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Drools and jBPM integration for Spring.
/*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* 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.kie.spring.namespace;
import java.util.List;
import org.drools.core.ClockType;
import org.drools.core.SessionConfiguration;
import org.drools.core.command.runtime.SetGlobalCommand;
import org.drools.core.command.runtime.process.SignalEventCommand;
import org.drools.core.command.runtime.process.StartProcessCommand;
import org.drools.core.command.runtime.rule.FireAllRulesCommand;
import org.drools.core.command.runtime.rule.FireUntilHaltCommand;
import org.drools.core.command.runtime.rule.InsertObjectCommand;
import org.kie.spring.factorybeans.KSessionFactoryBean;
import org.kie.spring.factorybeans.helper.StatefulKSessionFactoryBeanHelper;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.ManagedList;
import org.springframework.beans.factory.support.ManagedMap;
import org.springframework.beans.factory.xml.AbstractBeanDefinitionParser;
import org.springframework.beans.factory.xml.ParserContext;
import org.springframework.util.StringUtils;
import org.springframework.util.xml.DomUtils;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import static org.kie.spring.namespace.DefinitionParserHelper.emptyAttributeCheck;
public class KSessionDefinitionParser extends AbstractBeanDefinitionParser {
private static final String ATTRIBUTE_ID = "name";
private static final String ATTRIBUTE_TYPE = "type";
private static final String LISTENERS_REF_ATTRIBUTE = "listeners-ref";
private static final String EMF_ATTRIBUTE = "entity-manager-factory";
private static final String TX_MANAGER_ATTRIBUTE = "transaction-manager";
private static final String FORCLASS_ATTRIBUTE = "for-class";
private static final String IMPLEMENTATION_ATTRIBUTE = "implementation";
private static final String KEEP_REFERENCE = "keep-reference";
private static final String CLOCK_TYPE = "clockType";
private static final String SCOPE = "scope";
private static final String WORK_ITEMS = "work-item-handlers";
private static final String WORK_ITEM = "work-item-handler";
private static final String ID_ATTRIBUTE = "id";
private static final String ATTRIBUTE_DEFAULT = "default";
@SuppressWarnings("unchecked")
@Override
protected AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {
BeanDefinitionBuilder factory = BeanDefinitionBuilder.rootBeanDefinition(KSessionFactoryBean.class);
String id = element.getAttribute(ATTRIBUTE_ID);
emptyAttributeCheck(element.getLocalName(), ATTRIBUTE_ID, id);
factory.addPropertyValue(ATTRIBUTE_ID, id);
element.setAttribute("name", id);
element.setAttribute("id", id);
factory.addPropertyValue("def", element.getAttribute(ATTRIBUTE_DEFAULT));
String type = element.getAttribute(ATTRIBUTE_TYPE);
if (!StringUtils.hasLength(type)){
type = "stateful";
}
factory.addPropertyValue(ATTRIBUTE_TYPE, type);
String scope = element.getAttribute(SCOPE);
if (StringUtils.hasLength(scope)){
factory.addPropertyValue(SCOPE, scope);
} else {
factory.addPropertyValue(SCOPE, "singleton");
}
String clockType = element.getAttribute(CLOCK_TYPE);
if (StringUtils.hasLength(clockType)){
factory.addPropertyValue(CLOCK_TYPE, clockType);
}
String listeners = element.getAttribute(LISTENERS_REF_ATTRIBUTE);
if (StringUtils.hasText(listeners)) {
factory.addPropertyValue("eventListenersFromGroup", new RuntimeBeanReference(listeners));
}
EventListenersUtil.parseEventListeners(parserContext, factory, element);
LoggerUtil.parseRuntimeLoggers(parserContext, factory, element);
Element ksessionConf = DomUtils.getChildElementByTagName(element, "configuration");
parseSessionConf(factory, ksessionConf);
Element batch = DomUtils.getChildElementByTagName(element, "batch");
parseBatch(parserContext, factory, batch);
return factory.getBeanDefinition();
}
private void parseSessionConf(BeanDefinitionBuilder factory, Element ksessionConf) {
if (ksessionConf != null) {
Element persistenceElm = DomUtils.getChildElementByTagName(ksessionConf, "jpa-persistence");
if (persistenceElm != null) {
BeanDefinitionBuilder beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(StatefulKSessionFactoryBeanHelper.JpaConfiguration.class);
String loadId = persistenceElm.getAttribute("load");
if (org.springframework.util.StringUtils.hasText(loadId)) {
beanBuilder.addPropertyValue(ID_ATTRIBUTE, Long.parseLong(loadId));
}
Element tnxMng = DomUtils.getChildElementByTagName(persistenceElm, TX_MANAGER_ATTRIBUTE);
String ref = tnxMng.getAttribute("ref");
beanBuilder.addPropertyReference("platformTransactionManager", ref);
Element emf = DomUtils.getChildElementByTagName(persistenceElm, EMF_ATTRIBUTE);
ref = emf.getAttribute("ref");
beanBuilder.addPropertyReference("entityManagerFactory", ref);
Element variablePersisters = DomUtils.getChildElementByTagName(persistenceElm, "variable-persisters");
if (variablePersisters != null && variablePersisters.hasChildNodes()) {
List childPersisterElems = DomUtils.getChildElementsByTagName(variablePersisters,
"persister");
ManagedMap persistors = new ManagedMap(childPersisterElems.size());
for (Element persisterElem : childPersisterElems) {
String forClass = persisterElem.getAttribute(FORCLASS_ATTRIBUTE);
String implementation = persisterElem.getAttribute(IMPLEMENTATION_ATTRIBUTE);
if (!org.springframework.util.StringUtils.hasText(forClass)) {
throw new RuntimeException("persister element must have valid for-class attribute");
}
if (!org.springframework.util.StringUtils.hasText(implementation)) {
throw new RuntimeException("persister element must have valid implementation attribute");
}
persistors.put(forClass, implementation);
}
beanBuilder.addPropertyValue("variablePersisters", persistors);
}
factory.addPropertyValue("jpaConfiguration", beanBuilder.getBeanDefinition());
}
BeanDefinitionBuilder rbaseConfBuilder = BeanDefinitionBuilder.rootBeanDefinition(SessionConfiguration.class, "newInstance");
Element e = DomUtils.getChildElementByTagName(ksessionConf, KEEP_REFERENCE);
if (e != null && org.springframework.util.StringUtils.hasText(e.getAttribute("enabled"))) {
rbaseConfBuilder.addPropertyValue("keepReference", Boolean.parseBoolean(e.getAttribute("enabled")));
}
e = DomUtils.getChildElementByTagName(ksessionConf, CLOCK_TYPE);
if (e != null && org.springframework.util.StringUtils.hasText(e.getAttribute("type"))) {
rbaseConfBuilder.addPropertyValue("clockType", ClockType.resolveClockType(e.getAttribute("type")));
}
factory.addPropertyValue("conf", rbaseConfBuilder.getBeanDefinition());
e = DomUtils.getChildElementByTagName(ksessionConf, WORK_ITEMS);
if (e != null) {
List children = DomUtils.getChildElementsByTagName(e, WORK_ITEM);
if (children != null && !children.isEmpty()) {
ManagedMap workDefs = new ManagedMap();
for (Element child : children) {
workDefs.put(child.getAttribute("name"), new RuntimeBeanReference(child.getAttribute("ref")));
}
factory.addPropertyValue("workItems", workDefs);
}
}
}
}
private void parseBatch(ParserContext parserContext, BeanDefinitionBuilder factory, Element batch) {
if (batch != null) {
// we know there can only ever be one
ManagedList children = new ManagedList();
for (int i = 0, length = batch.getChildNodes().getLength(); i < length; i++) {
Node n = batch.getChildNodes().item(i);
if (n instanceof Element) {
Element e = (Element) n;
BeanDefinitionBuilder beanBuilder = null;
if ("insert-object".equals(e.getLocalName())) {
String ref = e.getAttribute("ref");
Element nestedElm = getFirstElement(e.getChildNodes());
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(InsertObjectCommand.class);
if (org.springframework.util.StringUtils.hasText(ref)) {
beanBuilder.addConstructorArgReference(ref);
} else if (nestedElm != null) {
beanBuilder.addConstructorArgValue(parserContext.getDelegate().parsePropertySubElement(nestedElm,
null,
null));
} else {
throw new IllegalArgumentException("insert-object must either specify a 'ref' attribute or have a nested bean");
}
} else if ("set-global".equals(e.getLocalName())) {
String ref = e.getAttribute("ref");
Element nestedElm = getFirstElement(e.getChildNodes());
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(SetGlobalCommand.class);
beanBuilder.addConstructorArgValue(e.getAttribute("identifier"));
if (org.springframework.util.StringUtils.hasText(ref)) {
beanBuilder.addConstructorArgReference(ref);
} else if (nestedElm != null) {
beanBuilder.addConstructorArgValue(parserContext.getDelegate().parsePropertySubElement(nestedElm,
null,
null));
} else {
throw new IllegalArgumentException("set-global must either specify a 'ref' attribute or have a nested bean");
}
} else if ("fire-until-halt".equals(e.getLocalName())) {
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(FireUntilHaltCommand.class);
} else if ("fire-all-rules".equals(e.getLocalName())) {
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(FireAllRulesCommand.class);
String max = e.getAttribute("max");
if (org.springframework.util.StringUtils.hasText(max)) {
beanBuilder.addPropertyValue("max", max);
}
} else if ("start-process".equals(e.getLocalName())) {
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(StartProcessCommand.class);
String processId = e.getAttribute("process-id");
if (!org.springframework.util.StringUtils.hasText(processId)) {
throw new IllegalArgumentException("start-process must specify a process-id");
}
beanBuilder.addConstructorArgValue(processId);
List params = DomUtils.getChildElementsByTagName(e, "parameter");
if (!params.isEmpty()) {
ManagedMap map = new ManagedMap();
for (Element param : params) {
String identifier = param.getAttribute("identifier");
if (!org.springframework.util.StringUtils.hasText(identifier)) {
throw new IllegalArgumentException("start-process paramaters must specify an identifier");
}
String ref = param.getAttribute("ref");
Element nestedElm = getFirstElement(param.getChildNodes());
if (org.springframework.util.StringUtils.hasText(ref)) {
map.put(identifier, new RuntimeBeanReference(ref));
} else if (nestedElm != null) {
map.put(identifier, parserContext.getDelegate().parsePropertySubElement(nestedElm,
null,
null));
} else {
throw new IllegalArgumentException("start-process parameters must either specify a 'ref' attribute or have a nested bean");
}
}
beanBuilder.addPropertyValue("parameters", map);
}
} else if ("signal-event".equals(e.getLocalName())) {
beanBuilder = BeanDefinitionBuilder.genericBeanDefinition(SignalEventCommand.class);
String processInstanceId = e.getAttribute("process-instance-id");
if (org.springframework.util.StringUtils.hasText(processInstanceId)) {
beanBuilder.addConstructorArgValue(processInstanceId);
}
beanBuilder.addConstructorArgValue(e.getAttribute("event-type"));
String ref = e.getAttribute("ref");
Element nestedElm = getFirstElement(e.getChildNodes());
if (org.springframework.util.StringUtils.hasText(ref)) {
beanBuilder.addConstructorArgReference(ref);
} else if (nestedElm != null) {
beanBuilder.addConstructorArgValue(parserContext.getDelegate().parsePropertySubElement(nestedElm,
null,
null));
} else {
throw new IllegalArgumentException("signal-event must either specify a 'ref' attribute or have a nested bean");
}
}
if (beanBuilder == null) {
throw new IllegalStateException("Unknow element: " + e.getLocalName());
}
children.add(beanBuilder.getBeanDefinition());
}
}
factory.addPropertyValue("batch", children);
}
}
private Element getFirstElement(NodeList list) {
for (int j = 0, lengthj = list.getLength(); j < lengthj; j++) {
if (list.item(j) instanceof Element) {
return (Element) list.item(j);
}
}
return null;
}
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