io.cdap.directives.aggregates

Class DefaultTransientStore

java.lang.Object

io.cdap.directives.aggregates.DefaultTransientStore

All Implemented Interfaces:

TransientStore, Serializable

public class DefaultTransientStore
extends Object
implements TransientStore

This class implements a transient store interface for storing variables that can be set within a step and are available across all the steps when the record is being processed. The life-time of variables set in this store is within a boundary of record being processed.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DefaultTransientStore()

Method Summary

Modifier and Type	Method and Description
<T> T	get(String name) A value associated with the variable in the transient store.
Set<String>	getVariables() Set of all the variables.
void	increment(TransientVariableScope scope, String name, long value) Increments a value of the variable.
void	reset(TransientVariableScope scope) Resets the state of this store.
void	set(TransientVariableScope scope, String name, Object value) Sets the value of the object for variable named 'name'.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultTransientStore

public DefaultTransientStore()

Method Detail

increment

public void increment(TransientVariableScope scope,
                      String name,
                      long value)

Increments a value of the variable.

Specified by:

increment in interface TransientStore

Parameters:

name - of the variable.

value - associated with the variable.

getVariables

public Set<String> getVariables()

Set of all the variables.

Specified by:

getVariables in interface TransientStore

Returns:

list of all the variables.

reset

public void reset(TransientVariableScope scope)

Resets the state of this store.

Specified by:

reset in interface TransientStore

get

public <T> T get(String name)

A value associated with the variable in the transient store.

Specified by:

get in interface TransientStore

Parameters:

name - of the variable to be retrieved.

Returns:

instance of object of type T.

set

public void set(TransientVariableScope scope,
                String name,
                Object value)

Sets the value of the object for variable named 'name'.

Specified by:

set in interface TransientStore

Parameters:

name - of the variable for which the value needs to be set.

value - of the variable.