Knime

From Pigbert Wiki

Code can be found under C:\cygwin\home\yz\knime\workspace\KnimeBasic\src\org\knime\base

Source
Sink
Learner
Predictor
Manipulator
Visualizer
Meta
Other

Command Line

-nosave => do not save the workflow after execution has finished
-reset => reset workflow prior to execution
-masterkey[=...] => prompt for master password (used in e.g. database nodes), if provided with argument, use argument instead of prompting
-workflowFile=... => ZIP file with a ready-to-execute workflow in the root of the ZIP
-workflowDir=... => directory with a ready-to-execute workflow
-destFile=... => ZIP file where the executed workflow should be written to if omitted the workflow is only saved in place
-option=nodeID,name,value,type => set the option with name name of the node with ID nodeID to the given value, which has type type. type can be any of the primitive Java types, String or any of StringCell, DoubleCell, or IntCell. If name addresses a nested element (for instance rowFilter -> ColValRowFilterUpperBound), the entire path must be given, separated by "/". If the node is part of a meta node, provide also the node ids of the parent node(s). e.g. 90/56.

Some KNIME settings can also be adjusted by Java properties; they need to be provided as last option in the command line: -vmargs -Dorg.knime.core.maxThread=n sets the maximum number of threads used by KNIME

Log4j

A short introduction (http://logging.apache.org/log4j/1.2/manual.html)
Log4j Xml Format (http://wiki.apache.org/logging-log4j/Log4jXmlFormat)
Log4j API (http://logging.apache.org/log4j/1.2/apidocs/index.html?org/apache/log4j/ConsoleAppender.html)
Pattern Layout (http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html)
Log By Level (http://wiki.apache.org/logging-log4j/_LogByLevel_)
FAQ1 (http://logging.apache.org/log4j/1.2/faq.html#2.3) [Wiki FAQ]

Threshold

all (-2147483648)
debug (10000)
info (20000)
warn (30000)
error (40000)
fatal (50000)
off (2147483647)
null ()

In Java Console
----------------
logger.warn
logger.coding
logger.error
logger.info
logger.debug    (System.out)


=================================================
In Knime Console
-----------------
logger.warn     (System.out)
logger.coding   (System.err)
logger.error    (System.err)


// controlled by C:\cygwin\home\yz\knime\workspace\.metadata\knime <-- to be changed
// controlled by C:\cygwin\home\yz\knime\runtime_configuration\.metadata\knime
=================================================

Debugging

setWarningMessage(String)

Wizard

Node Creation Wizard

In KNIME perspective:

File => New => Other => Konstanz Information Miner => Create a new KNIME Node-Extension

Java build path correction

Project => Clean => Clean projects slected below

Node Testing

Run => Run ... => Eclipse Application => New configuration

Deployment

This is done with "File" -> Export..." -> Choose "Deployable plug-ins and fragments" -> select your project which contains the node(s) you want to export -> Choose an export destination (knime/plugins), in the options tab select whether you want to include the source code or not -> "Finish".

Eclipse plugin files

Knime's connection with Eclipse workbench:

the editor
preferences page
perspective-extension points

plugin.xml

specifies the new extension points

category extension: To introduce new category folders displayed in the node repository: Extensions => add... => org.knime.workbench.repository.categories

node extension: To add a new functional node to the node repository: Extensions => add... => org.knime.workbench.repository.nodes

META-INF/MANIFEST.MF

class path information

required plugins information: Dependencies => Required Plug-ins

vendor and version information

which java packages should be made visible outside

build.properties

configures the way a plugin is exported(deployed)

defines the name of the jar file in which the classes of the plugin should be stored as well as the files to be included in deployment: Runtime => Exported Packages

enables you to define two build settings

includes source code Build => Source Build

no source code Build => Binary Build

MyNodePlugin.java

required by eclipse "Bundle Activator". It has nothing to do with the functionality of the node.

specified/connected through META-INF/MANIFEST.MF => Overview => Activator => pigbert.knime.rsknn.RSKnnNodePlugin

Functional Node Class Structure

NodeView

how to display the result of the node.

NodeFactory

NodePlugin

Example Code

Inner Class (Single) Cell Factory

        ColumnRearranger result = new ColumnRearranger(metaIn);
        DataColumnSpecCreator creator = new DataColumnSpecCreator(predictionColumnName, DoubleCell.TYPE);
        SingleCellFactory predictionCellFactory = new SingleCellFactory(creator.createSpec()) {
            @Override
            public DataCell getCell(final DataRow row) {
                DataCell cell = predictionResults.get(row.getKey());
                return (cell == null ? DataType.getMissingCell() : cell);
            }
        };
        result.append(predictionCellFactory);

Data Representation in Knime (http://www.knime.org/docs/api/org/knime/core/data/doc-files/newtypes.html)

Retrieved from "http://www.pigbert.net/wiki/Knime"