/*
* 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 org.apache.flink.storm.util;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.IRichSpout;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.tuple.Fields;
import java.util.Map;
/**
* Base class for Spouts that read data line by line from an arbitrary source. The declared output schema has a single
* attribute called {@code line} and should be of type {@link String}.
*/
public abstract class AbstractLineSpout implements IRichSpout {
private static final long serialVersionUID = 8876828403487806771L;
public final static String ATTRIBUTE_LINE = "line";
protected SpoutOutputCollector collector;
@SuppressWarnings("rawtypes")
@Override
public void open(final Map conf, final TopologyContext context, final SpoutOutputCollector collector) {
this.collector = collector;
}
@Override
public void close() {/* noting to do */}
@Override
public void activate() {/* noting to do */}
@Override
public void deactivate() {/* noting to do */}
@Override
public void ack(final Object msgId) {/* noting to do */}
@Override
public void fail(final Object msgId) {/* noting to do */}
@Override
public void declareOutputFields(final OutputFieldsDeclarer declarer) {
declarer.declare(new Fields(ATTRIBUTE_LINE));
}
@Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
}