Question

I’m new to Grails and web development. I started doing a project on Schedule management website stuff. I came across the Service concept that is provided by Grails. I understood the concept, but still I have confusion on when to use services.

For example, I need to implement a search module, where the manager can search for a user to find his schedules. In this case it will be good to implement it as a controller or as a service?

So,

• When and where should I use Service?

Answer 1

What and where I should use Service?

When you want your controller do to something that may be reused by other controllers
In our application we’re doing a functional separation of service. We have a CorePersistanceService, which provides method to create, delete, update and manipulate Core Domain Classes (core for us).

I think persistance services are a good way to reuse GORM code throughout Grails code. You can create method in domain classes, but I don’t like that, it’s way less maintanable I think

We have a PDFService class for our PDF creation, a SolrService which connect to Solr, a Statisticservice that gather all our methods which collects statictics on our datas

Services in Grails are a manner to gather methods around a particular functional theme, in order to give possibility to reuse them in controllers (I forgot to mention our SecurityService, which is a pretty good Cross-Applications Example)