Package org.apache.activemq.broker.region.policy

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 Summary

    Modifier and Type
    Method
    Description
    int
    getMaximumPendingMessageLimit(TopicSubscription subscription)
    Calculate the maximum number of pending messages (in excess of the prefetch size) for the given subscription

  • Method Details

    • getMaximumPendingMessageLimit

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