org.apache.flink.streaming.api.operators.source

接口 TimestampsAndWatermarks<T>

类型参数:

T - The type of the emitted records.

所有已知实现类:

NoOpTimestampsAndWatermarks, ProgressiveTimestampsAndWatermarks

@Internal
public interface TimestampsAndWatermarks<T>

Basic interface for the timestamp extraction and watermark generation logic for the SourceReader.

Implementations of this class may or may not actually perform certain tasks, like watermark generation. For example, the batch-oriented implementation typically skips all watermark generation logic.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	TimestampsAndWatermarks.WatermarkUpdateListener Lets the owner/creator of the output know about latest emitted watermark.

方法概要

限定符和类型	方法和说明
org.apache.flink.api.connector.source.ReaderOutput<T>	createMainOutput(PushingAsyncDataInput.DataOutput<T> output, TimestampsAndWatermarks.WatermarkUpdateListener watermarkCallback) Creates the ReaderOutput for the source reader, than internally runs the timestamp extraction and watermark generation.
static <E> TimestampsAndWatermarks<E>	createNoOpEventTimeLogic(org.apache.flink.api.common.eventtime.WatermarkStrategy<E> watermarkStrategy, org.apache.flink.metrics.MetricGroup metrics)
static <E> TimestampsAndWatermarks<E>	createProgressiveEventTimeLogic(org.apache.flink.api.common.eventtime.WatermarkStrategy<E> watermarkStrategy, org.apache.flink.metrics.MetricGroup metrics, ProcessingTimeService timeService, long periodicWatermarkIntervalMillis)
void	startPeriodicWatermarkEmits() Starts emitting periodic watermarks, if this implementation produces watermarks, and if periodic watermarks are configured.
void	stopPeriodicWatermarkEmits() Stops emitting periodic watermarks.

方法详细资料

createMainOutput

org.apache.flink.api.connector.source.ReaderOutput<T> createMainOutput(PushingAsyncDataInput.DataOutput<T> output,
                                                                       TimestampsAndWatermarks.WatermarkUpdateListener watermarkCallback)

Creates the ReaderOutput for the source reader, than internally runs the timestamp extraction and watermark generation.

startPeriodicWatermarkEmits

void startPeriodicWatermarkEmits()

Starts emitting periodic watermarks, if this implementation produces watermarks, and if periodic watermarks are configured.

Periodic watermarks are produced by periodically calling the WatermarkGenerator.onPeriodicEmit(WatermarkOutput) method of the underlying Watermark Generators.

stopPeriodicWatermarkEmits

void stopPeriodicWatermarkEmits()

Stops emitting periodic watermarks.

createProgressiveEventTimeLogic

static <E> TimestampsAndWatermarks<E> createProgressiveEventTimeLogic(org.apache.flink.api.common.eventtime.WatermarkStrategy<E> watermarkStrategy,
                                                                      org.apache.flink.metrics.MetricGroup metrics,
                                                                      ProcessingTimeService timeService,
                                                                      long periodicWatermarkIntervalMillis)

createNoOpEventTimeLogic

static <E> TimestampsAndWatermarks<E> createNoOpEventTimeLogic(org.apache.flink.api.common.eventtime.WatermarkStrategy<E> watermarkStrategy,
                                                               org.apache.flink.metrics.MetricGroup metrics)