.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{java}]
+indent_style = space
+indent_size = 4
+tab_width = 4
+trim_trailing_whitespace = true
+max_line_length = 100

executor1/pom.xml

@@ -30,6 +30,10 @@
 			<scope>runtime</scope>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-validation</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.projectlombok</groupId>
 			<artifactId>lombok</artifactId>
@@ -40,6 +44,18 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+
+		<dependency>
+            <groupId>javax.validation</groupId>
+            <artifactId>validation-api</artifactId>
+            <version>1.1.0.Final</version>
+        </dependency>
+
+		<dependency>
+			<groupId>javax.transaction</groupId>
+			<artifactId>javax.transaction-api</artifactId>
+			<version>1.2</version>
+		</dependency>
 	</dependencies>
 
 	<build>

executor1/src/main/java/ch/unisg/executor1/Executor1Application.java

@@ -3,11 +3,14 @@ package ch.unisg.executor1;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
+import ch.unisg.executor1.executor.domain.Executor;
+
 @SpringBootApplication
 public class Executor1Application {
 
 	public static void main(String[] args) {
 		SpringApplication.run(Executor1Application.class, args);
+		Executor.getExecutor();
 	}
 
 }

executor1/src/main/java/ch/unisg/executor1/TestController.java

@@ -1,12 +0,0 @@
-package ch.unisg.executor1;
-
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RestController;
-
-@RestController
-public class TestController {
-    @RequestMapping("/")
-    public String index() {
-        return "Hello World! Executor1";
-    }
-}

executor1/src/main/java/ch/unisg/executor1/common/SelfValidating.java

@@ -0,0 +1,29 @@
+package ch.unisg.executor1.common;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.ConstraintViolationException;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import javax.validation.ValidatorFactory;
+import java.util.Set;
+
+public class SelfValidating<T> {
+
+    private Validator validator;
+
+    public SelfValidating() {
+        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
+        validator = factory.getValidator();
+    }
+
+    /**
+     * Evaluates all Bean Validations on the attributes of this
+     * instance.
+     */
+    protected void validateSelf() {
+        Set<ConstraintViolation<T>> violations = validator.validate((T) this);
+        if (!violations.isEmpty()) {
+            throw new ConstraintViolationException(violations);
+        }
+    }
+}

executor1/src/main/java/ch/unisg/executor1/executor/adapter/in/web/TaskAvailableController.java

@@ -0,0 +1,32 @@
+package ch.unisg.executor1.executor.adapter.in.web;
+
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+import ch.unisg.executor1.executor.application.port.in.TaskAvailableCommand;
+import ch.unisg.executor1.executor.application.port.in.TaskAvailableUseCase;
+
+@RestController
+public class TaskAvailableController {
+    private final TaskAvailableUseCase taskAvailableUseCase;
+
+    public TaskAvailableController(TaskAvailableUseCase taskAvailableUseCase) {
+        this.taskAvailableUseCase = taskAvailableUseCase;
+    }
+
+    @GetMapping(path = "/newtask/{taskType}")
+    public ResponseEntity<String> retrieveTaskFromTaskList(@PathVariable("taskType") String taskType) {
+        TaskAvailableCommand command = new TaskAvailableCommand(taskType);
+        
+        taskAvailableUseCase.newTaskAvailable(command);
+        
+        // Add the content type as a response header
+        HttpHeaders responseHeaders = new HttpHeaders();
+
+        return new ResponseEntity<>("OK", responseHeaders, HttpStatus.OK);
+    }
+}

executor1/src/main/java/ch/unisg/executor1/executor/adapter/out/web/ExecutionFinishedAdapter.java

@@ -0,0 +1,58 @@
+package ch.unisg.executor1.executor.adapter.out.web;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.HashMap;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+import ch.unisg.executor1.executor.application.port.out.ExecutionFinishedEventPort;
+import ch.unisg.executor1.executor.domain.ExecutionFinishedEvent;
+
+public class ExecutionFinishedAdapter implements ExecutionFinishedEventPort {
+
+    //This is the base URI of the service interested in this event (in my setup, running locally as separate Spring Boot application)
+    String server = "http://127.0.0.1:8082";
+
+    @Override
+    public void publishExecutionFinishedEvent(ExecutionFinishedEvent event) {
+        ///Here we would need to work with DTOs in case the payload of calls becomes more complex
+
+        var values = new HashMap<String, String>() {{
+            put("result",event.getResult());
+            put("status",event.getStatus());
+        }};
+
+        var objectMapper = new ObjectMapper();
+        String requestBody = null;
+        try {
+            requestBody = objectMapper.writeValueAsString(values);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
+
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(server+"/task/"+event.getTaskID()))
+                .PUT(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        /** Needs the other service running
+        try {
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+         **/
+
+        System.out.println("Finish execution event sent");
+        
+    }
+    
+}

executor1/src/main/java/ch/unisg/executor1/executor/adapter/out/web/GetAssignmentAdapter.java

@@ -0,0 +1,44 @@
+package ch.unisg.executor1.executor.adapter.out.web;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+import ch.unisg.executor1.executor.application.port.out.GetAssignmentPort;
+import ch.unisg.executor1.executor.domain.Task;
+
+@Component
+@Primary
+public class GetAssignmentAdapter implements GetAssignmentPort {
+
+    //This is the base URI of the service interested in this event (in my setup, running locally as separate Spring Boot application)
+    String server = "http://127.0.0.1:8082";
+
+    @Override
+    public Task getAssignment(String executorType) {
+        
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(server+"/assignment/" + executorType))
+                .GET()
+                .build();
+
+        /** Needs the other service running
+        try {
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+         **/
+
+         // TODO return null or a new Task here depending on the response of the http call
+
+         return new Task("1234");
+    }
+    
+}

executor1/src/main/java/ch/unisg/executor1/executor/adapter/out/web/NotifyExecutorPoolAdapter.java

@@ -0,0 +1,61 @@
+package ch.unisg.executor1.executor.adapter.out.web;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.util.HashMap;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.springframework.context.annotation.Primary;
+import org.springframework.stereotype.Component;
+
+import ch.unisg.executor1.executor.application.port.out.NotifyExecutorPoolPort;
+
+@Component
+@Primary
+public class NotifyExecutorPoolAdapter implements NotifyExecutorPoolPort {
+    
+    //This is the base URI of the service interested in this event (in my setup, running locally as separate Spring Boot application)
+    String server = "http://127.0.0.1:8083";
+
+    @Override
+    public boolean notifyExecutorPool(String ip, int port, String executorType) {
+
+        var values = new HashMap<String, String>() {{
+            put("ip", ip);
+            put("port", Integer.toString(port));
+            put("executorType", executorType);
+        }};
+
+        var objectMapper = new ObjectMapper();
+        String requestBody = null;
+        try {
+            requestBody = objectMapper.writeValueAsString(values);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
+
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(server+"/executor/new/"))
+                .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        /** Needs the other service running
+        try {
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+         **/
+
+         // TODO return true or false depending on result of http request;
+
+         return true;
+    }
+
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/port/in/TaskAvailableCommand.java

@@ -0,0 +1,19 @@
+package ch.unisg.executor1.executor.application.port.in;
+
+import ch.unisg.executor1.common.SelfValidating;
+
+import javax.validation.constraints.NotNull;
+
+import lombok.Value;
+
+@Value
+public class TaskAvailableCommand extends SelfValidating<TaskAvailableCommand> {
+    
+    @NotNull
+    private final String taskType;
+
+    public TaskAvailableCommand(String taskType) {
+        this.taskType = taskType;
+        this.validateSelf();
+    }
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/port/in/TaskAvailableUseCase.java

@@ -0,0 +1,5 @@
+package ch.unisg.executor1.executor.application.port.in;
+
+public interface TaskAvailableUseCase {
+    void newTaskAvailable(TaskAvailableCommand command);
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/port/out/ExecutionFinishedEventPort.java

@@ -0,0 +1,7 @@
+package ch.unisg.executor1.executor.application.port.out;
+
+import ch.unisg.executor1.executor.domain.ExecutionFinishedEvent;
+
+public interface ExecutionFinishedEventPort {
+    void publishExecutionFinishedEvent(ExecutionFinishedEvent event);
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/port/out/GetAssignmentPort.java

@@ -0,0 +1,7 @@
+package ch.unisg.executor1.executor.application.port.out;
+
+import ch.unisg.executor1.executor.domain.Task;
+
+public interface GetAssignmentPort {
+    Task getAssignment(String executorType);
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/port/out/NotifyExecutorPoolPort.java

@@ -0,0 +1,5 @@
+package ch.unisg.executor1.executor.application.port.out;
+
+public interface NotifyExecutorPoolPort {
+    boolean notifyExecutorPool(String ip, int port, String executorType);
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/service/NotifyExecutorPoolService.java

@@ -0,0 +1,17 @@
+package ch.unisg.executor1.executor.application.service;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import ch.unisg.executor1.executor.application.port.out.NotifyExecutorPoolPort;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public class NotifyExecutorPoolService {
+
+	private final NotifyExecutorPoolPort notifyExecutorPoolPort;
+
+	public boolean notifyExecutorPool(String ip, int port, String executorType) {
+		return notifyExecutorPoolPort.notifyExecutorPool(ip, port, executorType);
+	}
+}

executor1/src/main/java/ch/unisg/executor1/executor/application/service/TaskAvailableService.java

@@ -0,0 +1,27 @@
+package ch.unisg.executor1.executor.application.service;
+
+import org.springframework.stereotype.Component;
+
+import ch.unisg.executor1.executor.application.port.in.TaskAvailableCommand;
+import ch.unisg.executor1.executor.application.port.in.TaskAvailableUseCase;
+import ch.unisg.executor1.executor.domain.Executor;
+import ch.unisg.executor1.executor.domain.ExecutorStatus;
+import lombok.RequiredArgsConstructor;
+
+import javax.transaction.Transactional;
+
+@RequiredArgsConstructor
+@Component
+@Transactional
+public class TaskAvailableService implements TaskAvailableUseCase {
+
+    @Override
+    public void newTaskAvailable(TaskAvailableCommand command) {
+        Executor executor = Executor.getExecutor();
+
+        if (executor.getExecutorType().equalsIgnoreCase(command.getTaskType()) && 
+            executor.getStatus() == ExecutorStatus.IDLING) {
+            executor.getAssignment();
+        }
+    }
+}

executor1/src/main/java/ch/unisg/executor1/executor/domain/ExecutionFinishedEvent.java

@@ -0,0 +1,21 @@
+package ch.unisg.executor1.executor.domain;
+
+import lombok.Getter;
+
+public class ExecutionFinishedEvent {
+    
+    @Getter
+    private String taskID;
+    
+    @Getter
+    private String result;
+
+    @Getter
+    private String status;
+
+    public ExecutionFinishedEvent(String taskID, String result, String status) {
+        this.taskID = taskID;
+        this.result = result;
+        this.status = status;
+    }
+}

executor1/src/main/java/ch/unisg/executor1/executor/domain/Executor.java

@@ -0,0 +1,93 @@
+package ch.unisg.executor1.executor.domain;
+
+import ch.unisg.executor1.executor.application.port.out.ExecutionFinishedEventPort;
+import ch.unisg.executor1.executor.application.port.out.GetAssignmentPort;
+import ch.unisg.executor1.executor.application.port.out.NotifyExecutorPoolPort;
+
+import java.util.concurrent.TimeUnit;
+
+import javax.transaction.Transactional;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Configurable;
+
+import ch.unisg.executor1.executor.adapter.out.web.ExecutionFinishedAdapter;
+import ch.unisg.executor1.executor.adapter.out.web.GetAssignmentAdapter;
+import ch.unisg.executor1.executor.adapter.out.web.NotifyExecutorPoolAdapter;
+import ch.unisg.executor1.executor.application.service.NotifyExecutorPoolService;
+import lombok.Getter;
+
+public class Executor {
+
+    @Getter
+    private String ip;
+
+    @Getter
+    private String executorType = "addition";
+
+    @Getter
+    private int port;
+
+    @Getter
+    private ExecutorStatus status;
+
+    private static final Executor executor = new Executor();
+
+    // TODO Violation of the Dependency Inversion Principle?, but we havn't really got a better solutions to send a http request / access a service from a domain model
+    // TODO I guess we can somehow autowire this but I don't know why it's not working :D
+    private final NotifyExecutorPoolPort notifyExecutorPoolPort = new NotifyExecutorPoolAdapter();
+	private final NotifyExecutorPoolService notifyExecutorPoolService = new NotifyExecutorPoolService(notifyExecutorPoolPort);
+    private final GetAssignmentPort getAssignmentPort = new GetAssignmentAdapter();
+    private final ExecutionFinishedEventPort executionFinishedEventPort = new ExecutionFinishedAdapter();
+
+    private Executor() {
+        System.out.println("Starting Executor");
+        // TODO set this automaticly
+        this.ip = "localhost";
+        this.port = 8084;
+    
+        this.status = ExecutorStatus.STARTING_UP;
+        if(!notifyExecutorPoolService.notifyExecutorPool(this.ip, this.port, this.executorType)) {
+            System.exit(0);
+        } else {
+            System.out.println(true);
+            this.status = ExecutorStatus.IDLING;
+            getAssignment();
+        }
+    }
+
+    public static Executor getExecutor() {
+        return executor;
+    }
+
+    public void getAssignment() {
+        Task newTask = getAssignmentPort.getAssignment(this.getExecutorType());
+        if (newTask != null) {
+            this.executeTask(newTask);
+        } else {
+            this.status = ExecutorStatus.IDLING;
+        }
+    }
+
+    private void executeTask(Task task) {
+        System.out.println("Starting execution");
+        this.status = ExecutorStatus.EXECUTING;
+        int a = 10;
+        int b = 20;
+        try {
+            TimeUnit.SECONDS.sleep(10);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+
+        int result = a + b;
+
+        task.setResult(Integer.toString(result));
+
+        executionFinishedEventPort.publishExecutionFinishedEvent(new ExecutionFinishedEvent(task.getTaskID(), task.getResult(), "SUCCESS"));
+
+        System.out.println("Finish execution");
+        getAssignment();
+    }
+    
+}

executor1/src/main/java/ch/unisg/executor1/executor/domain/ExecutorStatus.java

@@ -0,0 +1,7 @@
+package ch.unisg.executor1.executor.domain;
+
+public enum ExecutorStatus {
+    STARTING_UP,
+    EXECUTING,
+    IDLING,
+}

executor1/src/main/java/ch/unisg/executor1/executor/domain/Task.java

@@ -0,0 +1,20 @@
+package ch.unisg.executor1.executor.domain;
+
+import lombok.Data;
+import lombok.Getter;
+import lombok.Setter;
+
+public class Task {
+    
+    @Getter
+    private String taskID;
+
+    @Getter
+    @Setter
+    private String result;
+
+    public Task(String taskID) {
+        this.taskID = taskID;
+    }
+
+}