Hadoop实战-Flume之自定义Sink(十九)

Posted 2020-09-18

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.flume.Channel;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.Transaction;
import org.apache.flume.conf.Configurable;
import org.apache.flume.sink.AbstractSink;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MySinks extends AbstractSink implements Configurable {

    private static final Logger logger = LoggerFactory.getLogger(MySinks.class);

    private static final String PROP_KEY_ROOTPATH = "fileName";

    private String fileName;

    @Override
    public Status process() throws EventDeliveryException {
        // TODO Auto-generated method stub

        Channel ch = getChannel();
        Transaction txn = ch.getTransaction();
        Event event = null;
        txn.begin();
        while (true) {
            event = ch.take();
            if (event != null) {
                break;
            }
        }
        try {
            logger.debug("Get event.");
            String body = new String(event.getBody());
            System.out.println("event.getBody()-----" + body);
            String res = body + ":" + System.currentTimeMillis() + "\r\n";
            File file = new File(fileName);
            FileOutputStream fos = null;
            try {
                fos = new FileOutputStream(file, true);
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            try {
                fos.write(res.getBytes());
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            try {
                fos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            txn.commit();
            return Status.READY;

        } catch (Throwable th) {
            txn.rollback();
            if (th instanceof Error) {
                throw (Error) th;
            } else {
                throw new EventDeliveryException(th);
            }
        } finally {
            txn.close();
        }
    }

    @Override
    public void configure(Context context) {
        // TODO Auto-generated method stub
        fileName = context.getString(PROP_KEY_ROOTPATH);
    }

}