Package org.apache.storm.tuple

Interface Tuple

All Superinterfaces:

ITuple

All Known Implementing Classes:

ClojureTuple, TupleImpl

public interface Tuple
extends ITuple

The tuple is the main data structure in Storm. A tuple is a named list of values, where each value can be any type. Tuples are dynamically typed -- the types of the fields do not need to be declared. Tuples have helper methods like getInteger and getString to get field values without having to cast the result.

Storm needs to know how to serialize all the values in a tuple. By default, Storm knows how to serialize the primitive types, strings, and byte arrays. If you want to use another type, you'll need to implement and register a serializer for that type.

See Also:

• Serialization

Method Summary

Modifier and Type	Method	Description
GeneralTopologyContext	getContext()	Gets the topology context associated with the tuple.
MessageId	getMessageId()	Gets the message id that associated with this tuple.
String	getSourceComponent()	Gets the id of the component that created this tuple.
GlobalStreamId	getSourceGlobalStreamId()	Returns the global stream id (component + stream) of this tuple.
String	getSourceStreamId()	Gets the id of the stream that this tuple was emitted to.
int	getSourceTask()	Gets the id of the task that created this tuple.

Methods inherited from interface org.apache.storm.tuple.ITuple

contains, fieldIndex, getBinary, getBinaryByField, getBoolean, getBooleanByField, getByte, getByteByField, getDouble, getDoubleByField, getFields, getFloat, getFloatByField, getInteger, getIntegerByField, getLong, getLongByField, getShort, getShortByField, getString, getStringByField, getValue, getValueByField, getValues, select, size

Method Details

getSourceGlobalStreamId

GlobalStreamId getSourceGlobalStreamId()

Returns the global stream id (component + stream) of this tuple.

getSourceComponent

String getSourceComponent()

Gets the id of the component that created this tuple.

getSourceTask

int getSourceTask()

Gets the id of the task that created this tuple.

getSourceStreamId

String getSourceStreamId()

Gets the id of the stream that this tuple was emitted to.

getMessageId

MessageId getMessageId()

Gets the message id that associated with this tuple.

getContext

GeneralTopologyContext getContext()

Gets the topology context associated with the tuple.