org.apache.flink.state.api.functions

类 WindowReaderFunction<IN,OUT,KEY,W extends org.apache.flink.streaming.api.windowing.windows.Window>

java.lang.Object

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

org.apache.flink.state.api.functions.WindowReaderFunction<IN,OUT,KEY,W>

类型参数:

IN - The type of the input value.

OUT - The type of the output value.

KEY - The type of the key.

W - The type of Window that this window function can be applied on.

所有已实现的接口:

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

直接已知子类:

EvictingWindowReaderFunction, PassThroughReader

@PublicEvolving
public abstract class WindowReaderFunction<IN,OUT,KEY,W extends org.apache.flink.streaming.api.windowing.windows.Window>
extends org.apache.flink.api.common.functions.AbstractRichFunction

Base abstract class for functions that are evaluated over keyed (grouped) windows using a context for retrieving extra information.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	WindowReaderFunction.Context<W extends org.apache.flink.streaming.api.windowing.windows.Window> The context holding window metadata.

构造器概要

构造器

构造器和说明
WindowReaderFunction()

方法概要

限定符和类型	方法和说明
abstract void	readWindow(KEY key, WindowReaderFunction.Context<W> context, Iterable<IN> elements, org.apache.flink.util.Collector<OUT> out) Evaluates the window and outputs none or several elements.

从类继承的方法 org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

从类继承的方法 java.lang.Object

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

构造器详细资料

WindowReaderFunction

public WindowReaderFunction()

方法详细资料

readWindow

public abstract void readWindow(KEY key,
                                WindowReaderFunction.Context<W> context,
                                Iterable<IN> elements,
                                org.apache.flink.util.Collector<OUT> out)
                         throws Exception

Evaluates the window and outputs none or several elements.

参数:

key - The key for which this window is evaluated.

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

elements - 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.