[GitHub] [camel] bedlaj commented on a change in pull request #4359: CAMEL-15626: Use StringBuilder instead of StringBuffer

[GitBox <gi...@apache.org>]

bedlaj commented on a change in pull request #4359:
URL: https://github.com/apache/camel/pull/4359#discussion_r499265850



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File path: core/camel-base/src/main/java/org/apache/camel/processor/aggregate/StringAggregationStrategy.java
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@@ -63,12 +63,12 @@ public StringAggregationStrategy pick(Expression expression) {
      */
     @Override
     public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
-        StringBuffer result; // Aggregate in StringBuffer instead of StringBuilder, to make it thread safe

Review comment:
       StringBuffer is here intentionally because it is mutable and ensures locks. As aggregate method can be called in many threads in parallel, you need to ensure locking in different way (synchronized block, ReentrantLock, ...) before changing this to StringBuilder, otherwise the output will be corrupted.




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