io.covert.dns.storage.StorageMapper.java Source code

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Here is the source code for io.covert.dns.storage.StorageMapper.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 io.covert.dns.storage;

import java.util.Map;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;

public class StorageMapper extends Mapper<Text, Text, NullWritable, NullWritable> {

    StorageModule storageModule = null;
    ObjectMapper objectMapper = new ObjectMapper();

    protected void setup(Context context) throws java.io.IOException, InterruptedException {
        Configuration conf = context.getConfiguration();
        try {
            Class<StorageModuleFactory> clz = (Class<StorageModuleFactory>) Class
                    .forName(conf.get("storage.module.factory"));
            StorageModuleFactory factory = clz.newInstance();
            storageModule = factory.create(conf);

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    protected void map(Text jsonRecord, Text empty, Context context)
            throws java.io.IOException, InterruptedException {
        Map<String, Object> record;
        try {
            record = objectMapper.readValue(jsonRecord.getBytes(), new TypeReference<Map<String, Object>>() {
            });
        } catch (Exception e) {
            context.getCounter("ERROR:" + e.getClass().getSimpleName(), "BAD_RECORDS").increment(1);
            return;
        }

        try {
            storageModule.store(record);
            context.getCounter(storageModule.getClass().getSimpleName(), "RECORDS_STORED").increment(1);
        } catch (Exception e) {
            context.getCounter("ERROR:" + e.getClass().getSimpleName(),
                    "FAILED_STORE:" + storageModule.getClass().getSimpleName()).increment(1);
        }
        context.getCounter("TOTAL", "RECORDS").increment(1);
        context.progress();
    }

    protected void cleanup(Context context) throws java.io.IOException, InterruptedException {
        storageModule.flush();
        storageModule.close();
    }
}