com.intel.ssg.dcst.panthera.processor.PantheraProcessorFactory.java Source code

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Here is the source code for com.intel.ssg.dcst.panthera.processor.PantheraProcessorFactory.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
 *
 *     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.intel.ssg.dcst.panthera.processor;

import static org.apache.commons.lang.StringUtils.isBlank;
import java.util.Map;
import java.util.HashMap;

import org.apache.hadoop.hive.ql.Driver;
import org.apache.hadoop.hive.ql.processors.AddResourceProcessor;
import org.apache.hadoop.hive.ql.processors.CommandProcessor;
import org.apache.hadoop.hive.ql.processors.DeleteResourceProcessor;
import org.apache.hadoop.hive.ql.processors.DfsProcessor;
import org.apache.hadoop.hive.ql.processors.ResetProcessor;
import org.apache.hadoop.hive.ql.processors.SetProcessor;
import org.apache.hadoop.hive.ql.session.SessionState;
import org.apache.hadoop.hive.conf.HiveConf;

import com.intel.ssg.dcst.panthera.parse.SkinDriver;

/**
 * CommandProcessorFactory.
 *
 */
public final class PantheraProcessorFactory {

    private PantheraProcessorFactory() {
        // prevent instantiation
    }

    static Map<HiveConf, Driver> mapDrivers = new HashMap<HiveConf, Driver>();

    public static CommandProcessor get(String cmd) {
        return get(cmd, null);
    }

    public static CommandProcessor get(String cmd, HiveConf conf) {
        String cmdl = cmd.toLowerCase();

        if ("set".equals(cmdl)) {
            return new SetProcessor();
        } else if ("reset".equals(cmdl)) {
            return new ResetProcessor();
        } else if ("dfs".equals(cmdl)) {
            SessionState ss = SessionState.get();
            return new DfsProcessor(ss.getConf());
        } else if ("add".equals(cmdl)) {
            return new AddResourceProcessor();
        } else if ("delete".equals(cmdl)) {
            return new DeleteResourceProcessor();
        } else if (!isBlank(cmd)) {
            if (conf == null) {
                return new SkinDriver();
            }

            SkinDriver drv = (SkinDriver) mapDrivers.get(conf);
            if (drv == null) {
                drv = new SkinDriver();
                mapDrivers.put(conf, drv);
            }
            drv.init();
            return drv;
        }

        return null;
    }

    public static void clean(HiveConf conf) {
        Driver drv = mapDrivers.get(conf);
        if (drv != null) {
            drv.destroy();
        }

        mapDrivers.remove(conf);
    }
}