jstorm-core/src/main/java/backtype/storm/testing/FeederSpout.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 backtype.storm.topology.OutputFieldsDeclarer;
import java.util.Map;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.base.BaseRichSpout;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
import backtype.storm.utils.InprocMessaging;
import java.util.HashMap;
import java.util.List;
import java.util.UUID;

public class FeederSpout extends BaseRichSpout {
    private int _id;
    private Fields _outFields;
    private SpoutOutputCollector _collector;
    private AckFailDelegate _ackFailDelegate;

    public FeederSpout(Fields outFields) {
        _id = InprocMessaging.acquireNewPort();
        _outFields = outFields;
    }

    public void setAckFailDelegate(AckFailDelegate d) {
        _ackFailDelegate = d;
    }

    public void feed(List<Object> tuple) {
        feed(tuple, UUID.randomUUID().toString());
    }

    public void feed(List<Object> tuple, Object msgId) {
        InprocMessaging.sendMessage(_id, new Values(tuple, msgId));
    }

    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        _collector = collector;
    }

    public void close() {

    }

    public void nextTuple() {
        List<Object> toEmit = (List<Object>) InprocMessaging.pollMessage(_id);
        if (toEmit != null) {
            List<Object> tuple = (List<Object>) toEmit.get(0);
            Object msgId = toEmit.get(1);

            _collector.emit(tuple, msgId);
        } else {
            try {
                Thread.sleep(1);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
        }
    }

    public void ack(Object msgId) {
        if (_ackFailDelegate != null) {
            _ackFailDelegate.ack(msgId);
        }
    }

    public void fail(Object msgId) {
        if (_ackFailDelegate != null) {
            _ackFailDelegate.fail(msgId);
        }
    }

    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(_outFields);
    }

    @Override
    public Map<String, Object> getComponentConfiguration() {
        return new HashMap<String, Object>();
    }
}