How to pass instance variables into Quartz job?

Question

I wonder how to pass an instance variable externally in Quartz?

Below is pseudo code I would like to write. How can I pass externalInstance into this Job?

Answer 1

Quartz has a simple way to grep params from JobDataMap using setters

I am using Quartz 2.3 and I simply used setter to fetch passed instance objects

For example I created this class

public class Data implements Serializable {
    @JsonProperty("text")
    private String text;

    @JsonCreator
    public Data(@JsonProperty("b") String text) {this.text = text;}

    public String getText() {return text;}
}

Then I created an instance of this class and put it inside the JobDataMap

JobDataMap jobDataMap = new JobDataMap();
jobDataMap.put("data", new Data(1, "One!"));
JobDetail job = newJob(HelloJob.class)
                .withIdentity("myJob", "group")
                .withDescription("bla bla bla")
                .usingJobData(jobDataMap) // 

And my job class looks like this

public class HelloJob implements Job {
    Data data;

    public HelloJob() {}

    public void execute(JobExecutionContext context)
            throws JobExecutionException
    {
        String text = data.getText();
        System.out.println(text);
    }

    public void setData(Data data) {this.data = data;}
}

• Note: it is mandatory that the field and the setter matched the key

This code will print One! when you schedule the job.

That's it, clean and efficient