/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package storm.trident.spout;
import backtype.storm.task.TopologyContext;
import backtype.storm.tuple.Fields;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import storm.trident.operation.TridentCollector;
import storm.trident.topology.TransactionAttempt;
import storm.trident.topology.state.RotatingTransactionalState;
import storm.trident.topology.state.TransactionalState;
public class PartitionedTridentSpoutExecutor implements ITridentSpout<Integer> {
IPartitionedTridentSpout _spout;
public PartitionedTridentSpoutExecutor(IPartitionedTridentSpout spout) {
_spout = spout;
}
public IPartitionedTridentSpout getPartitionedSpout() {
return _spout;
}
class Coordinator implements ITridentSpout.BatchCoordinator<Object> {
private IPartitionedTridentSpout.Coordinator _coordinator;
public Coordinator(Map conf, TopologyContext context) {
_coordinator = _spout.getCoordinator(conf, context);
}
@Override
public Object initializeTransaction(long txid, Object prevMetadata, Object currMetadata) {
if(currMetadata!=null) {
return currMetadata;
} else {
return _coordinator.getPartitionsForBatch();
}
}
@Override
public void close() {
_coordinator.close();
}
@Override
public void success(long txid) {
}
@Override
public boolean isReady(long txid) {
return _coordinator.isReady(txid);
}
}
static class EmitterPartitionState {
public RotatingTransactionalState rotatingState;
public ISpoutPartition partition;
public EmitterPartitionState(RotatingTransactionalState s, ISpoutPartition p) {
rotatingState = s;
partition = p;
}
}
class Emitter implements ITridentSpout.Emitter<Object> {
private IPartitionedTridentSpout.Emitter _emitter;
private TransactionalState _state;
private Map<String, EmitterPartitionState> _partitionStates = new HashMap<String, EmitterPartitionState>();
private int _index;
private int _numTasks;
public Emitter(String txStateId, Map conf, TopologyContext context) {
_emitter = _spout.getEmitter(conf, context);
_state = TransactionalState.newUserState(conf, txStateId);
_index = context.getThisTaskIndex();
_numTasks = context.getComponentTasks(context.getThisComponentId()).size();
}
Object _savedCoordinatorMeta = null;
@Override
public void emitBatch(final TransactionAttempt tx, final Object coordinatorMeta,
final TridentCollector collector) {
if(_savedCoordinatorMeta == null || !_savedCoordinatorMeta.equals(coordinatorMeta)) {
List<ISpoutPartition> partitions = _emitter.getOrderedPartitions(coordinatorMeta);
_partitionStates.clear();
List<ISpoutPartition> myPartitions = new ArrayList();
for(int i=_index; i < partitions.size(); i+=_numTasks) {
ISpoutPartition p = partitions.get(i);
String id = p.getId();
myPartitions.add(p);
_partitionStates.put(id, new EmitterPartitionState(new RotatingTransactionalState(_state, id), p));
}
_emitter.refreshPartitions(myPartitions);
_savedCoordinatorMeta = coordinatorMeta;
}
for(EmitterPartitionState s: _partitionStates.values()) {
RotatingTransactionalState state = s.rotatingState;
final ISpoutPartition partition = s.partition;
Object meta = state.getStateOrCreate(tx.getTransactionId(),
new RotatingTransactionalState.StateInitializer() {
@Override
public Object init(long txid, Object lastState) {
return _emitter.emitPartitionBatchNew(tx, collector, partition, lastState);
}
});
// it's null if one of:
// a) a later transaction batch was emitted before this, so we should skip this batch
// b) if didn't exist and was created (in which case the StateInitializer was invoked and
// it was emitted
if(meta!=null) {
_emitter.emitPartitionBatch(tx, collector, partition, meta);
}
}
}
@Override
public void success(TransactionAttempt tx) {
for(EmitterPartitionState state: _partitionStates.values()) {
state.rotatingState.cleanupBefore(tx.getTransactionId());
}
}
@Override
public void close() {
_state.close();
_emitter.close();
}
}
@Override
public ITridentSpout.BatchCoordinator getCoordinator(String txStateId, Map conf, TopologyContext context) {
return new Coordinator(conf, context);
}
@Override
public ITridentSpout.Emitter getEmitter(String txStateId, Map conf, TopologyContext context) {
return new Emitter(txStateId, conf, context);
}
@Override
public Map<String, Object> getComponentConfiguration() {
return _spout.getComponentConfiguration();
}
@Override
public Fields getOutputFields() {
return _spout.getOutputFields();
}
}