GroovyShell的初始化过程

GroovyShell的初始化

    public GroovyShell(CompilerConfiguration config) {
        this(new Binding(), config);
    }

	class Binding is subclass of GroovyObjectSupport

	public GroovyObjectSupport() {
        this.metaClass = InvokerHelper.getMetaClass(this.getClass());
    }

	while the InvokerHelper has static members 

	public static final MetaClassRegistry metaRegistry = GroovySystem.getMetaClassRegistry();

	So the GroovySystem will be loaded, and its static members

	static {
        USE_REFLECTION = true;
        META_CLASS_REGISTRY = new MetaClassRegistryImpl();
    }

	public MetaClassRegistryImpl() {
        this(LOAD_DEFAULT, true);
    }

	it will call MetaClassRegistryImpl.registerMethods,
	－> GeneratedMetaMethod.DgmMethodRecord.loadDgmInfo();
	the function will analysis groovy-2.4.0.jar$META-INF/dgminfo
	这是一个二进制流的文件，她定义了很多基本的函数的参数个数，类型，返回值的类型等等
	这个函数最后返回一个列表，记录了所欧的基本函数

	registerMethods(null, true, true, map);返回后， map是一个CachedClass为key （如java.util.Calendar）
		list<MetaMethod>  为value的map 如[[email protected][name: clearTime params: [] returns: class java.util.Calendar owner: class java.util.Calendar],..]

	接着和DefaultGroovyMethods.additionals 合并， 不断填充map
	接着和class org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods 合并 （所有函数为 [
	public static java.lang.StringBuilder org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.leftShift(java.lang.StringBuilder,java.lang.Object), public static java.lang.Object org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.next(java.lang.Enum),
	public static java.lang.String org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.plus(java.lang.StringBuilder,java.lang.String), public static java.lang.Object org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.previous(java.lang.Enum),
	public static void org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.putAt(java.lang.StringBuilder,groovy.lang.EmptyRange,java.lang.Object), public static void org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.putAt(java.lang.StringBuilder,groovy.lang.IntRange,java.lang.Object), public static int org.codehaus.groovy.vmplugin.v5.PluginDefaultGroovyMethods.size(java.lang.StringBuilder)]）

	注意leftShift

	接着DefaultGroovyStaticMethods
	接着     ExtensionModuleScanner scanner = new ExtensionModuleScanner(new DefaultModuleListener(map), this.getClass().getClassLoader());
            scanner.scanClasspathModules();
			从所有META-INF/services/org.codehaus.groovy.runtime.ExtensionModule 中找出properties，
			处理   －－－－－－－－－具体略以后分析
			从 groovy-jsr223-<version>.jar中，找出
			[public static java.lang.Object org.codehaus.groovy.jsr223.ScriptExtensions.eval(javax.script.ScriptEngine,java.io.Reader,groovy.lang.Binding) throws javax.script.ScriptException, public static java.lang.Object org.codehaus.groovy.jsr223.ScriptExtensions.eval(javax.script.ScriptEngine,java.lang.String,groovy.lang.Binding) throws javax.script.ScriptException, public static javax.script.ScriptEngine org.codehaus.groovy.jsr223.ScriptStaticExtensions.$static_propertyMissing(javax.script.ScriptEngineManager,java.lang.String)]

	以上过程也在同时不断写MetaClassRegistryImpl类的
	private FastArray instanceMethods = new FastArray();
    private FastArray staticMethods = new FastArray();