001 /*
002 * $Id: CachingGroovyEngine.java,v 1.6 2005/08/20 19:02:15 blackdrag Exp $
003 *
004 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005 *
006 * Redistribution and use of this software and associated documentation
007 * ("Software"), with or without modification, are permitted provided that the
008 * following conditions are met: 1. Redistributions of source code must retain
009 * copyright statements and notices. Redistributions must also contain a copy
010 * of this document. 2. Redistributions in binary form must reproduce the above
011 * copyright notice, this list of conditions and the following disclaimer in
012 * the documentation and/or other materials provided with the distribution. 3.
013 * The name "groovy" must not be used to endorse or promote products derived
014 * from this Software without prior written permission of The Codehaus. For
015 * written permission, please contact info@codehaus.org. 4. Products derived
016 * from this Software may not be called "groovy" nor may "groovy" appear in
017 * their names without prior written permission of The Codehaus. "groovy" is a
018 * registered trademark of The Codehaus. 5. Due credit should be given to The
019 * Codehaus - http://groovy.codehaus.org/
020 *
021 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
022 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
023 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
024 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
025 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
027 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
028 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
029 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
030 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
031 * DAMAGE.
032 *
033 */
034 package org.codehaus.groovy.bsf;
035
036 import groovy.lang.Binding;
037 import groovy.lang.GroovyClassLoader;
038 import groovy.lang.GroovyShell;
039 import groovy.lang.Script;
040 import org.apache.bsf.BSFDeclaredBean;
041 import org.apache.bsf.BSFException;
042 import org.apache.bsf.BSFManager;
043 import org.apache.bsf.util.BSFFunctions;
044 import org.codehaus.groovy.control.CompilerConfiguration;
045 import org.codehaus.groovy.runtime.InvokerHelper;
046
047 import java.io.ByteArrayInputStream;
048 import java.security.AccessController;
049 import java.security.PrivilegedAction;
050 import java.util.HashMap;
051 import java.util.Map;
052 import java.util.Vector;
053
054 /**
055 * A Caching implementation of the GroovyEngine
056 *
057 * @author James Birchfield
058 */
059 public class CachingGroovyEngine extends GroovyEngine {
060 private static final Object[] EMPTY_ARGS = new Object[]{new String[]{}};
061
062 private Map evalScripts;
063 private Map execScripts;
064 private Binding context;
065 private ClassLoader parent;
066 private GroovyClassLoader loader;
067
068
069 /**
070 * Evaluate an expression.
071 */
072 public Object eval(String source, int lineNo, int columnNo, Object script) throws BSFException {
073 try {
074 // Object result = shell.evaluate(script.toString(), source);
075 Class scriptClass = (Class) evalScripts.get(script);
076 if (scriptClass == null) {
077 scriptClass = loader.parseClass(new ByteArrayInputStream(script.toString().getBytes()), source);
078 evalScripts.put(script, scriptClass);
079 } else {
080 System.out.println("eval() - Using cached script...");
081 }
082 //can't cache the script because the context may be different.
083 //but don't bother loading parsing the class again
084 Script s = InvokerHelper.createScript(scriptClass, context);
085 return s.run();
086 } catch (Exception e) {
087 throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
088 }
089 }
090
091 /**
092 * Execute a script.
093 */
094 public void exec(String source, int lineNo, int columnNo, Object script) throws BSFException {
095 try {
096 // shell.run(script.toString(), source, EMPTY_ARGS);
097
098 Class scriptClass = (Class) execScripts.get(script);
099 if (scriptClass == null) {
100 scriptClass = loader.parseClass(new ByteArrayInputStream(script.toString().getBytes()), source);
101 execScripts.put(script, scriptClass);
102 } else {
103 System.out.println("exec() - Using cached version of class...");
104 }
105 InvokerHelper.invokeMethod(scriptClass, "main", EMPTY_ARGS);
106 } catch (Exception e) {
107 System.err.println("BSF trace");
108 e.printStackTrace(System.err);
109 throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
110 }
111 }
112
113 /**
114 * Initialize the engine.
115 */
116 public void initialize(final BSFManager mgr, String lang, Vector declaredBeans) throws BSFException {
117 super.initialize(mgr, lang, declaredBeans);
118 parent = mgr.getClassLoader();
119 if (parent == null)
120 parent = GroovyShell.class.getClassLoader();
121 final ClassLoader finalParent = parent;
122 this.loader =
123 (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
124 public Object run() {
125 CompilerConfiguration configuration = new CompilerConfiguration();
126 configuration.setClasspath(mgr.getClassPath());
127 return new GroovyClassLoader(finalParent, configuration);
128 }
129 });
130 execScripts = new HashMap();
131 evalScripts = new HashMap();
132 context = shell.getContext();
133 // create a shell
134
135 // register the mgr with object name "bsf"
136 context.setVariable("bsf", new BSFFunctions(mgr, this));
137
138 int size = declaredBeans.size();
139 for (int i = 0; i < size; i++) {
140 declareBean((BSFDeclaredBean) declaredBeans.elementAt(i));
141 }
142 }
143 }