/**
* 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.drpc;
import backtype.storm.Config;
import backtype.storm.drpc.DRPCInvocationsClient;
import backtype.storm.generated.DistributedRPCInvocations;
import backtype.storm.utils.ServiceRegistry;
import backtype.storm.utils.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.thrift7.TException;
import org.json.simple.JSONValue;
import storm.trident.drpc.ReturnResultsReducer.ReturnResultsState;
import storm.trident.operation.MultiReducer;
import storm.trident.operation.TridentCollector;
import storm.trident.operation.TridentMultiReducerContext;
import storm.trident.tuple.TridentTuple;
public class ReturnResultsReducer implements MultiReducer<ReturnResultsState> {
public static class ReturnResultsState {
List<TridentTuple> results = new ArrayList<TridentTuple>();
String returnInfo;
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this);
}
}
boolean local;
Map<List, DRPCInvocationsClient> _clients = new HashMap<List, DRPCInvocationsClient>();
@Override
public void prepare(Map conf, TridentMultiReducerContext context) {
local = conf.get(Config.STORM_CLUSTER_MODE).equals("local");
}
@Override
public ReturnResultsState init(TridentCollector collector) {
return new ReturnResultsState();
}
@Override
public void execute(ReturnResultsState state, int streamIndex, TridentTuple input, TridentCollector collector) {
if(streamIndex==0) {
state.returnInfo = input.getString(0);
} else {
state.results.add(input);
}
}
@Override
public void complete(ReturnResultsState state, TridentCollector collector) {
// only one of the multireducers will receive the tuples
if(state.returnInfo!=null) {
String result = JSONValue.toJSONString(state.results);
Map retMap = (Map) JSONValue.parse(state.returnInfo);
final String host = (String) retMap.get("host");
final int port = Utils.getInt(retMap.get("port"));
String id = (String) retMap.get("id");
DistributedRPCInvocations.Iface client;
if(local) {
client = (DistributedRPCInvocations.Iface) ServiceRegistry.getService(host);
} else {
List server = new ArrayList() {{
add(host);
add(port);
}};
if(!_clients.containsKey(server)) {
_clients.put(server, new DRPCInvocationsClient(host, port));
}
client = _clients.get(server);
}
try {
client.result(id, result);
} catch(TException e) {
collector.reportError(e);
}
}
}
@Override
public void cleanup() {
for(DRPCInvocationsClient c: _clients.values()) {
c.close();
}
}
}