org.apache.tajo.cli.tools.TajoGetConf.java Source code

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Here is the source code for org.apache.tajo.cli.tools.TajoGetConf.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 org.apache.tajo.cli.tools;

import com.google.protobuf.ServiceException;
import org.apache.commons.cli.*;
import org.apache.tajo.client.TajoClient;
import org.apache.tajo.conf.TajoConf;
import org.apache.tajo.util.NetUtils;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.net.InetSocketAddress;
import java.sql.SQLException;

public class TajoGetConf {
    private static final org.apache.commons.cli.Options options;

    static {
        options = new Options();
        options.addOption("h", "host", true, "Tajo server host");
        options.addOption("p", "port", true, "Tajo server port");
    }

    private TajoConf tajoConf;
    private Writer writer;

    public final static String defaultLeftPad = " ";
    public final static String defaultDescPad = "   ";

    public TajoGetConf(TajoConf tajoConf, Writer writer) {
        this(tajoConf, writer, null);
    }

    public TajoGetConf(TajoConf tajoConf, Writer writer, TajoClient tajoClient) {
        this.tajoConf = tajoConf;
        this.writer = writer;
    }

    private void printUsage(boolean tsqlMode) {
        if (!tsqlMode) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp("getconf <key> [options]", options);
        }
        System.out.println(defaultLeftPad + "key" + defaultDescPad + "gets a specific key from the configuration");
    }

    public void runCommand(String[] args) throws Exception {
        runCommand(args, true);
    }

    public void runCommand(String[] args, boolean tsqlMode) throws Exception {
        CommandLineParser parser = new PosixParser();

        if (args.length == 0) {
            printUsage(tsqlMode);
            return;
        }

        CommandLine cmd = parser.parse(options, args);

        String hostName = null;
        Integer port = null;
        if (cmd.hasOption("h")) {
            hostName = cmd.getOptionValue("h");
        }
        if (cmd.hasOption("p")) {
            port = Integer.parseInt(cmd.getOptionValue("p"));
        }

        String param;
        if (cmd.getArgs().length > 1) {
            printUsage(tsqlMode);
            return;
        } else {
            param = cmd.getArgs()[0];
        }

        // if there is no "-h" option,
        InetSocketAddress address = tajoConf.getSocketAddrVar(TajoConf.ConfVars.TAJO_MASTER_CLIENT_RPC_ADDRESS,
                TajoConf.ConfVars.TAJO_MASTER_UMBILICAL_RPC_ADDRESS);

        if (hostName == null) {
            hostName = address.getHostName();
        }

        if (port == null) {
            port = address.getPort();
        }

        if ((hostName == null) ^ (port == null)) {
            return;
        } else if (hostName != null && port != null) {
            tajoConf.setVar(TajoConf.ConfVars.TAJO_MASTER_CLIENT_RPC_ADDRESS,
                    NetUtils.getHostPortString(hostName, port));
        }

        processConfKey(writer, param);
        writer.flush();
    }

    private void processConfKey(Writer writer, String param)
            throws ParseException, IOException, ServiceException, SQLException {
        String value = tajoConf.getTrimmed(param);

        // If there is no value in the configuration file, we need to find all ConfVars.
        if (value == null) {
            for (TajoConf.ConfVars vars : TajoConf.ConfVars.values()) {
                if (vars.varname.equalsIgnoreCase(param)) {
                    value = tajoConf.getVar(vars);
                    break;
                }
            }
        }

        if (value != null) {
            writer.write(value);
        } else {
            writer.write("Configuration " + param + " is missing.");
        }

        writer.write("\n");
    }

    public static void main(String[] args) throws Exception {
        TajoConf conf = new TajoConf();

        try (Writer writer = new PrintWriter(System.out)) {
            TajoGetConf admin = new TajoGetConf(conf, writer);
            admin.runCommand(args, false);
        } finally {
            System.exit(0);
        }
    }
}