普通事务ITransactionalSpout实例

1、普通事务Spout

/**
 * 普通事务Spout
 */
public class MyTxSpout implements ITransactionalSpout<MyMata>{

	
	private static final long serialVersionUID = 1L;
	
	
	/**
	 * 数据源
	 */
	Map<Long, String> dbMap  = null;
	public MyTxSpout()
	{
		Random random = new Random();
		dbMap = new HashMap<Long, String> ();
		String[] hosts = { "www.taobao.com" };
		String[] session_id = { "ABYH6Y4V4SCVXTG6DPB4VH9U123", "XXYH6YCGFJYERTT834R52FDXV9U34", "BBYH61456FGHHJ7JL89RG5VV9UYU7",
				"CYYH6Y2345GHI899OFG4V9U567", "VVVYH6Y4V4SFXZ56JIPDPB4V678" };
		String[] time = { "2014-01-07 08:40:50", "2014-01-07 08:40:51", "2014-01-07 08:40:52", "2014-01-07 08:40:53", 
				"2014-01-07 09:40:49", "2014-01-07 10:40:49", "2014-01-07 11:40:49", "2014-01-07 12:40:49" };
		
		for (long i = 0; i < 100; i++) {
			dbMap.put(i,hosts[0]+"\t"+session_id[random.nextInt(5)]+"\t"+time[random.nextInt(8)]);
		}
	}
	
	

	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		declarer.declare(new Fields("tx","log"));
	}

	public Map<String, Object> getComponentConfiguration() {
		return null;
	}

	public org.apache.storm.transactional.ITransactionalSpout.Coordinator<MyMata> getCoordinator(Map conf,
			TopologyContext context) {
		/**
		 * 发射该metadata（事务tuple）到“batch emit”流
		 */
		return new MyCoordinator();
	}

	public org.apache.storm.transactional.ITransactionalSpout.Emitter<MyMata> getEmitter(Map conf,
			TopologyContext context) {
		/**
		 * 逐个发射实际batch的tuple
		 */
		return new MyEmitter(dbMap);
	}

}

2、事务Spout创建一个新的事务（元数据）metadata
  2、1元数据定义

public class MyMata implements Serializable{

	/**
	 * metadata(元数据)中包含当前事务可以从哪个point进行重放数据，存放在zookeeper中的，spout可以通过Kryo从zookeeper中序列化和反序列化该元数据。 
	 */
	private static final long serialVersionUID = 1L;
	
	private long beginPoint ;//事务开始位置

	private int num ;//batch 的tuple个数
	@Override
	public String toString() {
		return getBeginPoint()+"----"+getNum();
	}
	
	public long getBeginPoint() {
		return beginPoint;
	}

	public void setBeginPoint(long beginPoint) {
		this.beginPoint = beginPoint;
	}

	public int getNum() {
		return num;
	}

	public void setNum(int num) {
		this.num = num;
	}
	
	
}

2、2 获得（元数据）metadata，逐个发射实际batch的tuple

public class MyEmitter implements ITransactionalSpout.Emitter<MyMata> {

	Map<Long, String> dbMap = null;

	public MyEmitter(Map<Long, String> dbMap) {
		this.dbMap = dbMap;
	}

	//逐个发射实际batch的tuple
	public void emitBatch(TransactionAttempt tx, MyMata coordinatorMeta, BatchOutputCollector collector) {

		long beginPoint = coordinatorMeta.getBeginPoint();// 从上一个批次获得开始位置

		int num = coordinatorMeta.getNum();// 从批次中获取批次数量

		for (long i = beginPoint; i < num + beginPoint; i++) {
			if (dbMap.get(i) == null) {
				continue;
			}
			collector.emit(new Values(tx, dbMap.get(i)));
		}

	}

	public void cleanupBefore(BigInteger txid) {

	}

	public void close() {

	}

}

3、事务Bolt，会从Emitter接收数据处理，处理完成，提交给finishBatch方法处理。

/**
 * 事务Bolt
 */
public class MyTransactionBolt extends BaseTransactionalBolt {

	private static final long serialVersionUID = 1L;

	public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, TransactionAttempt id) {
		this.collector = collector;
		System.err.println("MyTransactionBolt prepare " + id.getTransactionId() + "  attemptid" + id.getAttemptId());
	}

	Integer count = 0;
	BatchOutputCollector collector;
	TransactionAttempt tx;

	// 会从Emitter接收数据处理，处理完成，提交给finishBatch方法处理。
	public void execute(Tuple tuple) {
		tx = (TransactionAttempt) tuple.getValue(0);
		System.err.println(
				"MyTransactionBolt TransactionAttempt " + tx.getTransactionId() + "  attemptid" + tx.getAttemptId());
		String log = tuple.getString(1);
		if (log != null && log.length() > 0) {
			count++;
		}
	}

	// 批处理提交
	public void finishBatch() {
		System.err.println("finishBatch " + count);
		collector.emit(new Values(tx, count));
	}

	public void declareOutputFields(OutputFieldsDeclarer declarer) {
		
		declarer.declare(new Fields("tx", "count"));

	}

}

4、Icommitter，batch之间强制按照顺序进行提交

public class MyCommitter extends BaseTransactionalBolt implements ICommitter {

	/**
	 * 接口Icommitter：标识IBatchBolt 或BaseTransactionalBolt是否是一个committer
	 */
	private static final long serialVersionUID = 1L;
	public static final String GLOBAL_KEY = "GLOBAL_KEY";
	public static Map<String, DbValue> dbMap = new HashMap<String, DbValue>();
	int sum = 0;
	TransactionAttempt id;
	BatchOutputCollector collector;

	public void execute(Tuple tuple) {
		sum += tuple.getInteger(1);
	}

	public void finishBatch() {

		DbValue value = dbMap.get(GLOBAL_KEY);
		DbValue newValue;
		if (value == null || !value.txid.equals(id.getTransactionId())) {
			// 更新数据库
			newValue = new DbValue();
			newValue.txid = id.getTransactionId();
			if (value == null) {
				newValue.count = sum;
			} else {
				newValue.count = value.count + sum;
			}
			dbMap.put(GLOBAL_KEY, newValue);
		} else {
			newValue = value;
		}
		System.err.println("total==========================:" + dbMap.get(GLOBAL_KEY).count);
		// collector.emit(tuple)
	}

	public void prepare(Map conf, TopologyContext context, BatchOutputCollector collector, TransactionAttempt id) {
		this.id = id;
		this.collector = collector;
	}

	public void declareOutputFields(OutputFieldsDeclarer declarer) {

	}

	public static class DbValue {
		BigInteger txid;
		int count = 0;
	}

}

5、topo类

public class MyTopo {

	/**
	 * 事务topo
	 */
	public static void main(String[] args) {

		TransactionalTopologyBuilder builder = new TransactionalTopologyBuilder("ttbId", "spoutid", new MyTxSpout(), 1);
		builder.setBolt("bolt1", new MyTransactionBolt(), 3).shuffleGrouping("spoutid");
		builder.setBolt("committer", new MyCommitter(), 1).shuffleGrouping("bolt1");

		Config conf = new Config();
		conf.setDebug(true);

		if (args.length > 0) {
			try {
				StormSubmitter.submitTopology(args[0], conf, builder.buildTopology());
			} catch (AlreadyAliveException e) {
				e.printStackTrace();
			} catch (InvalidTopologyException e) {
				e.printStackTrace();
			} catch (AuthorizationException e) {
				e.printStackTrace();
			}
		} else {
			LocalCluster localCluster = new LocalCluster();
			localCluster.submitTopology("mytopology", conf, builder.buildTopology());
		}

	}

}

6、测试结果

引用

启动一个事务：0----10
MyTransactionBolt prepare 1  attemptid3005464965348344518
MyTransactionBolt prepare 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt prepare 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
finishBatch 3
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
MyTransactionBolt TransactionAttempt 1  attemptid3005464965348344518
finishBatch 4
finishBatch 3
total==========================:10
启动一个事务：10----10
MyTransactionBolt prepare 2  attemptid4420908201582652570
MyTransactionBolt prepare 2  attemptid4420908201582652570
MyTransactionBolt prepare 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
finishBatch 3
MyTransactionBolt TransactionAttempt 2  attemptid4420908201582652570
finishBatch 4
finishBatch 3
total==========================:20