[rules-users] drools 4.0 compilation

[Mark Proctor]

While drools 2.x was limited to XML, 4.0 preference is for the DRL, 
which is a none xml format. It doesn't produce a jar at the moment just 
a binary Packaage instance, which you can serialise.

Mark
fuadhamidov wrote:
> hi, 
>
> i developed my project using drools 2.5. now i want to upgrade to drools
> 4.0. in my project i 
>
> (1) create xml file, 
> (2) compile xml file & get jar file, 
> (3) save jar file 
> (4) and load jar file when i need to run rules
>
> i was able to upgrade xml file to drools 4.0 xml format, but i can not do
> necessary modification in code to compile xml and get "jar or any reloadable
> file".
> There is my code that is developed for drools 2.5. Can you help me to
> upgrade it for drools 4.0?
>
>
>
>
> void compile() throws Exception {
> 	// read xml file, returns data in xml format
> 	String rulecontent = readRuleFromFile(); 
> 	byte[] bytes = null;
> 	
> 	// codes for drools 2.5. i want to develop corresponding code for 4
> statement bellow that runs with drools 4.0
> 	// RuleSetReader reader = new RuleSetReader();
> 	// RuleSet ruleSet = reader.read(new BufferedReader(new
> StringReader(rulecontent)));
> 	// RuleSetCompiler compiler = new RuleSetCompiler(ruleSet, "com.sample",
> "knowledgeHelper");
> 	// bytes = compiler.getBinaryDeploymentJar();
> 	
> 	// some codes for drools 4.0, but it is not finilized
> 	PackageBuilder builder = new PackageBuilder();
> 	builder.addPackageFromXml(new BufferedReader(new
> StringReader(rulecontent)));
> 	Package pkg = builder.getPackage();
> 	//... and then what? how do it get bytecode from package? 
> 	//may be 3 statements are not necessary for compilation	
> 	
> 	// save to disk as a jar file
> 	writeRuleToJar(bytes); 
> }
>
>
> void runrule(Object usg) throws Exception {
> 	// runs both, drools 2.5 and drools 4.0
> 	ConflictResolver[] conflictResolvers = new ConflictResolver[] {
> 			SalienceConflictResolver.getInstance(),
> 			ComplexityConflictResolver.getInstance(),
> 			FifoConflictResolver.getInstance() };
> 	CompositeConflictResolver compositeConflictResolver = new
> CompositeConflictResolver(conflictResolvers);
> 	byte[] bytecode = readRuleFromJar();
> 	
> 	// i can not develope this part also
> 	// RuleBaseLoader loader = new RuleBaseLoader(compositeConflictResolver);
> 	// loader.addFromByteArray(bytecode);
> 	// RuleBase ruleBase = loader.buildRuleBase();
> 	
> 	// modification in code for drools 4.0
> 	// WorkingMemory workingMemory = ruleBase.newWorkingMemory();
> 	WorkingMemory workingMemory = ruleBase.newStatefulSession();
> 	// workingMemory.assertObject(usg);
> 	workingMemory.insert(usg);
> 	workingMemory.fireAllRules();
> }
>