gov.nasa.jpl.mudrod.recommendation.pre.ImportMetadata.java Source code

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Here is the source code for gov.nasa.jpl.mudrod.recommendation.pre.ImportMetadata.java

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/*
 * Licensed 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 gov.nasa.jpl.mudrod.recommendation.pre;

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import gov.nasa.jpl.mudrod.discoveryengine.DiscoveryStepAbstract;
import gov.nasa.jpl.mudrod.driver.ESDriver;
import gov.nasa.jpl.mudrod.driver.SparkDriver;
import gov.nasa.jpl.mudrod.main.MudrodConstants;
import gov.nasa.jpl.mudrod.metadata.pre.ApiHarvester;
import org.apache.commons.io.IOUtils;
import org.elasticsearch.action.index.IndexRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Properties;

/**
 * ClassName: Import Metadata to elasticsearch
 */

public class ImportMetadata extends DiscoveryStepAbstract {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private static final Logger LOG = LoggerFactory.getLogger(ApiHarvester.class);

    public ImportMetadata(Properties props, ESDriver es, SparkDriver spark) {
        super(props, es, spark);
    }

    @Override
    public Object execute() {
        LOG.info("Starting Metadata Harvesting");
        startTime = System.currentTimeMillis();
        addMetadataMapping();
        importToES();
        endTime = System.currentTimeMillis();
        es.refreshIndex();
        LOG.info("Finished Metadata Harvesting time elapsed: {}s", (endTime - startTime) / 1000);
        return null;
    }

    /**
     * addMetadataMapping: Add mapping to index metadata in Elasticsearch. Please
     * invoke this method before import metadata to Elasticsearch.
     */
    public void addMetadataMapping() {
        String mappingJson = "{\r\n   \"dynamic_templates\": " + "[\r\n      " + "{\r\n         \"strings\": "
                + "{\r\n            \"match_mapping_type\": \"string\","
                + "\r\n            \"mapping\": {\r\n               \"type\": \"string\","
                + "\r\n               \"analyzer\": \"csv\"\r\n            }"
                + "\r\n         }\r\n      }\r\n   ]\r\n}";

        es.getClient().admin().indices().preparePutMapping(props.getProperty(MudrodConstants.ES_INDEX_NAME))
                .setType(props.getProperty("recom_metadataType")).setSource(mappingJson).execute().actionGet();

    }

    /**
     * importToES: Index metadata into elasticsearch from local file directory.
     * Please make sure metadata have been harvest from web service before
     * invoking this method.
     */
    private void importToES() {
        es.deleteType(props.getProperty("indexName"), props.getProperty("recom_metadataType"));

        es.createBulkProcessor();
        File directory = new File(props.getProperty(MudrodConstants.RAW_METADATA_PATH));
        File[] fList = directory.listFiles();
        for (File file : fList) {
            InputStream is;
            try {
                is = new FileInputStream(file);
                try {
                    String jsonTxt = IOUtils.toString(is);
                    JsonParser parser = new JsonParser();
                    JsonElement item = parser.parse(jsonTxt);
                    IndexRequest ir = new IndexRequest(props.getProperty(MudrodConstants.ES_INDEX_NAME),
                            props.getProperty("recom_metadataType")).source(item.toString());

                    // preprocessdata

                    es.getBulkProcessor().add(ir);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }

        es.destroyBulkProcessor();
    }

    @Override
    public Object execute(Object o) {
        return null;
    }
}