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 java.lang.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

DirectPoller(long interval)

Method Summary

java.util.concurrent.Future<S>

poll(java.util.concurrent.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 Detail

DirectPoller

public DirectPoller(long interval)

Method Detail

poll

public java.util.concurrent.Future<S> poll(java.util.concurrent.Callable<S> callable)
                                    throws java.lang.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:

java.lang.Exception

See Also:

Poller.poll(Callable)