Yeah, it's already have a enum in BacklogQuota named RetentionPolicy
```java
public static enum RetentionPolicy {
/** Policy which holds producer's send request until the resource
becomes available (or holding times out) */
producer_request_hold,
/** Policy which throws javax.jms.ResourceAllocationException to the
producer */
producer_exception,
/** Policy which evicts the oldest message from the slowest consumer's
backlog */
consumer_backlog_eviction,
}
```
[ Full content available at:
https://github.com/apache/incubator-pulsar/pull/2460 ]
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