org.apache.lens.driver.es.client.jest.JestClientImpl.java Source code

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Here is the source code for org.apache.lens.driver.es.client.jest.JestClientImpl.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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.lens.driver.es.client.jest;

import org.apache.lens.driver.es.ESDriverConfig;
import org.apache.lens.driver.es.ESQuery;
import org.apache.lens.driver.es.client.ESClient;
import org.apache.lens.driver.es.client.ESResultSet;
import org.apache.lens.driver.es.exceptions.ESClientException;

import org.apache.commons.lang3.Validate;
import org.apache.hadoop.conf.Configuration;

import io.searchbox.client.JestClient;
import io.searchbox.client.JestClientFactory;
import io.searchbox.client.config.HttpClientConfig;
import io.searchbox.core.Explain;
import io.searchbox.core.Search;
import io.searchbox.core.SearchResult;
import lombok.NonNull;

/**
 * The ESRestClient for firing queries on elastic search
 */
public class JestClientImpl extends ESClient {

    private static final int DEFAULT_MAX_CONN = 10;
    private static final boolean DEFAULT_MULTI_THREADED = true;
    private static final String IS_MULTITHREADED = "lens.driver.es.jest.is.multi.threaded";
    private static final String MAX_TOTAL_CONN = "lens.driver.es.jest.max.conn";
    private static final String ES_SERVERS = "lens.driver.es.jest.servers";

    @NonNull
    private final JestClient client;

    public JestClientImpl(ESDriverConfig esDriverConfig, Configuration conf) {
        super(esDriverConfig, conf);
        final JestClientFactory factory = new JestClientFactory();
        factory.setHttpClientConfig(
                new HttpClientConfig.Builder(Validate.notNull(conf.getStringCollection(ES_SERVERS)))
                        .maxTotalConnection(conf.getInt(MAX_TOTAL_CONN, DEFAULT_MAX_CONN))
                        .multiThreaded(conf.getBoolean(IS_MULTITHREADED, DEFAULT_MULTI_THREADED))
                        .readTimeout(esDriverConfig.getQueryTimeOutMs()).build());
        client = factory.getObject();
    }

    @Override
    public ESResultSet executeImpl(ESQuery esQuery) throws ESClientException {
        try {
            final Search search = new Search.Builder(esQuery.getQuery()).addIndex(esQuery.getIndex())
                    .addType(esQuery.getType()).build();
            final SearchResult result = client.execute(search);
            if (result == null) {
                throw new NullPointerException("Got null result from client for " + esQuery);
            }
            return JestResultSetTransformer.transformFrom(result.getJsonObject(), esQuery.getSchema(),
                    esQuery.getColumns());
        } catch (Exception e) {
            throw new ESClientException("Execution failed, ", e);
        }
    }

    public String explain(ESQuery esQuery) throws ESClientException {
        try {
            return client.execute(
                    new Explain.Builder(esQuery.getIndex(), esQuery.getType(), null, esQuery.getQuery()).build())
                    .getJsonString();
        } catch (Exception e) {
            throw new ESClientException("Explanation failed, ", e);
        }
    }

}