Key Terms with references

• Job – Contains steps for the process execution (describes what job is and how it is executed). It is entire set of batch work.
• Job Instance – Represents the given job during the execution process (organises the job process with job parameters)
• Job Parameters – are type properties that are parameters for the job instance.
• Job Execution – is what happend during job run (i.e. status, failures etc.) – Each run of Job Instance results in Job Execution.
• Step Execution – is a run of a single step execution in Job Instance.
• Job Repository – represents a persistent store (i.e. database) for the jobs to run.
• Tasklet – is to setup or cleanup resources before the main business logic is executed.
• Job Launcher – is responsible for starting a Job with given job parameters

Example

We will be using SimpleJobLauncher that relies on a TaskExecutor to launch the jobs. If there is no specific TaskExecutor is set then a SyncTaskExecutor is used. We will use the SimpleJobRepository implementation which requires a set of execution Daos to store its information.

Tasklet Example

public class PrintTasklet implements Tasklet
{
private String message;
public void setMessage(String message)
{
this.message = message;
}
public ExitStatus execute() throws Exception
{
System.out.println("**** "+message+" ******");
return ExitStatus.FINISHED;
}
}

Luncher Context Example

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<property name="jobRepository" ref="jobRepository"/>
</bean>
<bean id="jobRepository" class="org.springframework.batch.core.repository.support.SimpleJobRepository">
<constructor-arg>
<bean class="org.springframework.batch.core.repository.dao.MapJobInstanceDao"/>
</constructor-arg>
<constructor-arg>
<bean class="org.springframework.batch.core.repository.dao.MapJobExecutionDao" />
</constructor-arg>
<constructor-arg>
<bean class="org.springframework.batch.core.repository.dao.MapStepExecutionDao"/>
</constructor-arg>
</bean>
</beans>

Job XML Example

 
<bean id="hello" class="eg.spring.batch.PrintTasklet">
<property name="message" value="Hello"/>
</bean>
<bean id="space" class="eg.spring.batch.PrintTasklet">
<property name="message" value=" "/>
</bean>
<bean id="world" class="eg.spring.batch.PrintTasklet">
<property name="message" value="World!"/>
</bean>
<bean id="taskletStep" abstract="true"
class="org.springframework.batch.core.step.tasklet.TaskletStep">
<property name="jobRepository" ref="jobRepository"/>
</bean>
<bean id="simpleJob" class="org.springframework.batch.core.job.SimpleJob">
<property name="name" value="simpleJob" />
<property name="steps">
<list>
<bean parent="taskletStep">
<property name="tasklet" ref="hello"/>
</bean>
<bean parent="taskletStep">
<property name="tasklet" ref="space"/>
</bean>
<bean parent="taskletStep">
<property name="tasklet" ref="world"/>
</bean>
</list>
</property>
<property name="jobRepository" ref="jobRepository"/>
</bean>
</beans>

Running the Example

Download spring batch version 1.2 and add all the jars into the classpath. Also add in launcherContext.xml and simpleJob.xml in classpath as well as PrintTaskLet.class or in a jar file. Ensure that PrintTasklet class is in package “eg.spring.batch”.
Then from command prompt:
java org.springframework.batch.core.launch.support.CommandLineJobRunner simpleJob.xml simpleJob

Resourcess

• http://static.springsource.org/spring-batch/

You can open a link in a new window using HTML.

This is a little better than JavaScript as it will work whether the browser has JavaScript enabled or not.

You implement this by adding the text target=”_blank” to your anchor tag that you want to open in the new window.

For example:

<a href="http://www.bestfreetips.co.uk/" target="_blank">Click here to visit Best Free Tips site in a new Browser Window</a>

LESS runs on both the client-side (IE6+, Firefox etc..) and server-side. LESS was developed by Alexis Sellier known as cloudhead.

In this quick basic guide I will be discussing only how to use LESS on client-side. With example of of variables, operators, mix-ins and nested selectors.

First you need to download the latest version of less.js from github.com. Version 1.1.3 is latest at the time of writing.

You need to create stylesheet in a file with .less extension (i.e style.less) and save the following content.

// LESS stylesheet
// VARIABLES
@font-color: #FF0000;
@header-font-size: 26px;
@base-font-size: 12px;
#content {
h1 {
font-size: @header-font-size;
font-weight: bold;
}
p {
font-size: @base-font-size;
color: @font-color;
}
// NESTED
div {
a {
text-decoration: none;
&:hover {
font-weight: bold;
color: @font-color;
}
}
}
// OPERATORS
#footer {
color: @font-color + #0033FF;
}
// FUNCTIONS
.font-sizer (@size: 12px) {
font-size: @size;
}
#functionEx {
.font-sizer;
}
#functionEx2 {
.font-sizer(30px);
}
}

Html File

You need to copy the following content and save it in a html file.

Styled page with LESS
<script src="less-1.1.3.min.js" type="text/javascript"></script>
<div id="content">
<h1>Page Header</h1>
Welcome to my LESS styled page!
<div>More content and <a href=".">links</a></div>
<div id="footer">Footer content goes here</div>
<div id="functionEx">Usage of function with default font size</div>
<div id="functionEx2">Usage of function with parameter</div>
</div>

Click here to see See LESS in Action

Resourcess

• http://lesscss.org
• http://fadeyev.net/2010/06/19/lessjs-will-obsolete-css/
• http://www.greenwoodsoftware.com/less/index.html