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 }