Interface PendingMessageLimitStrategy

  • All Known Implementing Classes:
    ConstantPendingMessageLimitStrategy, PrefetchRatePendingMessageLimitStrategy

    public interface PendingMessageLimitStrategy
    A pluggable strategy to calculate the maximum number of messages that are allowed to be pending on consumers (in addition to their prefetch sizes). Once the limit is reached, non-durable topics can then start discarding old messages. This allows us to keep dispatching messages to slow consumers while not blocking fast consumers and discarding the messages oldest first.
    • Method Detail

      • getMaximumPendingMessageLimit

        int getMaximumPendingMessageLimit​(TopicSubscription subscription)
        Calculate the maximum number of pending messages (in excess of the prefetch size) for the given subscription
        the maximum or -1 if there is no maximum