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Subject [GitHub] [pulsar] lovelle commented on a change in pull request #3962: Feature / Interceptor for negative ack redelivery
Date Tue, 02 Apr 2019 17:04:20 GMT
lovelle commented on a change in pull request #3962: Feature / Interceptor for negative ack
URL: https://github.com/apache/pulsar/pull/3962#discussion_r271406140

 File path: pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerInterceptors.java
 @@ -109,9 +110,29 @@ public void onAcknowledge(Consumer<T> consumer, MessageId messageId,
Throwable e
      * @param exception exception returned by broker.
     public void onAcknowledgeCumulative(Consumer<T> consumer, MessageId messageId,
Throwable exception) {
-        for (int i = 0; i < interceptors.size(); i++) {
+        for (ConsumerInterceptor<T> interceptor : interceptors) {
             try {
-                interceptors.get(i).onAcknowledgeCumulative(consumer, messageId, exception);
+                interceptor.onAcknowledgeCumulative(consumer, messageId, exception);
+            } catch (Exception e) {
+                log.warn("Error executing interceptor onAcknowledgeCumulative callback ",
+            }
+        }
+    }
+    /**
+     * This method will be called when a redelivery from a negative acknowledge occurs.
+     * <p>
+     * This method calls {@link ConsumerInterceptor#onNegativeAckRedelivery(Consumer, Set<MessageId>)}
method for each interceptor.
+     * <p>
+     * This method does not throw exceptions. Exceptions thrown by any of interceptors in
the chain are logged, but not propagated.
+     *
+     * @param consumer the consumer which contains the interceptors
+     * @param messageIds set of messages ids being redelivery.
+     */
+    public void onNegativeAckRedelivery(Consumer<T> consumer, Set<MessageId>
messageIds) {
 Review comment:
   Yep, at a first glance I thought exactly that, but later I realise that calling `onNegativeAck()`
when `consumer.negativeAcknowledgement()` will occur almost at that very moment (`consumer.negativeAcknowledgement()`
just adds the msg to `negativeAckTracker`) and the user could solve this by himself, instead,
with adding `onNegativeAckRedelivery()` offers a feature which the user cannot solve right
   The good thing about `onNegativeAck()` is that is consistent with current `onAcknowledge()`
existing method.
   Maybe we want to add both features? and in some future also adding the proper `on*()` method
for `UnackMessageTracker`?

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