AsyncWatermarkCache (google-cloud-platform 2.68.0 API)

java.lang.Object
- org.apache.beam.sdk.io.gcp.spanner.changestreams.cache.AsyncWatermarkCache

All Implemented Interfaces:

WatermarkCache
```
public class AsyncWatermarkCache
extends java.lang.Object
implements WatermarkCache
```
Asynchronously compute the earliest partition watermark and stores it in memory. The value will be recomputed periodically, as configured by the refresh rate.
On every period, we will call PartitionMetadataDao#getUnfinishedMinWatermark() to refresh the value.

Constructor Summary

Constructors
Constructor Description

AsyncWatermarkCache(PartitionMetadataDao dao, org.joda.time.Duration refreshRate)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`com.google.cloud.Timestamp`	`getUnfinishedMinWatermark()`	Fetches the earliest partition watermark from the partition metadata table that is not in a `PartitionMetadata.State.FINISHED` state.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AsyncWatermarkCache
```
public AsyncWatermarkCache(PartitionMetadataDao dao,
                           org.joda.time.Duration refreshRate)
```
- Method Detail
  - getUnfinishedMinWatermark
```
@Nullable
public com.google.cloud.Timestamp getUnfinishedMinWatermark()
```
    Description copied from interface: WatermarkCache
    
    Fetches the earliest partition watermark from the partition metadata table that is not in a PartitionMetadata.State.FINISHED state.
    
    Specified by:
    
    getUnfinishedMinWatermark in interface WatermarkCache
    
    Returns:
    
    the earliest partition watermark which is not in a PartitionMetadata.State.FINISHED state.