我有这个简单的管道配置。只是尝试修改Spring Integration。但是，输出结果很奇怪。
这是我的代码：
@Slf4j
@Configuration
@RequiredArgsConstructor
public class FileToConsoleIntegration {
@Bean public IntegrationFlow fileToConsoleIntegrationFlow() {
return IntegrationFlows.from(sameSourceDirectory(), spec -> spec.poller(this::getPollerSpec))
.log(LoggingHandler.Level.WARN, "before.sort", m -> m.getHeaders().get("file_name"))
.channel(MessageChannels.queue(5))
.log(LoggingHandler.Level.INFO, "after.sort", m -> m.getHeaders().get("file_name"))
.channel(alphabeticallyReversed())
.log(LoggingHandler.Level.ERROR, "after.sort", m -> m.getHeaders().get("file_name"))
.handle(logInfoMessageHandler())
.get();
}
private PollerSpec getPollerSpec(PollerFactory p) {
return p
.fixedRate(1000)
.maxMessagesPerPoll(10);
}
@Bean public MessageSource<File> sameSourceDirectory() {
FileReadingMessageSource messageSource = new FileReadingMessageSource();
messageSource.setDirectory(new File("input_dir"));
return messageSource;
}
@Bean public MessageHandler logInfoMessageHandler() {
return message ->
log.info("Handling message with headers: {} and payload: {}",
message.getHeaders(), message.getPayload());
}
@Bean
public PriorityChannel alphabeticallyReversed() {
return MessageChannels.priority()
.capacity(5)
.comparator(Comparator.comparing(getFilename(), Comparator.reverseOrder()))
.get();
}
private Function<Message<?>, String> getFilename() {
return a -> (String) a.getHeaders().get("file_name");
}
}
这是我的输入内容
/input_dir
01_zhasdfha.txt
02_usfhahjf.txt
05_bsdfasdf.txt
06_asdfasdf.txt
这是我的输出：
2019-10-10 17:24:48.604 WARN 46024 --- [ask-scheduler-1] before.sort : 01_zhasdfha.txt
2019-10-10 17:24:48.605 INFO 46024 --- [ask-scheduler-1] after.sort : 01_zhasdfha.txt
2019-10-10 17:24:48.605 ERROR 46024 --- [ask-scheduler-2] after.sort : 01_zhasdfha.txt
2019-10-10 17:24:48.605 WARN 46024 --- [ask-scheduler-1] before.sort : 02_usfhahjf.txt
2019-10-10 17:24:48.605 INFO 46024 --- [ask-scheduler-1] after.sort : 02_usfhahjf.txt
2019-10-10 17:24:48.606 WARN 46024 --- [ask-scheduler-1] before.sort : 05_bsdfasdf.txt
2019-10-10 17:24:48.606 ERROR 46024 --- [ask-scheduler-2] after.sort : 02_usfhahjf.txt
2019-10-10 17:24:48.606 INFO 46024 --- [ask-scheduler-1] after.sort : 05_bsdfasdf.txt
2019-10-10 17:24:48.606 ERROR 46024 --- [ask-scheduler-2] after.sort : 05_bsdfasdf.txt
2019-10-10 17:24:48.606 WARN 46024 --- [ask-scheduler-1] before.sort : 06_asdfasdf.txt
2019-10-10 17:24:48.606 INFO 46024 --- [ask-scheduler-1] after.sort : 06_asdfasdf.txt
2019-10-10 17:24:48.606 ERROR 46024 --- [ask-scheduler-2] after.sort : 06_asdfasdf.txt
2019-10-10 17:24:48.605 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/01_zhasdfha.txt, id=5fcfb1cc-7187-86a8-dcf4-23e9b31b2376, file_name=01_zhasdfha.txt, file_relativePath=01_zhasdfha.txt, timestamp=1570728288603} and payload: input_dir/01_zhasdfha.txt
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/06_asdfasdf.txt, id=cf1a978b-c577-bb14-cf45-cf5b7ce8f2a7, file_name=06_asdfasdf.txt, file_relativePath=06_asdfasdf.txt, timestamp=1570728288606} and payload: input_dir/06_asdfasdf.txt
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/05_bsdfasdf.txt, id=c81dbcdc-6dd0-b549-4923-fe567ff6ca23, file_name=05_bsdfasdf.txt, file_relativePath=05_bsdfasdf.txt, timestamp=1570728288606} and payload: input_dir/05_bsdfasdf.txt
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/02_usfhahjf.txt, id=3371143b-a097-a9ee-e303-d4d359875188, file_name=02_usfhahjf.txt, file_relativePath=02_usfhahjf.txt, timestamp=1570728288605} and payload: input_dir/02_usfhahjf.txt
2019-10-10 17:24:48.609 INFO 46024 --- [ main] c.s.i.siexample.SiExampleApplication : Started SiExampleApplication in 0.743 seconds (JVM running for 1.232)
所需的输出：
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/06_asdfasdf.txt, id=cf1a978b-c577-bb14-cf45-cf5b7ce8f2a7, file_name=06_asdfasdf.txt, file_relativePath=06_asdfasdf.txt, timestamp=1570728288606} and payload: input_dir/06_asdfasdf.txt
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/05_bsdfasdf.txt, id=c81dbcdc-6dd0-b549-4923-fe567ff6ca23, file_name=05_bsdfasdf.txt, file_relativePath=05_bsdfasdf.txt, timestamp=1570728288606} and payload: input_dir/05_bsdfasdf.txt
2019-10-10 17:24:48.607 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/02_usfhahjf.txt, id=3371143b-a097-a9ee-e303-d4d359875188, file_name=02_usfhahjf.txt, file_relativePath=02_usfhahjf.txt, timestamp=1570728288605} and payload: input_dir/02_usfhahjf.txt
2019-10-10 17:24:48.605 INFO 46024 --- [ask-scheduler-3] c.s.i.s.i.FileToConsoleIntegration : Handling message with headers: {file_originalFile=input_dir/01_zhasdfha.txt, id=5fcfb1cc-7187-86a8-dcf4-23e9b31b2376, file_name=01_zhasdfha.txt, file_relativePath=01_zhasdfha.txt, timestamp=1570728288603} and payload: input_dir/01_zhasdfha.txt
所需输出和当前输出之间的差异在于订单混乱。我该如何解决？
答案 0 :(得分：1)
仅因为您已将队列大小设置为5，并不意味着框架将在下游轮询器将其拉出之前等待所有5个。如果有轮询器在等待消息（默认是每次轮询最多等待1秒），则它将立即收到。您可以尝试将轮询器的接收超时设置为0，但是仍然存在（小）竞争情况，在该情况下可以比预期的更早获取消息。
最好使用聚合器，然后使用转换器对List<>（或聚合器上的自定义输出处理器）进行排序，然后再使用拆分器。