Datasource (Javadocs [I2P+ 2.13.0+]

java.lang.Object
- org.rrd4j.core.Datasource

All Implemented Interfaces:
RrdUpdater<Datasource>
```
public class Datasource
extends Object
implements RrdUpdater<Datasource>
```
Class to represent single datasource within RRD. Each datasource object holds the following information: datasource definition (once set, never changed) and datasource state variables (changed whenever RRD gets updated).
Normally, you don't need to manipulate Datasource objects directly, it's up to Rrd4j framework to do it for you.

Constructor Summary
Constructors
Constructor and Description
Datasource(RrdDb parentDb, DataImporter reader, int dsIndex)
Datasource(RrdDb parentDb, DsDef dsDef)

Constructors
Constructor and Description
`Datasource(RrdDb parentDb, DataImporter reader, int dsIndex)`
`Datasource(RrdDb parentDb, DsDef dsDef)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`(package private) void`	`appendXml(XmlWriter writer)`
`void`	`copyStateTo(Datasource datasource)` copyStateTo.
`(package private) String`	`dump()` Returns a string representation of datasource information.
`double`	`getAccumValue()` Returns value this datasource accumulated so far.
`int`	`getDsIndex()` Returns index of this Datasource object in the RRD.
`long`	`getHeartbeat()` Returns datasource heartbeat
`double`	`getLastValue()` Returns last known value of the datasource.
`double`	`getMaxValue()` Returns maximal allowed value for this datasource.
`double`	`getMinValue()` Returns minimal allowed value for this datasource.
`String`	`getName()` Returns datasource name.
`long`	`getNanSeconds()` Returns the number of accumulated NaN seconds.
`RrdAllocator`	`getRrdAllocator()` Required to implement RrdUpdater interface.
`RrdBackend`	`getRrdBackend()` Returns the underlying storage (backend) object which actually performs all I/O operations.
`DsType`	`getType()` Returns datasource type (GAUGE, COUNTER, DERIVE, ABSOLUTE).
`(package private) void`	`process(long newTime, double newValue)`
`void`	`setDsName(String newDsName)` Sets datasource name to a new value
`void`	`setDsType(DsType newDsType)` Setter for the field `dsType`.
`void`	`setHeartbeat(long heartbeat)` Sets datasource heartbeat to a new value.
`void`	`setMaxValue(double maxValue, boolean filterArchivedValues)` Sets maximum allowed value for this datasource.
`void`	`setMinMaxValue(double minValue, double maxValue, boolean filterArchivedValues)` Sets min/max values allowed for this datasource.
`void`	`setMinValue(double minValue, boolean filterArchivedValues)` Sets minimum allowed value for this datasource.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Datasource
```
Datasource(RrdDb parentDb,
           DataImporter reader,
           int dsIndex)
    throws IOException
```
    Throws:
    IOException
  - Datasource
```
Datasource(RrdDb parentDb,
           DsDef dsDef)
    throws IOException
```
    Throws:
    IOException
- Method Detail
  - appendXml
```
void appendXml(XmlWriter writer)
        throws IOException
```
    Throws:
    IOException
  - copyStateTo
```
public void copyStateTo(Datasource datasource)
                 throws IOException
```
    copyStateTo.
    Copies object's internal state to another Datasource object.
    Specified by:
    copyStateTo in interface RrdUpdater<Datasource>
    Parameters:
    datasource - a RrdUpdater object.
    Throws:
    IOException - if any.
  - dump
```
String dump()
     throws IOException
```
    Returns a string representation of datasource information.
    Returns:
    a string containing datasource information
    Throws:
    IOException - if an I/O error occurs
  - getAccumValue
```
public double getAccumValue()
                     throws IOException
```
    Returns value this datasource accumulated so far.
    Returns:
    Accumulated datasource value.
    Throws:
    IOException - Thrown in case of I/O error
  - getDsIndex
```
public int getDsIndex()
               throws IOException
```
    Returns index of this Datasource object in the RRD.
    Returns:
    Datasource index in the RRD.
    Throws:
    IOException - Thrown in case of I/O error
  - getHeartbeat
```
public long getHeartbeat()
                  throws IOException
```
    Returns datasource heartbeat
    Returns:
    Datasource heartbeat
    Throws:
    IOException - Thrown in case of I/O error
  - getLastValue
```
public double getLastValue()
                    throws IOException
```
    Returns last known value of the datasource.
    Returns:
    Last datasource value.
    Throws:
    IOException - Thrown in case of I/O error
  - getMaxValue
```
public double getMaxValue()
                   throws IOException
```
    Returns maximal allowed value for this datasource.
    Returns:
    Maximal value allowed.
    Throws:
    IOException - Thrown in case of I/O error
  - getMinValue
```
public double getMinValue()
                   throws IOException
```
    Returns minimal allowed value for this datasource.
    Returns:
    Minimal value allowed.
    Throws:
    IOException - Thrown in case of I/O error
  - getName
```
public String getName()
               throws IOException
```
    Returns datasource name.
    Returns:
    Datasource name
    Throws:
    IOException - Thrown in case of I/O error
  - getNanSeconds
```
public long getNanSeconds()
                   throws IOException
```
    Returns the number of accumulated NaN seconds.
    Returns:
    Accumulated NaN seconds.
    Throws:
    IOException - Thrown in case of I/O error
  - getRrdAllocator
```
public RrdAllocator getRrdAllocator()
```
    Required to implement RrdUpdater interface. You should never call this method directly.
    Specified by:
    getRrdAllocator in interface RrdUpdater<Datasource>
    Returns:
    Allocator object
  - getRrdBackend
```
public RrdBackend getRrdBackend()
```
    Returns the underlying storage (backend) object which actually performs all I/O operations.
    Specified by:
    getRrdBackend in interface RrdUpdater<Datasource>
    Returns:
    I/O backend object
  - getType
```
public DsType getType()
               throws IOException
```
    Returns datasource type (GAUGE, COUNTER, DERIVE, ABSOLUTE).
    Returns:
    Datasource type.
    Throws:
    IOException - Thrown in case of I/O error
  - process
```
final void process(long newTime,
                   double newValue)
            throws IOException
```
    Throws:
    IOException
  - setDsName
```
public void setDsName(String newDsName)
               throws IOException
```
    Sets datasource name to a new value
    Parameters:
    newDsName - New datasource name
    Throws:
    IOException - Thrown in case of I/O error
  - setDsType
```
public void setDsType(DsType newDsType)
               throws IOException
```
    Setter for the field dsType.
    Parameters:
    newDsType - a DsType object.
    Throws:
    IOException - if any.
  - setHeartbeat
```
public void setHeartbeat(long heartbeat)
                  throws IOException
```
    Sets datasource heartbeat to a new value.
    Parameters:
    heartbeat - New heartbeat value
    Throws:
    IOException - Thrown in case of I/O error
    IllegalArgumentException - Thrown if invalid (non-positive) heartbeat value is specified.
  - setMaxValue
```
public void setMaxValue(double maxValue,
                        boolean filterArchivedValues)
                 throws IOException
```
    Sets maximum allowed value for this datasource. If filterArchivedValues argument is set to true, all archived values greater then maxValue will be fixed to NaN.
    Parameters:
    maxValue - New maximal value. Specify Double.NaN if no max value should be set.
    filterArchivedValues - true, if archived datasource values should be fixed; false, otherwise.
    Throws:
    IOException - Thrown in case of I/O error
    IllegalArgumentException - Thrown if invalid maxValue was supplied (not greater then minValue)
  - setMinMaxValue
```
public void setMinMaxValue(double minValue,
                           double maxValue,
                           boolean filterArchivedValues)
                    throws IOException
```
    Sets min/max values allowed for this datasource. If filterArchivedValues argument is set to true, all archived values less then minValue or greater then maxValue will be fixed to NaN.
    Parameters:
    minValue - New minimal value. Specify Double.NaN if no min value should be set.
    maxValue - New maximal value. Specify Double.NaN if no max value should be set.
    filterArchivedValues - true, if archived datasource values should be fixed; false, otherwise.
    Throws:
    IOException - Thrown in case of I/O error
    IllegalArgumentException - Thrown if invalid min/max values were supplied
  - setMinValue
```
public void setMinValue(double minValue,
                        boolean filterArchivedValues)
                 throws IOException
```
    Sets minimum allowed value for this datasource. If filterArchivedValues argument is set to true, all archived values less then minValue will be fixed to NaN.
    Parameters:
    minValue - New minimal value. Specify Double.NaN if no minimal value should be set
    filterArchivedValues - true, if archived datasource values should be fixed; false, otherwise.
    Throws:
    IOException - Thrown in case of I/O error
    IllegalArgumentException - Thrown if invalid minValue was supplied (not less then maxValue)

Class Datasource

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Datasource

Datasource

Method Detail

appendXml

copyStateTo

dump

getAccumValue

getDsIndex

getHeartbeat

getLastValue

getMaxValue

getMinValue

getName

getNanSeconds

getRrdAllocator

getRrdBackend

getType

process

setDsName

setDsType

setHeartbeat

setMaxValue

setMinMaxValue

setMinValue