BAEL-3059: Update Play Framework (#7674)

* Implementation of Introduction to Play Framework in Java

* Implementation of Introduction to Play Framework in Java

* Implementation of Introduction to Play Framework in Java

* Implementation of the tutorial for Introduction to Play Framework.

* Updated code for Play Routing to 2.7.3

* Updated code for Play Routing to 2.7.3

* Initial Commit

* Added request object to create end point

* Finished implementing student-api

* Finished implementing student-api

* Implementation of the tutorial for Introduction to Play Framework.

* Updated test names

* Removed Lombok dependency

* Corrected isSuccessful spelling and removed the +1 on student ids

play-framework/student-api/app/controllers/StudentController.java

@@ -0,0 +1,91 @@
+package controllers;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import model.Student;
+import play.libs.Json;
+import play.libs.concurrent.HttpExecutionContext;
+import play.mvc.Controller;
+import play.mvc.Http;
+import play.mvc.Result;
+import store.StudentStore;
+import utils.Util;
+
+import javax.inject.Inject;
+import java.util.Optional;
+import java.util.Set;
+import java.util.concurrent.CompletionStage;
+
+import static java.util.concurrent.CompletableFuture.supplyAsync;
+
+public class StudentController extends Controller {
+    private HttpExecutionContext ec;
+    private StudentStore studentStore;
+
+    @Inject
+    public StudentController(HttpExecutionContext ec, StudentStore studentStore) {
+        this.studentStore = studentStore;
+        this.ec = ec;
+    }
+
+    public CompletionStage<Result> create(Http.Request request) {
+        JsonNode json = request.body().asJson();
+        return supplyAsync(() -> {
+            if (json == null) {
+                return badRequest(Util.createResponse("Expecting Json data", false));
+            }
+
+            Optional<Student> studentOptional = studentStore.addStudent(Json.fromJson(json, Student.class));
+            return studentOptional.map(student -> {
+                JsonNode jsonObject = Json.toJson(student);
+                return created(Util.createResponse(jsonObject, true));
+            }).orElse(internalServerError(Util.createResponse("Could not create data.", false)));
+        }, ec.current());
+    }
+
+    public CompletionStage<Result> listStudents() {
+        return supplyAsync(() -> {
+            Set<Student> result = studentStore.getAllStudents();
+            ObjectMapper mapper = new ObjectMapper();
+            JsonNode jsonData = mapper.convertValue(result, JsonNode.class);
+            return ok(Util.createResponse(jsonData, true));
+        }, ec.current());
+    }
+
+    public CompletionStage<Result> retrieve(int id) {
+        return supplyAsync(() -> {
+            final Optional<Student> studentOptional = studentStore.getStudent(id);
+            return studentOptional.map(student -> {
+                JsonNode jsonObjects = Json.toJson(student);
+                return ok(Util.createResponse(jsonObjects, true));
+            }).orElse(notFound(Util.createResponse("Student with id:" + id + " not found", false)));
+        }, ec.current());
+    }
+
+    public CompletionStage<Result> update(Http.Request request) {
+        JsonNode json = request.body().asJson();
+        return supplyAsync(() -> {
+            if (json == null) {
+                return badRequest(Util.createResponse("Expecting Json data", false));
+            }
+            Optional<Student> studentOptional = studentStore.updateStudent(Json.fromJson(json, Student.class));
+            return studentOptional.map(student -> {
+                if (student == null) {
+                    return notFound(Util.createResponse("Student not found", false));
+                }
+                JsonNode jsonObject = Json.toJson(student);
+                return ok(Util.createResponse(jsonObject, true));
+            }).orElse(internalServerError(Util.createResponse("Could not create data.", false)));
+        }, ec.current());
+    }
+
+    public CompletionStage<Result> delete(int id) {
+        return supplyAsync(() -> {
+            boolean status = studentStore.deleteStudent(id);
+            if (!status) {
+                return notFound(Util.createResponse("Student with id:" + id + " not found", false));
+            }
+            return ok(Util.createResponse("Student with id:" + id + " deleted", true));
+        }, ec.current());
+    }
+}

play-framework/student-api/app/model/Student.java

@@ -0,0 +1,50 @@
+package model;
+
+public class Student {
+    private String firstName;
+    private String lastName;
+    private int age;
+    private int id;
+
+    public Student() {
+    }
+
+    public Student(String firstName, String lastName, int age, int id) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.age = age;
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+}

play-framework/student-api/app/store/StudentStore.java

@@ -0,0 +1,37 @@
+package store;
+
+import model.Student;
+
+import java.util.*;
+
+public class StudentStore {
+    private Map<Integer, Student> students = new HashMap<>();
+
+    public Optional<Student> addStudent(Student student) {
+        int id = students.size();
+        student.setId(id);
+        students.put(id, student);
+        return Optional.ofNullable(student);
+    }
+
+    public Optional<Student> getStudent(int id) {
+        return Optional.ofNullable(students.get(id));
+    }
+
+    public Set<Student> getAllStudents() {
+        return new HashSet<>(students.values());
+    }
+
+    public Optional<Student> updateStudent(Student student) {
+        int id = student.getId();
+        if (students.containsKey(id)) {
+            students.put(id, student);
+            return Optional.ofNullable(student);
+        }
+        return Optional.empty();
+    }
+
+    public boolean deleteStudent(int id) {
+        return students.remove(id) != null;
+    }
+}

play-framework/student-api/app/utils/Util.java

@@ -0,0 +1,17 @@
+package utils;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import play.libs.Json;
+
+public class Util {
+    public static ObjectNode createResponse(Object response, boolean ok) {
+        ObjectNode result = Json.newObject();
+        result.put("isSuccessful", ok);
+        if (response instanceof String) {
+            result.put("body", (String) response);
+        } else {
+            result.putPOJO("body", response);
+        }
+        return result;
+    }
+}