diff --git a/doric/context.cpp b/doric/context.cpp
new file mode 100644
index 00000000..c12b3788
--- /dev/null
+++ b/doric/context.cpp
@@ -0,0 +1,39 @@
+#include <QJsonObject>
+#include <QJsonDocument>
+
+#include "constant.h"
+#include "context.h"
+#include "driver/native_driver.h"
+
+Context::Context(int contextId, QString *source) {
+    this->driver = NativeDriver::getInstance();
+
+    this->contextId = contextId;
+    this->source = source;
+}
+
+void Context::show() {
+    QString *method = new QString(Constant::DORIC_ENTITY_SHOW);
+    QVector<QString*> *arguments = new QVector<QString*>();
+
+    driver->invokeContextEntityMethod(contextId, method, nullptr);
+
+    delete arguments;
+    delete method;
+}
+
+void Context::init(double width, double height) {
+    QJsonObject *jsonObject = new QJsonObject();
+    jsonObject->insert("width", width);
+    jsonObject->insert("height", height);
+
+    QString *method = new QString(Constant::DORIC_ENTITY_INIT);
+    QVariant *variant = new QVariant();
+    variant->setValue(*jsonObject);
+
+    driver->invokeContextEntityMethod(contextId, method, variant, nullptr);
+
+    delete variant;
+    delete method;
+    delete jsonObject;
+}
diff --git a/doric/context.h b/doric/context.h
index 941d10de..727b248a 100644
--- a/doric/context.h
+++ b/doric/context.h
@@ -2,12 +2,8 @@
 #define CONTEXT_H
 
 #include <QString>
-#include <QJsonObject>
-#include <QJsonDocument>
 
-#include "constant.h"
 #include "driver/driver.h"
-#include "driver/native_driver.h"
 
 class Context
 {
@@ -17,38 +13,13 @@ private:
     QString *source;
 
 public:
-    Driver *driver = NativeDriver::getInstance();
+    Driver *driver;
 
-    Context(int contextId, QString *source) {
-        this->contextId = contextId;
-        this->source = source;
-    }
+    Context(int contextId, QString *source);
 
-    void show() {
-        QString *method = new QString(Constant::DORIC_ENTITY_SHOW);
-        QVector<QString*> *arguments = new QVector<QString*>();
+    void show();
 
-        driver->invokeContextEntityMethod(contextId, method, nullptr);
-
-        delete arguments;
-        delete method;
-    }
-
-    void init(double width, double height) {
-        QJsonObject *jsonObject = new QJsonObject();
-        jsonObject->insert("width", width);
-        jsonObject->insert("height", height);
-
-        QString *method = new QString(Constant::DORIC_ENTITY_INIT);
-        QVariant *variant = new QVariant();
-        variant->setValue(*jsonObject);
-
-        driver->invokeContextEntityMethod(contextId, method, variant, nullptr);
-
-        delete variant;
-        delete method;
-        delete jsonObject;
-    }
+    void init(double width, double height);
 };
 
 #endif // CONTEXT_H
diff --git a/doric/doric.pro b/doric/doric.pro
index 379ad3b3..7840e88f 100644
--- a/doric/doric.pro
+++ b/doric/doric.pro
@@ -15,9 +15,15 @@ DEFINES += QT_DEPRECATED_WARNINGS
 
 SOURCES += \
         constant.cpp \
+        context.cpp \
         driver/native_driver.cpp \
+        engine/js_engine.cpp \
         main.cpp \
-        native/native_bridge.cpp
+        native/native_bridge.cpp \
+        native/native_empty.cpp \
+        native/native_log.cpp \
+        native/native_timer.cpp \
+        registry.cpp
 
 RESOURCES += qml.qrc
 
diff --git a/doric/driver/native_driver.cpp b/doric/driver/native_driver.cpp
index 6216f24a..5a524228 100644
--- a/doric/driver/native_driver.cpp
+++ b/doric/driver/native_driver.cpp
@@ -3,6 +3,10 @@
 #include "native_driver.h"
 #include "utility/utility.h"
 
+NativeDriver::NativeDriver() {
+    qDebug() << "NativeDriver constructor";
+}
+
 NativeDriver::~NativeDriver() {
     qDebug() << "NativeDriver destructor";
 }
diff --git a/doric/driver/native_driver.h b/doric/driver/native_driver.h
index 2fc17667..9535f690 100644
--- a/doric/driver/native_driver.h
+++ b/doric/driver/native_driver.h
@@ -11,9 +11,7 @@ class NativeDriver : public Driver {
 
 private:
     static NativeDriver *local_instance;
-    NativeDriver() {
-        qDebug() << "NativeDriver constructor";
-    }
+    NativeDriver();
 
     ~NativeDriver() override;
 
diff --git a/doric/engine/js_engine.cpp b/doric/engine/js_engine.cpp
new file mode 100644
index 00000000..97dd6d1e
--- /dev/null
+++ b/doric/engine/js_engine.cpp
@@ -0,0 +1,80 @@
+#include <QFile>
+#include <QResource>
+
+#include "constant.h"
+#include "js_engine.h"
+
+JSEngine::JSEngine() {
+    initJSEngine();
+    injectGlobal();
+    initDoricRuntime();
+}
+
+void JSEngine::prepareContext(int contextId, QString *script) {
+    QString contextIdString = QString::number(contextId);
+    QString source = QString(Constant::TEMPLATE_CONTEXT_CREATE)
+            .replace("%s1", *script)
+            .replace("%s2", contextIdString)
+            .replace("%s3", contextIdString)
+            .replace("%s4", contextIdString);
+    QJSValue result = engine->evaluate(source, "context://" + contextIdString);
+    qDebug() << "context://" + contextIdString + " result: " + result.toString();
+}
+
+void JSEngine::destroyContext(int contextId) {
+    QString contextIdString = QString::number(contextId);
+    QString source = QString(Constant::TEMPLATE_CONTEXT_DESTROY)
+            .replace("%s", contextIdString);
+    QJSValue result = engine->evaluate(source, "_context://" + contextIdString);
+    qDebug() << "context://" + contextIdString + " result: " + result.toString();
+}
+
+void JSEngine::initJSEngine() {
+    engine->installExtensions(QJSEngine::AllExtensions);
+}
+
+void JSEngine::injectGlobal() {
+    QJSValue log = engine->newQObject(nativeLog);
+    engine->globalObject().setProperty(Constant::INJECT_LOG, log.property("function"));
+
+    QJSValue timer = engine->newQObject(nativeTimer);
+    engine->globalObject().setProperty(Constant::INJECT_TIMER_SET, timer.property("setTimer"));
+    engine->globalObject().setProperty(Constant::INJECT_TIMER_CLEAR, timer.property("clearTimer"));
+
+    QJSValue empty = engine->newQObject(nativeEmpty);
+    engine->globalObject().setProperty(Constant::INJECT_EMPTY, empty.property("function"));
+
+    QJSValue bridge = engine->newQObject(nativeBridge);
+    engine->globalObject().setProperty(Constant::INJECT_BRIDGE, bridge.property("function"));
+}
+
+void JSEngine::initDoricRuntime() {
+    {
+        QResource resource(":/doric/doric-sandbox.js");
+        QFile *file = new QFile(resource.fileName());
+        file->open(QFile::ReadOnly | QFile::Text);
+        QTextStream in(file);
+        QString script = in.readAll();
+        file->close();
+        delete file;
+
+        QJSValue result = engine->evaluate(script, "doric-sandbox.js");
+        qDebug() << "doric-sandbox.js result: " + result.toString();
+    }
+
+    {
+        QResource resource(":/doric/doric-lib.js");
+        QFile *file = new QFile(resource.fileName());
+        file->open(QFile::ReadOnly | QFile::Text);
+        QTextStream in(file);
+        QString script = in.readAll();
+        file->close();
+        delete file;
+
+        QString lib = QString(Constant::TEMPLATE_MODULE)
+                .replace("%s1", "doric")
+                .replace("%s2", script);
+        QJSValue result = engine->evaluate(lib, "doric-lib.js");
+        qDebug() << "doric-lib.js result: " + result.toString();
+    }
+}
diff --git a/doric/engine/js_engine.h b/doric/engine/js_engine.h
index 5a011b88..66fa65c1 100644
--- a/doric/engine/js_engine.h
+++ b/doric/engine/js_engine.h
@@ -1,47 +1,23 @@
 #ifndef JS_ENGINE_H
 #define JS_ENGINE_H
 
-#include <QFile>
 #include <QJSEngine>
-#include <QObject>
-#include <QResource>
 
-#include "constant.h"
 #include "native/native_bridge.h"
 #include "native/native_empty.h"
 #include "native/native_log.h"
 #include "native/native_timer.h"
 
-class JSEngine : public QObject {
-    Q_OBJECT
+class JSEngine {
 
 public:
     QJSEngine *engine = new QJSEngine();
 
-    JSEngine(QObject *parent = nullptr) : QObject(parent) {
-        initJSEngine();
-        injectGlobal();
-        initDoricRuntime();
-    }
+    JSEngine();
 
-    void prepareContext(int contextId, QString *script) {
-        QString contextIdString = QString::number(contextId);
-        QString source = QString(Constant::TEMPLATE_CONTEXT_CREATE)
-                .replace("%s1", *script)
-                .replace("%s2", contextIdString)
-                .replace("%s3", contextIdString)
-                .replace("%s4", contextIdString);
-        QJSValue result = engine->evaluate(source, "context://" + contextIdString);
-        qDebug() << "context://" + contextIdString + " result: " + result.toString();
-    }
+    void prepareContext(int contextId, QString *script);
 
-    void destroyContext(int contextId) {
-        QString contextIdString = QString::number(contextId);
-        QString source = QString(Constant::TEMPLATE_CONTEXT_DESTROY)
-                .replace("%s", contextIdString);
-        QJSValue result = engine->evaluate(source, "_context://" + contextIdString);
-        qDebug() << "context://" + contextIdString + " result: " + result.toString();
-    }
+    void destroyContext(int contextId);
 
 private:
     NativeLog *nativeLog = new NativeLog();
@@ -49,55 +25,11 @@ private:
     NativeEmpty *nativeEmpty = new NativeEmpty();
     NativeBridge *nativeBridge = new NativeBridge();
 
-    void initJSEngine() {
-        engine->installExtensions(QJSEngine::AllExtensions);
-    }
+    void initJSEngine();
 
-    void injectGlobal() {
-        QJSValue log = engine->newQObject(nativeLog);
-        engine->globalObject().setProperty(Constant::INJECT_LOG, log.property("function"));
+    void injectGlobal();
 
-        QJSValue timer = engine->newQObject(nativeTimer);
-        engine->globalObject().setProperty(Constant::INJECT_TIMER_SET, timer.property("setTimer"));
-        engine->globalObject().setProperty(Constant::INJECT_TIMER_CLEAR, timer.property("clearTimer"));
-
-        QJSValue empty = engine->newQObject(nativeEmpty);
-        engine->globalObject().setProperty(Constant::INJECT_EMPTY, empty.property("function"));
-
-        QJSValue bridge = engine->newQObject(nativeBridge);
-        engine->globalObject().setProperty(Constant::INJECT_BRIDGE, bridge.property("function"));
-    }
-
-    void initDoricRuntime() {
-        {
-            QResource resource(":/doric/doric-sandbox.js");
-            QFile *file = new QFile(resource.fileName());
-            file->open(QFile::ReadOnly | QFile::Text);
-            QTextStream in(file);
-            QString script = in.readAll();
-            file->close();
-            delete file;
-
-            QJSValue result = engine->evaluate(script, "doric-sandbox.js");
-            qDebug() << "doric-sandbox.js result: " + result.toString();
-        }
-
-        {
-            QResource resource(":/doric/doric-lib.js");
-            QFile *file = new QFile(resource.fileName());
-            file->open(QFile::ReadOnly | QFile::Text);
-            QTextStream in(file);
-            QString script = in.readAll();
-            file->close();
-            delete file;
-
-            QString lib = QString(Constant::TEMPLATE_MODULE)
-                    .replace("%s1", "doric")
-                    .replace("%s2", script);
-            QJSValue result = engine->evaluate(lib, "doric-lib.js");
-            qDebug() << "doric-lib.js result: " + result.toString();
-        }
-    }
+    void initDoricRuntime();
 };
 
 #endif // JS_ENGINE_H
diff --git a/doric/main.cpp b/doric/main.cpp
index 377c3e08..fed8dade 100644
--- a/doric/main.cpp
+++ b/doric/main.cpp
@@ -1,6 +1,7 @@
 #include <QFile>
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
+#include <QResource>
 #include <QTextStream>
 
 #include "context_manager.h"
diff --git a/doric/native/native_bridge.h b/doric/native/native_bridge.h
index 7783e38c..a274e1f7 100644
--- a/doric/native/native_bridge.h
+++ b/doric/native/native_bridge.h
@@ -1,7 +1,6 @@
 #ifndef NATIVE_BRIDGE_H
 #define NATIVE_BRIDGE_H
 
-#include <QDebug>
 #include <QJSValue>
 #include <QObject>
 
diff --git a/doric/native/native_empty.cpp b/doric/native/native_empty.cpp
new file mode 100644
index 00000000..fc60bc1a
--- /dev/null
+++ b/doric/native/native_empty.cpp
@@ -0,0 +1,7 @@
+#include <QDebug>
+
+#include "native_empty.h"
+
+void NativeEmpty::function() {
+    qDebug() << "nativeEmpty";
+}
diff --git a/doric/native/native_empty.h b/doric/native/native_empty.h
index 14340137..64135411 100644
--- a/doric/native/native_empty.h
+++ b/doric/native/native_empty.h
@@ -2,7 +2,6 @@
 #define NATIVE_EMPTY_H
 
 #include <QObject>
-#include <QDebug>
 
 class NativeEmpty : public QObject {
     Q_OBJECT
@@ -10,9 +9,7 @@ class NativeEmpty : public QObject {
 public:
     NativeEmpty(QObject *parent = nullptr) : QObject(parent) {}
 
-    Q_INVOKABLE void function() {
-        qDebug() << "nativeEmpty";
-    }
+    Q_INVOKABLE void function();
 };
 
 #endif // NATIVE_EMPTY_H
diff --git a/doric/native/native_log.cpp b/doric/native/native_log.cpp
new file mode 100644
index 00000000..70e7bb72
--- /dev/null
+++ b/doric/native/native_log.cpp
@@ -0,0 +1,13 @@
+#include <QDebug>
+
+#include "native_log.h"
+
+void NativeLog::function(QString level, QString content) {
+    if (level == 'w') {
+        qWarning() << content;
+    } else if (level == 'd') {
+        qDebug() << content;
+    } else if (level == 'e') {
+        qCritical() << content;
+    }
+}
diff --git a/doric/native/native_log.h b/doric/native/native_log.h
index f2caf7f1..1649496b 100644
--- a/doric/native/native_log.h
+++ b/doric/native/native_log.h
@@ -2,7 +2,6 @@
 #define NATIVELOG_H
 
 #include <QObject>
-#include <QDebug>
 
 class NativeLog : public QObject {
     Q_OBJECT
@@ -10,15 +9,7 @@ class NativeLog : public QObject {
 public:
     NativeLog(QObject *parent = nullptr) : QObject(parent) {}
 
-    Q_INVOKABLE void function(QString level, QString content) {
-        if (level == 'w') {
-            qWarning() << content;
-        } else if (level == 'd') {
-            qDebug() << content;
-        } else if (level == 'e') {
-            qCritical() << content;
-        }
-    }
+    Q_INVOKABLE void function(QString level, QString content);
 };
 
 #endif // NATIVELOG_H
diff --git a/doric/native/native_timer.cpp b/doric/native/native_timer.cpp
new file mode 100644
index 00000000..2e4ec14d
--- /dev/null
+++ b/doric/native/native_timer.cpp
@@ -0,0 +1,30 @@
+#include <QTimer>
+
+#include "native_timer.h"
+
+void NativeTimer::setTimer(long timerId, int time, bool repeat) {
+    QTimer *timer = new QTimer(this);
+    timer->setSingleShot(!repeat);
+    connect(timer, &QTimer::timeout, this, [=] () {
+        if (deletedTimerIds->contains(timerId)) {
+            deletedTimerIds->remove(timerId);
+            delete timer;
+        } else {
+            engine->evaluate(
+                        Constant::GLOBAL_DORIC + "." +
+                        Constant::DORIC_TIMER_CALLBACK + "(" +
+                        QString::number(timerId) + ")"
+                        );
+
+            if (!repeat) {
+                deletedTimerIds->remove(timerId);
+                delete timer;
+            }
+        }
+    });
+    timer->start(time);
+}
+
+void NativeTimer::clearTimer(long timerId) {
+    deletedTimerIds->insert(timerId);
+}
diff --git a/doric/native/native_timer.h b/doric/native/native_timer.h
index 89575af5..6cb4eff9 100644
--- a/doric/native/native_timer.h
+++ b/doric/native/native_timer.h
@@ -4,7 +4,6 @@
 #include <QJSEngine>
 #include <QObject>
 #include <QSet>
-#include <QTimer>
 
 #include "constant.h"
 
@@ -20,32 +19,9 @@ public:
         this->engine = engine;
     }
 
-    Q_INVOKABLE void setTimer(long timerId, int time, bool repeat) {
-        QTimer *timer = new QTimer(this);
-        timer->setSingleShot(!repeat);
-        connect(timer, &QTimer::timeout, this, [=] () {
-            if (deletedTimerIds->contains(timerId)) {
-                deletedTimerIds->remove(timerId);
-                delete timer;
-            } else {
-                engine->evaluate(
-                            Constant::GLOBAL_DORIC + "." +
-                            Constant::DORIC_TIMER_CALLBACK + "(" +
-                            QString::number(timerId) + ")"
-                            );
+    Q_INVOKABLE void setTimer(long timerId, int time, bool repeat);
 
-                if (!repeat) {
-                    deletedTimerIds->remove(timerId);
-                    delete timer;
-                }
-            }
-        });
-        timer->start(time);
-    }
-
-    Q_INVOKABLE void clearTimer(long timerId) {
-        deletedTimerIds->insert(timerId);
-    }
+    Q_INVOKABLE void clearTimer(long timerId);
 
 };
 #endif // NATIVE_TIMER_H
diff --git a/doric/registry.cpp b/doric/registry.cpp
new file mode 100644
index 00000000..b4e6e79a
--- /dev/null
+++ b/doric/registry.cpp
@@ -0,0 +1,11 @@
+#include <QDebug>
+
+#include "registry.h"
+
+Registry::Registry() {
+    registerNativePlugin(typeid(ShaderPlugin).name());
+}
+
+void Registry::registerNativePlugin(QString name) {
+    qDebug() << name;
+}
diff --git a/doric/registry.h b/doric/registry.h
index 9b7cd2ad..30ddc9a6 100644
--- a/doric/registry.h
+++ b/doric/registry.h
@@ -12,13 +12,9 @@ private:
     QMap<QString, QString> pluginInfoMap;
 
 public:
-    Registry() {
-        registerNativePlugin(typeid(ShaderPlugin).name());
-    }
+    Registry();
 
-    void registerNativePlugin(QString name) {
-        qDebug() << name;
-    }
+    void registerNativePlugin(QString name);
 };
 
 #endif // REGISTRY_H