Package org.opennms.netmgt.rrd

Interface RrdStrategy<D,​F>

    • Method Detail

      • setConfigurationProperties

        void setConfigurationProperties​(Properties props)

        setConfigurationProperties

        Parameters:
        props - a Properties object.

      • getDefaultFileExtension

        String getDefaultFileExtension()
        Get the file extension appropriate for files of this type
        Returns:
        a String object.

      • createDefinition

        D createDefinition​(String creator,
                   String directory,
                   String rrdName,
                   int step,
                   List<RrdDataSource> dataSources,
                   List<String> rraList)
            throws Exception
        Create a round robin database definition from the supplied parameters. This definition is used in the createFile call to create the actual file.
        Parameters:
        creator - - A string representing who is creating this file for use in log msgs
        directory - - The directory to create the file in
        rrdName - - The name to use for the round robin database
        step - - the step for the database
        dataSources - - the data sources to use for round robin database
        rraList - - a List of the round robin archives to create in the database. defines after which time the data is condensed to a defined lower step
        Returns:
        an object representing the definition of an round robin database. Can be null if the database exists already.
        Throws:
        Exception - If an error occurs while creating the definition

      • createFile

        void createFile​(D rrdDef)
         throws Exception
        Creates the round robin database defined by the supplied definition. Should be able to handle rrdDef being null.
        Parameters:
        rrdDef - an round robin database definition created using the createDefinition call.
        Throws:
        Exception - if an error occurs create the file

      • openFile

        F openFile​(String fileName)
    throws Exception
        Opens the round robin database with the supplied name. It is assumed the name refers to a round robin database appropriate for this strategy implementation
        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:
        Exception - if an error occurs opening the file

      • updateFile

        void updateFile​(F rrd,
                String owner,
                String data)
         throws Exception
        Updates the supplied round robin database with the given timestamp:value point
        Parameters:
        rrd - an rrd object created using openFile
        owner - the owner of the rrd
        data - a string of the form :
        Throws:
        Exception - if an error occurs updating the file

      • closeFile

        void closeFile​(F rrd)
        throws Exception
        This closes the supplied round robin database
        Parameters:
        rrd - an rrd object created using openFile
        Throws:
        Exception - if an error occurs closing the file

      • fetchLastValue

        Double fetchLastValue​(String rrdFile,
                      String ds,
                      int interval)
               throws NumberFormatException,
                      RrdException
        Fetches the last value from the round robin database with the given name. The interval passed in should be the interval associated with the round robin database.
        Parameters:
        rrdFile - a name the represents a round robin database
        ds - a name the represents a data source to be used
        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:
        NumberFormatException - if any.
        RrdException - if any.

      • fetchLastValue

        Double fetchLastValue​(String rrdFile,
                      String ds,
                      String consolidationFunction,
                      int interval)
               throws NumberFormatException,
                      RrdException
        Fetches the last value from the round robin database with the given name. The interval passed in should be the interval associated with the round robin database.
        Parameters:
        rrdFile - a name the represents a round robin database
        ds - a name the represents a data source to be used
        interval - a step interval of the round robin database
        consolidationFunction - a String object.
        Returns:
        The last value as a Double (if the last value didn't exist returns a Double.NaN)
        Throws:
        NumberFormatException - if any.
        RrdException - if any.

      • fetchLastValueInRange

        Double fetchLastValueInRange​(String rrdFile,
                             String ds,
                             int interval,
                             int range)
                      throws NumberFormatException,
                             RrdException
        Fetches the last value from the round robin database with the given name within a time range. The interval passed in should be the interval associated with the round robin database. The range should be the amount of "lag" acceptable for an update to be considered valid. Range must be a multiple of the RRD interval.
        Parameters:
        rrdFile - a name the represents a round robin database
        ds - a name the represents a data source to be used
        interval - a step interval of the round robin database
        range - an acceptable range for which the last value will be returned
        Returns:
        The last value as a Double (if the last value didn't exist returns a Double.NaN)
        Throws:
        NumberFormatException - if any.
        RrdException - if any.

      • createGraph

        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 .
        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

      • createGraphReturnDetails

        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 .
        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

      • getGraphLeftOffset

        int getGraphLeftOffset()
        Returns the number of pixels that the leftt-hand side of the graph is offset from the left side of the created image. The offset should always be positive.
        Returns:
        offset in pixels. Should always be positive.

      • getGraphRightOffset

        int getGraphRightOffset()
        Returns the number of pixels that the right-hand side of the graph is offset from the right side of the created image. The offset should always be negative.
        Returns:
        offset in pixels. Should always be negative.

      • getGraphTopOffsetWithText

        int getGraphTopOffsetWithText()
        Returns the number of pixels that the top of the graph is offset from the top of the created image if there is single line of header text. The offset should always be negative.
        Returns:
        offset in pixels. Should always be negative.

      • getStats

        String getStats()
        Provides the round robin database an opportunity to contribute statistics information to the logs file.
        Returns:
        a non-null string representing any statistics to be included in the logs

      • promoteEnqueuedFiles

        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.
        Parameters:
        rrdFiles - a Collection object.