org.apache.flink.table.functions

Class FunctionContext

java.lang.Object

org.apache.flink.table.functions.FunctionContext

@PublicEvolving
public class FunctionContext
extends Object

A FunctionContext allows to obtain global runtime information about the context in which the user-defined function is executed.

The information includes the metric group, distributed cache files, and global job parameters.

Constructor Summary

Constructors

Constructor and Description
FunctionContext(org.apache.flink.api.common.functions.RuntimeContext context) Wraps the underlying RuntimeContext.

Method Summary

Modifier and Type	Method and Description
File	getCachedFile(String name) Gets the local temporary file copy of a distributed cache files.
String	getJobParameter(String key, String defaultValue) Gets the global job parameter value associated with the given key as a string.
org.apache.flink.metrics.MetricGroup	getMetricGroup() Returns the metric group for this parallel subtask.

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionContext

public FunctionContext(org.apache.flink.api.common.functions.RuntimeContext context)

Wraps the underlying RuntimeContext.

Parameters:

context - the runtime context in which Flink's Function is executed.

Method Detail

getMetricGroup

public org.apache.flink.metrics.MetricGroup getMetricGroup()

Returns the metric group for this parallel subtask.

Returns:

metric group for this parallel subtask.

getCachedFile

public File getCachedFile(String name)

Gets the local temporary file copy of a distributed cache files.

Parameters:

name - distributed cache file name

Returns:

local temporary file copy of a distributed cache file.

getJobParameter

public String getJobParameter(String key,
                              String defaultValue)

Gets the global job parameter value associated with the given key as a string.

Parameters:

key - key pointing to the associated value

defaultValue - default value which is returned in case global job parameter is null or there is no value associated with the given key

Returns:

(default) value associated with the given key