spring-batch Poller 源码
spring-batch Poller 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/poller/Poller.java
/*
* Copyright 2006-2018 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
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.batch.poller;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
/**
* Interface for polling a {@link 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.
*
* <pre>
* 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.MILLISECONDS);
* </pre>
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
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.
* @param callable a {@link Callable} to use to retrieve a result
* @return a future which itself can be used to get the result
* @throws java.lang.Exception allows for checked exceptions
*/
Future<T> poll(Callable<T> callable) throws Exception;
}
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