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 java.util.List;
import org.drools.rule.MVELDialectRuntimeData;
import org.drools.rule.Package;
import org.drools.WorkingMemory;
import org.drools.spi.Action;
import org.drools.spi.KnowledgeHelper;
import org.drools.spi.ProcessContext;
import org.mvel2.MVEL;
import org.mvel2.compiler.CompiledExpression;
import org.mvel2.debug.DebugTools;
import org.mvel2.integration.impl.SimpleValueResolver;
public class MVELAction
implements
Action,
MVELCompileable,
Externalizable {
private static final long serialVersionUID = 400L;
private MVELCompilationUnit unit;
private String id;
private Serializable expr;
private DroolsMVELFactory prototype;
private List<String> variableNames;
public MVELAction() {
}
public MVELAction(final MVELCompilationUnit unit,
final String id) {
this.unit = unit;
this.id = id;
}
public void setVariableNames(List<String> variableNames) {
this.variableNames = variableNames;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
id = in.readUTF();
unit = ( MVELCompilationUnit ) in.readObject();
variableNames = (List<String>) in.readObject();
// expr = (Serializable)in.readObject();
// prototype = (DroolsMVELFactory)in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeUTF( id );
out.writeObject( unit );
out.writeObject(variableNames);
// out.writeObject(expr);
// out.writeObject(prototype);
}
public void compile(ClassLoader classLoader) {
expr = unit.getCompiledExpression( classLoader );
prototype = unit.getFactory( );
}
public String getDialect() {
return id;
}
public void execute(final KnowledgeHelper knowledgeHelper, final WorkingMemory workingMemory, ProcessContext context) throws Exception {
// must clone to avoid concurrency problems
DroolsMVELFactory factory = (DroolsMVELFactory) this.prototype.clone();
factory.addResolver("context", new SimpleValueResolver(context));
factory.addResolver("kcontext", new SimpleValueResolver(context));
if (variableNames != null) {
for (String variableName: variableNames) {
factory.addResolver(
variableName, new SimpleValueResolver(context.getVariable(variableName)));
}
}
factory.setContext( null,
knowledgeHelper,
null,
workingMemory,
null );
Package pkg = workingMemory.getRuleBase().getPackage( "MAIN" );
if ( pkg != null ) {
MVELDialectRuntimeData data = ( MVELDialectRuntimeData ) pkg.getDialectRuntimeRegistry().getDialectData( id );
factory.setNextFactory( data.getFunctionFactory() );
}
CompiledExpression compexpr = (CompiledExpression) this.expr;
//Receive breakpoints from debugger
MVELDebugHandler.prepare();
if ( MVELDebugHandler.isDebugMode() ) {
if ( MVELDebugHandler.verbose ) {
System.out.println( DebugTools.decompile( compexpr ) );
}
MVEL.executeDebugger( compexpr,
null,
factory );
} else {
MVEL.executeExpression( compexpr,
null,
factory );
}
}
public Serializable getCompExpr() {
return expr;
}
}