org.apache.hadoop.hdfs.protocolPB.ReconfigurationProtocolUtils.java Source code

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Here is the source code for org.apache.hadoop.hdfs.protocolPB.ReconfigurationProtocolUtils.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.hdfs.protocolPB;

import java.util.Map;

import org.apache.hadoop.conf.ReconfigurationTaskStatus;
import org.apache.hadoop.conf.ReconfigurationUtil.PropertyChange;
import org.apache.hadoop.hdfs.protocol.proto.ReconfigurationProtocolProtos.GetReconfigurationStatusConfigChangeProto;
import org.apache.hadoop.hdfs.protocol.proto.ReconfigurationProtocolProtos.GetReconfigurationStatusResponseProto;

import com.google.common.base.Optional;
import com.google.common.collect.Maps;

/**
 * This is a client side utility class that handles
 * common logic to to parameter reconfiguration.
 */
public final class ReconfigurationProtocolUtils {
    private ReconfigurationProtocolUtils() {
    }

    public static ReconfigurationTaskStatus getReconfigurationStatus(
            GetReconfigurationStatusResponseProto response) {
        Map<PropertyChange, Optional<String>> statusMap = null;
        long startTime;
        long endTime = 0;

        startTime = response.getStartTime();
        if (response.hasEndTime()) {
            endTime = response.getEndTime();
        }
        if (response.getChangesCount() > 0) {
            statusMap = Maps.newHashMap();
            for (GetReconfigurationStatusConfigChangeProto change : response.getChangesList()) {
                PropertyChange pc = new PropertyChange(change.getName(), change.getNewValue(),
                        change.getOldValue());
                String errorMessage = null;
                if (change.hasErrorMessage()) {
                    errorMessage = change.getErrorMessage();
                }
                statusMap.put(pc, Optional.fromNullable(errorMessage));
            }
        }
        return new ReconfigurationTaskStatus(startTime, endTime, statusMap);
    }
}