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  * Copyright 2006-2010 the original author or authors.
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.springframework.batch.poller;
Interface for polling a java.util.concurrent.Callable instance provided by the user. Use when you need to put something in the background (e.g. a remote invocation) and wait for the result, e.g.
 Poller<Result> poller = ...
 final long id = remoteService.execute(); // do something remotely
 Future<Result> future = poller.poll(new Callable<Result> {
     public Object call() {
         // Look for the result (null if not ready)
         return remoteService.get(id);
 Result result = future.get(1000L, TimeUnit.MILLSECONDS);

Dave Syer
public interface Poller<T> {

Use the callable provided to poll for a non-null result. The callable might be executed multiple times searching for a result, but once either a result or an exception has been observed the polling stops.

callable a java.util.concurrent.Callable to use to retrieve a result
a future which itself can be used to get the result
	Future<T> poll(Callable<T> callablethrows Exception;
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