| /* |
| * Copyright 2003-2007 the original author or authors. |
| * |
| * Licensed 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.codehaus.groovy.bsf; |
| |
| import groovy.lang.Binding; |
| import groovy.lang.GroovyClassLoader; |
| import groovy.lang.GroovyShell; |
| import groovy.lang.Script; |
| import org.apache.bsf.BSFDeclaredBean; |
| import org.apache.bsf.BSFException; |
| import org.apache.bsf.BSFManager; |
| import org.apache.bsf.util.BSFFunctions; |
| import org.codehaus.groovy.control.CompilerConfiguration; |
| import org.codehaus.groovy.runtime.InvokerHelper; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Vector; |
| import java.util.logging.Logger; |
| import java.util.logging.Level; |
| |
| /** |
| * A Caching implementation of the GroovyEngine |
| * |
| * @author James Birchfield |
| */ |
| public class CachingGroovyEngine extends GroovyEngine { |
| private static final Logger LOG = Logger.getLogger(CachingGroovyEngine.class.getName()); |
| private static final Object[] EMPTY_ARGS = new Object[]{new String[]{}}; |
| |
| private Map evalScripts; |
| private Map execScripts; |
| private Binding context; |
| private GroovyClassLoader loader; |
| |
| /** |
| * Evaluate an expression. |
| */ |
| public Object eval(String source, int lineNo, int columnNo, Object script) throws BSFException { |
| try { |
| Class scriptClass = (Class) evalScripts.get(script); |
| if (scriptClass == null) { |
| scriptClass = loader.parseClass(script.toString(), source); |
| evalScripts.put(script, scriptClass); |
| } else { |
| LOG.fine("eval() - Using cached script..."); |
| } |
| //can't cache the script because the context may be different. |
| //but don't bother loading parsing the class again |
| Script s = InvokerHelper.createScript(scriptClass, context); |
| return s.run(); |
| } catch (Exception e) { |
| throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e); |
| } |
| } |
| |
| /** |
| * Execute a script. |
| */ |
| public void exec(String source, int lineNo, int columnNo, Object script) throws BSFException { |
| try { |
| // shell.run(script.toString(), source, EMPTY_ARGS); |
| |
| Class scriptClass = (Class) execScripts.get(script); |
| if (scriptClass == null) { |
| scriptClass = loader.parseClass(script.toString(), source); |
| execScripts.put(script, scriptClass); |
| } else { |
| LOG.fine("exec() - Using cached version of class..."); |
| } |
| InvokerHelper.invokeMethod(scriptClass, "main", EMPTY_ARGS); |
| } catch (Exception e) { |
| LOG.log(Level.WARNING, "BSF trace", e); |
| throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e); |
| } |
| } |
| |
| /** |
| * Initialize the engine. |
| */ |
| public void initialize(final BSFManager mgr, String lang, Vector declaredBeans) throws BSFException { |
| super.initialize(mgr, lang, declaredBeans); |
| ClassLoader parent = mgr.getClassLoader(); |
| if (parent == null) |
| parent = GroovyShell.class.getClassLoader(); |
| final ClassLoader finalParent = parent; |
| this.loader = |
| (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() { |
| public Object run() { |
| CompilerConfiguration configuration = new CompilerConfiguration(); |
| configuration.setClasspath(mgr.getClassPath()); |
| return new GroovyClassLoader(finalParent, configuration); |
| } |
| }); |
| execScripts = new HashMap(); |
| evalScripts = new HashMap(); |
| context = shell.getContext(); |
| // create a shell |
| // register the mgr with object name "bsf" |
| context.setVariable("bsf", new BSFFunctions(mgr, this)); |
| int size = declaredBeans.size(); |
| for (int i = 0; i < size; i++) { |
| declareBean((BSFDeclaredBean) declaredBeans.elementAt(i)); |
| } |
| } |
| } |