/** * Copyright 2010 JBoss Inc * * 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.drools.base.mvel; import java.io.Externalizable; import java.io.IOException; import java.io.ObjectInput; import java.io.ObjectOutput; import java.io.Serializable; import org.drools.WorkingMemory; import org.drools.common.InternalRuleBase; import org.drools.rule.MVELDialectRuntimeData; import org.drools.rule.Package; import org.drools.spi.Consequence; import org.drools.spi.KnowledgeHelper; import org.mvel2.MVEL; import org.mvel2.compiler.CompiledExpression; import org.mvel2.debug.DebugTools; public class MVELConsequence implements Consequence, MVELCompileable, Externalizable { private static final long serialVersionUID = 510l; private MVELCompilationUnit unit; private String id; private Serializable expr; private DroolsMVELFactory prototype; public MVELConsequence() { } public MVELConsequence(final MVELCompilationUnit unit, final String id) { this.unit = unit; this.id = id; } public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { unit = (MVELCompilationUnit) in.readObject(); id = in.readUTF(); } public void writeExternal(ObjectOutput out) throws IOException { out.writeObject( unit ); out.writeUTF( id ); } public void compile(ClassLoader classLoader) { expr = unit.getCompiledExpression( classLoader ); prototype = unit.getFactory(); } public void evaluate(final KnowledgeHelper knowledgeHelper, final WorkingMemory workingMemory) throws Exception { DroolsMVELFactory factory = (DroolsMVELFactory) this.prototype.clone(); factory.setContext( knowledgeHelper.getTuple(), knowledgeHelper, null, workingMemory, null ); // do we have any functions for this namespace? Package pkg = workingMemory.getRuleBase().getPackage( "MAIN" ); if ( pkg != null ) { MVELDialectRuntimeData data = (MVELDialectRuntimeData) pkg .getDialectRuntimeRegistry().getDialectData( this.id ); factory.setNextFactory( data.getFunctionFactory() ); } CompiledExpression compexpr = (CompiledExpression) this.expr; pkg = knowledgeHelper.getWorkingMemory().getRuleBase().getPackage(knowledgeHelper.getRule().getPackage() ); ClassLoader tempClassLoader = Thread.currentThread().getContextClassLoader(); Thread.currentThread().setContextClassLoader( ((InternalRuleBase) workingMemory.getRuleBase()).getRootClassLoader() ); try { if ( MVELDebugHandler.isDebugMode() ) { if ( MVELDebugHandler.verbose ) { System.out.println( "Executing expression " + compexpr.getSourceName() ); System.out.println( DebugTools.decompile( compexpr ) ); } MVEL.executeDebugger( compexpr, null, factory ); } else { MVEL.executeExpression( compexpr, null, factory ); } } finally { Thread.currentThread().setContextClassLoader( tempClassLoader ); } } public Serializable getCompExpr() { return expr; } public String getName() { return "default"; } }