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/* 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.activiti.engine.impl.bpmn.deployer;
import org.activiti.bpmn.model.Process;
import org.activiti.bpmn.model.*;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.event.MessageEventHandler;
import org.activiti.engine.impl.event.SignalEventHandler;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.*;
import org.activiti.engine.impl.util.CollectionUtil;
import java.util.List;
/**
* Manages event subscriptions for newly-deployed process definitions and their previous versions.
*/
public class EventSubscriptionManager {
protected void removeObsoleteEventSubscriptionsImpl(ProcessDefinitionEntity processDefinition,
String eventHandlerType) {
// remove all subscriptions for the previous version
EventSubscriptionEntityManager eventSubscriptionEntityManager = Context.getCommandContext().getEventSubscriptionEntityManager();
List subscriptionsToDelete =
eventSubscriptionEntityManager.findEventSubscriptionsByTypeAndProcessDefinitionId(eventHandlerType,
processDefinition.getId(),
processDefinition.getTenantId());
for (EventSubscriptionEntity eventSubscriptionEntity : subscriptionsToDelete) {
eventSubscriptionEntityManager.delete(eventSubscriptionEntity);
}
}
protected void removeObsoleteMessageEventSubscriptions(ProcessDefinitionEntity previousProcessDefinition) {
// remove all subscriptions for the previous version
if (previousProcessDefinition != null) {
removeObsoleteEventSubscriptionsImpl(previousProcessDefinition,
MessageEventHandler.EVENT_HANDLER_TYPE);
}
}
protected void removeObsoleteSignalEventSubScription(ProcessDefinitionEntity previousProcessDefinition) {
// remove all subscriptions for the previous version
if (previousProcessDefinition != null) {
removeObsoleteEventSubscriptionsImpl(previousProcessDefinition,
SignalEventHandler.EVENT_HANDLER_TYPE);
}
}
protected void addMessageEventSubscriptions(ProcessDefinitionEntity processDefinition,
Process process,
BpmnModel bpmnModel) {
if (CollectionUtil.isNotEmpty(process.getFlowElements())) {
for (FlowElement element : process.getFlowElements()) {
if (element instanceof StartEvent) {
StartEvent startEvent = (StartEvent) element;
if (CollectionUtil.isNotEmpty(startEvent.getEventDefinitions())) {
EventDefinition eventDefinition = startEvent.getEventDefinitions().get(0);
if (eventDefinition instanceof MessageEventDefinition) {
MessageEventDefinition messageEventDefinition = (MessageEventDefinition) eventDefinition;
insertMessageEvent(messageEventDefinition,
startEvent,
processDefinition,
bpmnModel);
}
}
}
}
}
}
protected void insertMessageEvent(MessageEventDefinition messageEventDefinition,
StartEvent startEvent,
ProcessDefinitionEntity processDefinition,
BpmnModel bpmnModel) {
CommandContext commandContext = Context.getCommandContext();
if (bpmnModel.containsMessageId(messageEventDefinition.getMessageRef())) {
Message message = bpmnModel.getMessage(messageEventDefinition.getMessageRef());
messageEventDefinition.setMessageRef(message.getName());
}
// look for subscriptions for the same name in db:
List subscriptionsForSameMessageName = commandContext.getEventSubscriptionEntityManager()
.findEventSubscriptionsByName(MessageEventHandler.EVENT_HANDLER_TYPE,
messageEventDefinition.getMessageRef(),
processDefinition.getTenantId());
for (EventSubscriptionEntity eventSubscriptionEntity : subscriptionsForSameMessageName) {
// throw exception only if there's already a subscription as start event
if (eventSubscriptionEntity.getProcessInstanceId() == null || eventSubscriptionEntity.getProcessInstanceId().isEmpty()) { // processInstanceId != null or not empty -> it's a message related to an execution
// the event subscription has no instance-id, so it's a message start event
throw new ActivitiException("Cannot deploy process definition '" + processDefinition.getResourceName()
+ "': there already is a message event subscription for the message with name '" + messageEventDefinition.getMessageRef() + "'.");
}
}
MessageEventSubscriptionEntity newSubscription = commandContext.getEventSubscriptionEntityManager().createMessageEventSubscription();
newSubscription.setEventName(messageEventDefinition.getMessageRef());
newSubscription.setActivityId(startEvent.getId());
newSubscription.setConfiguration(processDefinition.getId());
newSubscription.setProcessDefinitionId(processDefinition.getId());
if (processDefinition.getTenantId() != null) {
newSubscription.setTenantId(processDefinition.getTenantId());
}
commandContext.getEventSubscriptionEntityManager().insert(newSubscription);
}
protected void addSignalEventSubscriptions(CommandContext commandContext,
ProcessDefinitionEntity processDefinition,
Process process,
BpmnModel bpmnModel) {
if (CollectionUtil.isNotEmpty(process.getFlowElements())) {
for (FlowElement element : process.getFlowElements()) {
if (element instanceof StartEvent) {
StartEvent startEvent = (StartEvent) element;
if (CollectionUtil.isNotEmpty(startEvent.getEventDefinitions())) {
EventDefinition eventDefinition = startEvent.getEventDefinitions().get(0);
if (eventDefinition instanceof SignalEventDefinition) {
SignalEventDefinition signalEventDefinition = (SignalEventDefinition) eventDefinition;
SignalEventSubscriptionEntity subscriptionEntity = commandContext.getEventSubscriptionEntityManager().createSignalEventSubscription();
Signal signal = bpmnModel.getSignal(signalEventDefinition.getSignalRef());
if (signal != null) {
subscriptionEntity.setEventName(signal.getName());
} else {
subscriptionEntity.setEventName(signalEventDefinition.getSignalRef());
}
subscriptionEntity.setActivityId(startEvent.getId());
subscriptionEntity.setProcessDefinitionId(processDefinition.getId());
if (processDefinition.getTenantId() != null) {
subscriptionEntity.setTenantId(processDefinition.getTenantId());
}
Context.getCommandContext().getEventSubscriptionEntityManager().insert(subscriptionEntity);
}
}
}
}
}
}
}