Improve Tickable interface

src/main/java/net/minestom/server/Tickable.java

@@ -1,7 +1,54 @@
 package net.minestom.server;
 
+import net.minestom.server.utils.time.UpdateOption;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+
+/**
+ * Represents an element which is ticked at a regular interval.
+ * <p>
+ * Each tickable element can also be a container for multiple elements using {@link #getTickableElements()}.
+ */
 public interface Tickable {
 
+    /**
+     * Ticks this element if {@link #getTickRate()} allows it.
+     * <p>
+     * Will execute this same method for every elements inside {@link #getTickableElements()}.
+     *
+     * @param time the time of the tick in milliseconds
+     */
     void tick(long time);
 
+    /**
+     * Gets all the tickable elements linked to this.
+     *
+     * @return a modifiable {@link Collection} containing the linked tickable elements
+     */
+    @NotNull
+    Collection<Tickable> getTickableElements();
+
+    /**
+     * Gets the current tick rate of this element
+     *
+     * @return the current tick rate
+     */
+    @NotNull
+    UpdateOption getTickRate();
+
+    /**
+     * Changes the tick rate of this element.
+     *
+     * @param updateOption the new tick rate
+     */
+    void setTickRate(@NotNull UpdateOption updateOption);
+
+    /**
+     * Gets the last time this element has been ticked.
+     *
+     * @return the last tick time in milliseconds
+     */
+    long getLastTickTime();
+
 }