ElasticSearchConnection.java Source code

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Here is the source code for ElasticSearchConnection.java

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/*******************************************************************************
 * Copyright 2016 IBM Corp.
 *
 * 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.
 *******************************************************************************/

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.admin.indices.mapping.put.PutMappingResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class ElasticSearchConnection {
    private Client client;
    private String index;
    private String hostname;
    private int port;
    private boolean connected = false;

    public ElasticSearchConnection() {
        // use defaults
        index = "healthcenter";
        hostname = "localhost";
        port = 9300;
        setupELK();
    }

    public ElasticSearchConnection(String index, String hostname, int port) {
        this.index = index;
        this.hostname = hostname;
        this.port = port;
        setupELK();
    }

    private void setupELK() {
        try {
            client = TransportClient.builder().build().addTransportAddress(
                    new InetSocketTransportAddress(InetAddress.getByName(getHostname()), getPort()));
            connected = true;
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }

        if (isConnected()) {
            try {
                setIndex();
            } catch (IOException | InterruptedException e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("unable to find elasticsearch server on host " + hostname + " on port " + port);
        }

    }

    private void setIndex() throws IOException, InterruptedException {
        IndicesExistsResponse res = getClient().admin().indices().prepareExists(getIndex()).get();
        if (!res.isExists()) {
            System.out.println("preparing index as index does not exist");
            getClient().admin().indices().prepareCreate(getIndex()).get();
        } else {
            // System.out.println("Index already exists.");
        }
    }

    /*
     * Put the mappings for the data we create into the index. It shouldn't
     * matter if we replace existing records as they should be the same...
     */

    public void putMappings(String fileName, String type) {

        JSONParser parser = new JSONParser();

        try {
            Object obj = parser
                    .parse(new InputStreamReader(ElasticSearchConnection.class.getResourceAsStream(fileName)));

            JSONObject jsonObject = (JSONObject) obj;
            PutMappingResponse response = getClient().admin().indices().preparePutMapping(getIndex()).setType(type)
                    .setSource(jsonObject.toJSONString()).execute().actionGet();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ParseException e) {
            e.printStackTrace();
        }

    }

    public Client getClient() {
        return client;
    }

    public void shutdown() {
        client.close();
        client = null;
    }

    public String getIndex() {
        return index;
    }

    public String getHostname() {
        return hostname;
    }

    public int getPort() {
        return port;
    }

    public boolean isConnected() {
        return connected;
    }

}