[GitHub] [pulsar] codelipenghui commented on a change in pull request #3962: Feature / Interceptor for negative ack redelivery

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

codelipenghui commented on a change in pull request #3962: Feature / Interceptor for negative ack redelivery
URL: https://github.com/apache/pulsar/pull/3962#discussion_r276524062
 
 

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 File path: pulsar-client/src/main/java/org/apache/pulsar/client/impl/ConsumerInterceptors.java
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 @@ -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 ", e);
+            }
+        }
+    }
+
+    /**
+     * 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:
   > 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 now.

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