info.magnolia.module.delta
Class AbstractConditionalRepositoryTask

java.lang.Object
  extended by info.magnolia.module.delta.AbstractTask
      extended by info.magnolia.module.delta.AbstractRepositoryTask
          extended by info.magnolia.module.delta.AbstractConditionalRepositoryTask
All Implemented Interfaces:
Task

public abstract class AbstractConditionalRepositoryTask
extends AbstractRepositoryTask

An abstract implementation of a RepositoryTask that only needs to be executed when a specific node is not found in the repository. Can be used to easily create self-check tasks for mandatory configuration.

Version:
$Id$

Constructor Summary
AbstractConditionalRepositoryTask(String name, String description)
           
 
Method Summary
 void execute(InstallContext ctx)
          A good-citizen task should execute itself responsibly: it should know what to do in case of problems: for instance, fixable or irrelevant issues should usually just be logged used the InstallContext methods, when the user can fix them later on.
abstract  String getCheckedPath()
          Returns a path in a repository in the form repository:path (e.g.
 
Methods inherited from class info.magnolia.module.delta.AbstractRepositoryTask
doExecute
 
Methods inherited from class info.magnolia.module.delta.AbstractTask
getDescription, getName, toString
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

AbstractConditionalRepositoryTask

public AbstractConditionalRepositoryTask(String name,
                                         String description)
Parameters:
name - task name
description - task description
Method Detail

getCheckedPath

public abstract String getCheckedPath()
Returns a path in a repository in the form repository:path (e.g. config:server/activation) that will checked. Only if such path doesn't exist, doExecute() will be called.

Returns:
repository:path string

execute

public void execute(InstallContext ctx)
             throws TaskExecutionException
A good-citizen task should execute itself responsibly: it should know what to do in case of problems: for instance, fixable or irrelevant issues should usually just be logged used the InstallContext methods, when the user can fix them later on. The task could also potentially do backups of nodes it needs to modify extensively, so the user could refer to the backups in case of problem. In the event of an unrecoverable issue, the Task could also throw a TaskExecutionException, knowing that will cancel the whole module's installation, update and startup. If a TaskExecutionException must be thrown, keep in mind that the exception message will still be shown to the end user, so try to keep them human readable.

Specified by:
execute in interface Task
Overrides:
execute in class AbstractRepositoryTask
Throws:
TaskExecutionException


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