Examples with CompensationScopeInstance io.automatiko.engine.workflow.base.instance.context.exception.CompensationScopeInstance used on opensource projects

Example 1 with CompensationScopeInstance

use of io.automatiko.engine.workflow.base.instance.context.exception.CompensationScopeInstance in project automatiko-engine by automatiko-io.

the class CompensationEventListener method signalEvent.

/**
 * When signaling compensation, you can do that in 1 of 2 ways: 1.
 * signalEvent("Compensation", <node-with-compensation-handler-id>) This is
 * specific compensation, that only possibly triggers the compensation handler
 * attached to the node referred to by the <node-with-compensation-handler-id>.
 * 2. signalEvent("Compensation", "implicit:" +
 * <node-container-containing-compensation-scope-id> ) This is implicit or
 * general compensation, in which you trigger all visible compensation handlers
 * (in the proper order, etc.) in the (sub-)process referred to by the
 * <node-container-containing-compensation-scope-id>.
 */
public void signalEvent(String compensationType, Object activityRefStr) {
    if (!(activityRefStr instanceof String)) {
        throw new WorkflowRuntimeException(null, getProcessInstance(), "Compensation can only be triggered with String events, not an event of type " + (activityRefStr == null ? "null" : activityRefStr.getClass().getSimpleName()));
    }
    // 1. parse the activity ref (is it general or specific compensation?)
    String activityRef = (String) activityRefStr;
    String toCompensateNodeId = activityRef;
    boolean generalCompensation = false;
    if (activityRef.startsWith(IMPLICIT_COMPENSATION_PREFIX)) {
        toCompensateNodeId = activityRef.substring(IMPLICIT_COMPENSATION_PREFIX.length());
        generalCompensation = true;
    }
    io.automatiko.engine.workflow.base.core.Process process = (io.automatiko.engine.workflow.base.core.Process) instance.getProcess();
    // 2. for specific compensation: find the node that will be compensated
    // for general compensation: find the compensation scope container that contains
    // all the visible compensation handlers
    Node toCompensateNode = null;
    ContextContainer compensationScopeContainer = null;
    if (generalCompensation) {
        if (toCompensateNodeId.equals(instance.getProcessId())) {
            compensationScopeContainer = process;
        } else {
            compensationScopeContainer = (ContextContainer) findNode(toCompensateNodeId);
        }
    } else {
        toCompensateNode = findNode(toCompensateNodeId);
    }
    // c. handle the exception (which also cleans up the generated node instances)
    if (toCompensateNode != null || compensationScopeContainer != null) {
        CompensationScope compensationScope = null;
        if (compensationScopeContainer != null) {
            compensationScope = (CompensationScope) compensationScopeContainer.getDefaultContext(COMPENSATION_SCOPE);
        } else {
            compensationScope = (CompensationScope) ((NodeImpl) toCompensateNode).resolveContext(COMPENSATION_SCOPE, toCompensateNodeId);
        }
        assert compensationScope != null : "Compensation scope for node [" + toCompensateNodeId + "] could not be found!";
        CompensationScopeInstance scopeInstance;
        if (compensationScope.getContextContainerId().equals(process.getId())) {
            // process level compensation
            scopeInstance = (CompensationScopeInstance) instance.getContextInstance(compensationScope);
        } else {
            // nested compensation
            Stack<NodeInstance> generatedInstances;
            if (toCompensateNode == null) {
                // logic is the same if it's specific or general
                generatedInstances = createNodeInstanceContainers((Node) compensationScopeContainer, true);
            } else {
                generatedInstances = createNodeInstanceContainers(toCompensateNode, false);
            }
            NodeInstance nodeInstanceContainer = generatedInstances.peek();
            scopeInstance = ((CompensationScopeInstance) ((ContextInstanceContainer) nodeInstanceContainer).getContextInstance(compensationScope));
            scopeInstance.addCompensationInstances(generatedInstances);
        }
        scopeInstance.handleException(null, activityRef, null);
    }
}