org.apache.gobblin.data.management.dataset.SimpleDatasetHierarchicalPrioritizer.java Source code

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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.gobblin.data.management.dataset;

import java.io.IOException;
import java.io.Serializable;
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.google.common.collect.Maps;

import lombok.AllArgsConstructor;

import org.apache.gobblin.annotation.Alias;
import org.apache.gobblin.configuration.State;
import org.apache.gobblin.data.management.copy.AllEqualComparator;
import org.apache.gobblin.dataset.Dataset;
import org.apache.gobblin.util.request_allocation.Requestor;
import org.apache.gobblin.util.request_allocation.SimpleHierarchicalPrioritizer;

/**
 * A simple type of {@link SimpleHierarchicalPrioritizer} which prioritize {@link Dataset} based on their tier name.
 *
 *  1-1-1 mapping between {@link Dataset} - {@link SimpleDatasetRequest} - {@link SimpleDatasetRequestor}
 *
 * {@link org.apache.gobblin.util.request_allocation.HierarchicalAllocator} will use {@link TierComparator} from this class
 * to shuffle {@link SimpleDatasetRequestor}s so that high priority tiers will appear in front of low priority tiers.
 *
 * Usage:
 * {@link #TIER_KEY}.<tier-number>=<whitelist-blacklist-pattern>
 * Example:
 * {@link #TIER_KEY}.0 = pattern_0
 * {@link #TIER_KEY}.1 = pattern_1
 */
@Alias("TieredDatasets")
public class SimpleDatasetHierarchicalPrioritizer extends SimpleHierarchicalPrioritizer<SimpleDatasetRequest>
        implements Serializable {

    public static final String CONFIGURATION_PREFIX = "gobblin.prioritizer.datasetTiering";
    public static final String TIER_KEY = CONFIGURATION_PREFIX + ".tier";
    private static final Pattern TIER_PATTERN = Pattern.compile(TIER_KEY + "\\.([0-9]+)");

    public SimpleDatasetHierarchicalPrioritizer(State state) throws IOException {
        super(SimpleDatasetHierarchicalPrioritizer.createRequestorComparator(state), new AllEqualComparator());
    }

    public static Comparator<Requestor<SimpleDatasetRequest>> createRequestorComparator(State state)
            throws IOException {
        TreeMap<Integer, Pattern> tiers = Maps.newTreeMap();

        Matcher matcher;
        for (Map.Entry<Object, Object> entry : state.getProperties().entrySet()) {
            if (entry.getKey() instanceof String && entry.getValue() instanceof String
                    && (matcher = TIER_PATTERN.matcher((String) entry.getKey())).matches()) {
                int tier = Integer.parseInt(matcher.group(1));
                String regex = (String) entry.getValue();
                tiers.put(tier, Pattern.compile(regex));
            }
        }

        return new SimpleDatasetHierarchicalPrioritizer.TierComparator(tiers);
    }

    @AllArgsConstructor
    private static class TierComparator implements Comparator<Requestor<SimpleDatasetRequest>>, Serializable {
        private final TreeMap<Integer, Pattern> tiersMap;

        @Override
        public int compare(Requestor<SimpleDatasetRequest> o1, Requestor<SimpleDatasetRequest> o2) {
            return Integer.compare(findTier(o1), findTier(o2));
        }

        private int findTier(Requestor<SimpleDatasetRequest> requestor) {

            Dataset dataset = ((SimpleDatasetRequestor) requestor).getDataset();

            for (Map.Entry<Integer, Pattern> tier : tiersMap.entrySet()) {
                Pattern pattern = tier.getValue();
                if (pattern.matcher(dataset.datasetURN()).find()) {
                    return tier.getKey();
                }
            }
            return Integer.MAX_VALUE;
        }
    }
}