// close and read are synchronized because can not call close on the data source while it is in
// use
// this could lead to the case where file iterators that are in use by a thread are returned
// to the pool... this would be bad
public boolean close() {
options.getInterruptFlag().set(true);
boolean obtainedLock = false;
try {
obtainedLock = scannerSemaphore.tryAcquire(10, TimeUnit.MILLISECONDS);
if (!obtainedLock) return false;
scanClosed = true;
if (isolatedDataSource != null) isolatedDataSource.close(false);
} catch (InterruptedException e) {
return false;
} finally {
if (obtainedLock) scannerSemaphore.release();
}
return true;
}
