Package org.springframework.batch.poller

Class DirectPoller<S>

java.lang.Object

org.springframework.batch.poller.DirectPoller<S>

Type Parameters:

S - the type of the result

All Implemented Interfaces:

Poller<S>

public class DirectPoller<S>
extends Object
implements Poller<S>

A Poller that uses the callers thread to poll for a result as soon as it is asked for. This is often appropriate if you expect a result relatively quickly, or if there is only one such result expected (otherwise it is more efficient to use a background thread to do the polling).

Author:

Dave Syer

Constructor Summary

Constructors

Constructor	Description
DirectPoller(long interval)

Method Summary

Modifier and Type	Method	Description
Future<S>	poll(Callable<S> callable)	Get a future for a non-null result from the callback.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DirectPoller

public DirectPoller(long interval)

Method Details

poll

public Future<S> poll(Callable<S> callable)
               throws Exception

Get a future for a non-null result from the callback. Only when the result is asked for (using Future.get() or Future.get(long, TimeUnit) will the polling actually start.

Specified by:

poll in interface Poller<S>

Parameters:

callable - a Callable to use to retrieve a result

Returns:

a future which itself can be used to get the result

Throws:

Exception - allows for checked exceptions

See Also:

• Poller.poll(Callable)