问题
For File reading message source Inbound Adapter and transformer with annotations is configured as below
@Bean
@InboundChannelAdapter(autoStartup = "false", value = "incomingchannel", poller = @Poller("custompoller"))
public MessageSource<File> fileReadingMessageSource() {
}
@Transformer(inputChannel = "incomingchannel", outputChannel = "jobLaunchChannel")
public JobLaunchRequest toRequest(Message<File> message) throws Exception {
}
Now I want to change the Transformer to refer to a reply channel of outbound gateway i.e. which moves the files from one directory to another directory i.e. move the file from incomingchannel directory to a different directory and the process or transform he file or perform some validations
<file:outbound-gateway id="mover" request-channel="incomingchannel" reply-channel="newdirectory" directory="<<path to new directory file to be moved" delete-source-files="true"/>
Anyone has converted above XML configuration to annotation configurations or any ideas?
After annotation configurations I will have to change the transformer input channel to refer to newdirectory channel i.e. which is a reply channel of messaging gateway...
Thanks in advance for any help ot suggestions regarding this
--- Update 1 after trying out the snippet provided in link by Artem
@Bean
@ServiceActivator(inputChannel = "incomingchannel")
public MessageHandler fileWritingMessageHandler() {
FileWritingMessageHandler handler = new FileWritingMessageHandler(new File(newdirectorypath));
handler.setFileExistsMode(FileExistsMode.APPEND);
handler.setDeleteSourceFiles(true);
return handler;
}
@MessagingGateway(defaultRequestChannel = "incomingchannel", defaultReplyChannel = "newdirectorychannel")
public interface MyGateway {
void writeToFile(@Header(FileHeaders.FILENAME) String fileName, @Header(FileHeaders.FILENAME) File directory,
String data);
}
But there are two problems encountered
Inbound Adapter is trying to poll the directory also as file (Recursive Directory scanner is used) - How to ensure that directory is not polled as a file
nested exception is
org.springframework.messaging.core.DestinationResolutionException: no output-channel or replyChannel header available, failedMessage=GenericMessage [payload=C
回答1:
Ok. Since it looks like you would like to place the FileWritingMessageHandler
after @InboundChannelAdapter
and before @Transformer
, so this should like:
@Bean
@InboundChannelAdapter(autoStartup = "false", value = "incomingchannel", poller = @Poller("custompoller"))
public MessageSource<File> fileReadingMessageSource() {
}
@Bean
@ServiceActivator(inputChannel = "incomingchannel")
public MessageHandler fileWritingMessageHandler() {
FileWritingMessageHandler handler = new FileWritingMessageHandler(new File(newdirectorypath));
handler.setFileExistsMode(FileExistsMode.APPEND);
handler.setDeleteSourceFiles(true);
handler.setOutputChannelName("jobLaunchTransfromerCannel");
return handler;
}
@Transformer(inputChannel = "jobLaunchTransfromerCannel", outputChannel = "jobLaunchChannel")
public JobLaunchRequest toRequest(Message<File> message) throws Exception {
}
This way an @InboundChannelAdapter
sends a File into a FileWritingMessageHandler
for its logic, which produces a result file for the next in flow @Transformer
to convert a result file into a JobLaunchRequest
. And only after that a message is going to be sent to the jobLaunchChannel
to file a Spring Batch Job
.
来源:https://stackoverflow.com/questions/61372879/spring-integration-file-reading-message-source-inbound-channel-adapter-out