StreamTuple class (common API)

uCosminexus Stream Data Platform - Application Framework Application Development Guide

Class hierarchy

 
java.lang.Object
  |-jp.co.Hitachi.soft.sdp.common.data.StreamTuple

Explanation

The StreamTuple class is used to express tuples.

Constructor

The following table shows the StreamTuple class constructor list.

Constructor name	Function
StreamTuple(Object[] dataArray)	Generates a new StreamTuple class instance (StreamTuple type object) in the data object array specified in the parameter.

Method

The following table shows the StreamTuple class method list.

Return value	Method name	Function
boolean	equals(Object obj)	Determines whether the data object array and times of the StreamTuple type object specified in the parameter match those in the data object array of the tuple's StreamTuple type object.
Object[]	getDataArray()	Acquires the data object array of the StreamTuple type object.
StreamTime	getSystemTime()	Acquires the system time.
int	hashCode()	Acquires a hash code.
java.lang.String	toString()	Acquires the tuple information from the StreamTuple type object and returns it as a character string.

Notes

The tuple's time is automatically set to the system time when a tuple arrives at the SDP server (StreamTime type object). If a tuple is generated by a custom adaptor, the initial value of the time object is set to null.

Usage example

In the example shown below, data in a Java data type is used to generate a StreamTuple type object.

In this example, the generated tuples have elements that are Integer type data and String type data.

  Object[] data = new Object[] {
      new Integer (1),
      new String ("AAA")
  };
  tuple = new StreamTuple(data);

Organization of this section: StreamTuple(Object[] dataArray) constructor; equals(Object obj) method; getDataArray() method; getSystemTime() method; hashCode() method; toString() method

7.10 StreamTuple class (common API)