package org.drools.persistence.processinstance;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.persistence.EntityManager;
import org.drools.WorkingMemory;
import org.drools.process.instance.ProcessInstance;
import org.drools.process.instance.WorkItem;
import org.drools.process.instance.WorkItemManager;
import org.drools.process.instance.impl.WorkItemImpl;
import org.drools.runtime.Environment;
import org.drools.runtime.EnvironmentName;
import org.drools.runtime.process.WorkItemHandler;
public class JPAWorkItemManager implements WorkItemManager {
private WorkingMemory workingMemory;
private Map<String, WorkItemHandler> workItemHandlers = new HashMap<String, WorkItemHandler>();
private transient Map<Long, WorkItemInfo> workItems;
public JPAWorkItemManager(WorkingMemory workingMemory) {
this.workingMemory = workingMemory;
}
public void internalExecuteWorkItem(WorkItem workItem) {
Environment env = this.workingMemory.getEnvironment();
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = new WorkItemInfo(workItem, env);
em.persist(workItemInfo);
((WorkItemImpl) workItem).setId(workItemInfo.getId());
workItemInfo.update();
if (this.workItems == null) {
this.workItems = new HashMap<Long, WorkItemInfo>();
}
workItems.put(workItem.getId(), workItemInfo);
WorkItemHandler handler = (WorkItemHandler) this.workItemHandlers.get(workItem.getName());
if (handler != null) {
handler.executeWorkItem(workItem, this);
} else {
System.err.println("Could not find work item handler for " + workItem.getName());
}
}
public void internalAbortWorkItem(long id) {
Environment env = this.workingMemory.getEnvironment();
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = em.find(WorkItemInfo.class, id);
// work item may have been aborted
if (workItemInfo != null) {
WorkItemImpl workItem = (WorkItemImpl) workItemInfo.getWorkItem(env);
WorkItemHandler handler = (WorkItemHandler) this.workItemHandlers.get(workItem.getName());
if (handler != null) {
handler.abortWorkItem(workItem, this);
} else {
System.err.println("Could not find work item handler for " + workItem.getName());
}
if (workItems != null) {
workItems.remove(id);
}
em.remove(workItemInfo);
}
}
public void internalAddWorkItem(WorkItem workItem) {
}
public void completeWorkItem(long id, Map<String, Object> results) {
Environment env = this.workingMemory.getEnvironment();
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
if (workItemInfo != null) {
workItemInfo = em.merge(workItemInfo);
}
}
if (workItemInfo == null) {
workItemInfo = em.find(WorkItemInfo.class, id);
}
// work item may have been aborted
if (workItemInfo != null) {
WorkItem workItem = (WorkItemImpl) workItemInfo.getWorkItem(env);
workItem.setResults(results);
ProcessInstance processInstance = workingMemory.getProcessInstance(workItem.getProcessInstanceId());
workItem.setState(WorkItem.COMPLETED);
// process instance may have finished already
if (processInstance != null) {
processInstance.signalEvent("workItemCompleted", workItem);
}
em.remove(workItemInfo);
if (workItems != null) {
this.workItems.remove(workItem.getId());
}
workingMemory.fireAllRules();
}
}
public void abortWorkItem(long id) {
Environment env = this.workingMemory.getEnvironment();
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
em.merge(workItemInfo);
}
if (workItemInfo == null) {
workItemInfo = em.find(WorkItemInfo.class, id);
}
// work item may have been aborted
if (workItemInfo != null) {
WorkItem workItem = (WorkItemImpl) workItemInfo.getWorkItem(env);
ProcessInstance processInstance = workingMemory.getProcessInstance(workItem.getProcessInstanceId());
workItem.setState(WorkItem.ABORTED);
// process instance may have finished already
if (processInstance != null) {
processInstance.signalEvent("workItemAborted", workItem);
}
em.remove(workItemInfo);
if (workItems != null) {
workItems.remove(workItem.getId());
}
workingMemory.fireAllRules();
}
}
public WorkItem getWorkItem(long id) {
Environment env = this.workingMemory.getEnvironment();
EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
}
if (workItemInfo == null && em != null) {
workItemInfo = em.find(WorkItemInfo.class, id);
}
if (workItemInfo == null) {
return null;
}
return workItemInfo.getWorkItem(env);
}
public Set<WorkItem> getWorkItems() {
return new HashSet<WorkItem>();
}
public void registerWorkItemHandler(String workItemName, WorkItemHandler handler) {
this.workItemHandlers.put(workItemName, handler);
}
public void clearWorkItems() {
if (workItems != null) {
workItems.clear();
}
}
}