package backtype.storm.testing;
import backtype.storm.Config;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.transactional.TransactionAttempt;
import backtype.storm.coordination.BatchOutputCollector;
import backtype.storm.transactional.partitioned.IPartitionedTransactionalSpout;
import backtype.storm.transactional.partitioned.IPartitionedTransactionalSpout.Emitter;
import backtype.storm.tuple.Fields;
import backtype.storm.utils.RegisteredGlobalState;
import backtype.storm.utils.Utils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This spout only works in local mode.
*/
public class MemoryTransactionalSpout implements IPartitionedTransactionalSpout<MemoryTransactionalSpoutMeta> {
public static String TX_FIELD = MemoryTransactionalSpout.class.getName() + "/id";
private String _id;
private String _finishedPartitionsId;
private int _takeAmt;
private Fields _outFields;
public MemoryTransactionalSpout(Map<Integer, List<List<Object>>> partitions, Fields outFields, int takeAmt) {
_id = RegisteredGlobalState.registerState(partitions);
Map<Integer, Boolean> finished = Collections.synchronizedMap(new HashMap<Integer, Boolean>());
_finishedPartitionsId = RegisteredGlobalState.registerState(finished);
_takeAmt = takeAmt;
_outFields = outFields;
}
public boolean isExhaustedTuples() {
Map<Integer, Boolean> statuses = getFinishedStatuses();
for(Integer partition: getQueues().keySet()) {
if(!statuses.containsKey(partition) || !getFinishedStatuses().get(partition)) {
return false;
}
}
return true;
}
class Coordinator implements IPartitionedTransactionalSpout.Coordinator {
@Override
public int numPartitions() {
return getQueues().size();
}
@Override
public void close() {
}
}
class Emitter implements IPartitionedTransactionalSpout.Emitter<MemoryTransactionalSpoutMeta> {
Integer _maxSpoutPending;
Map<Integer, Integer> _emptyPartitions = new HashMap<Integer, Integer>();
public Emitter(Map conf) {
Object c = conf.get(Config.TOPOLOGY_MAX_SPOUT_PENDING);
if(c==null) _maxSpoutPending = 1;
else _maxSpoutPending = Utils.getInt(c);
}
@Override
public MemoryTransactionalSpoutMeta emitPartitionBatchNew(TransactionAttempt tx, BatchOutputCollector collector, int partition, MemoryTransactionalSpoutMeta lastPartitionMeta) {
int index;
if(lastPartitionMeta==null) {
index = 0;
} else {
index = lastPartitionMeta.index + lastPartitionMeta.amt;
}
List<List<Object>> queue = getQueues().get(partition);
int total = queue.size();
int left = total - index;
int toTake = Math.min(left, _takeAmt);
MemoryTransactionalSpoutMeta ret = new MemoryTransactionalSpoutMeta(index, toTake);
emitPartitionBatch(tx, collector, partition, ret);
if(toTake==0) {
// this is a pretty hacky way to determine when all the partitions have been committed
// wait until we've emitted max-spout-pending empty partitions for the partition
int curr = Utils.get(_emptyPartitions, partition, 0) + 1;
_emptyPartitions.put(partition, curr);
if(curr > _maxSpoutPending) {
getFinishedStatuses().put(partition, true);
}
}
return ret;
}
@Override
public void emitPartitionBatch(TransactionAttempt tx, BatchOutputCollector collector, int partition, MemoryTransactionalSpoutMeta partitionMeta) {
List<List<Object>> queue = getQueues().get(partition);
for(int i=partitionMeta.index; i < partitionMeta.index + partitionMeta.amt; i++) {
List<Object> toEmit = new ArrayList<Object>(queue.get(i));
toEmit.add(0, tx);
collector.emit(toEmit);
}
}
@Override
public void close() {
}
}
@Override
public IPartitionedTransactionalSpout.Coordinator getCoordinator(Map conf, TopologyContext context) {
return new Coordinator();
}
@Override
public IPartitionedTransactionalSpout.Emitter<MemoryTransactionalSpoutMeta> getEmitter(Map conf, TopologyContext context) {
return new Emitter(conf);
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
List<String> toDeclare = new ArrayList<String>(_outFields.toList());
toDeclare.add(0, TX_FIELD);
declarer.declare(new Fields(toDeclare));
}
@Override
public Map<String, Object> getComponentConfiguration() {
Config conf = new Config();
conf.registerSerialization(MemoryTransactionalSpoutMeta.class);
return conf;
}
public void startup() {
getFinishedStatuses().clear();
}
public void cleanup() {
RegisteredGlobalState.clearState(_id);
RegisteredGlobalState.clearState(_finishedPartitionsId);
}
private Map<Integer, List<List<Object>>> getQueues() {
return (Map<Integer, List<List<Object>>>) RegisteredGlobalState.getState(_id);
}
private Map<Integer, Boolean> getFinishedStatuses() {
return (Map<Integer, Boolean>) RegisteredGlobalState.getState(_finishedPartitionsId);
}
}