org.apache.flink.streaming.runtime.operators.windowing.functions

接口 InternalWindowFunction<IN,OUT,KEY,W extends Window>

类型参数:

IN - The type of the input value.

OUT - The type of the output value.

KEY - The type of the key.

所有超级接口:

org.apache.flink.api.common.functions.Function, Serializable

所有已知实现类:

InternalAggregateProcessAllWindowFunction, InternalAggregateProcessWindowFunction, InternalIterableAllWindowFunction, InternalIterableProcessAllWindowFunction, InternalIterableProcessWindowFunction, InternalIterableWindowFunction, InternalSingleValueAllWindowFunction, InternalSingleValueProcessAllWindowFunction, InternalSingleValueProcessWindowFunction, InternalSingleValueWindowFunction

public interface InternalWindowFunction<IN,OUT,KEY,W extends Window>
extends org.apache.flink.api.common.functions.Function

Internal interface for functions that are evaluated over keyed (grouped) windows.

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	InternalWindowFunction.InternalWindowContext A context for InternalWindowFunction, similar to ProcessWindowFunction.Context but for internal use.

方法概要

限定符和类型	方法和说明
void	clear(W window, InternalWindowFunction.InternalWindowContext context) Deletes any state in the Context when the Window expires (the watermark passes its maxTimestamp + allowedLateness).
void	process(KEY key, W window, InternalWindowFunction.InternalWindowContext context, IN input, org.apache.flink.util.Collector<OUT> out) Evaluates the window and outputs none or several elements.

方法详细资料

process

void process(KEY key,
             W window,
             InternalWindowFunction.InternalWindowContext context,
             IN input,
             org.apache.flink.util.Collector<OUT> out)
      throws Exception

Evaluates the window and outputs none or several elements.

参数:

context - The context in which the window is being evaluated.

input - The elements in the window being evaluated.

out - A collector for emitting elements.

抛出:

Exception - The function may throw exceptions to fail the program and trigger recovery.

clear

void clear(W window,
           InternalWindowFunction.InternalWindowContext context)
    throws Exception

Deletes any state in the Context when the Window expires (the watermark passes its maxTimestamp + allowedLateness).

参数:

context - The context to which the window is being evaluated

抛出:

Exception - The function may throw exceptions to fail the program and trigger recovery.