Re: [rules-users] Question about Drools Spring, StatelessKnowledgeSession and globals
by Patrick van Kann
Hello fellow Droolers,
A while ago I asked why the <drools:batch> element seemed to work
differently in the case of a StatelessKnowledgeSession and a
StatefulKnowedgeSession (see below).
I just wanted to update those interested with the answer and ask some
further questions, probably aimed at any developers who happen to be
reading.
I checked out the 5.1.1.34858 tag and had a look at how the Spring
integration works. I found that the reason that the global is not set in the
case of a StatelessKnowledgeSession is because the <spring:batch> element is
effectively ignored in the StatelessKnowledgeSessionBeanFactory, which lacks
the following code present in the StatefulKnowledgeSessionBeanFactory (in
the internalAfterPropertiesSet() method):
if ( getBatch() != null && !getBatch().isEmpty()) {
for ( Command<?> cmd : getBatch() ) {
ksession.execute( cmd );
}
}
So, either by accident or design the <spring:batch> element has no effect
when using a StatelessKnowledgeSession (but is perfectly allowable in the
XSD/Spring namespace).
So my questions are:
1) Is this the intended behaviour or a bug? On reflection, I am now not sure
the idea of a "batch/script" makes sense for a StatelessKnowledgeSession
since execute() is a one-shot method and any globals set this way would not
be available to later executions, which is what I was looking for.
2) If so, should the XSD be changed to disallow the batch element within a
stateless session (difficult, given that this is determined via the "type"
attribute) or should the documentation simply warn people that the
<spring:batch> element doesn't do anything if you set the type attribute to
stateless (somewhat confusing, I suppose)
3) If not, should the code above be added to the
StatelessKnowledgeSessionBeanFactory.internalAfterPropertiesSet() method?
4) Should there be another way to declare a global that isn't through the
batch element (one that would cause globals to be set via the
setGlobal(String, Object) method rather than using the SetGlobalCommand via
the execute() method.
I am happy to try and contribute something along these lines if I can get
some guidance as to what was actually intended.
Hope this helps and thanks again for Drools.
Patrick
=====================================
Hello,
I've been trying out the Spring integration package in Drools 5.1.1 and it
works really well, but I have run into one issue I can't figure out.
I've defined 2 knowledge sessions from the same knowledge base in the app
context - one stateless, one stateful but otherwise identical. They both
refer to a collaborator defined as a bean in the app context which is to be
used as a global in my rules. This is just an excerpt of my full Spring
context, the kbase definition itself is not an issue.
<bean id="applicantDao" class="com.acme.app.dao.impl.ApplicantDaoImpl" />
<drools:ksession id="statelessKSession" type="stateless"
name="statelessKSession" kbase="kbase">
<drools:batch>
<drools:set-global identifier="applicantDao" ref="applicantDao" />
</drools:batch>
</drools:ksession>
<drools:ksession id="statefulKSession" type="stateful"
name="statefulKSession" kbase="kbase">
<drools:batch>
<drools:set-global identifier="applicantDao" ref="applicantDao" />
</drools:batch>
</drools:ksession>
The issue is that this configuration works for the stateful but not the
stateless session, in the sense that the stateful session appears to have a
valid reference to the applicantDao object in the Globals object but the
stateless session doesn't.
<at> Test
public void testStatelessGlobal() {
Globals globals = statelessKSession.getGlobals();
Object global = globals.get("applicantDao");
Assert.assertNotNull(global);
}
<at> Test
public void testStatefulGlobal() {
Globals globals = statefulKSession.getGlobals();
Object global = globals.get("applicantDao");
Assert.assertNotNull(global);
}
The first test fails (the global variable is null) but the second passes. No
errors are thrown by Drools during the setup of the Spring container.
What am I doing wrong? Should I be able to define globals in this way for
stateless sessions? The XSD seems to indicate this is a valid configuration,
but it just doesn't work.
Is anyone else working with the Spring integration that can point out my
error here?
Many thanks,
Patrick
13 years, 5 months
Drools as a Webservice
by abhinavgupta
Hi,
I am new to the Drools , i wanted to expose rules as a webservice using
Axis2.
what i have done is that
1. I have created a drools Project (working fine on eclispe) export all
files in jar
2. Placed the jar file in C:\Program Files\Apache Software Foundation\Tomcat
7.0\webapps\axis2\WEB-INF\lib directory
3. Created a new Dynamic java project with axis2 facet.created a class with
**
package in.abhi.ws;
import java.math.BigDecimal;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import com.sample.SaleItem;
public class Test {
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory
.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("KanasSalesTax.drl"),
ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public BigDecimal salesTax(String taxState, String typeItem) {
BigDecimal taxCal = null;
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase
.newStatefulKnowledgeSession();
// Non-prescription item
// Expect $1.89 for the tax
SaleItem item1 = new SaleItem();
item1.setPurchaseState(taxState);
item1.setItemType(typeItem);
item1.setSalesPrice(new BigDecimal(29.95));
ksession.insert(item1);
ksession.fireAllRules();
taxCal = item1.getSalesTax();
System.out.println(item1.getPurchaseState().toString() + " "
+ item1.getItemType().toString() + ": "
+ item1.getSalesTax().toString());
} catch (Throwable t) {
t.printStackTrace();
}
return taxCal;
}
}
**
4. Then created a bottom up java bean webservice of it using the same above
class.
5. Wsdl is generated
i am getting the error response on eclispe console while testing by soap-ui
**********
java.lang.NullPointerException
at
org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215)
at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748)
at
org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87)
at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167)
at
org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721)
at
org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358)
at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369)
at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71)
at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
at in.abhi.ws.Test.readKnowledgeBase(Test.java:31)
at in.abhi.ws.Test.salesTax(Test.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at
org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
at
org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
at
org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at
org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
at
org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215)
at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748)
at
org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87)
at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167)
at
org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721)
at
org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358)
at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369)
at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53)
at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71)
at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37)
at in.abhi.ws.Test.readKnowledgeBase(Test.java:31)
at in.abhi.ws.Test.salesTax(Test.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212)
at
org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117)
at
org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
at
org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at
org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
****************
Please let me know how to make it work
--
View this message in context: http://drools.46999.n3.nabble.com/Drools-as-a-Webservice-tp3950198.html
Sent from the Drools: User forum mailing list archive at Nabble.com.
13 years, 5 months
Drools 5.4.0.FINAL and OSGI. Unable to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'
by Per Sterner
Hello,
I have been using Drools 5.3.0.FINAL until now. I am upgrading my
running system with 5.4.0.FINAL. The bundles are all runing. I got some
error messages and tried to reduce the problem and created a simple bundle.
The code only inserts facts and after 20 facts I get the following error:
[ERROR] [System] - Exception in thread "Thread-8"
java.lang.ExceptionInInitializerError
[ERROR] [System] - at
org.drools.concurrent.ExecutorProviderFactory.getExecutorProvider(ExecutorProviderFactory.java:12)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint$ExecutorHolder.<clinit>(MvelConstraint.java:208)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.jitEvaluator(MvelConstraint.java:199)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:164)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:124)
[ERROR] [System] - at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
[ERROR] [System] - at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
[ERROR] [System] - at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
[ERROR] [System] - at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:123)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:53)
[ERROR] [System] - at
de.pelle7.drools.test1.simpletest.SimpleTestDrools$1.run(SimpleTestDrools.java:74)
[ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable
to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:162)
[ERROR] [System] - at
org.drools.concurrent.ExecutorProviderFactory$ExecutorProviderHolder.<clinit>(ExecutorProviderFactory.java:8)
[ERROR] [System] - ... 14 more
[ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable
to instantiate 'org.drools.concurrent.ExecutorProviderImpl'
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:213)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:205)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:160)
[ERROR] [System] - ... 15 more
[ERROR] [System] - Caused by: java.lang.ClassNotFoundException:
org.drools.concurrent.ExecutorProviderImpl
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
[ERROR] [System] - at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
[ERROR] [System] - at java.lang.ClassLoader.loadClass(Unknown Source)
[ERROR] [System] - at java.lang.Class.forName0(Native Method)
[ERROR] [System] - at java.lang.Class.forName(Unknown Source)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210)
[ERROR] [System] - ... 17 more
The Rule file:
package de.pelle7.drools.test1.users.rules.impl;
import de.pelle7.drools.test1.simpletest.*;
import org.jbpm.ruleflow.instance.*;
rule "Funny Rule #1"
dialect "java"
when
$testObject : TestObjectA( value == 0 ) from entry-point "my_entry"
then
System.err.println("New Item: " + $testObject);
retract($testObject);
end
If I change the line
--> $testObject : TestObjectA( value == 0 ) from entry-point "my_entry"
to
--> $testObject : TestObjectA( ) from entry-point "my_entry"
there is no problem.
In the java code i initialize a Drools Session programatically and add
one rule file:
package de.pelle7.drools.test1.simpletest;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactoryService;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderConfiguration;
import org.drools.builder.KnowledgeBuilderFactoryService;
import org.drools.builder.ResourceType;
import org.drools.definition.KnowledgePackage;
import org.drools.io.ResourceFactory;
import org.drools.io.ResourceFactoryService;
import org.drools.runtime.StatefulKnowledgeSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SimpleTestDrools {
public static final String DEFAULT_ENTRY = "my_entry";
private static Logger logger =
LoggerFactory.getLogger(SimpleTestDrools.class);
private StatefulKnowledgeSession droolsSession;
private KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService;
private ResourceFactoryService droolsResourceFactoryService;
private KnowledgeBaseFactoryService droolsKnowledgeBaseFactoryService;
public static Logger getLogger() {
return logger;
}
public StatefulKnowledgeSession getDroolsSession() {
return droolsSession;
}
public void start() {
KnowledgeBuilder kbuilder =
getDroolsKnowledgeBuilderFactoryService().newKnowledgeBuilder();
KnowledgeBaseConfiguration config =
getDroolsKnowledgeBaseFactoryService().newKnowledgeBaseConfiguration();
//config.setOption( MBeansOption.ENABLED );
KnowledgeBase knowledgeBase =
getDroolsKnowledgeBaseFactoryService().newKnowledgeBase(config);
droolsSession = knowledgeBase.newStatefulKnowledgeSession();
LinkedList<URI> resourcesList = new LinkedList<URI>();
try {
resourcesList.add(
getClass().getResource("MyDrools.drl").toURI() );
addResources(droolsSession,
getDroolsKnowledgeBuilderFactoryService(),
resourcesList);
} catch (Exception e) {
e.printStackTrace();
}
new Thread() {
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
System.out.println("Go 1");
for (int i = 0; i< 1000; i++) {
System.out.println(i);
getDroolsSession().getWorkingMemoryEntryPoint(DEFAULT_ENTRY).insert(new
TestObjectA());
getDroolsSession().fireAllRules();
try {
Thread.sleep(1);
} catch (InterruptedException e) {
}
}
System.out.println("Go 2");
};
}.start();
System.err.println("wait");
//getDroolsSession().fireUntilHalt();
}
public static void addResources(
StatefulKnowledgeSession droolsSession,
KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService,
List<URI> resources
) throws MyDroolsException {
getLogger().debug("Drools: Register: " + resources);
MyDroolsException exception = null;
KnowledgeBuilderConfiguration lnowledgeBuilderConfiguration =
droolsKnowledgeBuilderFactoryService.newKnowledgeBuilderConfiguration();
HashSet<URI> defects = new HashSet<URI>();
KnowledgeBuilder kbuilder = null;
while (true) {
URI uriError = null;
kbuilder =
droolsKnowledgeBuilderFactoryService.newKnowledgeBuilder(lnowledgeBuilderConfiguration);
try {
Iterator<URI> it = resources.iterator();
while (it.hasNext()) {
URI uri = (URI) it.next();
if (defects.contains(uri)) {
continue;
}
StringBuilder builder = new StringBuilder();
builder.append("Adding drools file '" +
uri.toString() + "'");
URL url = uri.toURL();
InputStream iStream = url.openStream();
ResourceType resourceType;
String path = uri.getPath().toLowerCase();
resourceType =
ResourceType.determineResourceType(path);
getLogger().debug(builder.toString());
kbuilder.add(ResourceFactory.newInputStreamResource(iStream), resourceType);
// Check the builder for errors
if (kbuilder.hasErrors()) {
uriError = uri;
//getLogger().error(kbuilder.getErrors().toString());
String errorMessage =
kbuilder.getErrors().toString();
kbuilder.getErrors().clear();
throw new MyDroolsException(errorMessage);
}
try {
iStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Throwable e) {
if (uriError != null) {
defects.add(uriError);
}
String msg = "Error in Resource '" + uriError + "'";
getLogger().error(msg);
e.printStackTrace();
if (exception != null) {
exception = new MyDroolsException(msg, exception);
} else {
exception = new MyDroolsException(msg);
}
exception = new MyDroolsException(e.getMessage(),
exception);
continue;
}
// All done!
break;
}
final Collection<KnowledgePackage> pkgs =
kbuilder.getKnowledgePackages();
droolsSession.getKnowledgeBase().addKnowledgePackages(pkgs);
if (exception != null) {
throw new MyDroolsException("Error while adding
resources!", exception);
}
}
public KnowledgeBuilderFactoryService
getDroolsKnowledgeBuilderFactoryService() {
return droolsKnowledgeBuilderFactoryService;
}
public void setDroolsKnowledgeBuilderFactoryService(
KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService) {
this.droolsKnowledgeBuilderFactoryService =
droolsKnowledgeBuilderFactoryService;
}
public ResourceFactoryService getDroolsResourceFactoryService() {
return droolsResourceFactoryService;
}
public void setDroolsResourceFactoryService(
ResourceFactoryService droolsResourceFactoryService) {
this.droolsResourceFactoryService = droolsResourceFactoryService;
}
public KnowledgeBaseFactoryService
getDroolsKnowledgeBaseFactoryService() {
return droolsKnowledgeBaseFactoryService;
}
public void setDroolsKnowledgeBaseFactoryService(
KnowledgeBaseFactoryService
droolsKnowledgeBaseFactoryService) {
this.droolsKnowledgeBaseFactoryService =
droolsKnowledgeBaseFactoryService;
}
}
Some of the bundles in my runtime are:
39 ACTIVE org.drools.core_5.4.0.Final
66 ACTIVE org.drools.compiler_5.4.0.Final
78 ACTIVE org.drools.templates_5.4.0.Final
94 ACTIVE org.drools.internalapi_5.4.0.Final
136 ACTIVE org.drools.decisiontables_5.4.0.Final
189 ACTIVE org.drools.api_5.4.0.Final
191 ACTIVE org.mvel2_2.1.0.drools16
6 ACTIVE org.jbpm.flow.core_5.3.0.Final
13 ACTIVE org.jbpm.bpmn2_5.3.0.Final
71 ACTIVE org.jbpm.flow.builder_5.3.0.Final
142 ACTIVE org.jbpm.flow-persistence-jpa_5.3.0.FINAL
regards,
Per Sterner
13 years, 5 months
Change Scanner does not start
by Antonio Anderson Souza
Dear All,
I have an application that use Guvnor 5.4.0 final as the rules repository
and a DroolsServer 5.4.0 final (with Spring Camel) to provide rule engine
via a Rest Webservices, all of those apps Running in a JBossAS 7.1.
All of the service are working perfectly, except the
resource-change-scanner that is configured in the knowledge-services.xml
[1] as it's described in the documentation.
When Drools-Server are deployed the Change Scanner does not start (I'm
monitoring the change scanner via Wireshark analyzing the communication
between DroolServer and Guvnor), I've created an small JSP file [2] that
invoke the ChangeScanner start method, when i run the JSP the Change
Scanner start to work (i can see the http requests from Drools Server do
Guvnor to see if the knowledge base had changed), but after Change Scanner
started working the rules are not triggered anymore.
So without Change Scanner I've all of the knowledge service running
properly, but the App is unable to detect rules changes, when I explicitly
(via JSP) start the Change Scanner all of the knowledge service stopped
working.
Change Scanner starts automatically?
Does anybody has some idea to help me?
[1] ------------------------------------------------------------------------
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:drools="http://drools.org/schema/drools-spring"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://drools.org/schema/drools-spring
http://drools.org/schema/drools-spring-1.3.0.xsd">
<drools:grid-node id="node1"/>
<drools:resource-change-scanner id="scanner" interval="10" />
<drools:kbase id="kbase1" node="node1" />
<drools:kagent id="kagent1" kbase="kbase1">
<drools:resources>
<drools:resource type="CHANGE_SET" source="classpath:ChangeSet.xml" />
</drools:resources>
</drools:kagent>
<drools:ksession id="ksession1" type="stateless" kbase="kbase1"
node="node1"/>
</beans>
[2] ------------------------------------------------------------------------
<%@ page language="java" contentType="text/html; charset=utf-8" %>
<%
org.drools.io.ResourceChangeScannerConfiguration sconf =
org.drools.io.ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
sconf.setProperty("drools.resource.scanner.interval", "5");
org.drools.io.ResourceFactory.getResourceChangeScannerService().configure(sconf);
org.drools.io.ResourceFactory.getResourceChangeScannerService().start();
org.drools.io.ResourceFactory.getResourceChangeNotifierService().start();
%>
Best Regards,
Antonio Anderson Souza
<http://174.129.217.139:8080/makecallclient/callme?p=YXNvdXphQHZvaWNlLmJyY...>
Blog <http://www.antonioams.com> - Twitter <http://twitter.com/antonioams>-
LinkedIn <http://br.linkedin.com/in/antonioams> -
Facebook<http://www.facebook.com/antonioams>
13 years, 5 months
Drools: Using Declared Types in Decision Tables
by David Smith
Hi,
I am trying to use a declared type in a decision table
but get an "Unable to resolve ObjectType" message.
The declared type is in a file types.drl,
I have a spreadsheet test.xls that has a Ruleset with
an import line for the declared type.
Is it possible to reference a declared type from a decision table?
Is it possible to declare a type in a decision table?
Thanks
David
13 years, 5 months
Stateless session dis-associating listeners after first execute call. Bug or a feature?
by Michal Bali
Hello,
I am using a stateless session. First I add an agenda event listener. When
I first call session.execute(Itelable) all works as expected. However when
I call it the second time (without adding the listener again) the listener
does not seem to be called at all.
However note that when I call session.getAgendaEventListeners() the event
listener is always there.
IMHO I am guessing that the 'dispose' method that is called behind the
scenes possibly dis-associates the event listener.
I've tested this with 5.5.Final. BTW This worked fine with Drools 5.0. I
haven't checked later versions.
I wonder is this a bug or a feature?
Isolated test case is attached.
Thank you.
Best regards,
Michal
13 years, 5 months
How to determine Drools runtime version?
by Ansgar Konermann
Hi,
I'd like to determine at runtime which version of Drools is in use/on
the classpath. I cannot use reflection on the Drools classes itself, as
this will not work in the intended runtime environment (Google App Engine).
The following code works in a normal Java VM, but not in GAE:
Package droolsCorePackage = KnowledgePackageImp.class.getPackage();
String implementationTitle = droolsCorePackage.getImplementationTitle();
String implementationVersion =
droolsCorePackage.getImplementationVersion();
In GAE, the getImplementation{Title|Version} methods both return null.
Is there another, maybe more "official" way of determining the Drools
version? I'd like to support Drools 5.x.y starting at x >= 3.
Best regards
Ansgar
13 years, 5 months
