需求

每隔五秒输出5次数据

pom文件

<dependencies>
        <dependency>
            <groupId>org.apache.flume</groupId>
            <artifactId>flume-ng-core</artifactId>
            <version>1.9.0</version>
        </dependency>
    </dependencies>

代码

package com.longer.source;

import org.apache.flume.Context;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.PollableSource;
import org.apache.flume.conf.Configurable;
import org.apache.flume.event.SimpleEvent;
import org.apache.flume.source.AbstractSource;

import java.nio.charset.StandardCharsets;
import java.util.HashMap;

public class MySource  extends AbstractSource implements Configurable, PollableSource {

    //定义配置文件将来要读取的字段
    private String pre;
    private String tail;
    private Long delay;
    //初始化配置信息
    @Override
    public void configure(Context context) {
        pre=context.getString("pre");
        tail=context.getString("tail","-tail");
        delay=context.getLong("delay",5000L);
    }

    @Override
    public Status process() throws EventDeliveryException {

        try {
            //创建事件头信息
            HashMap<String, String> headerMap = new HashMap<>();
            //循环封装事件
            for (int i = 0; i < 5; i++) {
                //创建事件
                SimpleEvent simpleEvent = new SimpleEvent();
                //给事件设置头信息
                simpleEvent.setHeaders(headerMap);
                //给事件设置内容
                simpleEvent.setBody((pre + i + tail).getBytes(StandardCharsets.UTF_8));
                //讲事件写入channel
                getChannelProcessor().processEvent(simpleEvent);
            }
            Thread.sleep(delay);
        }catch (Exception e){
            e.printStackTrace();
            return Status.BACKOFF;
        }
        return Status.READY;
    }

    @Override
    public long getBackOffSleepIncrement() {
        return 0;
    }

    @Override
    public long getMaxBackOffSleepInterval() {
        return 0;
    }


}

flume

# Name the components on this agent
a1.sources = r1
a1.sinks = k1
a1.channels = c1 

# Describe/configure the source
a1.sources.r1.type = com.longer.source.MySource
a1.sources.r1.pre = longer
a1.sources.r1.tail = short


# Describe the sink
a1.sinks.k1.type=logger


# Use a channel which buffers events in memory
a1.channels.c1.type = memory
a1.channels.c1.capacity = 1000
a1.channels.c1.transactionCapacity = 100


# Bind the source and sink to the channel
a1.sources.r1.channels = c1
a1.sinks.k1.channel = c1

启动

bin/flume-ng agent --conf conf/ --name a1 --conf-file job/group5/flume.conf -Dflume.root.logger=INFO,console