Examples with RetryStrategy org.opencastproject.workflow.api.RetryStrategy used on opensource projects

Example 1 with RetryStrategy

use of org.opencastproject.workflow.api.RetryStrategy in project opencast by opencast.

the class WorkflowServiceImpl method handleOperationResult.

/**
 * Callback for workflow operation handlers that executed and finished without exception. This implementation assumes
 * that the operation worker has already adjusted the current operation's state appropriately.
 *
 * @param workflow
 *          the workflow instance
 * @param result
 *          the workflow operation result
 * @return the workflow instance
 * @throws WorkflowDatabaseException
 *           if updating the workflow fails
 */
protected WorkflowInstance handleOperationResult(WorkflowInstance workflow, WorkflowOperationResult result) throws WorkflowDatabaseException {
    // Get the operation and its handler
    WorkflowOperationInstanceImpl currentOperation = (WorkflowOperationInstanceImpl) workflow.getCurrentOperation();
    WorkflowOperationHandler handler = getWorkflowOperationHandler(currentOperation.getTemplate());
    // Create an operation result for the lazy or else update the workflow's media package
    if (result == null) {
        logger.warn("Handling a null operation result for workflow %s in operation %s", workflow.getId(), currentOperation.getTemplate());
        result = new WorkflowOperationResultImpl(workflow.getMediaPackage(), null, Action.CONTINUE, 0);
    } else {
        MediaPackage mp = result.getMediaPackage();
        if (mp != null) {
            workflow.setMediaPackage(mp);
        }
    }
    // The action to take
    Action action = result.getAction();
    // Update the workflow configuration. Update the reference to the current operation as well, since the workflow has
    // been serialized and deserialized in the meantime.
    int currentOperationPosition = currentOperation.getPosition();
    workflow = updateConfiguration(workflow, result.getProperties());
    currentOperation = (WorkflowOperationInstanceImpl) workflow.getOperations().get(currentOperationPosition);
    // Adjust workflow statistics
    currentOperation.setTimeInQueue(result.getTimeInQueue());
    // Adjust the operation state
    switch(action) {
        case CONTINUE:
            currentOperation.setState(OperationState.SUCCEEDED);
            break;
        case PAUSE:
            if (!(handler instanceof ResumableWorkflowOperationHandler)) {
                throw new IllegalStateException("Operation " + currentOperation.getTemplate() + " is not resumable");
            }
            // Set abortable and continuable to default values
            currentOperation.setContinuable(result.allowsContinue());
            currentOperation.setAbortable(result.allowsAbort());
            ResumableWorkflowOperationHandler resumableHandler = (ResumableWorkflowOperationHandler) handler;
            try {
                String url = resumableHandler.getHoldStateUserInterfaceURL(workflow);
                if (url != null) {
                    String holdActionTitle = resumableHandler.getHoldActionTitle();
                    currentOperation.setHoldActionTitle(holdActionTitle);
                    currentOperation.setHoldStateUserInterfaceUrl(url);
                }
            } catch (WorkflowOperationException e) {
                logger.warn(e, "unable to replace workflow ID in the hold state URL");
            }
            workflow.setState(PAUSED);
            currentOperation.setState(OperationState.PAUSED);
            break;
        case SKIP:
            currentOperation.setState(OperationState.SKIPPED);
            break;
        default:
            throw new IllegalStateException("Unknown action '" + action + "' returned");
    }
    if (ERROR_RESOLUTION_HANDLER_ID.equals(currentOperation.getTemplate()) && result.getAction() == Action.CONTINUE) {
        Map<String, String> resultProperties = result.getProperties();
        if (resultProperties == null || StringUtils.isBlank(resultProperties.get(RETRY_STRATEGY)))
            throw new WorkflowDatabaseException("Retry strategy not present in properties!");
        RetryStrategy retryStrategy = RetryStrategy.valueOf(resultProperties.get(RETRY_STRATEGY));
        switch(retryStrategy) {
            case NONE:
                handleFailedOperation(workflow, workflow.getCurrentOperation());
                break;
            case RETRY:
                currentOperation = (WorkflowOperationInstanceImpl) workflow.getCurrentOperation();
                break;
            default:
                throw new WorkflowDatabaseException("Retry strategy not implemented yet!");
        }
    }
    return workflow;
}