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
 int getMaximumPendingMessageLimit(TopicSubscription subscription)
          Calculate the maximum number of pending messages (in excess of the prefetch size) for the given subscription
 

Method Detail

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


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