001 /*
002 * $Id: CachingGroovyEngine.java,v 1.5 2004/12/14 00:08:26 spullara 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 String[] EMPTY_ARGS = {
061 };
062
063 private Map evalScripts;
064 private Map execScripts;
065 private Binding context;
066 private ClassLoader parent;
067 private GroovyClassLoader loader;
068
069
070 /**
071 * Evaluate an expression.
072 */
073 public Object eval(String source, int lineNo, int columnNo, Object script) throws BSFException {
074 try {
075 // Object result = shell.evaluate(script.toString(), source);
076 Class scriptClass = (Class) evalScripts.get(script);
077 if (scriptClass == null) {
078 scriptClass = loader.parseClass(new ByteArrayInputStream(script.toString().getBytes()), source);
079 evalScripts.put(script, scriptClass);
080 } else {
081 System.out.println("eval() - Using cached script...");
082 }
083 //can't cache the script because the context may be different.
084 //but don't bother loading parsing the class again
085 Script s = InvokerHelper.createScript(scriptClass, context);
086 return s.run();
087 } catch (Exception e) {
088 throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
089 }
090 }
091
092 /**
093 * Execute a script.
094 */
095 public void exec(String source, int lineNo, int columnNo, Object script) throws BSFException {
096 try {
097 // shell.run(script.toString(), source, EMPTY_ARGS);
098
099 Class scriptClass = (Class) execScripts.get(script);
100 if (scriptClass == null) {
101 scriptClass = loader.parseClass(new ByteArrayInputStream(script.toString().getBytes()), source);
102 execScripts.put(script, scriptClass);
103 } else {
104 System.out.println("exec() - Using cached version of class...");
105 }
106 InvokerHelper.invokeMethod(scriptClass, "main", EMPTY_ARGS);
107 } catch (Exception e) {
108 throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "exception from Groovy: " + e, e);
109 }
110 }
111
112 /**
113 * Initialize the engine.
114 */
115 public void initialize(final BSFManager mgr, String lang, Vector declaredBeans) throws BSFException {
116 super.initialize(mgr, lang, declaredBeans);
117 parent = mgr.getClassLoader();
118 if (parent == null)
119 parent = GroovyShell.class.getClassLoader();
120 final ClassLoader finalParent = parent;
121 this.loader =
122 (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
123 public Object run() {
124 CompilerConfiguration configuration = new CompilerConfiguration();
125 configuration.setClasspath(mgr.getClassPath());
126 return new GroovyClassLoader(finalParent, configuration);
127 }
128 });
129 execScripts = new HashMap();
130 evalScripts = new HashMap();
131 context = shell.getContext();
132 // create a shell
133
134 // register the mgr with object name "bsf"
135 context.setVariable("bsf", new BSFFunctions(mgr, this));
136
137 int size = declaredBeans.size();
138 for (int i = 0; i < size; i++) {
139 declareBean((BSFDeclaredBean) declaredBeans.elementAt(i));
140 }
141 }
142 }