[In A Word]In A Word章11 Flink 的StateTtlConfig

StateTtlConfig用于设置state的TTL属性，这里主要设置UpdateType、StateVisibility、TimeCharacteristic、Time、CleanupStrategies这几个属性

 

public enum UpdateType {
        /** TTL is disabled. State does not expire. */
        Disabled,
        /** Last access timestamp is initialised when state is created and updated on every write operation. */
        OnCreateAndWrite,
        /** The same as <code>OnCreateAndWrite</code> but also updated on read. */
        OnReadAndWrite
    }

public enum StateVisibility {
        /** Return expired user value if it is not cleaned up yet. */
        ReturnExpiredIfNotCleanedUp,
        /** Never return expired user value. */
        NeverReturnExpired
    }

public enum TimeCharacteristic {
        /** Processing time, see also <code>TimeCharacteristic.ProcessingTime</code>. */
        ProcessingTime
    }