org.apache.druid.client.BatchServerInventoryView.java Source code

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Here is the source code for org.apache.druid.client.BatchServerInventoryView.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.druid.client;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import com.google.inject.Inject;
import org.apache.curator.framework.CuratorFramework;
import org.apache.druid.guice.ManageLifecycle;
import org.apache.druid.java.util.common.ISE;
import org.apache.druid.java.util.common.Pair;
import org.apache.druid.java.util.emitter.EmittingLogger;
import org.apache.druid.server.coordination.DruidServerMetadata;
import org.apache.druid.server.initialization.ZkPathsConfig;
import org.apache.druid.timeline.DataSegment;

import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;

/**
 * This class is deprecated. Use {@link HttpServerInventoryView} instead.
 */
@Deprecated
@ManageLifecycle
public class BatchServerInventoryView extends AbstractCuratorServerInventoryView<Set<DataSegment>>
        implements FilteredServerInventoryView {
    private static final EmittingLogger log = new EmittingLogger(BatchServerInventoryView.class);

    private final ConcurrentMap<String, Set<DataSegment>> zNodes = new ConcurrentHashMap<>();
    private final ConcurrentMap<SegmentCallback, Predicate<Pair<DruidServerMetadata, DataSegment>>> segmentPredicates = new ConcurrentHashMap<>();
    private final Predicate<Pair<DruidServerMetadata, DataSegment>> defaultFilter;

    @Inject
    public BatchServerInventoryView(final ZkPathsConfig zkPaths, final CuratorFramework curator,
            final ObjectMapper jsonMapper, final Predicate<Pair<DruidServerMetadata, DataSegment>> defaultFilter) {
        super(log, zkPaths.getAnnouncementsPath(), zkPaths.getLiveSegmentsPath(), curator, jsonMapper,
                new TypeReference<Set<DataSegment>>() {
                });

        this.defaultFilter = Preconditions.checkNotNull(defaultFilter);
    }

    @Override
    protected DruidServer addInnerInventory(final DruidServer container, String inventoryKey,
            final Set<DataSegment> inventory) {
        Set<DataSegment> filteredInventory = filterInventory(container, inventory);
        zNodes.put(inventoryKey, filteredInventory);
        for (DataSegment segment : filteredInventory) {
            addSingleInventory(container, segment);
        }
        return container;
    }

    private Set<DataSegment> filterInventory(final DruidServer container, Set<DataSegment> inventory) {
        Predicate<Pair<DruidServerMetadata, DataSegment>> predicate = Predicates.or(defaultFilter,
                Predicates.or(segmentPredicates.values()));

        // make a copy of the set and not just a filtered view, in order to not keep all the segment data in memory
        Set<DataSegment> filteredInventory = Sets.newHashSet(Iterables.transform(Iterables.filter(
                Iterables.transform(inventory, new Function<DataSegment, Pair<DruidServerMetadata, DataSegment>>() {
                    @Override
                    public Pair<DruidServerMetadata, DataSegment> apply(DataSegment input) {
                        return Pair.of(container.getMetadata(), input);
                    }
                }), predicate), new Function<Pair<DruidServerMetadata, DataSegment>, DataSegment>() {
                    @Override
                    public DataSegment apply(Pair<DruidServerMetadata, DataSegment> input) {
                        return input.rhs;
                    }
                }));
        return filteredInventory;
    }

    @Override
    protected DruidServer updateInnerInventory(DruidServer container, String inventoryKey,
            Set<DataSegment> inventory) {
        Set<DataSegment> filteredInventory = filterInventory(container, inventory);

        Set<DataSegment> existing = zNodes.get(inventoryKey);
        if (existing == null) {
            throw new ISE("Trying to update an inventoryKey[%s] that didn't exist?!", inventoryKey);
        }

        for (DataSegment segment : Sets.difference(filteredInventory, existing)) {
            addSingleInventory(container, segment);
        }
        for (DataSegment segment : Sets.difference(existing, filteredInventory)) {
            removeSingleInventory(container, segment.getIdentifier());
        }
        zNodes.put(inventoryKey, filteredInventory);

        return container;
    }

    @Override
    protected DruidServer removeInnerInventory(final DruidServer container, String inventoryKey) {
        log.debug("Server[%s] removed container[%s]", container.getName(), inventoryKey);
        Set<DataSegment> segments = zNodes.remove(inventoryKey);

        if (segments == null) {
            log.warn("Told to remove container[%s], which didn't exist", inventoryKey);
            return container;
        }

        for (DataSegment segment : segments) {
            removeSingleInventory(container, segment.getIdentifier());
        }
        return container;
    }

    @Override
    public void registerSegmentCallback(final Executor exec, final SegmentCallback callback,
            final Predicate<Pair<DruidServerMetadata, DataSegment>> filter) {
        SegmentCallback filteringCallback = new SingleServerInventoryView.FilteringSegmentCallback(callback,
                filter);
        segmentPredicates.put(filteringCallback, filter);
        registerSegmentCallback(exec, filteringCallback);
    }

    @Override
    protected void segmentCallbackRemoved(SegmentCallback callback) {
        segmentPredicates.remove(callback);
    }
}