package org.drools.persistence.jpa.processinstance;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.persistence.EntityManager;
import org.drools.WorkItemHandlerNotFoundException;
import org.drools.common.InternalKnowledgeRuntime;
import org.drools.persistence.PersistenceContext;
import org.drools.persistence.PersistenceContextManager;
import org.drools.persistence.info.WorkItemInfo;
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.ProcessInstance;
import org.drools.runtime.process.WorkItemHandler;
public class JPAWorkItemManager implements WorkItemManager {
private InternalKnowledgeRuntime kruntime;
private Map<String, WorkItemHandler> workItemHandlers = new HashMap<String, WorkItemHandler>();
private transient Map<Long, WorkItemInfo> workItems;
public JPAWorkItemManager(InternalKnowledgeRuntime kruntime) {
this.kruntime = kruntime;
}
public void internalExecuteWorkItem(WorkItem workItem) {
Environment env = this.kruntime.getEnvironment();
// EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
WorkItemInfo workItemInfo = new WorkItemInfo(workItem, env);
// em.persist(workItemInfo);
PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
context.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 {
throwWorkItemNotFoundException( workItem );
}
}
private void throwWorkItemNotFoundException(WorkItem workItem) {
throw new WorkItemHandlerNotFoundException( "Could not find work item handler for " + workItem.getName(),
workItem.getName() );
}
public void internalAbortWorkItem(long id) {
Environment env = this.kruntime.getEnvironment();
//EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
WorkItemInfo workItemInfo = context.findWorkItemInfo( 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 {
if ( workItems != null ) {
workItems.remove( id );
throwWorkItemNotFoundException( workItem );
}
}
if (workItems != null) {
workItems.remove(id);
}
context.remove(workItemInfo);
}
}
public void internalAddWorkItem(WorkItem workItem) {
}
public void completeWorkItem(long id, Map<String, Object> results) {
Environment env = this.kruntime.getEnvironment();
// EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
if (workItemInfo != null) {
workItemInfo = context.merge(workItemInfo);
}
}
if (workItemInfo == null) {
workItemInfo = context.findWorkItemInfo( id );
}
// work item may have been aborted
if (workItemInfo != null) {
WorkItem workItem = (WorkItemImpl) workItemInfo.getWorkItem(env);
workItem.setResults(results);
ProcessInstance processInstance = kruntime.getProcessInstance(workItem.getProcessInstanceId());
workItem.setState(WorkItem.COMPLETED);
// process instance may have finished already
if (processInstance != null) {
processInstance.signalEvent("workItemCompleted", workItem);
}
context.remove(workItemInfo);
if (workItems != null) {
this.workItems.remove(workItem.getId());
}
}
}
public void abortWorkItem(long id) {
Environment env = this.kruntime.getEnvironment();
// EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
context.merge(workItemInfo);
}
if (workItemInfo == null) {
workItemInfo = context.findWorkItemInfo( id );
}
// work item may have been aborted
if (workItemInfo != null) {
WorkItem workItem = (WorkItemImpl) workItemInfo.getWorkItem(env);
ProcessInstance processInstance = kruntime.getProcessInstance(workItem.getProcessInstanceId());
workItem.setState(WorkItem.ABORTED);
// process instance may have finished already
if (processInstance != null) {
processInstance.signalEvent("workItemAborted", workItem);
}
context.remove(workItemInfo);
if (workItems != null) {
workItems.remove(workItem.getId());
}
}
}
public WorkItem getWorkItem(long id) {
Environment env = this.kruntime.getEnvironment();
// EntityManager em = (EntityManager) env.get(EnvironmentName.CMD_SCOPED_ENTITY_MANAGER);
PersistenceContext context = ((PersistenceContextManager) env.get( EnvironmentName.PERSISTENCE_CONTEXT_MANAGER )).getCommandScopedPersistenceContext();
WorkItemInfo workItemInfo = null;
if (this.workItems != null) {
workItemInfo = this.workItems.get(id);
}
if (workItemInfo == null && context != null) {
workItemInfo = context.findWorkItemInfo( 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();
}
}
public void clear() {
clearWorkItems();
}
}