diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..857c250
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,13 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "dart_framework",
+            "request": "launch",
+            "type": "dart"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/bin/main.dart b/bin/main.dart
new file mode 100644
index 0000000..abdf3a3
--- /dev/null
+++ b/bin/main.dart
@@ -0,0 +1,34 @@
+import 'package:dart_framework/core/isolate_manager.dart';
+import 'package:dart_framework/core/log.dart';
+
+Future<void> main() async {
+  log('test');
+  log('test2');
+
+  test();
+}
+
+void test() async {
+  await Future.delayed(const Duration(seconds: 1));
+  log('this is test1');
+  log('this is test2');
+
+  await Future.delayed(const Duration(seconds: 2));
+  log('this is test3');
+  log('this is test4');
+  log('this is test5');
+
+  await Future.delayed(const Duration(seconds: 2));
+  log('this is test6');
+  log('this is test7');
+
+  await Future.delayed(const Duration(seconds: 1));
+  log('this is test8');
+  log('this is test9');
+
+  await Future.delayed(const Duration(seconds: 3));
+  log('this is test10');
+  log('this is test11');
+  log('this is test12');
+  log('this is test13');
+}
diff --git a/json_01.json b/json_01.json
new file mode 100644
index 0000000..9adc145
--- /dev/null
+++ b/json_01.json
@@ -0,0 +1,3 @@
+{
+    "a": "foo"
+}
\ No newline at end of file
diff --git a/json_02.json b/json_02.json
new file mode 100644
index 0000000..b816dc9
--- /dev/null
+++ b/json_02.json
@@ -0,0 +1,4 @@
+{
+    "a": "foo",
+    "b": "bar"
+}
\ No newline at end of file
diff --git a/json_03.json b/json_03.json
new file mode 100644
index 0000000..8109f49
--- /dev/null
+++ b/json_03.json
@@ -0,0 +1,5 @@
+{
+    "a": "foo",
+    "b": "bar",
+    "c": "bar"
+}
\ No newline at end of file
diff --git a/lib/core/isolate_manager.dart b/lib/core/isolate_manager.dart
new file mode 100644
index 0000000..c25fc39
--- /dev/null
+++ b/lib/core/isolate_manager.dart
@@ -0,0 +1,253 @@
+import 'dart:mirrors';
+import 'dart:isolate';
+import 'dart:async';
+
+/// ********************** Test ************************* ///
+void test() {
+  IsolateManager.create<IsolateTemplate>((isoEvent, data) async {
+    if (isoEvent == IsolateEvent.ready) {
+      int id = data as int;
+      IsolateManager.sendBroadcast(IsoMessege('test1'));
+      await Future.delayed(Duration(seconds: 2));
+      IsolateManager.send(id, IsoMessege('test2'));
+      IsolateManager.send(id, IsoMessege('test1'));
+      IsolateManager.exit(id);
+    } else if (isoEvent == IsolateEvent.exit) {
+      print('Isolate is exited.');
+    }
+    print('On Event from Isolate: ${isoEvent.name}');
+  }, (message) {
+    print('On Message from Isolate: ${message.type}');
+  });
+}
+
+class IsolateTemplate extends IsolateBase {
+  @override
+  void onReady() async {
+    print('[IsolateTemplate] onReady');
+    addEventListener('test1', onTest1Handler, executeOnce: true);
+    addEventListener('test2', onTest2Handler);
+  }
+
+  void onTest1Handler(Object? data) {
+    print('[IsolateTemplate] OnTest1Handler: $data');
+  }
+
+  void onTest2Handler(Object? data) {
+    print('[IsolateTemplate] OnTest2Handler: $data');
+  }
+}
+
+/// ********************** Define *********************** ///
+enum IsolateEvent { ready, exit }
+
+class IsoMessege {
+  late String type;
+  late Object? message;
+  IsoMessege(this.type, {this.message});
+}
+
+class _IsolateInnerEvent {
+  static const String ready = '_IsolateInnerEvent.Ready';
+  static const String exit = '_IsolateInnerEvent.Exit';
+}
+
+class _IsolateConstructData {
+  late int id;
+  late SendPort mainIsoSender;
+  _IsolateConstructData(this.id, this.mainIsoSender);
+}
+
+class IsolateManager {
+  IsolateManager._privateConstructor();
+  static final IsolateManager _instance = IsolateManager._privateConstructor();
+  static IsolateManager get to => _instance;
+
+  int _nonce = 0;
+  int get nonce {
+    if (_nonce == double.maxFinite.toInt()) {
+      _nonce = 0;
+    } else {
+      _nonce++;
+    }
+    return _nonce;
+  }
+
+  final Map<int, IsolateBase> _isoMap = {};
+  final Map<int, Map<String, Function(Object?)>> _innerEventMap = {};
+
+  static void create<T extends IsolateBase>(
+      Function(IsolateEvent, Object?) isolateEventListener,
+      Function(IsoMessege) messageListener) async {
+    to._create<T>(isolateEventListener, messageListener);
+  }
+
+  void _create<T extends IsolateBase>(
+      Function(IsolateEvent, Object?) isolateEventListener,
+      Function(IsoMessege) messageListener) async {
+    final isoListener = ReceivePort();
+    var id = nonce;
+    T inst = Activator.createInstance(T, {});
+    _isoMap[id] = inst;
+    _addInnerEvent(id, _IsolateInnerEvent.ready, (message) {
+      inst.isoListener = message as SendPort;
+      isolateEventListener(IsolateEvent.ready, id);
+    });
+    await Isolate.spawn(
+        inst.initialize, _IsolateConstructData(id, isoListener.sendPort));
+    await for (IsoMessege message in isoListener) {
+      if (message.type == _IsolateInnerEvent.exit) {
+        isolateEventListener(IsolateEvent.exit, null);
+        break;
+      } else if (_filterInnerEvent(id, message)) {
+        messageListener(message);
+      }
+    }
+    isoListener.close();
+    _isoMap.remove(id);
+  }
+
+  void _addInnerEvent(int id, String type, Function(Object?) listener) {
+    Map<String, Function(Object?)>? eventMap;
+    if (!_innerEventMap.containsKey(id)) {
+      eventMap = {};
+      _innerEventMap[id] = eventMap;
+    }
+    eventMap![type] = listener;
+  }
+
+  bool _filterInnerEvent(int id, IsoMessege message) {
+    var isNotExist = true;
+    if (_innerEventMap.containsKey(id) &&
+        _innerEventMap[id]!.containsKey(message.type)) {
+      isNotExist = false;
+      _innerEventMap[id]![message.type]!(message.message);
+    }
+    return isNotExist;
+  }
+
+  static void sendBroadcast(IsoMessege message) {
+    var entries = to._isoMap.entries;
+    for (var entry in entries) {
+      entry.value.insertEvent(message);
+    }
+  }
+
+  static void send(int id, IsoMessege message) {
+    var map = to._isoMap;
+    if (map.containsKey(id)) {
+      map[id]?.insertEvent(message);
+    }
+  }
+
+  static void exit(int id) {
+    var map = to._isoMap;
+    if (map.containsKey(id)) {
+      map[id]!.insertEvent(IsoMessege(_IsolateInnerEvent.exit));
+    }
+  }
+}
+
+class _IsolateEventListener {
+  late bool executeOnce;
+  late Function(Object?) listener;
+  _IsolateEventListener(this.listener, this.executeOnce);
+}
+
+class IsolateBase {
+  late int id;
+  late ReceivePort _mainIsoListener;
+  late SendPort _mainIsoSender;
+  late SendPort isoListener;
+  final Map<String, List<_IsolateEventListener>> _eventMap = {};
+  final List<_IsolateEventListener> _removeList = [];
+
+  // ignore: library_private_types_in_public_api
+  Future<void> initialize(_IsolateConstructData initData) async {
+    id = initData.id;
+    _mainIsoListener = ReceivePort();
+    _mainIsoSender = initData.mainIsoSender;
+    send(IsoMessege(_IsolateInnerEvent.ready,
+        message: _mainIsoListener.sendPort));
+    onReady();
+    await for (IsoMessege message in _mainIsoListener) {
+      if (message.type == _IsolateInnerEvent.exit) {
+        send(IsoMessege(_IsolateInnerEvent.exit));
+        break;
+      } else {
+        _onEvent(message);
+      }
+    }
+    Isolate.exit(_mainIsoSender);
+  }
+
+  void onReady() async {}
+
+  void send(IsoMessege message) {
+    _mainIsoSender.send(message);
+  }
+
+  void _onEvent(IsoMessege message) {
+    if (_eventMap.containsKey(message.type)) {
+      var list = _eventMap[message.type]!;
+      for (var item in list) {
+        item.listener(message.message);
+        if (item.executeOnce) {
+          _removeList.add(item);
+        }
+      }
+      if (_removeList.isNotEmpty) {
+        for (var item in _removeList) {
+          removeEventListener(message.type, item.listener);
+        }
+        _removeList.clear();
+      }
+    }
+  }
+
+  void addEventListener(String type, Function(Object?) listener,
+      {bool executeOnce = true}) {
+    List<_IsolateEventListener> list;
+    if (_eventMap.containsKey(type)) {
+      list = _eventMap[type]!;
+    } else {
+      list = [];
+      _eventMap[type] = list;
+    }
+    list.add(_IsolateEventListener(listener, executeOnce));
+  }
+
+  void removeEventListener(String type, Function(Object?) listener) {
+    if (_eventMap.containsKey(type)) {
+      var list = _eventMap[type]!;
+      for (int i = 0; i < list.length; ++i) {
+        var item = list[i];
+        if (item.listener == listener) {
+          list.removeAt(i);
+          --i;
+        }
+      }
+    }
+  }
+
+  void insertEvent(IsoMessege message) {
+    isoListener.send(message);
+  }
+}
+
+class Activator {
+  static createInstance(Type type, Map<Symbol, dynamic> namedArguments,
+      [Symbol? constructor, List? arguments]) {
+    constructor ??= const Symbol("");
+    arguments ??= const [];
+
+    var typeMirror = reflectType(type);
+    if (typeMirror is ClassMirror) {
+      return typeMirror
+          .newInstance(constructor, arguments, namedArguments)
+          .reflectee;
+    } else {
+      throw ArgumentError("Cannot create the instance of the type '$type'.");
+    }
+  }
+}
diff --git a/lib/core/log.dart b/lib/core/log.dart
index b3cf971..b184c43 100644
--- a/lib/core/log.dart
+++ b/lib/core/log.dart
@@ -1,4 +1,10 @@
-void log(String message) {}
+import 'package:dart_framework/core/isolate_manager.dart';
+import 'package:dart_framework/io/log_writer_base.dart';
+import 'package:dart_framework/utils/string_util.dart';
+
+void log(String message) {
+  _logSend(message, LogType.verbose);
+}
 
 void logWarning(String message) {
   _logSend(message, LogType.warning);
@@ -21,23 +27,49 @@ class LogItem {
   late LogType type;
 
   LogItem(this.message, this.type) {
-    var now = DateTime.now();
-    date =
-        '${now.year.toString().substring(2, 4)}-${now.month.toString().padLeft(2, '0')}-${now.day.toString().padLeft(2, '0')} '
-        '${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}:${now.second.toString().padLeft(2, '0')}';
+    date = getDates();
+  }
+  @override
+  String toString() {
+    return '[$date][${type.name}] $message';
   }
 }
 
 class Log {
-  Log._privateConstructor();
+  int index = 0;
+  StringBuffer buffer = StringBuffer();
+  Log._privateConstructor() {
+    LogWriterBase.start(_onWriterEvent);
+  }
   static final Log _instance = Log._privateConstructor();
   static Log get to => _instance;
 
   final List<LogItem> logs = [];
 
-  Log();
+  Log() {
+    LogWriterBase.start(_onWriterEvent);
+  }
+
+  void _onWriterEvent(IsoMessege message) {
+    if (message.type == 'request') {
+      if (index != logs.length) {
+        for (int i = logs.length - index - 1; i >= 0; --i) {
+          buffer.writeln(logs[i].toString());
+        }
+        index = logs.length;
+        LogWriterBase.write(buffer.toString());
+        buffer.clear();
+      }
+    }
+  }
 
   void append(LogItem item) {
     logs.insert(0, item);
   }
+
+  void clear() {
+    logs.clear();
+    index = 0;
+    log('Log Restarted.');
+  }
 }
diff --git a/lib/io/file_base.dart b/lib/io/file_base.dart
new file mode 100644
index 0000000..56abb91
--- /dev/null
+++ b/lib/io/file_base.dart
@@ -0,0 +1,10 @@
+import 'package:dart_framework/io/file_io.dart'
+    if (dart.library.html) 'package:dart_framework/io/file_web.dart';
+
+abstract class FileExtendBase {
+  static FileExtendBase get instance {
+    return getInstance();
+  }
+
+  void test();
+}
diff --git a/lib/io/file_io.dart b/lib/io/file_io.dart
new file mode 100644
index 0000000..821437a
--- /dev/null
+++ b/lib/io/file_io.dart
@@ -0,0 +1,13 @@
+import 'dart:io';
+import 'package:dart_framework/io/file_base.dart';
+
+class FileExtend extends FileExtendBase {
+  @override
+  void test() {
+    print('This is ${Platform.operatingSystem}');
+  }
+}
+
+FileExtendBase getInstance() {
+  return FileExtend();
+}
diff --git a/lib/io/file_web.dart b/lib/io/file_web.dart
new file mode 100644
index 0000000..104c053
--- /dev/null
+++ b/lib/io/file_web.dart
@@ -0,0 +1,17 @@
+import 'dart:html';
+import 'package:dart_framework/io/file_base.dart';
+
+class FileExtend extends FileExtendBase {
+  @override
+  void test() {
+    var list = querySelectorAll('div');
+    for (var item in list) {
+      print(item);
+    }
+    print('This is web!!');
+  }
+}
+
+FileExtendBase getInstance() {
+  return FileExtend();
+}
diff --git a/lib/io/log_writer_base.dart b/lib/io/log_writer_base.dart
new file mode 100644
index 0000000..8725778
--- /dev/null
+++ b/lib/io/log_writer_base.dart
@@ -0,0 +1,13 @@
+import 'package:dart_framework/core/isolate_manager.dart';
+import 'package:dart_framework/io/log_writer_io.dart'
+    if (dart.library.html) 'package:dart_framework/io/log_writer_web.dart';
+
+abstract class LogWriterBase extends IsolateBase {
+  static void start(Function(IsoMessege) listener) {
+    startLog(listener);
+  }
+
+  static void write(String log) {
+    print(log);
+  }
+}
diff --git a/lib/io/log_writer_io.dart b/lib/io/log_writer_io.dart
new file mode 100644
index 0000000..6f6405d
--- /dev/null
+++ b/lib/io/log_writer_io.dart
@@ -0,0 +1,27 @@
+import 'dart:io';
+import 'package:dart_framework/core/isolate_manager.dart';
+import 'package:dart_framework/io/log_writer_base.dart';
+
+class LogWriterIO extends LogWriterBase {
+  @override
+  void onReady() {
+    print('[LogWriterIO] onReady');
+    addEventListener('write', write);
+    requester();
+  }
+
+  void requester() async {
+    while (true) {
+      await Future.delayed(const Duration(seconds: 3));
+      send(IsoMessege('request'));
+    }
+  }
+
+  void write(Object? message) {
+    print('write');
+  }
+}
+
+void startLog(Function(IsoMessege) listener) {
+  IsolateManager.create<LogWriterIO>((event, data) {}, listener);
+}
diff --git a/lib/io/log_writer_web.dart b/lib/io/log_writer_web.dart
new file mode 100644
index 0000000..7d64039
--- /dev/null
+++ b/lib/io/log_writer_web.dart
@@ -0,0 +1 @@
+void startLog() {}
diff --git a/lib/test/isolate_test.dart b/lib/test/isolate_test.dart
new file mode 100644
index 0000000..4b106d5
--- /dev/null
+++ b/lib/test/isolate_test.dart
@@ -0,0 +1,28 @@
+// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Read the file, spawn an isolate, send the file contents to the spawned
+// isolate, and wait for the parsed JSON.
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+import 'dart:isolate';
+
+const filename = 'json_01.json';
+
+Future<void> main() async {
+  // Read and parse JSON data in a new isolate,
+  // then store the returned Dart representation.
+  final jsonData = await Isolate.run(() => _readAndParseJson(filename));
+
+  print('Received JSON with ${jsonData.length} keys');
+}
+
+/// Reads the contents of the file with [filename],
+/// decodes the JSON, and returns the result.
+Future<Map<String, dynamic>> _readAndParseJson(String filename) async {
+  final fileData = await File(filename).readAsString();
+  final jsonData = jsonDecode(fileData) as Map<String, dynamic>;
+  return jsonData;
+}
diff --git a/lib/test/test2.dart b/lib/test/test2.dart
new file mode 100644
index 0000000..af33190
--- /dev/null
+++ b/lib/test/test2.dart
@@ -0,0 +1,90 @@
+// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Spawn an isolate, read multiple files, send their contents to the spawned
+// isolate, and wait for the parsed JSON.
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+import 'dart:isolate';
+
+import 'package:async/async.dart';
+
+const filenames = [
+  'json_01.json',
+  'json_02.json',
+  'json_03.json',
+];
+
+void start() async {
+  await for (final jsonData in _sendAndReceive(filenames)) {
+    print('Received JSON with ${jsonData.length} keys');
+  }
+}
+
+// Spawns an isolate and asynchronously sends a list of filenames for it to
+// read and decode. Waits for the response containing the decoded JSON
+// before sending the next.
+//
+// Returns a stream that emits the JSON-decoded contents of each file.
+Stream<Map<String, dynamic>> _sendAndReceive(List<String> filenames) async* {
+  final p = ReceivePort();
+  await Isolate.spawn(_readAndParseJsonService, p.sendPort);
+
+  // Convert the ReceivePort into a StreamQueue to receive messages from the
+  // spawned isolate using a pull-based interface. Events are stored in this
+  // queue until they are accessed by `events.next`.
+  final events = StreamQueue<dynamic>(p);
+
+  // The first message from the spawned isolate is a SendPort. This port is
+  // used to communicate with the spawned isolate.
+  SendPort sendPort = await events.next;
+
+  for (var filename in filenames) {
+    // Send the next filename to be read and parsed
+    sendPort.send(filename);
+
+    // Receive the parsed JSON
+    Map<String, dynamic> message = await events.next;
+
+    // Add the result to the stream returned by this async* function.
+    yield message;
+  }
+
+  // Send a signal to the spawned isolate indicating that it should exit.
+  sendPort.send(null);
+
+  // Dispose the StreamQueue.
+  await events.cancel();
+}
+
+// The entrypoint that runs on the spawned isolate. Receives messages from
+// the main isolate, reads the contents of the file, decodes the JSON, and
+// sends the result back to the main isolate.
+Future<void> _readAndParseJsonService(SendPort p) async {
+  print('Spawned isolate started.');
+
+  // Send a SendPort to the main isolate so that it can send JSON strings to
+  // this isolate.
+  final commandPort = ReceivePort();
+  p.send(commandPort.sendPort);
+
+  // Wait for messages from the main isolate.
+  await for (final message in commandPort) {
+    if (message is String) {
+      // Read and decode the file.
+      final contents = await File(message).readAsString();
+
+      // Send the result to the main isolate.
+      p.send(jsonDecode(contents));
+    } else if (message == null) {
+      // Exit if the main isolate sends a null message, indicating there are no
+      // more files to read and parse.
+      break;
+    }
+  }
+
+  print('Spawned isolate finished.');
+  Isolate.exit();
+}
diff --git a/lib/utils/string_util.dart b/lib/utils/string_util.dart
index 49afeff..cbe9fb2 100644
--- a/lib/utils/string_util.dart
+++ b/lib/utils/string_util.dart
@@ -1,3 +1,17 @@
 String toPascal(String raw) {
   return '${raw[0].toUpperCase()}${raw.substring(1).toLowerCase()}';
 }
+
+String getDates() {
+  return '$getDate() $getTime()';
+}
+
+String getDate() {
+  var now = DateTime.now();
+  return '${now.year.toString().substring(2, 4)}-${now.month.toString().padLeft(2, '0')}-${now.day.toString().padLeft(2, '0')}';
+}
+
+String getTime() {
+  var now = DateTime.now();
+  return '${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}:${now.second.toString().padLeft(2, '0')}';
+}