/*
* Copyright 2012 Nodeable Inc
*
* Licensed 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 com.streamreduce.storm.spouts;
import com.mongodb.BasicDBObject;
import com.streamreduce.storm.MongoClient;
import java.util.ArrayList;
import java.util.List;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import org.apache.log4j.Logger;
/**
* Extension of {@link AbstractScheduledDBCollectionSpout} that will
* emit the {@link BasicDBObject} representation for each Nodeable
*/
public class ConnectionSpout extends AbstractScheduledDBCollectionSpout {
private static final long serialVersionUID = 2126467278030837837L;
private static MongoClient mongoClient = new MongoClient(MongoClient.BUSINESSDB_CONFIG_ID);
private static Logger logger = Logger.getLogger(EventSpout.class);
/**
* Constructor. (Calls super constructor with a sleep duration of 120s for now.)
*/
public ConnectionSpout() {
super(120000);
}
/**
* {@inheritDoc}
*/
public ConnectionSpout(int sleepDuration) {
super(sleepDuration);
}
/**
* {@inheritDoc}
*/
@Override
public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
outputFieldsDeclarer.declare(new Fields("connection"));
}
/**
* {@inheritDoc}
*/
@Override
public void handleDBEntry(SpoutOutputCollector collector, BasicDBObject entry) {
collector.emit(new Values(entry));
ack(entry);
}
/**
* {@inheritDoc}
*/
@Override
public List<BasicDBObject> getDBEntries() {
try {
return mongoClient.getConnections();
} catch (Exception e) {
logger.error("0 connections emmitted due to failure in getDBEntries", e);
return new ArrayList<>();
}
}
/**
* {@inheritDoc}
*/
@Override
public BasicDBObject getDBEntry(String id) {
try {
return mongoClient.getConnection(id);
} catch (Exception e) {
logger.error("Unable to retrieve DBEntry due to unexpected failure",e);
return null;
}
}
}