我使用FileReadingMessageSource作为Spring Integration ESB中Message的源代码。
特别是我想使用WatchServiceDirectoryScanner。我使用基于Annotation的配置和spring boot。
如果我不使用WatchServiceDirectoryScanner一切都很好，但是当我设置setUseWatchService(true)时，我无法让它工作。
应用程序启动时，只有目录中存在的文件才会在通道中生成新消息。在目录中复制或创建的文件不会生成任何消息。
我想使用WatchServiceDirectoryScanner，因为我只想生成一条消息
这是我为适配器和源配置通道的代码：
@Bean(name="source")
public FileReadingMessageSource getFileMessageSource(){
FileReadingMessageSource lm = new FileReadingMessageSource();
lm.setBeanName("fileMessageSource");
lm.setDirectory(new File("C:/DestDir"));
lm.setAutoCreateDirectory(true);
lm.setFilter(new AcceptAllFileListFilter<>());
lm.setUseWatchService(true);
lm.setWatchEvents(WatchEventType.CREATE);
return lm;
}
@Bean(name="channel")
public PublishSubscribeChannel getFileChannel(){
PublishSubscribeChannel psc = new PublishSubscribeChannel();
psc.setLoggingEnabled(true);
psc.setComponentName("channelexp");
return psc;
}
@Bean
@DependsOn({"source","channel"})
public SourcePollingChannelAdapter getChannelAdapter(){
SourcePollingChannelAdapter spca = new SourcePollingChannelAdapter();
FileReadingMessageSource frms = context.getBean(FileReadingMessageSource.class);
PublishSubscribeChannel psc = context.getBean("channel",PublishSubscribeChannel.class);
spca.setSource(frms);
spca.setOutputChannel(psc);
return spca;
}
即使我使用@InboundChannelAdapter也没有区别
@Bean(name="source")
@InboundChannelAdapter(value = "channel", poller = @Poller(fixedDelay = "1000"))
public FileReadingMessageSource getFileMessageSource(){
FileReadingMessageSource lm = new FileReadingMessageSource();
lm.setDirectory(new File("C:/fromDir/"));
lm.setFilter(new AcceptAllFileListFilter<>());
lm.setUseWatchService(true);
lm.setWatchEvents(WatchEventType.CREATE);
return lm;
}
我做错了什么？
答案 0 :(得分：2)
我在配置中看不到轮询代码，但我想知道你是否还有其他内容：
@EnableIntegration SourcePollingChannelAdapter应提供PollerMetadata @InboundChannelAdapter（请参阅Reference Manual）context.getBean()真的很奇怪。您应该使用 injection 。前者用于运行时而不是初始化阶段。修改
Spring Integration Java DSL示例：
@SpringBootApplication
public class FileChangeLineSeparator {
public static void main(String[] args) throws Exception {
ConfigurableApplicationContext context = new SpringApplicationBuilder(FileChangeLineSeparator.class)
.web(false)
.run(args);
System.out.println("Put a windows file with a .txt extension in /tmp/in,"
+ "\nthe file will be converted to Un*x and placed in"
+ "\n/tmp/out"
+ "\n\nHit enter to terminate");
System.in.read();
context.close();
}
@Bean
@InboundChannelAdapter(value = "channel", poller = @Poller(fixedDelay = "1000"))
public FileReadingMessageSource getFileMessageSource() {
FileReadingMessageSource lm = new FileReadingMessageSource();
lm.setDirectory(new File("/tmp/in"));
lm.setFilter(new AcceptAllFileListFilter<>());
lm.setUseWatchService(true);
lm.setWatchEvents(FileReadingMessageSource.WatchEventType.CREATE);
return lm;
}
@Bean
public IntegrationFlow fileToFile() {
return IntegrationFlows.from("channel")
.transform(Transformers.fileToString())
.transform("payload.replaceAll('\r\n', '\n')")
.handle(Files.outboundAdapter("'/tmp/out'")
.autoCreateDirectory(true))
.get();
}
}
我最终创建了新文件，并且可以正确选择并处理它们。
答案 1 :(得分：1)
即使@Artem Bilan的答案非常有用（这也是我接受它的原因），我发布自己的答案来展示我的最终解决方案。
每次修改文件时，我都必须监视一个目录并创建一条消息。
我使用Spring ESB FileReadingMessageSource。
此外，我必须在运行时实例化所有组件，因此我使用了Spring Integration Java DSL IntegrationFlowContext。
这是我在运行时初始化源的方式（邮件被发送到"output"频道）。
@Autowired
private IntegrationFlowContext intContext;
public void initDispatcher(String name,Long pollingFreq) throws HandlerConfigurationException {
logger.info("Source "+ name +" Inizializing");
IntegrationFlow sourceModifiedFlow = IntegrationFlows
.from(this.getFileModifiedMessageSource(), s -> s.poller(Pollers.fixedRate(pollingFreq, TimeUnit.MILLISECONDS)))
.channel("outputChannel").get();
intContext.registration(sourceModifiedFlow).id(name)).autoStartup(true).register();
}
这是我创建实际FileReader。
public FileReadingMessageSource getFileModifiedMessageSource() {
FileReadingMessageSource lm = new FileReadingMessageSource();
lm.setBeanName(String.format(SOURCE_MODIFIED_SUFFIX, name));
lm.setDirectory(new File(readingDir));
ModifiedOnlyFileScanner modifiedOnlyFileScanner = new ModifiedOnlyFileScanner(new File(readingDir));
modifiedOnlyFileScanner.setFilter(new AcceptAllFileListFilter<>());
lm.setScanner(modifiedOnlyFileScanner);
return lm;
}
默认文件扫描程序（org.springframework.integration.file.FileReadingMessageSource.WatchServiceDirectoryScanner）对我不利。主要有两个原因：
fileReadSource.setWatchEvents(WatchEventType.MODIFY);配置了阅读器，源也会在向目录创建新文件时发送消息。所以我最终编写了自己的扫描仪。这是完整的代码：
public class ModifiedOnlyFileScanner extends DefaultDirectoryScanner implements Lifecycle {
private final static Logger logger = LogManager.getLogger(FileDispatcher.class);
private final ConcurrentMap<Path, WatchKey> pathKeys = new ConcurrentHashMap<Path, WatchKey>();
private WatchService watcher;
private WatchEvent.Kind<?>[] kinds;
private File directory;
@Override
public void start() {
try {
this.watcher = FileSystems.getDefault().newWatchService();
}
catch (IOException e) {
logger.error("Failed to create watcher for " + directory, e);
}
this.kinds = new WatchEvent.Kind<?>[]{StandardWatchEventKinds.ENTRY_MODIFY};
walkDirectory(directory.toPath(), null);
}
public ModifiedOnlyFileScanner(File directory) {
super();
this.directory = directory;
}
@Override
public void stop() {
try {
this.watcher.close();
this.watcher = null;
this.pathKeys.clear();
}
catch (IOException e) {
logger.error("Failed to close watcher for " + directory, e);
}
}
@Override
public boolean isRunning() {
return true;
}
@Override
protected File[] listEligibleFiles(File directory) {
Assert.state(this.watcher != null, "The WatchService has'nt been started");
Collection<File> files = filesFromEvents();
if(files.size()>0){
logger.info("Detected Modified files "+files);
}
return files.toArray(new File[files.size()]);
}
private Set<File> filesFromEvents() {
WatchKey key = this.watcher.poll();
Set<File> files = new LinkedHashSet<File>();
while (key != null) {
File parentDir = ((Path) key.watchable()).toAbsolutePath().toFile();
for (WatchEvent<?> event : key.pollEvents()) {
if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY ) {
Path item = (Path) event.context();
File file = new File(parentDir, item.toFile().getName());
if (file.exists()) {
//I do not dig into directories
if (!file.isDirectory()) {
files.remove(file);
files.add(file);
}
}
else {
logger.warn("A file [" + file + "] for the event [" + event.kind() +
"] doesn't exist. Ignored.");
}
}
}
key.reset();
key = this.watcher.poll();
}
return files;
}
private Set<File> walkDirectory(Path directory, final WatchEvent.Kind<?> kind) {
final Set<File> walkedFiles = new LinkedHashSet<File>();
try {
registerWatch(directory);
Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
FileVisitResult fileVisitResult = super.preVisitDirectory(dir, attrs);
registerWatch(dir);
return fileVisitResult;
}
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
FileVisitResult fileVisitResult = super.visitFile(file, attrs);
if (!StandardWatchEventKinds.ENTRY_MODIFY.equals(kind)) {
walkedFiles.add(file.toFile());
}
return fileVisitResult;
}
});
}
catch (IOException e) {
logger.error("Failed to walk directory: " + directory.toString(), e);
}
return walkedFiles;
}
private void registerWatch(Path dir) throws IOException {
if (!this.pathKeys.containsKey(dir)) {
if (logger.isDebugEnabled()) {
logger.debug("registering: " + dir + " for file events");
}
WatchKey watchKey = dir.register(this.watcher, this.kinds);
this.pathKeys.putIfAbsent(dir, watchKey);
}
}
}