11.5 Servlet 3.0 Async - Reference Documentation
Authors: Graeme Rocher, Peter Ledbrook, Marc Palmer, Jeff Brown, Luke Daley, Burt Beckwith, Lari Hotari
Version: 3.1.9
11.5 Servlet 3.0 Async
In addition to the higher level async features discussed earlier in the section, you can access the raw Servlet 3.0 asynchronous API from a Grails application.Servlet 3.0 Asynchronous Rendering
You can render content (templates, binary data etc.) in an asynchronous manner by calling thestartAsync method which returns an instance of the Servlet 3.0 AsyncContext. Once you have a reference to the AsyncContext you can use Grails' regular render method to render content:def index() {
def ctx = startAsync()
ctx.start {
new Book(title:"The Stand").save()
render template:"books", model:[books:Book.list()]
ctx.complete()
}
}complete() method to terminate the connection.Resuming an Async Request
You resume processing of an async request (for example to delegate to view rendering) by using thedispatch method of the AsyncContext class:def index() {
def ctx = startAsync()
ctx.start {
// do working
…
// render view
ctx.dispatch()
}
}