com.linkedin.pinot.routing.RoutingTableSelectorFactory.java Source code

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Here is the source code for com.linkedin.pinot.routing.RoutingTableSelectorFactory.java

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/**
 * Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
 *
 * 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 com.linkedin.pinot.routing;

import org.apache.commons.configuration.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RoutingTableSelectorFactory {
    private static Logger LOGGER = LoggerFactory.getLogger(RoutingTableSelectorFactory.class);

    private static String CLASSNAME_KEY = "class";
    private static String defaultClasssName = PercentageBasedRoutingTableSelector.class.getName();

    /*
     * "class" indicates the class to load. If it is null, the load the default class. with the configuration as
     * constructor.
     */
    public static RoutingTableSelector getRoutingTableSelector(Configuration config) {
        RoutingTableSelector routingTableSelector = new PercentageBasedRoutingTableSelector();
        if (config == null) {
            LOGGER.warn("No config for routing table selector. Using default");
        } else {
            String selectorClassName = null;
            try {
                selectorClassName = (String) config.getProperty(CLASSNAME_KEY);
            } catch (Exception e) {
                LOGGER.warn("Could not parse property '{}'. Using {}", CLASSNAME_KEY, defaultClasssName, e);
            }

            Class<? extends RoutingTableSelector> clazz;
            if (selectorClassName == null || selectorClassName.isEmpty()) {
                LOGGER.info("Null or empty selector class name. Using default");
            } else {
                try {
                    clazz = (Class<? extends RoutingTableSelector>) Class.forName(selectorClassName);
                    routingTableSelector = clazz.newInstance();
                } catch (ClassNotFoundException e) {
                    LOGGER.warn("Could not load '{}'. Loading {}", selectorClassName, defaultClasssName, e);
                } catch (InstantiationException e) {
                    LOGGER.warn("Could not instantiate '{}'. Instantiating {}", selectorClassName,
                            defaultClasssName, e);
                } catch (IllegalAccessException e) {
                    LOGGER.warn("Could not instantiate '{}'. Instantiating {}", selectorClassName,
                            defaultClasssName, e);
                }
            }
        }

        routingTableSelector.init(config);

        return routingTableSelector;
    }
}