review(@RequestBody Approval approval) {
+        service.submitReview(approval);
+    }
+}

spring-boot-flowable/src/main/java/com/baeldung/domain/Approval.java

@@ -0,0 +1,24 @@
+package com.baeldung.domain;
+
+public class Approval {
+
+    private String id;
+    private boolean status;
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public boolean isStatus() {
+        return status;
+    }
+
+    public void setStatus(boolean status) {
+        this.status = status;
+    }
+
+}

spring-boot-flowable/src/main/java/com/baeldung/domain/Article.java

@@ -0,0 +1,52 @@
+package com.baeldung.domain;
+
+public class Article {
+
+    private String id;
+    private String author;
+    private String url;
+
+    public Article() {
+    }
+
+    public Article(String author, String url) {
+        this.author = author;
+        this.url = url;
+    }
+
+    public Article(String id, String author, String url) {
+        this.id = id;
+        this.author = author;
+        this.url = url;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    @Override
+    public String toString() {
+        return ("[" + this.author + " " + this.url + "]");
+    }
+
+}

spring-boot-flowable/src/main/java/com/baeldung/service/ArticleWorkflowService.java

@@ -0,0 +1,55 @@
+package com.baeldung.service;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+import org.flowable.engine.RuntimeService;
+import org.flowable.engine.TaskService;
+import org.flowable.task.api.Task;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.baeldung.domain.Approval;
+import com.baeldung.domain.Article;
+
+@Service
+public class ArticleWorkflowService {
+    @Autowired
+    private RuntimeService runtimeService;
+    @Autowired
+    private TaskService taskService;
+
+    @Transactional
+    public void startProcess(Article article) {
+        Map<String, Object> variables = new HashMap<String, Object>();
+        variables.put("author", article.getAuthor());
+        variables.put("url", article.getUrl());
+        runtimeService.startProcessInstanceByKey("articleReview", variables);
+    }
+
+    @Transactional
+    public List<Article> getTasks(String assignee) {
+        List<Task> tasks = taskService.createTaskQuery()
+          .taskCandidateGroup(assignee)
+          .list();
+        
+        List<Article> articles = tasks.stream()
+          .map(task -> {
+              Map<String, Object> variables = taskService.getVariables(task.getId());
+              return new Article(
+                task.getId(), (String) variables.get("author"), (String) variables.get("url"));
+          })
+          .collect(Collectors.toList());
+        return articles;
+    }
+
+    @Transactional
+    public void submitReview(Approval approval) {
+        Map<String, Object> variables = new HashMap<String, Object>();
+        variables.put("approved", approval.isStatus());
+        taskService.complete(approval.getId(), variables);
+    }
+}

spring-boot-flowable/src/main/java/com/baeldung/service/PublishArticleService.java

@@ -0,0 +1,10 @@
+package com.baeldung.service;
+
+import org.flowable.engine.delegate.DelegateExecution;
+import org.flowable.engine.delegate.JavaDelegate;
+
+public class PublishArticleService implements JavaDelegate {
+    public void execute(DelegateExecution execution) {
+        System.out.println("Publishing the approved article.");
+    }
+}

spring-boot-flowable/src/main/java/com/baeldung/service/SendMailService.java

@@ -0,0 +1,10 @@
+package com.baeldung.service;
+
+import org.flowable.engine.delegate.DelegateExecution;
+import org.flowable.engine.delegate.JavaDelegate;
+
+public class SendMailService implements JavaDelegate {
+    public void execute(DelegateExecution execution) {
+        System.out.println("Sending rejection mail to author.");
+    }
+}