org.apache.flink.api.java

类 Utils.CountHelper<T>

java.lang.Object

org.apache.flink.api.common.io.RichOutputFormat<T>

org.apache.flink.api.java.Utils.CountHelper<T>

类型参数:

T - Type of elements to count.

所有已实现的接口:

Serializable, org.apache.flink.api.common.io.OutputFormat<T>

封闭类:

Utils

public static class Utils.CountHelper<T>
extends org.apache.flink.api.common.io.RichOutputFormat<T>

Utility sink function that counts elements and writes the count into an accumulator, from which it can be retrieved by the client. This sink is used by the DataSet.count() function.

另请参阅:

序列化表格

嵌套类概要

从接口继承的嵌套类/接口 org.apache.flink.api.common.io.OutputFormat

org.apache.flink.api.common.io.OutputFormat.InitializationContext

构造器概要

构造器

构造器和说明
CountHelper(String id)

方法概要

限定符和类型	方法和说明
void	close()
void	configure(org.apache.flink.configuration.Configuration parameters)
void	open(int taskNumber, int numTasks)
void	writeRecord(T record)

从类继承的方法 org.apache.flink.api.common.io.RichOutputFormat

getRuntimeContext, setRuntimeContext

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.api.common.io.OutputFormat

open

构造器详细资料

CountHelper

public CountHelper(String id)

方法详细资料

configure

public void configure(org.apache.flink.configuration.Configuration parameters)

open

public void open(int taskNumber,
                 int numTasks)

writeRecord

public void writeRecord(T record)

close

public void close()