Move Tuscany from Incubator to top level.

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@668359 13f79535-47bb-0310-9956-ffa450edef68

5 files changed, 755 insertions, 0 deletions

diff --git a/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementation.java b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementation.java
new file mode 100644
index 0000000000..b01fbdd866
--- /dev/null
+++ b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementation.java
@@ -0,0 +1,70 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.sca.implementation.script;
+
+import org.apache.tuscany.sca.spi.utils.DynamicImplementation;
+import org.apache.tuscany.sca.spi.utils.ResourceHelper;
+
+/**
+ * Represents a Script implementation.
+ */
+public class ScriptImplementation extends DynamicImplementation {
+
+    protected String scriptName;
+    protected String scriptSrc;
+    protected String scriptLanguage;
+
+    public String getScript() {
+        return scriptName;
+    }
+
+    public void setScript(String scriptName) {
+        this.scriptName = scriptName;
+    }
+
+    public void setLanguage(String language) {
+        this.scriptLanguage = language;
+    }
+
+    public void setElementText(String elementText) {
+        scriptSrc = elementText;
+    }
+
+    public String getScriptLanguage() {
+        if (scriptLanguage == null || scriptLanguage.length() < 1) {
+            int i = scriptName.lastIndexOf('.');
+            if (i > 0) {
+                scriptLanguage = scriptName.substring(i + 1);
+            }
+        }
+        return scriptLanguage;
+    }
+
+    public String getScriptSrc() {
+        if (scriptSrc == null) {
+            if (scriptName == null) {
+                throw new IllegalArgumentException("script name is null and no inline source used");
+            }
+
+            // TODO: how should resources be read? Soould this use the contrabution sevrice?
+            scriptSrc = ResourceHelper.readResource(scriptName);
+        }
+        return scriptSrc;
+    }
+}
diff --git a/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationActivator.java b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationActivator.java
new file mode 100644
index 0000000000..d808b55105
--- /dev/null
+++ b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationActivator.java
@@ -0,0 +1,45 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.script;
+
+import org.apache.tuscany.sca.assembly.ComponentType;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.spi.ImplementationActivator;
+import org.apache.tuscany.sca.spi.InvokerFactory;
+import org.apache.tuscany.sca.spi.utils.PropertyValueObjectFactory;
+
+public class ScriptImplementationActivator implements ImplementationActivator<ScriptImplementation> {
+
+    // TODO: seems wrong to need PropertyValueObjectFactory, could it be on Property somehow? 
+    protected PropertyValueObjectFactory propertyFactory;
+
+    public ScriptImplementationActivator(PropertyValueObjectFactory propertyFactory) {
+        this.propertyFactory = propertyFactory;
+    }
+
+    public Class<ScriptImplementation> getImplementationClass() {
+        return ScriptImplementation.class;
+    }
+
+    public InvokerFactory createInvokerFactory(RuntimeComponent rc, ComponentType ct, ScriptImplementation implementation) {
+        return new ScriptInvokerFactory(rc, ct, implementation, propertyFactory);
+    }
+
+}
diff --git a/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvoker.java b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvoker.java
new file mode 100644
index 0000000000..938f8ca0f5
--- /dev/null
+++ b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvoker.java
@@ -0,0 +1,71 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.script;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptException;
+
+import org.apache.axiom.om.OMElement;
+import org.apache.bsf.xml.XMLHelper;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.invocation.Message;
+
+/**
+ * Perform the actual script invocation
+ */
+public class ScriptInvoker implements Invoker {
+
+    protected ScriptEngine scriptEngine;
+    protected XMLHelper xmlHelper;
+    protected Operation operation;
+
+    public ScriptInvoker(ScriptEngine scriptEngine, XMLHelper xmlHelper, Operation operation) {
+        this.scriptEngine = scriptEngine;
+        this.xmlHelper = xmlHelper;
+        this.operation = operation;
+    }
+
+    protected Object doInvoke(Object[] objects) throws ScriptException {
+        if (xmlHelper != null) {
+            objects[0] = xmlHelper.toScriptXML((OMElement)objects[0]);
+        }
+
+        Object response = ((Invocable)scriptEngine).invokeFunction(operation.getName(), objects);
+
+        if (xmlHelper != null) {
+            response = xmlHelper.toOMElement(response);
+        }
+
+        return response;
+    }
+
+    public Message invoke(Message msg) {
+        try {
+            Object resp = doInvoke((Object[])msg.getBody());
+            msg.setBody(resp);
+        } catch (ScriptException e) {
+            msg.setFaultBody(e.getCause());
+        }
+        return msg;
+    }
+
+}
diff --git a/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvokerFactory.java b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvokerFactory.java
new file mode 100644
index 0000000000..e3121dc6bc
--- /dev/null
+++ b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptInvokerFactory.java
@@ -0,0 +1,124 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+
+package org.apache.tuscany.sca.implementation.script;
+
+import java.io.StringReader;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+
+import org.apache.axiom.om.OMElement;
+import org.apache.bsf.xml.XMLHelper;
+import org.apache.tuscany.sca.assembly.ComponentReference;
+import org.apache.tuscany.sca.assembly.ComponentType;
+import org.apache.tuscany.sca.assembly.Property;
+import org.apache.tuscany.sca.assembly.Reference;
+import org.apache.tuscany.sca.assembly.Service;
+import org.apache.tuscany.sca.factory.ObjectCreationException;
+import org.apache.tuscany.sca.factory.ObjectFactory;
+import org.apache.tuscany.sca.implementation.script.engines.TuscanyJRubyScriptEngine;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.Operation;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.interfacedef.wsdl.WSDLInterfaceContract;
+import org.apache.tuscany.sca.invocation.Invoker;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.spi.InvokerFactory;
+import org.apache.tuscany.sca.spi.utils.PropertyValueObjectFactory;
+
+public class ScriptInvokerFactory implements InvokerFactory {
+
+    protected ScriptEngine scriptEngine;
+    protected XMLHelper xmlHelper;
+
+    public ScriptInvokerFactory(RuntimeComponent rc, ComponentType ct, ScriptImplementation implementation, PropertyValueObjectFactory propertyFactory) {
+        init(rc, ct, implementation, propertyFactory);
+    }
+    
+    public Invoker createInvoker(Operation operation) {
+        return new ScriptInvoker(scriptEngine, xmlHelper, operation);
+    }
+    
+    protected void init(RuntimeComponent rc, ComponentType ct, ScriptImplementation implementation, PropertyValueObjectFactory propertyFactory) {
+        try {
+            scriptEngine = getScriptEngineByExtension(implementation.getScriptLanguage());
+            if (scriptEngine == null) {
+                throw new ObjectCreationException("no script engine found for language: " + implementation.getScriptLanguage());
+            }
+            if (!(scriptEngine instanceof Invocable)) {
+                throw new ObjectCreationException("script engine does not support Invocable: " + scriptEngine);
+            }
+            
+            for (Reference reference : ct.getReferences()) {
+                scriptEngine.put(reference.getName(), createReferenceProxy(reference.getName(), rc));
+            }
+
+            for (Property property : implementation.getProperties()) {
+                ObjectFactory<?> propertyValueFactory = propertyFactory.createValueFactory(property);
+                if ( propertyValueFactory != null) {
+                    scriptEngine.put(property.getName(), propertyValueFactory.getInstance());
+                }
+            }
+            
+            scriptEngine.eval(new StringReader(implementation.getScriptSrc()));
+
+        } catch (ScriptException e) {
+            throw new ObjectCreationException(e);
+        }
+
+        // set the databinding and xmlhelper for wsdl interfaces
+        for (Service service : rc.getServices()) {
+            InterfaceContract ic = service.getInterfaceContract();
+            if (ic instanceof WSDLInterfaceContract) {
+                // Set to use the Axiom data binding
+                ic.getInterface().setDefaultDataBinding(OMElement.class.getName());
+                xmlHelper = XMLHelper.getArgHelper(scriptEngine);
+            }
+        }
+    }
+
+    /**
+     * TODO: RuntimeComponent should provide a method like this
+     */
+    @SuppressWarnings("unchecked")
+    protected Object createReferenceProxy(String name, RuntimeComponent component) {
+        for (ComponentReference reference : component.getReferences()) {
+            if (reference.getName().equals(name)) {
+                Class iface = ((JavaInterface)reference.getInterfaceContract().getInterface()).getJavaClass();
+                return component.getService(iface, name);
+            }
+        }
+        throw new IllegalArgumentException("reference " + name + " not found on component: " + component);
+    }
+
+    /**
+     * Hack for now to work around a problem with the JRuby script engine
+     */
+    protected ScriptEngine getScriptEngineByExtension(String scriptExtn) {
+        ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
+        if ("rb".equals(scriptExtn)) {
+            return new TuscanyJRubyScriptEngine();
+        } else {
+            return scriptEngineManager.getEngineByExtension(scriptExtn);
+        }
+    }
+}
diff --git a/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java
new file mode 100644
index 0000000000..e87aa5636b
--- /dev/null
+++ b/branches/sca-java-0.91/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/engines/TuscanyJRubyScriptEngine.java
@@ -0,0 +1,445 @@
+/*

+* Copyright (c) 2006, Sun Microsystems, Inc.

+* All rights reserved.

+* 

+* Redistribution and use in source and binary forms, with or without 

+* modification, are permitted provided that the following conditions are met:

+* 

+*  - Redistributions of source code must retain the above copyright notice, this 

+*    list of conditions and the following disclaimer.

+* 

+*  - Redistributions in binary form must reproduce the above copyright notice, 

+*    this list of conditions and the following disclaimer in the documentation 

+*    and/or other materials provided with the distribution.

+* 

+*  - Neither the name of the Sun Microsystems, Inc. nor the names of 

+*    contributors may be used to endorse or promote products derived from this 

+*    software without specific prior written permission.

+* 

+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 

+* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED 

+* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 

+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 

+* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 

+* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY 

+* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 

+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 

+* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 

+* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 

+* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 

+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 

+* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 

+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 

+* DAMAGE. 

+*/

+package org.apache.tuscany.sca.implementation.script.engines;

+

+import java.io.File;

+import java.io.Reader;

+import java.lang.reflect.InvocationHandler;

+import java.lang.reflect.Method;

+import java.lang.reflect.Proxy;

+import java.util.ArrayList;

+import java.util.Arrays;

+import java.util.Collections;

+import java.util.Iterator;

+import java.util.List;

+

+import javax.script.AbstractScriptEngine;

+import javax.script.Bindings;

+import javax.script.Compilable;

+import javax.script.CompiledScript;

+import javax.script.Invocable;

+import javax.script.ScriptContext;

+import javax.script.ScriptEngine;

+import javax.script.ScriptEngineFactory;

+import javax.script.ScriptException;

+import javax.script.SimpleBindings;

+

+import org.jruby.Ruby;

+import org.jruby.ast.Node;

+import org.jruby.internal.runtime.GlobalVariable;

+import org.jruby.internal.runtime.GlobalVariables;

+import org.jruby.internal.runtime.ReadonlyAccessor;

+import org.jruby.javasupport.Java;

+import org.jruby.javasupport.JavaObject;

+import org.jruby.javasupport.JavaUtil;

+import org.jruby.runtime.Block;

+import org.jruby.runtime.IAccessor;

+import org.jruby.runtime.builtin.IRubyObject;

+

+import com.sun.script.jruby.JRubyScriptEngineFactory;

+

+/* 

+ * This class is a copy of the class com.sun.script.ruby.JRubyScriptEngine with some minor modifications

+ * to work around problems with Tuscany setting SCA properties and references as global variable in JRuby

+ * Should only need it temporarily till a new BSF release fixes it.

+ */

+@SuppressWarnings("unchecked")

+public class TuscanyJRubyScriptEngine extends AbstractScriptEngine 

+        implements Compilable, Invocable { 

+

+    // my factory, may be null

+    private ScriptEngineFactory factory;

+    private Ruby runtime;

+   

+    public TuscanyJRubyScriptEngine() {

+        init(System.getProperty("com.sun.script.jruby.loadpath"));

+    }

+

+    public TuscanyJRubyScriptEngine(String loadPath) {

+        init(loadPath);

+    }

+

+    // my implementation for CompiledScript

+    private class JRubyCompiledScript extends CompiledScript {

+        // my compiled code

+        private Node node;     

+

+        JRubyCompiledScript (Node node) {

+            this.node = node;

+        }

+

+        public ScriptEngine getEngine() {

+            return TuscanyJRubyScriptEngine.this;

+        }

+

+        public Object eval(ScriptContext ctx) throws ScriptException {

+            return evalNode(node, ctx);

+        }

+    }

+

+    // Compilable methods

+    public CompiledScript compile(String script) 

+                                  throws ScriptException {  

+        Node node = compileScript(script, context);

+        return new JRubyCompiledScript(node);

+    }

+

+    public CompiledScript compile (Reader reader) 

+                                  throws ScriptException {  

+        Node node = compileScript(reader, context);

+        return new JRubyCompiledScript(node);

+    }

+

+    // Invocable methods

+    public Object invokeFunction(String name, Object[] args) 

+                         throws ScriptException {       

+        return invokeImpl(null, name, args, Object.class);

+    }

+

+    public Object invokeMethod(Object obj, String name, Object[] args) 

+                         throws ScriptException {       

+        if (obj == null) {

+            throw new IllegalArgumentException("script object is null");

+        }

+        return invokeImpl(obj, name, args, Object.class);

+    }

+

+    public Object getInterface(Object obj, Class clazz) {

+        if (obj == null) {

+            throw new IllegalArgumentException("script object is null");

+        }

+        return makeInterface(obj, clazz);

+    }

+

+    public Object getInterface(Class clazz) {

+        return makeInterface(null, clazz);

+    }

+

+    private <T> T makeInterface(Object obj, Class<T> clazz) {

+        if (clazz == null || !clazz.isInterface()) {

+            throw new IllegalArgumentException("interface Class expected");

+        }

+        final Object thiz = obj;

+        return (T) Proxy.newProxyInstance(

+              clazz.getClassLoader(),

+              new Class[] { clazz },

+              new InvocationHandler() {

+                  public Object invoke(Object proxy, Method m, Object[] args)

+                                       throws Throwable {

+                      return invokeImpl(thiz, m.getName(),

+                                        args, m.getReturnType());

+                  }

+              });

+    }

+

+    // ScriptEngine methods

+    public synchronized Object eval(String str, ScriptContext ctx) 

+                       throws ScriptException { 

+        Node node = compileScript(str, ctx);

+        return evalNode(node, ctx);

+    }

+

+    public synchronized Object eval(Reader reader, ScriptContext ctx)

+                       throws ScriptException { 

+        Node node = compileScript(reader, ctx);

+        return evalNode(node, ctx);

+    }

+

+    public ScriptEngineFactory getFactory() {

+        synchronized (this) {

+            if (factory == null) {

+                factory = new JRubyScriptEngineFactory();

+            }

+        }

+        return factory;

+    }

+

+    public Bindings createBindings() {

+        return new SimpleBindings();

+    }

+

+    // package-private methods

+    void setFactory(ScriptEngineFactory factory) {

+        this.factory = factory;

+    } 

+

+    // internals only below this point    

+

+    private Object rubyToJava(IRubyObject value) {

+        return rubyToJava(value, Object.class);

+    }

+

+    private Object rubyToJava(IRubyObject value, Class type) {

+        return JavaUtil.convertArgument(

+                 Java.ruby_to_java(value, value, Block.NULL_BLOCK), 

+                 type);

+    }

+

+    private IRubyObject javaToRuby(Object value) {

+        if (value instanceof IRubyObject) {

+            return (IRubyObject) value;

+        }

+        IRubyObject result = JavaUtil.convertJavaToRuby(runtime, value);

+        if (result instanceof JavaObject) {

+            return runtime.getModule("JavaUtilities").callMethod(runtime.getCurrentContext(), "wrap", result);

+        }

+        return result;

+    }   

+

+    private synchronized Node compileScript(String script, ScriptContext ctx) 

+                                 throws ScriptException {        

+        GlobalVariables oldGlobals = runtime.getGlobalVariables();  

+        try {

+            setGlobalVariables(ctx);

+            String filename = (String) ctx.getAttribute(ScriptEngine.FILENAME);

+            if (filename == null) {

+                filename = "<unknown>";

+            }

+            return runtime.parse(script, filename, null, 0);

+        } catch (Exception exp) {

+            throw new ScriptException(exp);

+        } finally {

+            if (oldGlobals != null) {

+                //setGlobalVariables(oldGlobals);

+            }

+        }

+    }

+

+    private synchronized Node compileScript(Reader reader, ScriptContext ctx) 

+                                 throws ScriptException {        

+        GlobalVariables oldGlobals = runtime.getGlobalVariables();  

+        try {

+            setGlobalVariables(ctx);

+            String filename = (String) ctx.getAttribute(ScriptEngine.FILENAME);

+            if (filename == null) {

+                filename = "<unknown>";

+            }

+            return runtime.parse(reader, filename, null, 0);

+        } catch (Exception exp) {

+            throw new ScriptException(exp);

+        } finally {

+            if (oldGlobals != null) {

+                //setGlobalVariables(oldGlobals);

+            }

+        }

+    }

+

+    private void setGlobalVariables(final ScriptContext ctx) {

+        ctx.setAttribute("context", ctx, ScriptContext.ENGINE_SCOPE);

+        setGlobalVariables(new GlobalVariables(runtime) {

+                GlobalVariables parent = runtime.getGlobalVariables();

+                

+                public void define(String name, IAccessor accessor) {

+                    assert name != null;

+                    assert accessor != null;

+                    assert name.startsWith("$");

+                    synchronized (ctx) {

+                        Bindings engineScope = ctx.getBindings(ScriptContext.ENGINE_SCOPE);                  

+                        engineScope.put(name, new GlobalVariable(accessor)); 

+                    }

+                }

+

+

+                public void defineReadonly(String name, IAccessor accessor) {

+                    assert name != null;

+                    assert accessor != null;

+                    assert name.startsWith("$");

+                    synchronized (ctx) {

+                        Bindings engineScope = ctx.getBindings(ScriptContext.ENGINE_SCOPE);

+                        engineScope.put(name, new GlobalVariable(new 

+                                             ReadonlyAccessor(name, accessor)));

+                    }

+                } 

+

+                public boolean isDefined(String name) {

+                    assert name != null;

+                    assert name.startsWith("$");

+                    synchronized (ctx) {

+                        String modifiedName = name.substring(1);

+                        boolean defined = ctx.getAttributesScope(modifiedName) != -1;

+                        return defined ? true : parent.isDefined(name);

+                    }

+                }

+

+                public void alias(String name, String oldName) {

+                    assert name != null;

+                    assert oldName != null;

+                    assert name.startsWith("$");

+                    assert oldName.startsWith("$");

+

+                    if (runtime.getSafeLevel() >= 4) {

+                        throw runtime.newSecurityError("Insecure: can't alias global variable");

+                    }

+

+                    synchronized (ctx) {

+                        int scope = ctx.getAttributesScope(name);

+                        if (scope == -1) {

+                            scope = ScriptContext.ENGINE_SCOPE;

+                        }

+

+                        IRubyObject value = get(oldName);

+                        ctx.setAttribute(name, rubyToJava(value), scope);

+                    }

+                }

+

+                public IRubyObject get(String name) {

+                    assert name != null;

+                    assert name.startsWith("$");

+

+                    synchronized (ctx) {

+                        // skip '$' and try

+                        String modifiedName = name.substring(1);

+                        int scope = ctx.getAttributesScope(modifiedName);

+                        if (scope == -1) {

+                            return parent.get(name);

+                        }

+

+                        Object obj = ctx.getAttribute(modifiedName, scope);

+                        if (obj instanceof IAccessor) {

+                            return ((IAccessor)obj).getValue();

+                        } else {

+                            return javaToRuby(obj);

+                        }

+                    }                    

+                }

+

+                public IRubyObject set(String name, IRubyObject value) {

+                    assert name != null;

+                    assert name.startsWith("$");

+

+                    if (runtime.getSafeLevel() >= 4) {

+                        throw runtime.newSecurityError("Insecure: can't change global variable value");

+                    }

+

+                    synchronized (ctx) {

+                        // skip '$' and try

+                        String modifiedName = name.substring(1);

+                        int scope = ctx.getAttributesScope(modifiedName);

+                        if (scope == -1) {

+                            scope = ScriptContext.ENGINE_SCOPE;

+                        }

+                        IRubyObject oldValue = get(name);

+                        Object obj = ctx.getAttribute(modifiedName, scope);

+                        if (obj instanceof IAccessor) {

+                            ((IAccessor)obj).setValue(value);

+                        } else {                        

+                            ctx.setAttribute(modifiedName, rubyToJava(value), scope);

+                        }

+                        return oldValue;

+                    }

+                }

+

+                public Iterator getNames() {                    

+                    List list = new ArrayList();

+                    synchronized (ctx) {

+                        Iterator<Integer> iterator = ctx.getScopes().iterator();

+                        int scope;

+                        while (iterator.hasNext()) {

+                            scope = iterator.next().intValue();

+                            Bindings b = ctx.getBindings(scope);

+                            if (b != null) {

+                                Iterator<String> bIterator = b.keySet().iterator();

+                                while (bIterator.hasNext()) {

+                                    list.add(bIterator.next());

+                                }

+                            }

+                        }

+                    }

+                    for (Iterator names = parent.getNames(); names.hasNext();) {

+                        list.add(names.next());

+                    }

+                    return Collections.unmodifiableList(list).iterator();

+                }

+            });

+    }

+

+    private void setGlobalVariables(GlobalVariables globals) {

+        runtime.setGlobalVariables(globals);

+    }

+

+    private synchronized Object evalNode(Node node, ScriptContext ctx) 

+                            throws ScriptException {

+        GlobalVariables oldGlobals = runtime.getGlobalVariables();

+        try {

+            setGlobalVariables(ctx);

+            return rubyToJava(runtime.eval(node));

+        } catch (Exception exp) {

+            throw new ScriptException(exp);

+        } finally {

+            if (oldGlobals != null) {

+                //setGlobalVariables(oldGlobals);

+            }

+        }

+    }

+

+    private void init(String loadPath) {        

+        runtime = Ruby.getDefaultInstance();

+        if (loadPath == null) {

+            loadPath = System.getProperty("java.class.path");

+        }

+        List list = Arrays.asList(loadPath.split(File.pathSeparator));

+        runtime.getLoadService().init(list);                

+        runtime.getLoadService().require("java");

+    }

+

+    private Object invokeImpl(final Object obj, String method, 

+                        Object[] args, Class returnType)

+                        throws ScriptException {

+        if (method == null) {

+            throw new NullPointerException("method name is null");

+        }

+

+        try {

+            IRubyObject rubyRecv = obj != null ? 

+                  JavaUtil.convertJavaToRuby(runtime, obj) : runtime.getTopSelf();

+

+            IRubyObject[] rubyArgs = JavaUtil.convertJavaArrayToRuby(runtime, args);

+

+            // Create Ruby proxies for any input arguments that are not primitives.

+            IRubyObject javaUtilities = runtime.getObject().getConstant("JavaUtilities");

+            for (int i = 0; i < rubyArgs.length; i++) {

+                IRubyObject tmp = rubyArgs[i];

+                if (tmp instanceof JavaObject) {

+                    rubyArgs[i] = javaUtilities.callMethod(runtime.getCurrentContext(), "wrap", tmp);

+                }

+            }

+

+            IRubyObject result = rubyRecv.callMethod(runtime.getCurrentContext(), method, rubyArgs);

+            return rubyToJava(result, returnType);

+        } catch (Exception exp) {

+            throw new ScriptException(exp);

+        }

+    }

+}
\ No newline at end of file