jstorm-core/src/main/java/backtype/storm/testing/PythonShellMetricsSpout.java

/*
 * 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 backtype.storm.testing;

import java.util.Map;

import backtype.storm.metric.api.rpc.CountShellMetric;
import backtype.storm.spout.ShellSpout;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;

public class PythonShellMetricsSpout extends ShellSpout implements IRichSpout {
    private static final long serialVersionUID = 1999209252187463355L;

    public PythonShellMetricsSpout(String[] command) {
        super(command);
    }

    @Override
    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        super.open(conf, context, collector);

        CountShellMetric cMetric = new CountShellMetric();
        context.registerMetric("my-custom-shellspout-metric", cMetric, 5);
    }

    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("field1"));
    }

    public Map<String, Object> getComponentConfiguration() {
        return null;
    }
}