mosermw commented on code in PR #7664:
URL: https://github.com/apache/nifi/pull/7664#discussion_r1317258043
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nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/file/monitor/SynchronousFileWatcher.java:
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@@ -77,21 +77,16 @@ public boolean checkAndReset() throws IOException {
private boolean checkForUpdate() throws IOException {
if (resourceLock.tryLock()) {
try {
- final StateWrapper wrapper = lastState.get();
+ final Object oldState = lastState.get().getState();
final Object newState = monitor.getCurrentState(path);
- if (newState == null && wrapper.getState() == null) {
+ if (newState == null && oldState == null) {
return false;
}
- if (newState == null || wrapper.getState() == null) {
- lastState.set(new StateWrapper(newState));
+ lastState.set(new StateWrapper(newState));
Review Comment:
We don't know what UpdateMonitor implementation is currently in use, and
that interface doesn't guarantee that `monitor.getCurrentState(path)` returns
NotNull. So we have to check for nulls before using `newState.equals()` on
line 89.
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