executor-pool/pom.xml

@@ -45,7 +45,27 @@
 			<artifactId>json</artifactId>
 			<version>20210307</version>
 		</dependency>
-	</dependencies>
+        <dependency>
+            <groupId>javax.validation</groupId>
+            <artifactId>validation-api</artifactId>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>jakarta.validation</groupId>
+            <artifactId>jakarta.validation-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>ch.unisg</groupId>
+            <artifactId>tapas-tasks</artifactId>
+            <version>0.0.1-SNAPSHOT</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>javax.transaction</groupId>
+            <artifactId>javax.transaction-api</artifactId>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
 	<build>
 		<plugins>

executor-pool/src/main/java/ch/unisg/executorpool/adapter/in/web/AddNewExecutorToExecutorPoolWebController.java

@@ -0,0 +1,40 @@
+package ch.unisg.executorpool.adapter.in.web;
+
+import ch.unisg.executorpool.application.port.in.AddNewExecutorToExecutorPoolUseCase;
+import ch.unisg.executorpool.application.port.in.AddNewExecutorToExecutorPoolCommand;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
+import javax.validation.ConstraintViolationException;
+
+@RestController
+public class AddNewExecutorToExecutorPoolWebController {
+    private final AddNewExecutorToExecutorPoolUseCase addNewExecutorToExecutorPoolUseCase;
+
+    public AddNewExecutorToExecutorPoolWebController(AddNewExecutorToExecutorPoolUseCase addNewExecutorToExecutorPoolUseCase){
+        this.addNewExecutorToExecutorPoolUseCase = addNewExecutorToExecutorPoolUseCase;
+    }
+
+    @PostMapping(path = "/executor-pool/AddExecutor", consumes = {ExecutorMediaType.EXECUTOR_MEDIA_TYPE})
+    public ResponseEntity<String> addNewExecutorToExecutorPool(@RequestBody ExecutorClass executorClass){
+        try{
+            AddNewExecutorToExecutorPoolCommand command = new AddNewExecutorToExecutorPoolCommand(
+                    executorClass.getExecutorIp(), executorClass.getExecutorPort(), executorClass.getExecutorTaskType()
+            );
+
+            ExecutorClass newExecutor = addNewExecutorToExecutorPoolUseCase.addNewExecutorToExecutorPool(command);
+
+            HttpHeaders responseHeaders = new HttpHeaders();
+            responseHeaders.add(HttpHeaders.CONTENT_TYPE, ExecutorMediaType.EXECUTOR_MEDIA_TYPE);
+
+            return new ResponseEntity<>(ExecutorMediaType.serialize(newExecutor), responseHeaders, HttpStatus.CREATED);
+        } catch (ConstraintViolationException e){
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, e.getMessage());
+        }
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/adapter/in/web/ExecutorMediaType.java

@@ -0,0 +1,33 @@
+package ch.unisg.executorpool.adapter.in.web;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+import org.json.JSONArray;
+import org.json.JSONObject;
+
+import java.util.List;
+
+final public class ExecutorMediaType {
+    public static final String EXECUTOR_MEDIA_TYPE = "application/json";
+
+    public static String serialize(ExecutorClass executorClass) {
+        JSONObject payload = new JSONObject();
+
+        payload.put("executorIp", executorClass.getExecutorIp().getValue());
+        payload.put("executorPort", executorClass.getExecutorPort().getValue());
+        payload.put("executorTaskType", executorClass.getExecutorTaskType().getValue());
+
+        return payload.toString();
+    }
+
+    public static String serialize(List<ExecutorClass> listOfExecutors) {
+        String serializedList = "[ \n";
+
+        for (ExecutorClass executor: listOfExecutors) {
+            serializedList += serialize(executor) + ",\n";
+        }
+
+        return serializedList + "\n ]";
+    }
+
+    private ExecutorMediaType() { }
+}

executor-pool/src/main/java/ch/unisg/executorpool/adapter/in/web/GetAllExecutorInExecutorPoolByTypeWebController.java

@@ -0,0 +1,35 @@
+package ch.unisg.executorpool.adapter.in.web;
+
+import ch.unisg.executorpool.application.port.in.GetAllExecutorInExecutorPoolByTypeQuery;
+import ch.unisg.executorpool.application.port.in.GetAllExecutorInExecutorPoolByTypeUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorTaskType;
+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 java.util.List;
+
+@RestController
+public class GetAllExecutorInExecutorPoolByTypeWebController {
+    private final GetAllExecutorInExecutorPoolByTypeUseCase getAllExecutorInExecutorPoolByTypeUseCase;
+
+    public GetAllExecutorInExecutorPoolByTypeWebController(GetAllExecutorInExecutorPoolByTypeUseCase getAllExecutorInExecutorPoolByTypeUseCase){
+        this.getAllExecutorInExecutorPoolByTypeUseCase = getAllExecutorInExecutorPoolByTypeUseCase;
+    }
+
+    @GetMapping(path = "/executor-pool/GetAllExecutorInExecutorPoolByType/{taskType}")
+    public ResponseEntity<String> getAllExecutorInExecutorPoolByType(@PathVariable("taskType") String taskType){
+        GetAllExecutorInExecutorPoolByTypeQuery query = new GetAllExecutorInExecutorPoolByTypeQuery(new ExecutorTaskType(taskType));
+        List<ExecutorClass> matchedExecutors = getAllExecutorInExecutorPoolByTypeUseCase.getAllExecutorInExecutorPoolByType(query);
+
+        // Add the content type as a response header
+        HttpHeaders responseHeaders = new HttpHeaders();
+        responseHeaders.add(HttpHeaders.CONTENT_TYPE, ExecutorMediaType.EXECUTOR_MEDIA_TYPE);
+
+        return new ResponseEntity<>(ExecutorMediaType.serialize(matchedExecutors), responseHeaders, HttpStatus.OK);
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/adapter/in/web/GetAllExecutorsInExecutorPoolWebController.java

@@ -0,0 +1,32 @@
+package ch.unisg.executorpool.adapter.in.web;
+
+import ch.unisg.executorpool.application.port.in.GetAllExecutorsInExecutorPoolUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.tapastasks.tasks.adapter.in.web.TaskMediaType;
+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.RestController;
+
+import java.util.List;
+
+@RestController
+public class GetAllExecutorsInExecutorPoolWebController {
+    private final GetAllExecutorsInExecutorPoolUseCase getAllExecutorsInExecutorPoolUseCase;
+
+    public GetAllExecutorsInExecutorPoolWebController(GetAllExecutorsInExecutorPoolUseCase getAllExecutorsInExecutorPoolUseCase){
+        this.getAllExecutorsInExecutorPoolUseCase = getAllExecutorsInExecutorPoolUseCase;
+    }
+
+    @GetMapping(path = "executor-pool/GetAllExecutorsinExecutorPool")
+    public ResponseEntity<String> getAllExecutorsInExecutorPool(){
+        List<ExecutorClass> executorClassList = getAllExecutorsInExecutorPoolUseCase.getAllExecutorsInExecutorPool();
+
+        // Add the content type as a response header
+        HttpHeaders responseHeaders = new HttpHeaders();
+        responseHeaders.add(HttpHeaders.CONTENT_TYPE, ExecutorMediaType.EXECUTOR_MEDIA_TYPE);
+
+        return new ResponseEntity<>(ExecutorMediaType.serialize(executorClassList), responseHeaders, HttpStatus.OK);
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/adapter/in/web/RemoveExecutorFromExecutorPoolWebController.java

@@ -0,0 +1,39 @@
+package ch.unisg.executorpool.adapter.in.web;
+
+import ch.unisg.executorpool.application.port.in.RemoveExecutorFromExecutorPoolCommand;
+import ch.unisg.executorpool.application.port.in.RemoveExecutorFromExecutorPoolUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.Optional;
+
+@RestController
+public class RemoveExecutorFromExecutorPoolWebController {
+    private final RemoveExecutorFromExecutorPoolUseCase removeExecutorFromExecutorPoolUseCase;
+
+    public RemoveExecutorFromExecutorPoolWebController(RemoveExecutorFromExecutorPoolUseCase removeExecutorFromExecutorPoolUseCase){
+        this.removeExecutorFromExecutorPoolUseCase = removeExecutorFromExecutorPoolUseCase;
+    }
+
+    @PostMapping(path = "/executor-pool/RemoveExecutor", consumes = {ExecutorMediaType.EXECUTOR_MEDIA_TYPE})
+    public ResponseEntity<String> removeExecutorFromExecutorPool(@RequestBody ExecutorClass executorClass){
+        RemoveExecutorFromExecutorPoolCommand command = new RemoveExecutorFromExecutorPoolCommand(executorClass.getExecutorIp(), executorClass.getExecutorPort());
+        Optional<ExecutorClass> removedExecutor = removeExecutorFromExecutorPoolUseCase.removeExecutorFromExecutorPool(command);
+
+        if(removedExecutor.isEmpty()){
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND);
+        }
+
+        HttpHeaders responseHeaders = new HttpHeaders();
+        responseHeaders.add(HttpHeaders.CONTENT_TYPE, ExecutorMediaType.EXECUTOR_MEDIA_TYPE);
+
+        return new ResponseEntity<>(ExecutorMediaType.serialize(removedExecutor.get()), responseHeaders,
+                HttpStatus.OK);
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/AddNewExecutorToExecutorPoolCommand.java

@@ -0,0 +1,28 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorPool;
+import ch.unisg.tapastasks.common.SelfValidating;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorIp;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorPort;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorTaskType;
+import lombok.Value;
+import javax.validation.constraints.NotNull;
+
+@Value
+public class AddNewExecutorToExecutorPoolCommand extends SelfValidating<AddNewExecutorToExecutorPoolCommand> {
+    @NotNull
+    private final ExecutorIp executorIp;
+
+    @NotNull
+    private final ExecutorPort executorPort;
+
+    @NotNull
+    private final ExecutorTaskType executorTaskType;
+
+    public AddNewExecutorToExecutorPoolCommand(ExecutorIp executorIp, ExecutorPort executorPort, ExecutorTaskType executorTaskType){
+        this.executorIp = executorIp;
+        this.executorPort = executorPort;
+        this.executorTaskType = executorTaskType;
+        this.validateSelf();
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/AddNewExecutorToExecutorPoolUseCase.java

@@ -0,0 +1,7 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+
+public interface AddNewExecutorToExecutorPoolUseCase {
+    ExecutorClass addNewExecutorToExecutorPool(AddNewExecutorToExecutorPoolCommand command);
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/GetAllExecutorInExecutorPoolByTypeQuery.java

@@ -0,0 +1,18 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorTaskType;
+import ch.unisg.tapastasks.common.SelfValidating;
+import lombok.Value;
+
+import javax.validation.constraints.NotNull;
+
+@Value
+public class GetAllExecutorInExecutorPoolByTypeQuery extends SelfValidating<GetAllExecutorInExecutorPoolByTypeQuery> {
+    @NotNull
+    private final ExecutorTaskType executorTaskType;
+
+    public GetAllExecutorInExecutorPoolByTypeQuery(ExecutorTaskType executorTaskType){
+        this.executorTaskType = executorTaskType;
+        this.validateSelf();
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/GetAllExecutorInExecutorPoolByTypeUseCase.java

@@ -0,0 +1,9 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+
+import java.util.List;
+
+public interface GetAllExecutorInExecutorPoolByTypeUseCase {
+    List<ExecutorClass> getAllExecutorInExecutorPoolByType(GetAllExecutorInExecutorPoolByTypeQuery query);
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/GetAllExecutorsInExecutorPoolUseCase.java

@@ -0,0 +1,10 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorPool;
+
+import java.util.List;
+
+public interface GetAllExecutorsInExecutorPoolUseCase {
+    List<ExecutorClass> getAllExecutorsInExecutorPool();
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/RemoveExecutorFromExecutorPoolCommand.java

@@ -0,0 +1,24 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.tapastasks.common.SelfValidating;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorIp;
+import ch.unisg.executorpool.domain.ExecutorClass.ExecutorPort;
+import lombok.Value;
+
+import javax.validation.constraints.NotNull;
+
+@Value
+public class RemoveExecutorFromExecutorPoolCommand extends SelfValidating<RemoveExecutorFromExecutorPoolCommand> {
+    @NotNull
+    private final ExecutorIp executorIp;
+
+    @NotNull
+    private final ExecutorPort executorPort;
+
+    public RemoveExecutorFromExecutorPoolCommand(ExecutorIp executorIp, ExecutorPort executorPort){
+        this.executorIp = executorIp;
+        this.executorPort = executorPort;
+        this.validateSelf();
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/port/in/RemoveExecutorFromExecutorPoolUseCase.java

@@ -0,0 +1,9 @@
+package ch.unisg.executorpool.application.port.in;
+
+import ch.unisg.executorpool.domain.ExecutorClass;
+
+import java.util.Optional;
+
+public interface RemoveExecutorFromExecutorPoolUseCase {
+    Optional<ExecutorClass> removeExecutorFromExecutorPool(RemoveExecutorFromExecutorPoolCommand command);
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/service/AddNewExecutorToExecutorPoolService.java

@@ -0,0 +1,25 @@
+package ch.unisg.executorpool.application.service;
+
+import ch.unisg.executorpool.application.port.in.AddNewExecutorToExecutorPoolUseCase;
+import ch.unisg.executorpool.application.port.in.AddNewExecutorToExecutorPoolCommand;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorPool;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+import org.yaml.snakeyaml.constructor.DuplicateKeyException;
+
+import javax.transaction.Transactional;
+import javax.validation.ConstraintViolationException;
+
+@RequiredArgsConstructor
+@Component
+@Transactional
+public class AddNewExecutorToExecutorPoolService implements AddNewExecutorToExecutorPoolUseCase {
+
+    @Override
+    public ExecutorClass addNewExecutorToExecutorPool(AddNewExecutorToExecutorPoolCommand command){
+        ExecutorPool executorPool = ExecutorPool.getExecutorPool();
+
+        return executorPool.addNewExecutor(command.getExecutorIp(), command.getExecutorPort(), command.getExecutorTaskType());
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/service/GetAllExecutorInExecutorPoolByTypeService.java

@@ -0,0 +1,24 @@
+package ch.unisg.executorpool.application.service;
+
+import ch.unisg.executorpool.application.port.in.GetAllExecutorInExecutorPoolByTypeQuery;
+import ch.unisg.executorpool.application.port.in.GetAllExecutorInExecutorPoolByTypeUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorPool;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import javax.transaction.Transactional;
+import java.util.List;
+
+@RequiredArgsConstructor
+@Component
+@Transactional
+public class GetAllExecutorInExecutorPoolByTypeService implements GetAllExecutorInExecutorPoolByTypeUseCase {
+
+    @Override
+    public List<ExecutorClass> getAllExecutorInExecutorPoolByType(GetAllExecutorInExecutorPoolByTypeQuery query){
+        ExecutorPool executorPool = ExecutorPool.getExecutorPool();
+        return executorPool.getAllExecutorsByType(query.getExecutorTaskType());
+    }
+
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/service/GetAllExecutorsInExecutorPoolService.java

@@ -0,0 +1,22 @@
+package ch.unisg.executorpool.application.service;
+
+import ch.unisg.executorpool.application.port.in.GetAllExecutorsInExecutorPoolUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorPool;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import javax.transaction.Transactional;
+import java.util.List;
+
+@RequiredArgsConstructor
+@Component
+@Transactional
+public class GetAllExecutorsInExecutorPoolService implements GetAllExecutorsInExecutorPoolUseCase {
+
+    @Override
+    public List<ExecutorClass> getAllExecutorsInExecutorPool(){
+        ExecutorPool executorPool = ExecutorPool.getExecutorPool();
+        return executorPool.getListOfExecutors().getValue();
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/application/service/RemoveExecutorFromExecutorPoolService.java

@@ -0,0 +1,22 @@
+package ch.unisg.executorpool.application.service;
+
+import ch.unisg.executorpool.application.port.in.RemoveExecutorFromExecutorPoolCommand;
+import ch.unisg.executorpool.application.port.in.RemoveExecutorFromExecutorPoolUseCase;
+import ch.unisg.executorpool.domain.ExecutorClass;
+import ch.unisg.executorpool.domain.ExecutorPool;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Component;
+
+import javax.transaction.Transactional;
+import java.util.Optional;
+
+@RequiredArgsConstructor
+@Component
+@Transactional
+public class RemoveExecutorFromExecutorPoolService implements RemoveExecutorFromExecutorPoolUseCase {
+    @Override
+    public Optional<ExecutorClass> removeExecutorFromExecutorPool(RemoveExecutorFromExecutorPoolCommand command){
+        ExecutorPool executorPool = ExecutorPool.getExecutorPool();
+        return executorPool.removeExecutorByIpAndPort(command.getExecutorIp(), command.getExecutorPort());
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/domain/ExecutorClass.java

@@ -0,0 +1,42 @@
+package ch.unisg.executorpool.domain;
+
+import lombok.Getter;
+import lombok.Value;
+
+public class ExecutorClass {
+
+    @Getter
+    private final ExecutorIp executorIp;
+
+    @Getter
+    private final ExecutorPort executorPort;
+
+    @Getter
+    private final ExecutorTaskType executorTaskType;
+
+    public ExecutorClass(ExecutorIp executorIp, ExecutorPort executorPort, ExecutorTaskType executorTaskType){
+        this.executorIp = executorIp;
+        this.executorPort = executorPort;
+        this.executorTaskType = executorTaskType;
+    }
+
+    protected static ExecutorClass createExecutorClass(ExecutorIp executorIp, ExecutorPort executorPort, ExecutorTaskType executorTaskType){
+        System.out.println("New Task: " + executorIp.getValue() + " " + executorPort.getValue() + " " + executorTaskType.getValue());
+        return new ExecutorClass(executorIp, executorPort, executorTaskType);
+    }
+
+    @Value
+    public static class ExecutorIp {
+        private String value;
+    }
+
+    @Value
+    public static class ExecutorPort {
+        private String value;
+    }
+
+    @Value
+    public static class ExecutorTaskType {
+        private String value;
+    }
+}

executor-pool/src/main/java/ch/unisg/executorpool/domain/ExecutorPool.java

@@ -0,0 +1,74 @@
+package ch.unisg.executorpool.domain;
+
+import lombok.Getter;
+import lombok.Value;
+
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+
+public class ExecutorPool {
+
+    @Getter
+    private final ListOfExecutors listOfExecutors;
+
+    private static final ExecutorPool executorPool = new ExecutorPool();
+
+    private ExecutorPool(){
+        this.listOfExecutors = new ListOfExecutors(new LinkedList<ExecutorClass>());
+    }
+
+    public static ExecutorPool getExecutorPool() { return executorPool; }
+
+    public ExecutorClass addNewExecutor(ExecutorClass.ExecutorIp executorIp, ExecutorClass.ExecutorPort executorPort, ExecutorClass.ExecutorTaskType executorTaskType){
+        ExecutorClass newExecutor = ExecutorClass.createExecutorClass(executorIp, executorPort, executorTaskType);
+        listOfExecutors.value.add(newExecutor);
+        System.out.println("Number of executors: " + listOfExecutors.value.size());
+        return newExecutor;
+    }
+
+    public Optional<ExecutorClass> getExecutorByIpAndPort(ExecutorClass.ExecutorIp executorIp, ExecutorClass.ExecutorPort executorPort){
+
+        for (ExecutorClass executor : listOfExecutors.value ) {
+            // TODO can this be simplified by overwriting equals()?
+            if(executor.getExecutorIp().getValue().equalsIgnoreCase(executorIp.getValue()) &&
+                    executor.getExecutorPort().getValue().equalsIgnoreCase(executorPort.getValue())){
+                return Optional.of(executor);
+            }
+        }
+
+        return Optional.empty();
+    }
+
+    public List<ExecutorClass> getAllExecutorsByType(ExecutorClass.ExecutorTaskType executorTaskType){
+
+        List<ExecutorClass> matchedExecutors = new LinkedList<ExecutorClass>();
+
+        for (ExecutorClass executor : listOfExecutors.value ) {
+            // TODO can this be simplified by overwriting equals()?
+            if(executor.getExecutorTaskType().getValue().equalsIgnoreCase(executorTaskType.getValue())){
+                matchedExecutors.add(executor);
+            }
+        }
+
+        return matchedExecutors;
+    }
+
+    public Optional<ExecutorClass> removeExecutorByIpAndPort(ExecutorClass.ExecutorIp executorIp, ExecutorClass.ExecutorPort executorPort){
+        for (ExecutorClass executor : listOfExecutors.value ) {
+            // TODO can this be simplified by overwriting equals()?
+            if(executor.getExecutorIp().getValue().equalsIgnoreCase(executorIp.getValue()) &&
+                    executor.getExecutorPort().getValue().equalsIgnoreCase(executorPort.getValue())){
+                listOfExecutors.value.remove(executor);
+                return Optional.of(executor);
+            }
+        }
+
+        return Optional.empty();
+    }
+
+    @Value
+    public static class ListOfExecutors {
+        private List<ExecutorClass> value;
+    }
+}

tapas-tasks/src/main/java/ch/unisg/tapastasks/tasks/application/service/AddNewTaskToTaskListService.java

@@ -31,6 +31,7 @@ public class AddNewTaskToTaskListService implements AddNewTaskToTaskListUseCase
         if (newTask != null) {
             NewTaskAddedEvent newTaskAdded = new NewTaskAddedEvent(newTask.getTaskName().getValue(),
                     taskList.getTaskListName().getValue());
+
             newTaskAddedEventPort.publishNewTaskAddedEvent(newTaskAdded);
         }