org.schedoscope.metascope.util.SampleCacheLoader.java Source code

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Here is the source code for org.schedoscope.metascope.util.SampleCacheLoader.java

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/**
 * Copyright 2017 Otto (GmbH & Co KG)
 * <p>
 * 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
 * <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.schedoscope.metascope.util;

import com.google.common.cache.CacheLoader;
import org.schedoscope.metascope.model.MetascopeField;
import org.schedoscope.metascope.model.MetascopeTable;
import org.schedoscope.metascope.service.MetascopeTableService;
import org.schedoscope.metascope.util.model.HiveQueryResult;
import org.springframework.transaction.annotation.Transactional;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class SampleCacheLoader extends CacheLoader<String, HiveQueryResult> {

    private MetascopeTableService metascopeTableService;
    private HiveQueryExecutor hiveQueryExecutor;

    public SampleCacheLoader(MetascopeTableService metascopeTableService, HiveQueryExecutor hiveQueryExecutor) {
        this.metascopeTableService = metascopeTableService;
        this.hiveQueryExecutor = hiveQueryExecutor;
    }

    @Override
    @Transactional
    public HiveQueryResult load(String fqdn) throws Exception {
        return getSample(fqdn);
    }

    public HiveQueryResult getSample(String fqdn) {
        MetascopeTable table = metascopeTableService.findByFqdn(fqdn);
        if (table == null) {
            return new HiveQueryResult("Internal error");
        }
        Map<String, String> params = new HashMap<String, String>();
        Set<MetascopeField> parameters = table.getParameters();
        if (parameters.size() > 0) {
            MetascopeField parameter = parameters.iterator().next();
            String parameterValue = metascopeTableService.getRandomParameterValue(table, parameter);
            params.put(parameter.getFieldName(), parameterValue);
        }
        HiveQueryResult queryResult = hiveQueryExecutor.executeQuery(table.getDatabaseName(), table.getTableName(),
                table.getFieldsCommaDelimited(), table.getParameters(), params);
        return queryResult;
    }

}