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BEGIN LICENSE BLOCK ***** Version: EPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Eclipse Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.eclipse.org/legal/epl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the EPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the EPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 package org.jruby.ext.delegate;
 
 import org.jruby.Ruby;
This library extends the delegate stdlib with a native method_missing, in order to reduce the cost of delegating through to the target object. It only supports 1.9 and higher, since 1.8 actively defined all methods from the target object rather than simply delegating all calls through method_missing. Note that this does no call site caching and interferes with advanced call site binding logic as found in our invokedynamic support. Future improvement would be to cache recent methods or wire up indy logic to see through delegation.
 
 public class NativeDelegateLibrary implements Library{
     public void load(Ruby runtimeboolean wrap) {
         assert !runtime.is1_8() : "the native delegator extension is not compatible with 1.8";
         
         RubyClass delegateClass = runtime.getClass("Delegator");
         delegateClass.defineAnnotatedMethods(NativeDelegateLibrary.class);
     }
     
     @JRubyMethod(omit = true)
     public static IRubyObject method_missing(ThreadContext contextIRubyObject selfIRubyObject arg0Block block) {
         String methodName = arg0.asJavaString();
         RubyBasicObject object = (RubyBasicObject)self.callMethod(context"__getobj__");
         
         DynamicMethod method = object.getMetaClass().searchMethod(methodName);
         
         if (method.isUndefined()) {
             // catch respond_to? and respond_to_missing? cases
             if (object.callMethod(context"respond_to?"arg0).isTrue()) {
                 return object.callMethod(contextmethodName.block);
             }
             RubyKernel.methodMissing(contextselfmethodName...block);
         } else if (method.getVisibility().isPrivate()) {
             RubyKernel.methodMissing(contextselfmethodName...block);
         }
         
         return method.call(contextobjectobject.getMetaClass(), methodNameblock);
     }
 
     @JRubyMethod(omit = true)
     public static IRubyObject method_missing(ThreadContext contextIRubyObject selfIRubyObject arg0IRubyObject arg1Block block) {
         String methodName = arg0.asJavaString();
         RubyBasicObject object = (RubyBasicObject)self.callMethod(context"__getobj__");
         
         DynamicMethod method = object.getMetaClass().searchMethod(methodName);
         
         if (method.isUndefined()) {
             // catch respond_to? and respond_to_missing? cases
             if (object.callMethod(context"respond_to?"arg0).isTrue()) {
                 return object.callMethod(contextmethodNamenew IRubyObject[] {arg1}, block);
             }
             RubyKernel.methodMissing(contextselfmethodName..new IRubyObject[] {arg1}, block);
         } else if (method.getVisibility().isPrivate()) {
             RubyKernel.methodMissing(contextselfmethodName..new IRubyObject[] {arg1}, block);
         }
         
         return method.call(contextobjectobject.getMetaClass(), methodNamearg1block);
     }
 
    @JRubyMethod(omit = true)
    public static IRubyObject method_missing(ThreadContext contextIRubyObject selfIRubyObject arg0IRubyObject arg1IRubyObject arg2Block block) {
        String methodName = arg0.asJavaString();
        RubyBasicObject object = (RubyBasicObject)self.callMethod(context"__getobj__");
        
        DynamicMethod method = object.getMetaClass().searchMethod(methodName);
        
        if (method.isUndefined()) {
            // catch respond_to? and respond_to_missing? cases
            if (object.callMethod(context"respond_to?"arg0).isTrue()) {
                return object.callMethod(contextmethodNamenew IRubyObject[] {arg1arg2}, block);
            }
            RubyKernel.methodMissing(contextselfmethodName..new IRubyObject[] {arg1arg2}, block);
        } else if (method.getVisibility().isPrivate()) {
            RubyKernel.methodMissing(contextselfmethodName..new IRubyObject[] {arg1arg2}, block);
        }
        
        return method.call(contextobjectobject.getMetaClass(), methodNamearg1arg2block);
    }
    @JRubyMethod(required = 1, rest = true, omit = true)
    public static IRubyObject method_missing(ThreadContext contextIRubyObject selfIRubyObject[] argsBlock block) {
        IRubyObject[] newArgs = new IRubyObject[args.length - 1];
        System.arraycopy(args, 1, newArgs, 0, newArgs.length);
        String methodName = args[0].asJavaString();
        RubyBasicObject object = (RubyBasicObject)self.callMethod(context"__getobj__");
        
        DynamicMethod method = object.getMetaClass().searchMethod(methodName);
        
        if (method.isUndefined()) {
            // catch respond_to? and respond_to_missing? cases
            if (object.callMethod(context"respond_to?"args[0]).isTrue()) {
                return object.callMethod(contextmethodNamenewArgsblock);
            }
            RubyKernel.methodMissing(contextselfmethodName..newArgsblock);
        } else if (method.getVisibility().isPrivate()) {
            RubyKernel.methodMissing(contextselfmethodName..newArgsblock);
        }
        
        return method.call(contextobjectobject.getMetaClass(), methodNamenewArgsblock);
    }
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