/**
* Copyright 2010 JBoss Inc
*
* 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.drools.integration.console;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.definition.KnowledgePackage;
import org.drools.definition.process.Process;
import org.drools.io.ResourceFactory;
import org.drools.persistence.jpa.JPAKnowledgeService;
import org.drools.process.audit.ProcessInstanceDbLog;
import org.drools.process.audit.ProcessInstanceLog;
import org.drools.process.audit.WorkingMemoryDbLogger;
import org.drools.process.core.context.variable.VariableScope;
import org.drools.process.instance.context.variable.VariableScopeInstance;
import org.drools.process.workitem.wsht.CommandBasedWSHumanTaskHandler;
import org.drools.runtime.Environment;
import org.drools.runtime.EnvironmentName;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.process.ProcessInstance;
import org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl;
public class DroolsFlowCommandDelegate {
private static StatefulKnowledgeSession ksession;
public DroolsFlowCommandDelegate() {
getSession();
}
private StatefulKnowledgeSession newStatefulKnowledgeSession() {
try {
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("Guvnor default");
kagent.applyChangeSet(ResourceFactory.newClassPathResource("ChangeSet.xml"));
kagent.monitorResourceChangeEvents(false);
KnowledgeBase kbase = kagent.getKnowledgeBase();
StatefulKnowledgeSession ksession = null;
EntityManagerFactory emf = Persistence.createEntityManagerFactory(
"org.drools.persistence.jpa");
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
try {
System.out.println("Loading session data ...");
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(
1, kbase, null, env);
} catch (RuntimeException e) {
System.out.println("Error loading session data: " + e.getMessage());
if (e instanceof IllegalStateException) {
Throwable cause = ((IllegalStateException) e).getCause();
if (cause instanceof InvocationTargetException) {
cause = cause.getCause();
if (cause != null && "Could not find session data for id 1".equals(cause.getMessage())) {
System.out.println("Creating new session data ...");
ksession = JPAKnowledgeService.newStatefulKnowledgeSession(
kbase, null, env);
} else {
System.err.println("Error loading session data: " + cause);
throw e;
}
} else {
System.err.println("Error loading session data: " + cause);
throw e;
}
} else {
System.err.println("Error loading session data: " + e.getMessage());
throw e;
}
}
new WorkingMemoryDbLogger(ksession);
CommandBasedWSHumanTaskHandler handler = new CommandBasedWSHumanTaskHandler(ksession);
ksession.getWorkItemManager().registerWorkItemHandler(
"Human Task", handler);
handler.connect();
System.out.println("Successfully loaded default package from Guvnor");
return ksession;
} catch (Throwable t) {
throw new RuntimeException(
"Could not initialize stateful knowledge session: "
+ t.getMessage(), t);
}
}
private StatefulKnowledgeSession getSession() {
if (ksession == null) {
ksession = newStatefulKnowledgeSession();
}
return ksession;
}
public List<Process> getProcesses() {
List<Process> result = new ArrayList<Process>();
for (KnowledgePackage kpackage: getSession().getKnowledgeBase().getKnowledgePackages()) {
result.addAll(kpackage.getProcesses());
}
return result;
}
public Process getProcess(String processId) {
for (KnowledgePackage kpackage: getSession().getKnowledgeBase().getKnowledgePackages()) {
for (Process process: kpackage.getProcesses()) {
if (processId.equals(process.getId())) {
return process;
}
}
}
return null;
}
public Process getProcessByName(String name) {
for (KnowledgePackage kpackage: getSession().getKnowledgeBase().getKnowledgePackages()) {
for (Process process: kpackage.getProcesses()) {
if (name.equals(process.getName())) {
return process;
}
}
}
return null;
}
public void removeProcess(String processId) {
throw new UnsupportedOperationException();
}
public ProcessInstanceLog getProcessInstanceLog(String processInstanceId) {
return ProcessInstanceDbLog.findProcessInstance(new Long(processInstanceId));
}
public List<ProcessInstanceLog> getProcessInstanceLogsByProcessId(String processId) {
return ProcessInstanceDbLog.findProcessInstances(processId);
}
public ProcessInstanceLog startProcess(String processId, Map<String, Object> parameters) {
long processInstanceId = ksession.startProcess(processId, parameters).getId();
return ProcessInstanceDbLog.findProcessInstance(processInstanceId);
}
public void abortProcessInstance(String processInstanceId) {
ProcessInstance processInstance = ksession.getProcessInstance(new Long(processInstanceId));
if (processInstance != null) {
ksession.abortProcessInstance(new Long(processInstanceId));
} else {
throw new IllegalArgumentException("Could not find process instance " + processInstanceId);
}
}
public Map<String, Object> getProcessInstanceVariables(String processInstanceId) {
ProcessInstance processInstance = ksession.getProcessInstance(new Long(processInstanceId));
if (processInstance != null) {
Map<String, Object> variables =
((WorkflowProcessInstanceImpl) processInstance).getVariables();
if (variables == null) {
return new HashMap<String, Object>();
}
// filter out null values
Map<String, Object> result = new HashMap<String, Object>();
for (Map.Entry<String, Object> entry: variables.entrySet()) {
if (entry.getValue() != null) {
result.put(entry.getKey(), entry.getValue());
}
}
return result;
} else {
throw new IllegalArgumentException("Could not find process instance " + processInstanceId);
}
}
public void setProcessInstanceVariables(String processInstanceId, Map<String, Object> variables) {
ProcessInstance processInstance = ksession.getProcessInstance(new Long(processInstanceId));
if (processInstance != null) {
VariableScopeInstance variableScope = (VariableScopeInstance)
((org.drools.process.instance.ProcessInstance) processInstance)
.getContextInstance(VariableScope.VARIABLE_SCOPE);
if (variableScope == null) {
throw new IllegalArgumentException(
"Could not find variable scope for process instance " + processInstanceId);
}
for (Map.Entry<String, Object> entry: variables.entrySet()) {
variableScope.setVariable(entry.getKey(), entry.getValue());
}
} else {
throw new IllegalArgumentException("Could not find process instance " + processInstanceId);
}
}
public void signalExecution(String executionId, String signal) {
ksession.getProcessInstance(new Long(executionId))
.signalEvent("signal", signal);
}
}