Tasks/src/main/java/fr/altarik/toolbox/task/sync/OneTimeSyncTask.java

@@ -0,0 +1,53 @@
+package fr.altarik.toolbox.task.sync;
+
+import fr.altarik.toolbox.task.AltarikRunnable;
+import fr.altarik.toolbox.task.SchedulerTaskData;
+import fr.altarik.toolbox.task.TaskI;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class OneTimeSyncTask implements TaskI, Runnable {
+
+    private final ServerTickListener listener;
+    private final List<SchedulerTaskData> tasks;
+
+    private OneTimeSyncTask() {
+        this.listener = new ServerTickListener(this);
+        this.tasks = new ArrayList<>(2);
+    }
+
+    public static TaskI initialize() {
+        return new OneTimeSyncTask();
+    }
+
+    @Override
+    public void addTask(AltarikRunnable function) {
+        addTask(function, 0);
+    }
+
+    public void addTask(AltarikRunnable function, int delay) {
+        tasks.add(new SchedulerTaskData(function, delay, 0));
+    }
+
+    @Override
+    public void run() {
+        List<SchedulerTaskData> removeList = new ArrayList<>(tasks.size());
+        for(SchedulerTaskData data : tasks) {
+            if(!data.getFunction().isCancelled()) {
+                long currentDelay = data.getCurrentDelay();
+                if(currentDelay != 0) {
+                    data.setCurrentDelay(currentDelay - 1);
+                } else {
+                    data.getFunction().run();
+                    removeList.add(data);
+                }
+            } else {
+                removeList.add(data);
+            }
+        }
+        for(SchedulerTaskData toRemove : removeList) {
+            tasks.remove(toRemove);
+        }
+    }
+}

Tasks/src/main/java/fr/altarik/toolbox/task/sync/PeriodicSyncTask.java

@@ -9,8 +9,8 @@ import java.util.List;
 
 public class PeriodicSyncTask implements PeriodicTaskI, Runnable {
 
-    private ServerTickListener listener;
+    private final ServerTickListener listener;
-    private List<SchedulerTaskData> tasks;
+    private final List<SchedulerTaskData> tasks;
 
     private PeriodicSyncTask() {
         this.listener = new ServerTickListener(this);

Tasks/src/main/java/fr/altarik/toolbox/task/sync/ServerTickListener.java

@@ -5,9 +5,9 @@ import net.minecraft.server.MinecraftServer;
 
 public class ServerTickListener {
 
-    private final PeriodicSyncTask task;
+    private final Runnable task;
 
-    public ServerTickListener(PeriodicSyncTask syncTask) {
+    public ServerTickListener(Runnable syncTask) {
         this.task = syncTask;
         ServerTickEvents.START_SERVER_TICK.register(this::onServerTick);
     }

Tasks/src/test/java/fr/altarik/toolbox/task/sync/OneTimeSyncTaskTest.java

@@ -0,0 +1,25 @@
+package fr.altarik.toolbox.task.sync;
+
+import fr.altarik.toolbox.task.AltarikRunnable;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class OneTimeSyncTaskTest {
+
+    @Test
+    void testOneTimeTask() {
+        OneTimeSyncTask worker = (OneTimeSyncTask) OneTimeSyncTask.initialize();
+        List<AtomicInteger> results = new ArrayList<>();
+        AtomicInteger value1 = new AtomicInteger(1);
+        AtomicInteger value2 = new AtomicInteger(2);
+        worker.addTask(new AltarikRunnable() {
+            @Override
+            public void run() {
+                results.add(value1);
+            }
+        });
+    }
+}