leventov commented on a change in pull request #6662: Double-checked locking
bug is fixed.
URL: https://github.com/apache/incubator-druid/pull/6662#discussion_r236308742
##########
File path:
processing/src/main/java/org/apache/druid/query/extraction/JavaScriptExtractionFn.java
##########
@@ -120,18 +120,14 @@ public String apply(@Nullable Object value)
* {@link #apply(Object)} can be called by multiple threads, so this
function should be thread-safe to avoid extra
* script compilation.
*/
- private void checkAndCompileScript()
+ private synchronized void checkAndCompileScript()
{
- if (fn == null) {
- // JavaScript configuration should be checked when it's actually used
because someone might still want Druid
- // nodes to be able to deserialize JavaScript-based objects even though
JavaScript is disabled.
- Preconditions.checkState(config.isEnabled(), "JavaScript is disabled");
+ // JavaScript configuration should be checked when it's actually used
because someone might still want Druid
+ // nodes to be able to deserialize JavaScript-based objects even though
JavaScript is disabled.
+ Preconditions.checkState(config.isEnabled(), "JavaScript is disabled");
- synchronized (config) {
- if (fn == null) {
- fn = compile(function);
- }
- }
+ if (fn == null) {
+ fn = compile(function);
Review comment:
Please add `@Nullable`
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