org.apache.hoya.yarn.service.CompoundLaunchedService.java Source code

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Here is the source code for org.apache.hoya.yarn.service.CompoundLaunchedService.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.hoya.yarn.service;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.service.Service;
import org.apache.hadoop.yarn.service.launcher.LauncherExitCodes;
import org.apache.hadoop.yarn.service.launcher.RunService;
import org.apache.hoya.exceptions.BadCommandArgumentsException;
import org.apache.hoya.tools.HoyaUtils;

public class CompoundLaunchedService extends CompoundService implements RunService {

    private String[] argv;

    public CompoundLaunchedService(String name) {
        super(name);
    }

    public CompoundLaunchedService() {
        super("CompoundLaunchedService");
    }

    public CompoundLaunchedService(Service... children) {
        super(children);
    }

    /**
     * Implementation of set-ness, groovy definition of true/false for a string
     * @param s
     * @return
     */
    protected static boolean isUnset(String s) {
        return HoyaUtils.isUnset(s);
    }

    protected static boolean isSet(String s) {
        return HoyaUtils.isSet(s);
    }

    protected String[] getArgv() {
        return argv;
    }

    /**
     * Pre-init argument binding
     * @param config the initial configuration build up by the
     * service launcher.
     * @param args argument list list of arguments passed to the command line
     * after any launcher-specific commands have been stripped.
     * @return the configuration
     * @throws Exception
     */
    @Override
    public Configuration bindArgs(Configuration config, String... args) throws Exception {
        this.argv = args;
        return config;
    }

    @Override
    public int runService() throws Throwable {
        return LauncherExitCodes.EXIT_SUCCESS;
    }

    /**
     * Run a child service -initing and starting it if this
     * service has already passed those parts of its own lifecycle
     * @param service the service to start
     */
    protected void runChildService(Service service) {
        service.init(getConfig());
        if (isInState(STATE.STARTED)) {
            service.start();
        }
        addService(service);
    }

    protected void requireArgumentSet(String argname, String argfield) throws BadCommandArgumentsException {
        if (isUnset(argfield)) {
            throw new BadCommandArgumentsException("Required argument " + argname + " missing");
        }
    }

    protected void requireArgumentSet(String argname, Object argfield) throws BadCommandArgumentsException {
        if (argfield == null) {
            throw new BadCommandArgumentsException("Required argument " + argname + " missing");
        }
    }
}