public ExecutionStatus execute()

in jbatch/src/main/java/org/apache/batchee/container/impl/controller/BaseStepController.java [129:218]
54 lines of code
10 McCabe index (conditional complexity)

    public ExecutionStatus execute() {
        // Here we're just setting up to decide if we're going to run the step or not (if it's already complete and
        // allow-start-if-complete=false.
        try {
            boolean executeStep = shouldStepBeExecuted();
            if (!executeStep) {
                return new ExecutionStatus(ExtendedBatchStatus.DO_NOT_RUN, stepStatus.getExitStatus());
            }
        } catch (final Throwable t) {
            // Treat an error at this point as unrecoverable, so fail job too.
            markJobAndStepFailed();
            LOGGER.log(Level.SEVERE, t.getMessage(), t);
            rethrowWithMsg("Caught throwable while determining if step should be executed.  Failing job.", t);
        }

        // At this point we have a StepExecution.  Setup so that we're ready to invoke artifacts.
        try {
            startStep();
        } catch (final Throwable t) {
            // Treat an error at this point as unrecoverable, so fail job too.
            markJobAndStepFailed();
            LOGGER.log(Level.SEVERE, t.getMessage(), t);
            rethrowWithMsg("Caught throwable while starting step.  Failing job.", t);
        }

        // At this point artifacts are in the picture so we want to try to invoke afterStep() on a failure.
        try {
            invokePreStepArtifacts();    //Call PartitionReducer and StepListener(s)
            invokeCoreStep();
        } catch (final Exception e) {
            // We're going to continue on so that we can execute the afterStep() and analyzer
            try {
                LOGGER.log(Level.SEVERE, e.getMessage(), e);
                markStepFailed();
            } catch (final Throwable t) {
                // Since the first one is the original first failure, let's rethrow t1 and not the second error,
                // but we'll log a severe error pointing out that the failure didn't get persisted..
                // We won't try to call the afterStep() in this case either.
                rethrowWithMsg("ERROR. PERSISTING BATCH STATUS FAILED.  STEP EXECUTION STATUS TABLES MIGHT HAVE CONSISTENCY ISSUES" +
                    "AND/OR UNEXPECTED ENTRIES.", t);
            }
        } catch (final Throwable t) {
            LOGGER.log(Level.SEVERE, t.getMessage(), t);
            markJobAndStepFailed();
        }

        //
        // At this point we may have already failed the step, but we still try to invoke the end of step artifacts.
        //
        try {
            //Call PartitionAnalyzer, PartitionReducer and StepListener(s)
            invokePostStepArtifacts();
        } catch (final Throwable t) {
            LOGGER.log(Level.SEVERE, t.getMessage(), t);
            markStepFailed();
        }

        //
        // No more application code is on the path from here on out (excluding the call to the PartitionAnalyzer
        // analyzeStatus().  If an exception bubbles up and leaves the statuses inconsistent or incorrect then so be it;
        // maybe there's a runtime bug that will need to be fixed.
        //
        try {
            // Now that all step-level artifacts have had a chance to run,
            // we set the exit status to one of the defaults if it is still unset.

            // This is going to be the very last sequence of calls from the step running on the main thread,
            // since the call back to the partition analyzer only happens on the partition threads.
            // On the partition threads, then, we harden the status at the partition level before we
            // send it back to the main thread.
            persistUserData();
            transitionToFinalBatchStatus();
            defaultExitStatusIfNecessary();
            persistExitStatusAndEndTimestamp();
        } catch (final Throwable t) {
            // Don't let an exception caught here prevent us from persisting the failed batch status.
            markJobAndStepFailed();
            rethrowWithMsg("Failure ending step execution", t);
        }

        //
        // Only happens on main thread.
        //
        sendStatusFromPartitionToAnalyzerIfPresent();

        if (stepStatus.getBatchStatus().equals(BatchStatus.FAILED)) {
            return new ExecutionStatus(ExtendedBatchStatus.EXCEPTION_THROWN, stepStatus.getExitStatus());
        }
        return new ExecutionStatus(ExtendedBatchStatus.NORMAL_COMPLETION, stepStatus.getExitStatus());
    }