org.opennms.netmgt.rrd.rrdtool

Class AbstractJniRrdStrategy<D,F>

java.lang.Object

org.opennms.netmgt.rrd.rrdtool.AbstractJniRrdStrategy<D,F>

All Implemented Interfaces:

RrdStrategy<D,F>

Direct Known Subclasses:

JniRrdStrategy, MultithreadedJniRrdStrategy

public abstract class AbstractJniRrdStrategy<D,F>
extends Object
implements RrdStrategy<D,F>

Constructor Summary

Constructors

Constructor and Description
AbstractJniRrdStrategy()

Method Summary

Modifier and Type	Method and Description
InputStream	createGraph(String command, File workDir) Creates an InputStream representing the bytes of a graph created from round robin data.
RrdGraphDetails	createGraphReturnDetails(String command, File workDir) Creates an RrdGraphDetails object representing the graph created from round robin data.
String	getDefaultFileExtension() getDefaultFileExtension
int	getGraphLeftOffset() getGraphLeftOffset
int	getGraphRightOffset() getGraphRightOffset
int	getGraphTopOffsetWithText() getGraphTopOffsetWithText
String	getStats() No stats are kept for this implementation.
void	promoteEnqueuedFiles(Collection<String> rrdFiles) In the event that this is a queuing implementation of the RrdStrategy.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opennms.netmgt.rrd.RrdStrategy

closeFile, createDefinition, createFile, fetchLastValue, fetchLastValue, fetchLastValueInRange, openFile, setConfigurationProperties, updateFile

Constructor Detail

AbstractJniRrdStrategy

public AbstractJniRrdStrategy()

Method Detail

createGraph

public InputStream createGraph(String command,
                               File workDir)
                        throws IOException,
                               RrdException

Creates an InputStream representing the bytes of a graph created from round robin data. It accepts an rrdtool graph command. The underlying implementation converts this command to a format appropriate for it . Executes the given graph command as process with workDir as the current directory. The output stream of the command (a PNG image) is copied to a the InputStream returned from the method.

Specified by:

createGraph in interface RrdStrategy<D,F>

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:

IOException - if an IOError occurs

RrdException - if an RRD error occurs

getGraphLeftOffset

public int getGraphLeftOffset()

getGraphLeftOffset

Specified by:

getGraphLeftOffset in interface RrdStrategy<D,F>

Returns:

a int.

getGraphRightOffset

public int getGraphRightOffset()

getGraphRightOffset

Specified by:

getGraphRightOffset in interface RrdStrategy<D,F>

Returns:

a int.

getGraphTopOffsetWithText

public int getGraphTopOffsetWithText()

getGraphTopOffsetWithText

Specified by:

getGraphTopOffsetWithText in interface RrdStrategy<D,F>

Returns:

a int.

getStats

public String getStats()

No stats are kept for this implementation.

Specified by:

getStats in interface RrdStrategy<D,F>

Returns:

a String object.

getDefaultFileExtension

public String getDefaultFileExtension()

getDefaultFileExtension

Specified by:

getDefaultFileExtension in interface RrdStrategy<D,F>

Returns:

a String object.

createGraphReturnDetails

public RrdGraphDetails createGraphReturnDetails(String command,
                                                File workDir)
                                         throws IOException,
                                                RrdException

Creates an RrdGraphDetails object representing the graph created from round robin data. It accepts an rrdtool graph command. The underlying implementation converts this command to a format appropriate for it .

Specified by:

createGraphReturnDetails in interface RrdStrategy<D,F>

Parameters:

command - the command needed to create the graph

workDir - the directory that all referenced files are relative to

Returns:

details for the graph including an InputStream, any PRINTed lines, and graph dimensions.

Throws:

IOException - if an IOError occurs

RrdException - if an RRD error occurs

promoteEnqueuedFiles

public void promoteEnqueuedFiles(Collection<String> rrdFiles)

In the event that this is a queuing implementation of the RrdStrategy. This method causes all queued but not yet written data to be to the rrd files as soon as possible.

Specified by:

promoteEnqueuedFiles in interface RrdStrategy<D,F>

Parameters:

rrdFiles - a Collection object.