I'm new to spring integration. I need to fetch some file via sftp and immediately start some processing on the content of that file. There is SFTP Inbound Channel Adapter that partially satisfy me. But it saves(as documentation says) fetched file in local directory. I have no possibility to save it on local machine, but just want to start processing the content of that file, so it will be good for me to retrieve remote file as byte array or as InputStream. How can I achieve this with spring integration?
Also I want to configure my system to periodically fetch that file. I know that I can configure spring bean with #Scheduled annotation on some method and start processing from that method. But, maybe, spring integration has more elegant solution for such case?
Spring Integration 3.0.1 has a new RemoteFileTemplate that you can use to programmatically receive a file as a stream. See the Javadocs.
Related
I have an requirement to use sprint batch in order to bulk upload excel data. user would be importing this file from an UI and service is expected to use this file and import into database. I am new to spring batch and with some analysis was able to infer that we will not be able to send excel file as parameter . Is saving the file to local is only way to read this file ? Is there anyway i can read the incoming file directly using spring batch ?
If I understand your question correctly you want a user to invoke a Spring service endpoint with a file and then Spring batch job should pick that file up as an input and start job processing.
Yes, this is very much doable and you do not need to explicitly save it to your local yourself.
Here is what I would do:
Take the file as an input to a POST endpoint using Spring "org.springframework.web.multipart.MultipartFile" object. Let's call this object "file".
Then get the input stream from MultipartFile object using "file.getInputStream()".
Set this input stream as "resource" to "FlatFileItemReader" object of Spring Batch.
Sample code:
flatFileItemReader.setResource(new
InputStreamResource(file.getInputStream()));
Once this is done and you start the Spring batch job, this file will be processed in your job.
Is it possible to:
Create a jar which has AOP annotation(custom) for intercepting rabbitmq listener to write the message to DB.
Pass this jar around as dependency to other spring based applications to get their messages in the DB.
Need clarifications:
1. How do we read the method argument, message here?
2. Can pointcut be read from properties so that any application using it provides its own pointcut by adding a property in like application.properties
3. Is there any special consideration about when the jar will be loaded so that the functionality is available as soon as the application starts?
I am new to Spring batch integration. I need to move a file from one local directory to another. I tried using inbound channel and out bound channel. I'm not able to move it.
<file:inbound-channel-adapter channel="incomingfiles"
directory="file:${java.io.tmpdir}/spring-integration-samples/input"
filename-pattern="*.txt">
<file:outbound-channel-adapter channel="outgoingfiles"
directory="file:${java.io.tmpdir}/spring-integration-samples/output">
I am using correct spring namespace handler but i get unable to load namespacehandler[file]. I have added spring integration jars too. Not a mavenproject.
Kindly help me. or Can we move a file using batch instead of spring integration? IF yes, could you tell me how to do it?
I am new to Spring Integration and I am considering using it in order to poll a directory for new files in order to process those files.
My question is: is Spring Integration some sort of daemon one can launch and that one can use in order to poll a directory?
Is this is possible can someone please direct me to relevant section of the official documentation on how to launch Spring Integration?
All you need is to have a main method (or a WAR file if you want to deploy to Tomcat or another servlet container) that creates a Spring ApplicationContext (e.g. new ClassPathXmlApplicationContext("file-poller.xml"))
It can run with a cron trigger, fixed-rate or fixed-delay trigger.
JMX operations can be exposed on Spring Integration's File adapter (or any adapter) by simply adding a single config element (e.g. <mbean-export>).
Bottom line: you REALLY do not need an ESB if you simply want a File poller to run continuously. You can have a single small config file and one line of code in a main method.
Visit the samples for more info: https://github.com/springsource/spring-integration-samples (look under basic/file specifically)
Hope that helps,
Mark
Spring Integration is a part of framework, its not a programm or daemon.
What you cant do — is to configure Spring Integration to poll a directory, lunch JVM with Spring onboard and poller will do what you want.
You can start with this blog post.
More samples
Relevant section of documentation
I'm using Spring 2.5.6. I have a bean whose properties are being assign from a property file via a PropertyPlaceholderConfigurer. I'm wondering whether its possible to have the property of the bean updated when the property file is modified. There would be for example some periodic process which checks the last modified date of the property file, and if it has changed, reload the bean.
I'm wondering if there is already something that satisfies my requirements. If not, what would be the best approach to solving this problem?
Thanks for your help.
Might also look into useing Spring's PropertyOverrideConfigurer. Could re-read the properties and re-apply it in some polling/schedular bean.
It does depend on how the actual configured beans use these properties. They might, for example, indirectly cache them somewhere themself.
If you want dynamic properties at runtime, perhaps another way to do it is JMX.
One way to do this is to embed a groovy console in your application. Here's some instructions. They were very simple to do, btw - took me very little time even though I'm not that familiar with groovy.
Once you do that you can simply go into the console and change values inside the live application on the fly.
You might try to use a custom scope for the bean that recreates beans on changes of the properties file. See my more extensive answer here.
Spring Cloud Config has facilities to change configuration properties at runtime via the Spring Cloud Bus and using a Cloud Config Server. The configuration or .properties or .yml files are "externalized" from the Spring app and instead retrieved from a Spring Cloud Config Server that the app connects to on startup. That Cloud Config Server retrieves the appropriate configuration .properties or .yml files from a GIT repo (there are other storage solutions, but GIT is the most common). You can then change configuration at runtime by changing the contents of the GIT repo's configuration files--The Cloud Config Server broadcasts the changes to any Client Spring applications via the Spring Cloud Bus, and those applications' configuration is updated without needing a restart of the app. You can find a working simple example here: https://github.com/ldojo/spring-cloud-config-examples