@Override
public void prepare(FlowProcess flowProcess, OperationCall<NullContext> operationCall) {
super.prepare(flowProcess, operationCall);
_flowProcess = new LoggingFlowProcess(flowProcess);
_flowProcess.addReporter(new LoggingFlowReporter());
_executor = new ThreadedExecutor(_fetcher.getMaxThreads(), _fetcher.getFetcherPolicy().getRequestTimeout());
_refLock = new Object();
_pendingRefs = new ConcurrentHashMap<String, Long>();