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 }