@VisibleForTesting
    ExecutionState getState() {
        return state;
    }

    String healthDiagnostics() {
        if (isComplete()) {
            return this + " (state=" + state + ")";
        } else {
            StringBuilder specificState = new StringBuilder();
            dependencyNodes.healthDiagnostics(specificState);
            nodeSpecificHealthDiagnostics(specificState);

            List<WorkSource.Diagnostics> allDiagnostics = new ArrayList<>(queues.size());
            for (PlanDetails details : queues) {
                allDiagnostics.add(details.source.healthDiagnostics());
            }
            for (WorkSource.Diagnostics diagnostics : allDiagnostics) {
                diagnostics.describeTo(formatter);
            }
        }
    }