Implemented base of EventEmitters

lib/Connections/Connection.js

@@ -174,6 +174,21 @@ class Connection extends PartialConnection {
         .all().map(Row => Row.Key);
     }
 
+    /**
+     * 
+     * @param {String} Event String to represent which event you're applying to the function.
+     * @param {Function} Fn Function to execute when this event triggers.
+     * @returns {Boolean} Whether this event was registered.
+     */
+    On (Event, Fn) {
+        if (typeof Fn !== "function")  return false;
+        if (typeof Event !== "string") return false;
+        if (!["Set", "Fetch", "Erase"].includes(Event)) return false;
+
+        this._EventHandler.on(Event, Fn);
+        return true;
+    }
+
     /**
      * Disconnects from this Connection, clears in-memory rows.
      * Only run this method when you are exiting the program,
@@ -327,6 +342,8 @@ class Connection extends PartialConnection {
         this.API.prepare(`INSERT OR REPLACE INTO '${this.Table}' ('Key', 'Val') VALUES (?, ?);`)
         .run(Key, JSON.stringify(Value));
 
+        this._EventEmmitter.emit("Set", {KeyOrPath, Key, Path}, Value);
+
         return this;
     }
 
@@ -353,6 +370,8 @@ class Connection extends PartialConnection {
         if (typeof Path !== "undefined") Fecthed = this._CastPath(Fetched, Path);
         if (typeof Fetched === "object") delete Fetched._Timestamp;
 
+        this._EventEmmitter.emit("Fetch", {KeyOrPath, Key, Path}, Fetched, Cache);
+
         return Fetched;
     }
 
@@ -380,6 +399,7 @@ class Connection extends PartialConnection {
         if (this._Ready && Keys.length) {
             for (const Key of Keys)
             this.API.prepare(`DELETE FROM '${this.Table}' WHERE Key = ?;`).run(Key);
+            this._EventEmmitter.emit("Set", Keys);
             this.Evict(...Keys);
         }