Quartz Cron Expressions

The documentation can be found here -
http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/crontrigger.html

Comments

Post a Comment

Popular posts from this blog

JPA Vs SpringJDBC

Recently I conducted many interviews for my employer, one 8-9 yrs exp candidate asked me what data access object layer do we use in our project. I was thinking a bit as , like they do with persistence - polyglot persistence, we maintain different DAO technologies - JPA, proprietary JDBC, JDO, Spring JDBC. you cannot say which one is the best. It depends on the context but definitely having so many things for performing dataaccess is not advisable. In this topic I will try to explore the JPA and Spring JDBC. Spring is a life savior, it's template concept reduces the boilerplate code but still the jdbc template comes with baggages - row mapper, SQL, parameters etc. If you have good knowledge of database schema, you want to execute stored procedure, you want more handle on your code to access the db. Then go for Spring, you can debug easily and have control on your DTO. If you need to abstract away the SQL, hide complexity, write less code, dont need to execute the stored proced...
Read more

LogStash 5.X Windows service creation

Elastic has changed the command line arguments of logstash. To create a new logstash 5 windows service you have to follow these steps - $logstash_install_location represents the location of Logstash folder. logstash is the service name browse the  $logstash_install_location folder and create two folders conf and logs conf contains all configuration files of logstash. you dont have to change a single file, you can keep as many files you want. such as one for windows logs conf , one for java logs Open command prompt and locate the folder where NSSM exe file is put. then issue the following commands one after another. nssm install logstash $logstash_install_location \bin\logstash.bat nssm set logstash AppParameters --path.config $logstash_install_location\ conf nssm set logstash AppDirectory $logstash_install_location\ nssm set logstash AppStdout $logstash_install_location \logs\sysout.log nssm set logstash AppStderr $logstash_install_location \...
Read more

GWT, MVP and Eventbus

I have been using GWT and MVP for 2 years and so. I loved the way MVP provides flexibility of working with multiple views. In GWT or Swing based application design muddles very quickly.  Maintenance becomes nightmare. We don’t think about the separation of concern, then mix up the UI code and business logic together. MVP (Model View Presenter) proposes following things - ·     View is an interface which is a contract for presenter. here you can define the operations and expose widgets that will be present in the UI. for example if an UI needs an input box for user name and  a  button then you can expose two methods getName() and getOkButton().  Get name can be implemented using whatever widget user wants- a textbox or a custom widget. ·     View implementaion implements the view interface and only concentrate on layout or grouping of widgets. Doesn't perform and logic, doesnt attach any DOM handler to any wi...
Read more