@Override
public final void registerInputOutput() throws Exception {
LOG.debug("registerInputOutput for {}", getName());
boolean initializationCompleted = false;
try {
AccumulatorRegistry accumulatorRegistry = getEnvironment().getAccumulatorRegistry();
userClassLoader = getUserCodeClassLoader();
configuration = new StreamConfig(getTaskConfiguration());
accumulatorMap = accumulatorRegistry.getUserMap();
stateBackend = createStateBackend();
stateBackend.initializeForJob(getEnvironment().getJobID());
headOperator = configuration.getStreamOperator(userClassLoader);
operatorChain =
new OperatorChain<>(this, headOperator, accumulatorRegistry.getReadWriteReporter());
if (headOperator != null) {
headOperator.setup(this, configuration, operatorChain.getChainEntryPoint());
}
timerService =
Executors.newSingleThreadScheduledExecutor(
new DispatcherThreadFactory(TRIGGER_THREAD_GROUP, "Time Trigger for " + getName()));
// task specific initialization
init();
initializationCompleted = true;
} finally {
if (!initializationCompleted) {
if (timerService != null) {
timerService.shutdownNow();
}
if (operatorChain != null) {
operatorChain.releaseOutputs();
}
}
}
}
