org.apache.metron.writer.NoopWriter.java Source code

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Here is the source code for org.apache.metron.writer.NoopWriter.java

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/**
 * 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.metron.writer;

import org.apache.storm.tuple.Tuple;
import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import org.apache.metron.common.configuration.writer.WriterConfiguration;
import org.apache.metron.common.writer.BulkMessageWriter;
import org.apache.metron.common.utils.ConversionUtils;
import org.apache.metron.common.writer.BulkWriterResponse;
import org.json.simple.JSONObject;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Function;

public class NoopWriter extends AbstractWriter implements BulkMessageWriter<JSONObject> {

    public static class RandomLatency implements Function<Void, Void> {
        private int min;
        private int max;

        public RandomLatency(int min, int max) {
            this.min = min;
            this.max = max;
        }

        public int getMin() {
            return min;
        }

        public int getMax() {
            return max;
        }

        @Override
        public Void apply(Void aVoid) {
            int sleepMs = ThreadLocalRandom.current().nextInt(min, max + 1);
            try {
                Thread.sleep(sleepMs);
            } catch (InterruptedException e) {
            }
            return null;
        }
    }

    public static class FixedLatency implements Function<Void, Void> {
        private int latency;

        public FixedLatency(int latency) {
            this.latency = latency;
        }

        public int getLatency() {
            return latency;
        }

        @Override
        public Void apply(Void aVoid) {
            if (latency > 0) {
                try {
                    Thread.sleep(latency);
                } catch (InterruptedException e) {
                }
            }
            return null;
        }
    }

    Function<Void, Void> sleepFunction = null;

    public NoopWriter withLatency(String sleepConfig) {
        sleepFunction = getSleepFunction(sleepConfig);
        return this;
    }

    private Function<Void, Void> getSleepFunction(String sleepConfig) {
        String usageMessage = "Unexpected: " + sleepConfig
                + " Expected value: integer for a fixed sleep duration in milliseconds (e.g. 10) "
                + "or a range of latencies separated by a comma (e.g. \"10, 20\") to sleep a random amount in that range.";
        try {
            if (sleepConfig.contains(",")) {
                // random latency within a range.
                Iterable<String> it = Splitter.on(',').split(sleepConfig);
                Integer min = ConversionUtils.convert(Iterables.getFirst(it, "").trim(), Integer.class);
                Integer max = ConversionUtils.convert(Iterables.getLast(it, "").trim(), Integer.class);
                if (min != null && max != null) {
                    return new RandomLatency(min, max);
                }
            } else {
                //fixed latency
                Integer latency = ConversionUtils.convert(sleepConfig.trim(), Integer.class);
                if (latency != null) {
                    return new FixedLatency(latency);
                }
            }
        } catch (Throwable t) {
            throw new IllegalArgumentException(usageMessage, t);
        }
        throw new IllegalArgumentException(usageMessage);
    }

    @Override
    public void configure(String sensorName, WriterConfiguration configuration) {
        Map<String, Object> config = configuration.getSensorConfig(sensorName);
        if (config != null) {
            Object noopLatency = config.get("noopLatency");
            if (noopLatency != null) {
                sleepFunction = getSleepFunction(noopLatency.toString());
            }
        }
    }

    @Override
    public void init(Map stormConf, WriterConfiguration config) throws Exception {
    }

    @Override
    public BulkWriterResponse write(String sensorType, WriterConfiguration configurations, Iterable<Tuple> tuples,
            List<JSONObject> messages) throws Exception {
        if (sleepFunction != null) {
            sleepFunction.apply(null);
        }

        BulkWriterResponse response = new BulkWriterResponse();
        response.addAllSuccesses(tuples);
        return response;
    }

    @Override
    public String getName() {
        return "noop";
    }

    @Override
    public void close() throws Exception {

    }
}