In Drools, I created a drl file with the following content:
import com.myorg.model.UserAccount;
import function com.myorg.utils.UserAccountHelper.getAmount;
rule "Classification userC"
when
$user : UserAccount(_age < 50);
$amount: getAmount($user, "single");
then
$user.set_userClassification("userC");
end
in Java I have a static method UserAccountHelper.getAmount
public static double getAmount(UserAccount account, String status)
{
double amount = 0d;
switch(status)
{
case "single":
if (account.canBeFullyRefunded)
amount = 1000;
else
amount = 100;
default:
amount = 0d;
}
return amount;
}
I am getting an Exception "Unable to resolve ObjectType 'getAmount'" when validating the drl file.Someone can help?
I am using Drools 7.37.
That's not the way you invoke static methods of a class in DRL. I would recommend you to take a look at the documentation to understand the syntax better.
If you want to invoke a static (or instance) method in a Pattern, you can do it like this:
rule "Classification userC"
when
$user : UserAccount(
_age < 50,
$amount: getAmount(this, "single")
)
then
$user.set_userClassification("userC");
end
Related
There is a procedure in %Dictionary.ClassDefinitionQuery which lists a class summary; in Java I call it like this:
public void readClasses(final Path dir)
throws SQLException
{
final String call
= "{ call %Dictionary.ClassDefinitionQuery_Summary() }";
try (
final CallableStatement statement = connection.prepareCall(call);
final ResultSet rs = statement.executeQuery();
) {
String className;
int count = 0;
while (rs.next()) {
// Skip if System is not 0
if (rs.getInt(5) != 0)
continue;
className = rs.getString(1);
// Also skip if the name starts with a %
if (className.charAt(0) == '%')
continue;
//System.out.println(className);
count++;
}
System.out.println("read: " + count);
}
}
In namespace SAMPLES this returns 491 rows.
I try and replicate it with a pure SQL query like this:
private void listClasses(final Path dir)
throws SQLException
{
final String query = "select id, super"
+ " from %Dictionary.ClassDefinition"
+ " where System = '0' and name not like '\\%%' escape '\\'";
try (
final PreparedStatement statement
= connection.prepareStatement(query);
final ResultSet rs = statement.executeQuery();
) {
int count = 0;
while (rs.next()) {
//System.out.println(rs.getString(1) + ';' + rs.getString(2));
count++;
}
System.out.println("list: " + count);
}
}
Yet when running the program I get this:
list: 555
read: 491
Why are the results different?
I have looked at the code of %Dictionary.ClassDefinitionQuery but I don't understand why it gives different results... All I know, if I store the names in sets and compare, is that:
nothing is missing from list that is in read;
most, but not all, classes returned by list which are not in read are CSP pages.
But that's it.
How I can I replicate the behaviour of the summary procedure in SQL?
Different is in one property. %Dictionary.ClassDefinitionQuery_Summary shows only classes with Deployed<>2. So, sql must be such.
select id,super from %Dictionary.ClassDefinition where deployed <> 2
But one more things is, why count may be different is, such sql requests may be compilled to temporary class, for example "%sqlcq.SAMPLES.cls22"
I'm stuck with BRL rules in Guvnor.. I'm trying to execute rules from my application using Drools Server (this solution because in production I can use more server and maybe improve performance.. Not sure about this as it's the first time that in my company we are using Drools)..
So basically the rule is .. Given an object Route setting the property "selectedOutboundJourney" that I uploaded in guvnor in a jar, I'd like to get another object with the property "selectedReturnJourney" set.. (but Is it possible to get the same object??)
Actually I get a Route object where the selectedReturnJourney is null.
I'm not sure if using BRL is a good solution given the troubles that I'm having.. It seems easy to use for non technical people that may want to change the rules or creating new ones.
Anyway..
This is the BRL that I created in Guvnor:
rule "Selected Return for Dover - Calais"
dialect "mvel"
when
Route( selectedOutboundJourney == "DOCA" )
then
Route fact0 = new Route();
fact0.setSelectedReturnJourney( "CADO" );
insertLogical( fact0 );
end
This is the code I'm using:
final List<Command> commands = new ArrayList<Command>();
final Command insertObjectCommand = CommandFactory.newInsert(input, RESULT, true, "default");
final Command getObjectCommand = CommandFactory.newGetObjects();
final Command fireAllRulesCommand = CommandFactory.newFireAllRules();
commands.add(insertObjectCommand);
commands.add(getObjectCommand);
commands.add(fireAllRulesCommand);
final ExecutionResults executionResults = droolsHttpClient.callDroolsServer(commands);
return executionResults.getValue(RESULT);
The class DroolsHttpClient is:
public ExecutionResults callDroolsServer(final List<Command> commands) throws DroolsException
{
PostMethod postMethod = null;
try
{
final HttpClient httpClient = new HttpClient();
final String droolsServerHost = Config.getString(PoferriesrulesengineConstants.DROOLS_SERVER_HOST, "");
final int droolsServerPort = Config.getInt(PoferriesrulesengineConstants.DROOLS_SERVER_PORT, 0);
httpClient.getHostConfiguration().setHost(droolsServerHost, droolsServerPort);
final String droolsServerUrl = Config.getString(PoferriesrulesengineConstants.DROOLS_SERVER_URL, "");
postMethod = new PostMethod(droolsServerUrl);
final BatchExecutionCommand command = CommandFactory.newBatchExecution(commands, PoferriesrulesengineConstants.DROOLS_SESSION);
final XStream xStreamMarshaller = BatchExecutionHelper.newXStreamMarshaller();
final String xmlCommand = xStreamMarshaller.toXML(command);
final StringRequestEntity request = new StringRequestEntity(xmlCommand, MediaType.TEXT_PLAIN_VALUE, CharEncoding.UTF_8);
postMethod.setRequestEntity(request);
httpClient.executeMethod(postMethod);
if (postMethod.getStatusCode() != 200)
{
throw new RuntimeException("Drools Communication Error, code: " + postMethod.getStatusCode());
}
final String response = postMethod.getResponseBodyAsString();
final ExecutionResults executionResults = (ExecutionResults) xStreamMarshaller.fromXML(response);
return executionResults;
}
catch (final Exception e)
{
throw new DroolsException(e.getMessage());
}
finally
{
postMethod.releaseConnection();
}
}
If I use a DRL like below it words perfectly without using the getObjectCommand:
rule "Selected Return Routes for Dover Calais"
when
r : Route(selectedOutboundJourney == "DOCA")
then
r.setSelectedReturnJourney("CADO")
end
Can anyone help me out, please?
Assuming you only have one fact in your Knowledge Session at the start, after the execution of the following rule
rule "Selected Return for Dover - Calais"
dialect "mvel"
when
Route( selectedOutboundJourney == "DOCA" )
then
Route fact0 = new Route()
fact0.setSelectedReturnJourney( "CADO" )
insert( fact0 )
end
you will have two Route facts in your session, since you just have inserted the second one.
Route: selectedOutboundJourney = "DOCA", selectedReturnJourney=null
Route: selectedOutboundJourney = null, selectedReturnJourney="DACO"
If you want to modify the original fact use the following rule:
rule "Selected Return Routes for Dover Calais"
when
$r : Route(selectedOutboundJourney == "DOCA")
then
modify ($r) {
selectedReturnJourney = "CADO"
}
end
From the following previous question (AspectJ - Presence of annotation in join point expression not recognized),
My goal:
In an aspect, i'd like to be able to extract/retrieve all annotated parameters from matching functions, no matter how many there are. (and then apply some treatment on but it's not the scope of this question)
So for the moment, this is what i did (not working):
#Before("execution (* org.xx.xx.xx..*.*(#org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
Object[] myArgs = jp.getArgs();
getLogger().info("Here: arg length=" + myArgs.length);
// Roll on join point arguments
for (Object myParam : myArgs) {
getLogger().info(
"In argument with " + myParam.getClass().getAnnotations().length
+ " declaread annotations");
getLogger().info("Class name is " + myParam.getClass().getName());
// Get only the one matching the expected #Standardized annotation
if (myParam.getClass().getAnnotation(Standardized.class) != null) {
getLogger().info("Found parameter annotated with #Standardized");
standardizeData(myParam.getClass().getAnnotation(Standardized.class), myParam);
}
}
}
This is the code matched by the advice:
public boolean insertLog(#Standardized(type = StandardizedData.CLIPON) CliponStat theStat) {
// ...
}
And the traces generated by a junit test:
INFO: ICI: arg lenght=1
INFO: In argument with 0 declaread annotations
Looks like it doesn't detect the annotation
So my question is: how to detect parameters which have specific annotation(s) ?
Does somebody have an idea how to do it?
Thanks in advance for your help.
Regards.
Edit: i found this thread Pointcut matching methods with annotated parameters, discussing of the same thing, and applied the given solution but it doesn't work..
I hope I understand you right.
myParam.getClass().getAnnotations() gives you the annotations on a class. Something like:
#Standardized(type = StandardizedData.CLIPON)
public class Main{...}
Maybe this pointcut/advice helps you:
#Before("execution (* org.xx.xx.xx..*.*(#org.xx.xx.xx.xx.xx.Standardized (*),..))")
public void standardize(JoinPoint jp) throws Throwable {
Object[] args = jp.getArgs();
MethodSignature ms = (MethodSignature) jp.getSignature();
Method m = ms.getMethod();
Annotation[][] parameterAnnotations = m.getParameterAnnotations();
for (int i = 0; i < parameterAnnotations.length; i++) {
Annotation[] annotations = parameterAnnotations[i];
System.out.println("I am checking parameter: " + args[i]);
for (Annotation annotation : annotations) {
System.out.println(annotation);
if (annotation.annotationType() == Standardized.class) {
System.out.println("we have a Standardized Parameter with type = "
+ ((Standardized) annotation).type());
}
}
}
}
This gives me the following output:
I am checking parameter: main.CliponStat#331f2ee1
#annotation.Standardized(type=CLIPON)
we have a Standardized Parameter with type = CLIPON
I have found a few articles like this one:
http://devtoolshed.com/using-stored-procedures-entity-framework-scalar-return-values
Yet when I take the step to create a function import for a int32 scalar, this is what gets generated:
public ObjectResult<Nullable<global::System.Int32>> MyStoredProcedure(Nullable<global::System.Int32> orderId)
{
ObjectParameter orderIdParameter;
if (orderId.HasValue)
{
orderIdParameter = new ObjectParameter("OrderId", orderId);
}
else
{
orderIdParameter = new ObjectParameter("OrderId", typeof(global::System.Int32));
}
return base.ExecuteFunction<Nullable<global::System.Int32>>("MyStoredProcedure", orderIdParameter);
}
I am able to call the procedure with this, but am not able to get to the underlying scalar:
ObjectResult<int?> result = myEntities.MyProcedure(orderId);
In the code examples I have seen, I should get context.MyProcedure().SingleOrDefault().
Try this:
int? result = myEntities.MyProcedure(orderId).FirstOrDefault();
Here is code of very simple expression evaluator using IronRuby
public class BasicRubyExpressionEvaluator
{
ScriptEngine engine;
ScriptScope scope;
public Exception LastException
{
get; set;
}
private static readonly Dictionary<string, ScriptSource> parserCache = new Dictionary<string, ScriptSource>();
public BasicRubyExpressionEvaluator()
{
engine = Ruby.CreateEngine();
scope = engine.CreateScope();
}
public object Evaluate(string expression, DataRow context)
{
ScriptSource source;
parserCache.TryGetValue(expression, out source);
if (source == null)
{
source = engine.CreateScriptSourceFromString(expression, SourceCodeKind.SingleStatement);
parserCache.Add(expression, source);
}
var result = source.Execute(scope);
return result;
}
public void SetVariable(string variableName, object value)
{
scope.SetVariable(variableName, value);
}
}
and here is problem.
var evaluator = new BasicRubyExpressionEvaluator();
evaluator.SetVariable("a", 10);
evaluator.SetVariable("b", 1 );
evaluator.Evaluate("a+b+2", null);
vs
var evaluator = new BasicRubyExpressionEvaluator();
evaluator.Evaluate("10+1+2", null);
First Is 25 times slower than second. Any suggestions? String.Replace is not a solution for me.
I do not think the performance you are seeing is due to variable setting; the first execution of IronRuby in a program is always going to be slower than the second, regardless of what you're doing, since most of the compiler isn't loaded in until code is actually run (for startup performance reasons). Please try that example again, maybe running each version of your code in a loop, and you'll see the performance is roughly equivalent; the variable-version does have some overhead of method-dispatch to get the variables, but that should be negligible if you run it enough.
Also, in your hosting code, how come you are holding onto ScriptScopes in a dictionary? I would hold onto CompiledCode (result of engine.CreateScriptSourceFromString(...).Compile()) instead -- as that will help a lot more in repeat runs.
you can of course first build the string something like
evaluator.Evaluate(string.format("a={0}; b={1}; a + b + 2", 10, 1))
Or you can make it a method
if instead of your script you return a method then you should be able to use it like a regular C# Func object.
var script = #"
def self.addition(a, b)
a + b + 2
end
"
engine.ExecuteScript(script);
var = func = scope.GetVariable<Func<object,object,object>>("addition");
func(10,1)
This is probably not a working snippet but it shows the general idea.