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package org.activiti.engine.impl.agenda;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.activiti.bpmn.model.Activity;
import org.activiti.bpmn.model.AdhocSubProcess;
import org.activiti.bpmn.model.BoundaryEvent;
import org.activiti.bpmn.model.CancelEventDefinition;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.Gateway;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.bpmn.model.SubProcess;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.ExecutionListener;
import org.activiti.engine.delegate.Expression;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.Condition;
import org.activiti.engine.impl.bpmn.helper.SkipExpressionUtil;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.el.UelExpressionCondition;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.ExecutionEntityManager;
import org.activiti.engine.impl.util.CollectionUtil;
import org.activiti.engine.impl.util.condition.ConditionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Operation that leaves the {@link FlowElement} where the {@link ExecutionEntity} is currently at
* and leaves it following the sequence flow.
*/
public class TakeOutgoingSequenceFlowsOperation extends AbstractOperation {
private static final Logger logger = LoggerFactory.getLogger(TakeOutgoingSequenceFlowsOperation.class);
protected boolean evaluateConditions;
public TakeOutgoingSequenceFlowsOperation(CommandContext commandContext,
ExecutionEntity executionEntity,
boolean evaluateConditions) {
super(commandContext,
executionEntity);
this.evaluateConditions = evaluateConditions;
}
@Override
public void run() {
FlowElement currentFlowElement = getCurrentFlowElement(execution);
// Compensation check
if ((currentFlowElement instanceof Activity)
&& (((Activity) currentFlowElement)).isForCompensation()) {
/*
* If the current flow element is part of a compensation, we don't always
* want to follow the regular rules of leaving an activity.
* More specifically, if there are no outgoing sequenceflow, we simply must stop
* the execution there and don't go up in the scopes as we usually do
* to find the outgoing sequenceflow
*/
cleanupCompensation();
return;
}
// When leaving the current activity, we need to delete any related execution (eg active boundary events)
cleanupExecutions(currentFlowElement);
if (currentFlowElement instanceof FlowNode) {
handleFlowNode((FlowNode) currentFlowElement);
} else if (currentFlowElement instanceof SequenceFlow) {
handleSequenceFlow();
}
}
protected void handleFlowNode(FlowNode flowNode) {
handleActivityEnd(flowNode);
if (flowNode.getParentContainer() != null
&& flowNode.getParentContainer() instanceof AdhocSubProcess) {
handleAdhocSubProcess(flowNode);
} else {
leaveFlowNode(flowNode);
}
}
protected void handleActivityEnd(FlowNode flowNode) {
// a process instance execution can never leave a flow node, but it can pass here whilst cleaning up
// hence the check for NOT being a process instance
if (!execution.isProcessInstanceType()) {
if (CollectionUtil.isNotEmpty(flowNode.getExecutionListeners())) {
executeExecutionListeners(flowNode,
ExecutionListener.EVENTNAME_END);
}
commandContext.getHistoryManager().recordActivityEnd(execution,
null);
if (!(execution.getCurrentFlowElement() instanceof SubProcess)) {
Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
ActivitiEventBuilder.createActivityEvent(ActivitiEventType.ACTIVITY_COMPLETED,
flowNode.getId(),
flowNode.getName(),
execution.getId(),
execution.getProcessInstanceId(),
execution.getProcessDefinitionId(),
flowNode));
}
}
}
protected void leaveFlowNode(FlowNode flowNode) {
logger.debug("Leaving flow node {} with id '{}' by following it's {} outgoing sequenceflow",
flowNode.getClass(),
flowNode.getId(),
flowNode.getOutgoingFlows().size());
// Get default sequence flow (if set)
String defaultSequenceFlowId = null;
if (flowNode instanceof Activity) {
defaultSequenceFlowId = ((Activity) flowNode).getDefaultFlow();
} else if (flowNode instanceof Gateway) {
defaultSequenceFlowId = ((Gateway) flowNode).getDefaultFlow();
}
// Determine which sequence flows can be used for leaving
List outgoingSequenceFlows = new ArrayList();
for (SequenceFlow sequenceFlow : flowNode.getOutgoingFlows()) {
String skipExpressionString = sequenceFlow.getSkipExpression();
if (!SkipExpressionUtil.isSkipExpressionEnabled(execution,
skipExpressionString)) {
if (!evaluateConditions
|| (evaluateConditions && ConditionUtil.hasTrueCondition(sequenceFlow,
execution) && (defaultSequenceFlowId == null || !defaultSequenceFlowId.equals(sequenceFlow.getId())))) {
outgoingSequenceFlows.add(sequenceFlow);
}
} else if (flowNode.getOutgoingFlows().size() == 1 || SkipExpressionUtil.shouldSkipFlowElement(commandContext,
execution,
skipExpressionString)) {
// The 'skip' for a sequence flow means that we skip the condition, not the sequence flow.
outgoingSequenceFlows.add(sequenceFlow);
}
}
// Check if there is a default sequence flow
if (outgoingSequenceFlows.size() == 0 && evaluateConditions) { // The elements that set this to false also have no support for default sequence flow
if (defaultSequenceFlowId != null) {
for (SequenceFlow sequenceFlow : flowNode.getOutgoingFlows()) {
if (defaultSequenceFlowId.equals(sequenceFlow.getId())) {
outgoingSequenceFlows.add(sequenceFlow);
break;
}
}
}
}
// No outgoing found. Ending the execution
if (outgoingSequenceFlows.size() == 0) {
if (flowNode.getOutgoingFlows() == null || flowNode.getOutgoingFlows().size() == 0) {
logger.debug("No outgoing sequence flow found for flow node '{}'.",
flowNode.getId());
Context.getAgenda().planEndExecutionOperation(execution);
} else {
throw new ActivitiException("No outgoing sequence flow of element '" + flowNode.getId() + "' could be selected for continuing the process");
}
} else {
// Leave, and reuse the incoming sequence flow, make executions for all the others (if applicable)
ExecutionEntityManager executionEntityManager = commandContext.getExecutionEntityManager();
List outgoingExecutions = new ArrayList(flowNode.getOutgoingFlows().size());
SequenceFlow sequenceFlow = outgoingSequenceFlows.get(0);
// Reuse existing one
execution.setCurrentFlowElement(sequenceFlow);
execution.setActive(true);
outgoingExecutions.add((ExecutionEntity) execution);
// Executions for all the other one
if (outgoingSequenceFlows.size() > 1) {
for (int i = 1; i < outgoingSequenceFlows.size(); i++) {
ExecutionEntity parent = execution.getParentId() != null ? execution.getParent() : execution;
ExecutionEntity outgoingExecutionEntity = commandContext.getExecutionEntityManager().createChildExecution(parent);
SequenceFlow outgoingSequenceFlow = outgoingSequenceFlows.get(i);
outgoingExecutionEntity.setCurrentFlowElement(outgoingSequenceFlow);
executionEntityManager.insert(outgoingExecutionEntity);
outgoingExecutions.add(outgoingExecutionEntity);
}
}
// Leave (only done when all executions have been made, since some queries depend on this)
for (ExecutionEntity outgoingExecution : outgoingExecutions) {
Context.getAgenda().planContinueProcessOperation(outgoingExecution);
}
}
}
protected void handleAdhocSubProcess(FlowNode flowNode) {
boolean completeAdhocSubProcess = false;
AdhocSubProcess adhocSubProcess = (AdhocSubProcess) flowNode.getParentContainer();
if (adhocSubProcess.getCompletionCondition() != null) {
Expression expression = Context.getProcessEngineConfiguration().getExpressionManager().createExpression(adhocSubProcess.getCompletionCondition());
Condition condition = new UelExpressionCondition(expression);
if (condition.evaluate(adhocSubProcess.getId(),
execution)) {
completeAdhocSubProcess = true;
}
}
if (flowNode.getOutgoingFlows().size() > 0) {
leaveFlowNode(flowNode);
} else {
commandContext.getExecutionEntityManager().deleteExecutionAndRelatedData(execution,
null,
false);
}
if (completeAdhocSubProcess) {
boolean endAdhocSubProcess = true;
if (!adhocSubProcess.isCancelRemainingInstances()) {
List childExecutions = commandContext.getExecutionEntityManager().findChildExecutionsByParentExecutionId(execution.getParentId());
for (ExecutionEntity executionEntity : childExecutions) {
if (!executionEntity.getId().equals(execution.getId())) {
endAdhocSubProcess = false;
break;
}
}
}
if (endAdhocSubProcess) {
Context.getAgenda().planEndExecutionOperation(execution.getParent());
}
}
}
protected void handleSequenceFlow() {
commandContext.getHistoryManager().recordActivityEnd(execution,
null);
Context.getAgenda().planContinueProcessOperation(execution);
}
protected void cleanupCompensation() {
// The compensation is at the end here. Simply stop the execution.
commandContext.getHistoryManager().recordActivityEnd(execution,
null);
commandContext.getExecutionEntityManager().deleteExecutionAndRelatedData(execution,
null,
false);
ExecutionEntity parentExecutionEntity = execution.getParent();
if (parentExecutionEntity.isScope() && !parentExecutionEntity.isProcessInstanceType()) {
if (allChildExecutionsEnded(parentExecutionEntity,
null)) {
// Go up the hierarchy to check if the next scope is ended too.
// This could happen if only the compensation activity is still active, but the
// main process is already finished.
ExecutionEntity executionEntityToEnd = parentExecutionEntity;
ExecutionEntity scopeExecutionEntity = findNextParentScopeExecutionWithAllEndedChildExecutions(parentExecutionEntity,
parentExecutionEntity);
while (scopeExecutionEntity != null) {
executionEntityToEnd = scopeExecutionEntity;
scopeExecutionEntity = findNextParentScopeExecutionWithAllEndedChildExecutions(scopeExecutionEntity,
parentExecutionEntity);
}
if (executionEntityToEnd.isProcessInstanceType()) {
Context.getAgenda().planEndExecutionOperation(executionEntityToEnd);
} else {
Context.getAgenda().planDestroyScopeOperation(executionEntityToEnd);
}
}
}
}
protected void cleanupExecutions(FlowElement currentFlowElement) {
if (execution.getParentId() != null && execution.isScope()) {
// If the execution is a scope (and not a process instance), the scope must first be
// destroyed before we can continue and follow the sequence flow
Context.getAgenda().planDestroyScopeOperation(execution);
} else if (currentFlowElement instanceof Activity) {
// If the current activity is an activity, we need to remove any currently active boundary events
Activity activity = (Activity) currentFlowElement;
if (CollectionUtil.isNotEmpty(activity.getBoundaryEvents())) {
// Cancel events are not removed
List notToDeleteEvents = new ArrayList();
for (BoundaryEvent event : activity.getBoundaryEvents()) {
if (CollectionUtil.isNotEmpty(event.getEventDefinitions()) &&
event.getEventDefinitions().get(0) instanceof CancelEventDefinition) {
notToDeleteEvents.add(event.getId());
}
}
// Delete all child executions
Collection childExecutions = commandContext.getExecutionEntityManager().findChildExecutionsByParentExecutionId(execution.getId());
for (ExecutionEntity childExecution : childExecutions) {
if (childExecution.getCurrentFlowElement() == null || !notToDeleteEvents.contains(childExecution.getCurrentFlowElement().getId())) {
commandContext.getExecutionEntityManager().deleteExecutionAndRelatedData(childExecution,
null,
false);
}
}
}
}
}
// Compensation helper methods
/**
* @param executionEntityToIgnore The execution entity which we can ignore to be ended,
* as it's the execution currently being handled in this operation.
*/
protected ExecutionEntity findNextParentScopeExecutionWithAllEndedChildExecutions(ExecutionEntity executionEntity,
ExecutionEntity executionEntityToIgnore) {
if (executionEntity.getParentId() != null) {
ExecutionEntity scopeExecutionEntity = executionEntity.getParent();
// Find next scope
while (!scopeExecutionEntity.isScope() || !scopeExecutionEntity.isProcessInstanceType()) {
scopeExecutionEntity = scopeExecutionEntity.getParent();
}
// Return when all child executions for it are ended
if (allChildExecutionsEnded(scopeExecutionEntity,
executionEntityToIgnore)) {
return scopeExecutionEntity;
}
}
return null;
}
protected boolean allChildExecutionsEnded(ExecutionEntity parentExecutionEntity,
ExecutionEntity executionEntityToIgnore) {
for (ExecutionEntity childExecutionEntity : parentExecutionEntity.getExecutions()) {
if (executionEntityToIgnore == null || !executionEntityToIgnore.getId().equals(childExecutionEntity.getId())) {
if (!childExecutionEntity.isEnded()) {
return false;
}
if (childExecutionEntity.getExecutions() != null && childExecutionEntity.getExecutions().size() > 0) {
if (!allChildExecutionsEnded(childExecutionEntity,
executionEntityToIgnore)) {
return false;
}
}
}
}
return true;
}
}
