com.wolfram.jlink.util
Class MathematicaTask

java.lang.Object
  extended by org.apache.tools.ant.ProjectComponent
      extended by org.apache.tools.ant.Task
          extended by com.wolfram.jlink.util.MathematicaTask
All Implemented Interfaces:
PacketListener, java.util.EventListener

public class MathematicaTask
extends org.apache.tools.ant.Task
implements PacketListener

MathematicaTask is an Ant task that allows you to call Mathematica from Ant build files. Ant (http://ant.apache.org) is a popular Java-based build tool.

You can run Mathematica as a processing step in your build, call Mathematica testing functions, or any other operations you desire. Because MathematicaTask lets you call back into Ant from Mathematica (e.g., to execute other tasks, set/read properties, or log messages), you can use Mathematica as a scripting language for Ant.

To use the <mathematica> task, you must include a taskdef line in your build.xml file like the following examples:

 <!-- If JLink.jar is on your system CLASSPATH: -->
 <taskdef name="mathematica" classname="com.wolfram.jlink.util.MathematicaTask"/>

 <!-- If JLink.jar is NOT on your system CLASSPATH: -->
 <taskdef name="mathematica" classname="com.wolfram.jlink.util.MathematicaTask"
           classpath="/full/path/to/JLink.jar"/> 

Attributes

Attribute Description Required
exe The path to the Mathematica kernel to launch Either exe or cmdline must be specified
cmdline The full set of MathLink command-line args to use to connect to the kernel Either exe or cmdline must be specified
runfile The path to a .m file to be run when the kernel is launched. This is convenient when you want to specify some or all of the code in a file instead of directly in the task. No
fresh Whether to start a fresh kernel for this task (if a previously-used kernel is running, it will be quit first) No, defaults to false
quit Whether to force the kernel to quit immediately after this task finishes No, defaults to false
timeout The maximum number of seconds to allow for the computation. If not finished, the kernel will be killed. No, defaults to Integer.MAX_VALUE
timeoutproperty The name of a property to set if the timeout expires. The named property will be set to true. No
failonerror Whether a MathLink error (unlikely) or a timeout should cause the build to fail. No, defaults to true

You have two ways of specifying how to launch or connect to the Mathematica kernel. Most users will use the exe parameter, which specifies the path to the kernel to launch. In rare cases you might need more control over how the kernel is launched, or you might want to connect to an already-running kernel (not launched by Ant). In such cases, you can use the cmdline parameter, which lets you specify a full set of command-line MathLink arguments (e.g., "-linkmode connect -linkname 1234 -linkprotocol tcpip").

Calling back to Ant

Your Mathematica code can use the following functions to call back into Ant:
Function Description
AntTask["taskname", taskattributes] Execute the given task, with optional attributes set in the form of "attrname"->"value" rules.
AntProperty["propertyname"] Returns the string value of the specified Ant property.
AntSetProperty["propertyname", "value"] Sets the value of the specified Ant property.
AntReference["refId"] Lookup the corresponding object by its id (such as a defined <path> element from its id atribute). Unlike AntProperty, which always returns a string, AntReference returns a JavaObject expression; to use it in your Mathematica code you will have to inspect the Ant API docs for the particular class.
AntLog["message"] Write the given message to the Ant log.
AntFail["message"] Abort the Mathematica code and cause the Ant build to fail with the given message.
Ant["objectName"] General-purpose function for obtaining a reference to a specified Ant object. The allowed object names are "Project", "Target", "Task", and "Location". Use this function when you want to make direct calls into the Ant API. The other Mathematica functions listed above are convenience functions that are implemented using the Ant[] function.

Examples

The examples below assume that you have a mathExe property defined that gives the path to the kernel to launch. Here are typical definitions of that property for various operating systems:
 <!-- Windows -->
 <property name="mathExe", value="c:/program files/wolfram research/mathematica/5.2/mathkernel"/>
 
 <!-- Linux, Unix ('math' is typically on PATH) -->
 <property name="mathExe", value="math"/>
 
 <!-- Mac OS/X -->
 <property name="mathExe", value="/Applications/Mathematica\ 5.2.app/Contents/MacOS/MathKernel"/>
This simple example loads a package and calls a function. It uses AntFail to make the Ant build fail if a testing function does not succeed.
    <target name="runMathTests">
      <mathematica exe="${mathExe}">   
        <![CDATA[
           Get["MyTestPackage`"];
           result = CallTestFunction[];
           If[!TrueQ[result],
              AntFail["Mathematica test function failed"]
           ]   
        ]]>
      </mathematica>   
    </target> 
This example demonstrates the use of AntProperty to obtain the value of an Ant property as a string in your Mathematica code.
    <property name="codeDir" value="${basedir}/MyCodeDir">
 
    <target name="propertyExample">
      <mathematica exe="${mathExe}">   
        <![CDATA[
           Get[ToFileName[AntProperty["codeDir"], "SuperPackage.m"]];
           ...   
        ]]>
      </mathematica>   
    </target> 
This example demonstrates the use of AntReference to bring a list of directories defined in a <path> element into your Mathematica code. In this case, AntReference returns an Ant Path object, the methods for which are described in the Ant API docs:
    <path id="mathPath">
       ... dirsets, pathelements, etc.
    </path>   

    <target name="refExample">
      <mathematica exe="${mathExe}">   
        <![CDATA[
           mathPathDirs = AntReference["mathPath"]@list[];
           $Path = Join[mathPathDirs, $Path];
           ...
        ]]>
      </mathematica>   
    </target> 
This example shows how to call the Ant <echo> task from Mathematica code (this is just a simple task example--there are easier ways to have Mathematica output appear in the console, including simply calling Print[]):
    <target name="scriptingExample">
      <mathematica exe="${mathExe}">   
        <![CDATA[
           For[i = 0, i < 10, i++,
              AntTask["echo", "message"->ToString[i^2]]
           ]   
        ]]>
      </mathematica>   
    </target> 

Since:
3.1

Field Summary
 
Fields inherited from class org.apache.tools.ant.Task
description, location, target, taskName, taskType, wrapper
 
Fields inherited from class org.apache.tools.ant.ProjectComponent
project
 
Constructor Summary
MathematicaTask()
           
 
Method Summary
 void addText(java.lang.String code)
           
protected  void closeKernel()
           
 void execute()
          Execute
protected  KernelLink initKernel()
           
protected  void killTimeoutThread(com.wolfram.jlink.util.MathematicaTask.TimeoutThread timeoutThread)
           
 boolean packetArrived(PacketArrivedEvent evt)
           
 void setCmdline(java.lang.String cmdLine)
           
 void setExe(java.lang.String exe)
          Attribute Setters
 void setFail(java.lang.String msg)
           
 void setFailonerror(boolean failOnError)
           
 void setFresh(boolean fresh)
           
 void setQuit(boolean quit)
           
 void setRunfile(java.lang.String runFile)
           
 void setTimeout(int seconds)
           
 void setTimeoutproperty(java.lang.String timeoutProperty)
           
protected  com.wolfram.jlink.util.MathematicaTask.TimeoutThread startTimeoutThread()
           
 
Methods inherited from class org.apache.tools.ant.Task
getDescription, getLocation, getOwningTarget, getRuntimeConfigurableWrapper, getTaskName, getTaskType, getWrapper, handleErrorFlush, handleErrorOutput, handleFlush, handleInput, handleOutput, init, isInvalid, log, log, maybeConfigure, perform, reconfigure, setDescription, setLocation, setOwningTarget, setRuntimeConfigurableWrapper, setTaskName, setTaskType
 
Methods inherited from class org.apache.tools.ant.ProjectComponent
getProject, setProject
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MathematicaTask

public MathematicaTask()
Method Detail

setExe

public void setExe(java.lang.String exe)
Attribute Setters


setCmdline

public void setCmdline(java.lang.String cmdLine)

setFresh

public void setFresh(boolean fresh)

setQuit

public void setQuit(boolean quit)

setRunfile

public void setRunfile(java.lang.String runFile)

setTimeout

public void setTimeout(int seconds)

setTimeoutproperty

public void setTimeoutproperty(java.lang.String timeoutProperty)

setFailonerror

public void setFailonerror(boolean failOnError)

addText

public void addText(java.lang.String code)

setFail

public void setFail(java.lang.String msg)

execute

public void execute()
             throws org.apache.tools.ant.BuildException
Execute

Overrides:
execute in class org.apache.tools.ant.Task
Throws:
org.apache.tools.ant.BuildException

initKernel

protected KernelLink initKernel()

closeKernel

protected void closeKernel()

startTimeoutThread

protected com.wolfram.jlink.util.MathematicaTask.TimeoutThread startTimeoutThread()

killTimeoutThread

protected void killTimeoutThread(com.wolfram.jlink.util.MathematicaTask.TimeoutThread timeoutThread)

packetArrived

public boolean packetArrived(PacketArrivedEvent evt)
                      throws MathLinkException
 

Specified by:
packetArrived in interface PacketListener
Parameters:
evt - the PacketArrivedEvent
Returns:
true
Throws:
MathLinkException


J/Link is Copyright (c) 1999-2008, Wolfram Research, Inc. All rights reserved.