Apache Camel：带计划程序的FTP文件（目录为空时关闭连接）

Question

I would like to use Apache Camel for sending files from a local directory to a FTP location. We only get 1 or 2 times a day files in that local directory. So it isn't necessary to have that connection open the whole day. What I would like to achieve is that we will open the connection when there are files in the directory (this is something we could do by checking the dir), but how could we check if sending the files with Apache Camel is done and close the connection?

Is there some feedback from the RouteBuilder or what is the best way to achieve this?

Thanks

Answer 1

You can use the disconnect=true option to close the connection after sending is complete.

See the documentation at: http://camel.apache.org/ftp2

Answer 2

I solved the issue by using the FTPToClientRouteBuilder which is called in the following method:

@Override
public void sentFilesViaFTPToClient() {

    CamelContext context = new DefaultCamelContext();

    try {
        context.addRoutes(new FTPToClientRouteBuilder());
        context.start();

        while (true) {
            if (CollectionUtils.isEmpty(context.getRoutes())) {
                LOG.info("Finished sending files via FTP.");
                context.stop();
                break;
            }
        }
    } catch (Exception e) {
        throw new RuntimeException("Couldn't FTP files", e);
    } finally {
        try {
            context.stop();
        } catch (Exception e) {
            //ignore exception
        }
    }
}

FTPToClientRouteBuilder

public class FTPToClientRouteBuilder extends RouteBuilder {

private static final Logger LOG = LoggerFactory.getLogger(FTPToClientRouteBuilder.class);

private String ftpLocation;
private String uploadLocation = "file:" + location + "?delete=true&moveFailed=../error&sendEmptyMessageWhenIdle=true";

@Override
public void configure() throws Exception {

    // set graceful shutdown timeout
    getContext().getShutdownStrategy().setTimeout(10);

    from(uploadLocation)
        .choice()
            .when(body().isNotNull())
            .log("Uploading file ${file:name}")
            .to(ftpLocation)
            .log("Uploaded file ${file:name} complete.")
        .otherwise()
        .process(new ShutdownProcessor());
}

private class ShutdownProcessor implements Processor {

    @Override
    public void process(Exchange exchange) throws Exception {
        new Thread() {
            @Override
            public void run() {
                try {
                    exchange.getContext().stop();
                } catch (Exception e) {
                    LOG.error("Couldn't stop the route", e);
                }
            }
        }.start();
    }
}
}