Package org.apache.flink.table.runtime.operators.rank

Class FastTop1Function

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.streaming.api.functions.KeyedProcessFunction<org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData>

org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

org.apache.flink.table.runtime.operators.rank.FastTop1Function

All Implemented Interfaces:

Serializable, org.apache.flink.api.common.functions.Function, org.apache.flink.api.common.functions.RichFunction, org.apache.flink.streaming.api.checkpoint.CheckpointedFunction

public class FastTop1Function
extends AbstractTopNFunction
implements org.apache.flink.streaming.api.checkpoint.CheckpointedFunction

A more concise implementation for AppendOnlyTopNFunction and UpdatableTopNFunction when only Top-1 is desired. This function can handle updating stream because the RankProcessStrategy is inferred as UpdateFastStrategy, i.e., 1) the upsert key of input steam contains partition key; 2) the sort field is updated monotonely under the upsert key.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.functions.KeyedProcessFunction

org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context, org.apache.flink.streaming.api.functions.KeyedProcessFunction.OnTimerContext

Field Summary

Fields inherited from class org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

hitCount, inputRowType, keyContext, outputRankNumber, rankEnd, requestCount, sortKeyComparator, sortKeySelector, ttlConfig

Constructor Summary

Constructors

Constructor	Description
FastTop1Function(org.apache.flink.api.common.state.StateTtlConfig ttlConfig, InternalTypeInfo<org.apache.flink.table.data.RowData> inputRowType, GeneratedRecordComparator generatedSortKeyComparator, RowDataKeySelector sortKeySelector, RankType rankType, RankRange rankRange, boolean generateUpdateBefore, boolean outputRankNumber, long cacheSize)

Method Summary

Modifier and Type	Method	Description
void	initializeState(org.apache.flink.runtime.state.FunctionInitializationContext context)
void	open(org.apache.flink.configuration.Configuration parameters)
void	processElement(org.apache.flink.table.data.RowData input, org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context ctx, org.apache.flink.util.Collector<org.apache.flink.table.data.RowData> out)
void	snapshotState(org.apache.flink.runtime.state.FunctionSnapshotContext context)

Methods inherited from class org.apache.flink.table.runtime.operators.rank.AbstractTopNFunction

checkSortKeyInBufferRange, collectDelete, collectDelete, collectInsert, collectInsert, collectUpdateAfter, collectUpdateAfter, collectUpdateBefore, collectUpdateBefore, getDefaultTopNSize, hasOffset, initRankEnd, isInRankEnd, isInRankRange, registerMetric, setKeyContext

Methods inherited from class org.apache.flink.streaming.api.functions.KeyedProcessFunction

onTimer

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, setRuntimeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FastTop1Function

public FastTop1Function(org.apache.flink.api.common.state.StateTtlConfig ttlConfig,
                        InternalTypeInfo<org.apache.flink.table.data.RowData> inputRowType,
                        GeneratedRecordComparator generatedSortKeyComparator,
                        RowDataKeySelector sortKeySelector,
                        RankType rankType,
                        RankRange rankRange,
                        boolean generateUpdateBefore,
                        boolean outputRankNumber,
                        long cacheSize)

Method Detail

open

public void open(org.apache.flink.configuration.Configuration parameters)
          throws Exception

Specified by:

open in interface org.apache.flink.api.common.functions.RichFunction

Overrides:

open in class AbstractTopNFunction

Throws:

Exception

processElement

public void processElement(org.apache.flink.table.data.RowData input,
                           org.apache.flink.streaming.api.functions.KeyedProcessFunction.Context ctx,
                           org.apache.flink.util.Collector<org.apache.flink.table.data.RowData> out)
                    throws Exception

Specified by:

processElement in class org.apache.flink.streaming.api.functions.KeyedProcessFunction<org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData,org.apache.flink.table.data.RowData>

Throws:

Exception

snapshotState

public void snapshotState(org.apache.flink.runtime.state.FunctionSnapshotContext context)
                   throws Exception

Specified by:

snapshotState in interface org.apache.flink.streaming.api.checkpoint.CheckpointedFunction

Throws:

Exception

initializeState

public void initializeState(org.apache.flink.runtime.state.FunctionInitializationContext context)
                     throws Exception

Specified by:

initializeState in interface org.apache.flink.streaming.api.checkpoint.CheckpointedFunction

Throws:

Exception