package backtype.storm.transactional.partitioned;
import backtype.storm.Config;
import backtype.storm.coordination.BatchOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.transactional.ICommitterTransactionalSpout;
import backtype.storm.transactional.ITransactionalSpout;
import backtype.storm.transactional.TransactionAttempt;
import backtype.storm.transactional.state.RotatingTransactionalState;
import backtype.storm.transactional.state.TransactionalState;
import java.math.BigInteger;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;
public class OpaquePartitionedTransactionalSpoutExecutor implements
ICommitterTransactionalSpout<Object> {
IOpaquePartitionedTransactionalSpout _spout;
public class Coordinator implements ITransactionalSpout.Coordinator<Object> {
IOpaquePartitionedTransactionalSpout.Coordinator _coordinator;
public Coordinator(Map conf, TopologyContext context) {
_coordinator = _spout.getCoordinator(conf, context);
}
@Override
public Object initializeTransaction(BigInteger txid, Object prevMetadata) {
return null;
}
@Override
public boolean isReady() {
return _coordinator.isReady();
}
@Override
public void close() {
_coordinator.close();
}
}
public class Emitter implements ICommitterTransactionalSpout.Emitter {
IOpaquePartitionedTransactionalSpout.Emitter _emitter;
TransactionalState _state;
TreeMap<BigInteger, Map<Integer, Object>> _cachedMetas = new TreeMap<BigInteger, Map<Integer, Object>>();
Map<Integer, RotatingTransactionalState> _partitionStates = new HashMap<Integer, RotatingTransactionalState>();
int _index;
int _numTasks;
public Emitter(Map conf, TopologyContext context) {
_emitter = _spout.getEmitter(conf, context);
_index = context.getThisTaskIndex();
_numTasks = context.getComponentTasks(context.getThisComponentId())
.size();
_state = TransactionalState.newUserState(conf,
(String) conf.get(Config.TOPOLOGY_TRANSACTIONAL_ID),
getComponentConfiguration());
List<String> existingPartitions = _state.list("");
for (String p : existingPartitions) {
int partition = Integer.parseInt(p);
if ((partition - _index) % _numTasks == 0) {
_partitionStates.put(partition,
new RotatingTransactionalState(_state, p));
}
}
}
@Override
public void emitBatch(TransactionAttempt tx, Object coordinatorMeta,
BatchOutputCollector collector) {
Map<Integer, Object> metas = new HashMap<Integer, Object>();
_cachedMetas.put(tx.getTransactionId(), metas);
int partitions = _emitter.numPartitions();
Entry<BigInteger, Map<Integer, Object>> entry = _cachedMetas
.lowerEntry(tx.getTransactionId());
Map<Integer, Object> prevCached;
if (entry != null) {
prevCached = entry.getValue();
} else {
prevCached = new HashMap<Integer, Object>();
}
for (int i = _index; i < partitions; i += _numTasks) {
RotatingTransactionalState state = _partitionStates.get(i);
if (state == null) {
state = new RotatingTransactionalState(_state, "" + i);
_partitionStates.put(i, state);
}
state.removeState(tx.getTransactionId());
Object lastMeta = prevCached.get(i);
if (lastMeta == null)
lastMeta = state.getLastState();
Object meta = _emitter.emitPartitionBatch(tx, collector, i,
lastMeta);
metas.put(i, meta);
}
}
@Override
public void cleanupBefore(BigInteger txid) {
for (RotatingTransactionalState state : _partitionStates.values()) {
state.cleanupBefore(txid);
}
}
@Override
public void commit(TransactionAttempt attempt) {
BigInteger txid = attempt.getTransactionId();
Map<Integer, Object> metas = _cachedMetas.remove(txid);
for (Integer partition : metas.keySet()) {
Object meta = metas.get(partition);
_partitionStates.get(partition).overrideState(txid, meta);
}
}
@Override
public void close() {
_emitter.close();
}
}
public OpaquePartitionedTransactionalSpoutExecutor(
IOpaquePartitionedTransactionalSpout spout) {
_spout = spout;
}
@Override
public ITransactionalSpout.Coordinator<Object> getCoordinator(Map conf,
TopologyContext context) {
return new Coordinator(conf, context);
}
@Override
public ICommitterTransactionalSpout.Emitter getEmitter(Map conf,
TopologyContext context) {
return new Emitter(conf, context);
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
_spout.declareOutputFields(declarer);
}
@Override
public Map<String, Object> getComponentConfiguration() {
return _spout.getComponentConfiguration();
}
}