org.opennms.netmgt.rrd
Class JRobinRrdStrategy

java.lang.Object
  org.opennms.netmgt.rrd.JRobinRrdStrategy

All Implemented Interfaces:

RrdStrategy

public class JRobinRrdStrategy

extends java.lang.Object

implements RrdStrategy

Provides a JRobin based implementation of RrdStrategy. It uses JRobin 1.4 in FILE mode (NIO is too memory consuming for the large number of files that we open)

Field Summary

private boolean

m_initialized

Constructor Summary

JRobinRrdStrategy()

Method Summary

void	closeFile(java.lang.Object rrdFile) Closes the JRobin RrdDb.
java.lang.Object	createDefinition(java.lang.String creator, java.lang.String directory, java.lang.String dsName, int step, java.lang.String dsType, int dsHeartbeat, java.lang.String dsMin, java.lang.String dsMax, java.util.List rraList) Creates and returns a RrdDef represented by the parameters.
void	createFile(java.lang.Object rrdDef) Creates the JRobin RrdDb from the def by opening the file and then closing.
java.io.InputStream	createGraph(java.lang.String command, java.io.File workDir) This constructs a graphDef by parsing the rrdtool style command and using the values to create the JRobin graphDef.
java.lang.Double	fetchLastValue(java.lang.String fileName, int interval) Fetch the last value from the JRobin RrdDb file.
private java.awt.Color	getColor(java.lang.String colorValue)
java.lang.String	getStats() This implementation does not track and stats.
void	graphicsInitialize() This Initializes the graphics subsystem only.
void	initialize() Initialized the RrdDb to use the FILE factory because the NIO factory uses too much memory for our implementation.
java.lang.Object	openFile(java.lang.String fileName) Opens the JRobin RrdDb by name and returns it.
private java.lang.String[]	tokenize(java.lang.String line, java.lang.String delims, boolean processQuoted)
void	updateFile(java.lang.Object rrdFile, java.lang.String data) Creates a sample from the JRobin RrdDb and passes in the data provided.

Methods inherited from class java.lang.Object

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

Field Detail

m_initialized

private boolean m_initialized

Constructor Detail

JRobinRrdStrategy

public JRobinRrdStrategy()

Method Detail

closeFile

public void closeFile(java.lang.Object rrdFile)
               throws java.lang.Exception

Closes the JRobin RrdDb.

Specified by:

closeFile in interface RrdStrategy

Parameters:

rrdFile - an rrd object created using openFile

Throws:

java.lang.Exception - if an error occurs closing the file

createDefinition

public java.lang.Object createDefinition(java.lang.String creator,
                                         java.lang.String directory,
                                         java.lang.String dsName,
                                         int step,
                                         java.lang.String dsType,
                                         int dsHeartbeat,
                                         java.lang.String dsMin,
                                         java.lang.String dsMax,
                                         java.util.List rraList)
                                  throws java.lang.Exception

Creates and returns a RrdDef represented by the parameters.

Specified by:

createDefinition in interface RrdStrategy

Parameters:

creator - - A string representing who is creating this file for use in log msgs

directory - - The directory to create the file in

dsName - - The datasource name for use in the round robin database

step - - the step for the database

dsType - - the type for the datasource

dsHeartbeat - - the heartbeat for the datasouce

dsMin - - the minimum allowable value for the datasource

dsMax - - the maximum allowable value for the datasouce

rraList - - a List of the round robin archives to create in the database

Returns:

an object representing the definition of an round robin database

Throws:

java.lang.Exception - If an error occurs while creating the definition

createFile

public void createFile(java.lang.Object rrdDef)
                throws java.lang.Exception

Creates the JRobin RrdDb from the def by opening the file and then closing. TODO: Change the interface here to create the file and return it opened.

Specified by:

createFile in interface RrdStrategy

Parameters:

rrdDef - an round robin database definition created using the createDefinition call.

Throws:

java.lang.Exception - if an error occurs create the file

openFile

public java.lang.Object openFile(java.lang.String fileName)
                          throws java.lang.Exception

Opens the JRobin RrdDb by name and returns it.

Specified by:

openFile in interface RrdStrategy

Parameters:

fileName - the name of the associated rrd file

Returns:

an open rrd reference that can by used in calls to updateFile and closeFile

Throws:

java.lang.Exception - if an error occurs opening the file

updateFile

public void updateFile(java.lang.Object rrdFile,
                       java.lang.String data)
                throws java.lang.Exception

Creates a sample from the JRobin RrdDb and passes in the data provided.

Specified by:

updateFile in interface RrdStrategy

Parameters:

rrdFile - an rrd object created using openFile

data - a string of the form :

Throws:

java.lang.Exception - if an error occurs updating the file

initialize

public void initialize()
                throws java.lang.Exception

Initialized the RrdDb to use the FILE factory because the NIO factory uses too much memory for our implementation.

Specified by:

initialize in interface RrdStrategy

Throws:

java.lang.Exception - if an Error occurs

graphicsInitialize

public void graphicsInitialize()
                        throws java.lang.Exception

Description copied from interface: RrdStrategy

This Initializes the graphics subsystem only. This is used by the web application to avoid the need for the JNI infrastructure in the webapp.

Specified by:

graphicsInitialize in interface RrdStrategy

Throws:

java.lang.Exception

fetchLastValue

public java.lang.Double fetchLastValue(java.lang.String fileName,
                                       int interval)
                                throws java.lang.NumberFormatException,
                                       RrdException

Fetch the last value from the JRobin RrdDb file.

Specified by:

fetchLastValue in interface RrdStrategy

Parameters:

fileName - a name the represents a round robin database

interval - a step interval of the round robin database

Returns:

The last value as a Double (if the last value didn't exist returns a Double.NaN)

Throws:

java.lang.NumberFormatException

RrdException

getColor

private java.awt.Color getColor(java.lang.String colorValue)

tokenize

private java.lang.String[] tokenize(java.lang.String line,
                                    java.lang.String delims,
                                    boolean processQuoted)

createGraph

public java.io.InputStream createGraph(java.lang.String command,
                                       java.io.File workDir)
                                throws java.io.IOException,
                                       RrdException

This constructs a graphDef by parsing the rrdtool style command and using the values to create the JRobin graphDef. It does not understand the 'AT style' time arguments however. Also there may be some rrdtool parameters that it does not understand. These will be ignored. The graphDef will be used to construct an RrdGraph and a PNG image will be created. An input stream returning the bytes of the PNG image is returned.

Specified by:

createGraph in interface RrdStrategy

Parameters:

command - the command needed to create the graph

workDir - the directory that all referenced files are relative to

Returns:

an input stream representing the bytes of a graph image as a PNG file

Throws:

RrdException - if an RRD error occurs

java.io.IOException - if an IOError occurs

getStats

public java.lang.String getStats()

This implementation does not track and stats.

Specified by:

getStats in interface RrdStrategy

Returns:

a non-null string representing any staticstics to be included in the logs