ctubbsii commented on code in PR #113:
URL: https://github.com/apache/accumulo-access/pull/113#discussion_r2933431902
##########
modules/core/src/main/java/org/apache/accumulo/access/impl/AccessEvaluatorImpl.java:
##########
@@ -43,7 +45,27 @@ public final class AccessEvaluatorImpl implements
AccessEvaluator {
*/
AccessEvaluatorImpl(Predicate<String> authorizationChecker,
AuthorizationValidator authorizationValidator) {
- this.authorizedPredicate = auth ->
authorizationChecker.test(auth.toString());
+
+ // This map helps avoid allocating string objects on each call to this
predicate
+ Map<CharsWrapper,Boolean> checkCache = new ConcurrentHashMap<>();
+ this.authorizedPredicate = auth -> {
+ if (auth instanceof CharsWrapper wrapped) {
+ // Try to avoid allocating a string object and copying the char array.
+ Boolean cachedResult = checkCache.get(wrapped);
+ if (cachedResult == null) {
+ // Not in cache, so have to allocate and copy
+ String authStr = wrapped.toString();
+ cachedResult = authorizationChecker.test(authStr);
+ // Lets put it in the cache for the next time. Must allocate a new
CharsWrapper as these
+ // are mutable, so can not put the one passed to this lambda in the
map.
+ checkCache.put(new CharsWrapper(authStr.toCharArray()),
cachedResult);
+ }
+ return cachedResult;
+ } else {
+ return authorizationChecker.test(auth.toString());
Review Comment:
Why do we only cache the results for CharsWrapper instances? Wouldn't we
want to cache for all auths? (all instanceof CharSequence)
##########
modules/core/src/main/java/org/apache/accumulo/access/impl/AccessEvaluatorImpl.java:
##########
@@ -43,7 +45,27 @@ public final class AccessEvaluatorImpl implements
AccessEvaluator {
*/
AccessEvaluatorImpl(Predicate<String> authorizationChecker,
AuthorizationValidator authorizationValidator) {
- this.authorizedPredicate = auth ->
authorizationChecker.test(auth.toString());
+
+ // This map helps avoid allocating string objects on each call to this
predicate
+ Map<CharsWrapper,Boolean> checkCache = new ConcurrentHashMap<>();
+ this.authorizedPredicate = auth -> {
+ if (auth instanceof CharsWrapper wrapped) {
+ // Try to avoid allocating a string object and copying the char array.
+ Boolean cachedResult = checkCache.get(wrapped);
Review Comment:
Could this be replaced with `checkCache.computeIfAbsent`?
##########
modules/core/src/main/java/org/apache/accumulo/access/impl/AccessEvaluatorImpl.java:
##########
@@ -43,7 +45,27 @@ public final class AccessEvaluatorImpl implements
AccessEvaluator {
*/
AccessEvaluatorImpl(Predicate<String> authorizationChecker,
AuthorizationValidator authorizationValidator) {
- this.authorizedPredicate = auth ->
authorizationChecker.test(auth.toString());
+
+ // This map helps avoid allocating string objects on each call to this
predicate
+ Map<CharsWrapper,Boolean> checkCache = new ConcurrentHashMap<>();
+ this.authorizedPredicate = auth -> {
+ if (auth instanceof CharsWrapper wrapped) {
+ // Try to avoid allocating a string object and copying the char array.
+ Boolean cachedResult = checkCache.get(wrapped);
+ if (cachedResult == null) {
+ // Not in cache, so have to allocate and copy
+ String authStr = wrapped.toString();
+ cachedResult = authorizationChecker.test(authStr);
Review Comment:
Could we avoid this toString here and below by just making the predicate one
of CharSequence instead of String? Or would that be a problem because mutable
CharSequences could be modified as a side-effect of the predicate?
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