Package org.apache.storm.starter.tools

Class RankableObjectWithFields

java.lang.Object

org.apache.storm.starter.tools.RankableObjectWithFields

All Implemented Interfaces:

Serializable, Comparable<Rankable>, Rankable

public class RankableObjectWithFields
extends Object
implements Rankable, Serializable

This class wraps an objects and its associated count, including any additional data fields.

This class can be used, for instance, to track the number of occurrences of an object in a Storm topology.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
RankableObjectWithFields(Object obj, long count, Object... otherFields)

Method Summary

Modifier and Type	Method	Description
int	compareTo(Rankable other)
Rankable	copy()	Note: We do not defensively copy the wrapped object and any accompanying fields.
boolean	equals(Object o)
static RankableObjectWithFields	from(Tuple tuple)	Construct a new instance based on the provided Tuple.
long	getCount()
List<Object>	getFields()	Get fields.
Object	getObject()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

RankableObjectWithFields

public RankableObjectWithFields(Object obj,
 long count,
 Object... otherFields)

Method Details

from

public static RankableObjectWithFields from(Tuple tuple)

Construct a new instance based on the provided Tuple.

This method expects the object to be ranked in the first field (index 0) of the provided tuple, and the number of occurrences of the object (its count) in the second field (index 1). Any further fields in the tuple will be extracted and tracked, too. These fields can be accessed via getFields().

Parameters:

tuple -

Returns:

new instance based on the provided tuple

getObject

public Object getObject()

Specified by:

getObject in interface Rankable

getCount

public long getCount()

Specified by:

getCount in interface Rankable

getFields

public List<Object> getFields()

Get fields.

Returns:

an immutable list of any additional data fields of the object (may be empty but will never be null)

compareTo

public int compareTo(Rankable other)

Specified by:

compareTo in interface Comparable<Rankable>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

copy

public Rankable copy()

Note: We do not defensively copy the wrapped object and any accompanying fields. We do guarantee, however, do return a defensive (shallow) copy of the List object that is wrapping any accompanying fields.

Specified by:

copy in interface Rankable

Returns:

a defensive copy