org.apache.hadoop.yarn.util.AuxiliaryServiceHelper.java Source code

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Here is the source code for org.apache.hadoop.yarn.util.AuxiliaryServiceHelper.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.hadoop.yarn.util;

import java.nio.ByteBuffer;
import java.util.Map;

import org.apache.commons.codec.binary.Base64;

public class AuxiliaryServiceHelper {

    public final static String NM_AUX_SERVICE = "NM_AUX_SERVICE_";

    public static ByteBuffer getServiceDataFromEnv(String serviceName, Map<String, String> env) {
        String meta = env.get(getPrefixServiceName(serviceName));
        if (null == meta) {
            return null;
        }
        byte[] metaData = Base64.decodeBase64(meta);
        return ByteBuffer.wrap(metaData);
    }

    public static void setServiceDataIntoEnv(String serviceName, ByteBuffer metaData, Map<String, String> env) {
        byte[] byteData = metaData.array();
        env.put(getPrefixServiceName(serviceName), Base64.encodeBase64String(byteData));
    }

    public static String getPrefixServiceName(String serviceName) {
        return NM_AUX_SERVICE + serviceName;
    }
}