/**
* Start the ingest procedure.
*
* @param iterator the iterator to iterate on
* @return the pid of the root object, or null of something odd failed
*/
@Override
public String ingest(TreeIterator iterator) {
this.iterator = iterator;
ForkJoinPool forkJoinPool = new ForkJoinPool(concurrency);
ForkJoinTask<String> result;
result = forkJoinPool.submit(this);
forkJoinPool.shutdown();
try {
return result.get();
} catch (CancellationException | ExecutionException | InterruptedException e) {
log.warn("Shutting down pool {}", forkJoinPool);
result.cancel(true);
forkJoinPool.shutdownNow();
boolean shutdown;
try {
shutdown = forkJoinPool.awaitTermination(3, TimeUnit.MINUTES);
} catch (InterruptedException e1) {
shutdown = false;
}
if (!shutdown) {
log.error("Failed to shut down forkjoinpool {}", forkJoinPool);
System.exit(1);
}
log.debug("Pool shot down {}", forkJoinPool);
throw new IngesterShutdownException(e);
}
}
protected void cancelTasks(ForkJoinTask<?>... tasks) {
for (ForkJoinTask<?> task : tasks) {
if (task != null) {
task.cancel(true);
// task.completeExceptionally(null);
}
}
}