org.apache.blur.mapreduce.lib.BlurInputFormatSplitCommand.java Source code

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Here is the source code for org.apache.blur.mapreduce.lib.BlurInputFormatSplitCommand.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.blur.mapreduce.lib;

import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.blur.command.BlurArray;
import org.apache.blur.command.BlurObject;
import org.apache.blur.command.CombiningContext;
import org.apache.blur.command.IndexContext;
import org.apache.blur.command.Location;
import org.apache.blur.command.annotation.RequiredArgument;
import org.apache.blur.command.commandtype.ClusterServerReadCommandSingleTable;
import org.apache.blur.mapreduce.lib.BlurInputFormat.BlurInputSplit;
import org.apache.blur.server.ShardContext;
import org.apache.blur.server.TableContext;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;

public class BlurInputFormatSplitCommand extends ClusterServerReadCommandSingleTable<BlurObject> {

    @RequiredArgument
    private String snapshot;

    @Override
    public BlurObject execute(IndexContext context) throws IOException, InterruptedException {
        String shard = context.getShard().getShard();
        TableContext tableContext = context.getTableContext();
        ShardContext shardContext = ShardContext.create(tableContext, shard);

        Path shardDir = shardContext.getHdfsDirPath();
        Configuration configuration = tableContext.getConfiguration();
        String table = tableContext.getTable();
        Directory directory = getDirectory(context.getIndexReader());

        List<BlurInputSplit> list = BlurInputFormat.getSplitForDirectory(shardDir, configuration, table, snapshot,
                directory);
        BlurArray splits = BlurInputFormat.toBlurArray(list);
        BlurObject blurObject = new BlurObject();
        blurObject.put(shard, splits);
        return blurObject;
    }

    private Directory getDirectory(IndexReader indexReader) {
        DirectoryReader directoryReader = (DirectoryReader) indexReader;
        return directoryReader.directory();
    }

    @Override
    public BlurObject combine(CombiningContext context, Map<? extends Location<?>, BlurObject> results)
            throws IOException, InterruptedException {
        BlurObject blurObject = new BlurObject();
        for (BlurObject shardSplits : results.values()) {
            Iterator<String> keys = shardSplits.keys();
            while (keys.hasNext()) {
                String key = keys.next();
                blurObject.put(key, shardSplits.getBlurArray(key));
            }
        }
        return blurObject;
    }

    @Override
    public String getName() {
        return "input-format-split";
    }

    public String getSnapshot() {
        return snapshot;
    }

    public void setSnapshot(String snapshot) {
        this.snapshot = snapshot;
    }

}