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

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Here is the source code for org.apache.druid.client.SingleServerInventoryView.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.Preconditions;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.inject.Inject;
import org.apache.curator.framework.CuratorFramework;
import org.apache.druid.guice.ManageLifecycle;
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.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.Executor;

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

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

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

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

    @Override
    protected DruidServer addInnerInventory(DruidServer container, String inventoryKey, DataSegment inventory) {
        Predicate<Pair<DruidServerMetadata, DataSegment>> predicate = Predicates.or(defaultFilter,
                Predicates.or(segmentPredicates.values()));
        if (predicate.apply(Pair.of(container.getMetadata(), inventory))) {
            addSingleInventory(container, inventory);
        }
        return container;
    }

    @Override
    protected DruidServer updateInnerInventory(DruidServer container, String inventoryKey, DataSegment inventory) {
        return addInnerInventory(container, inventoryKey, inventory);
    }

    @Override
    protected DruidServer removeInnerInventory(DruidServer container, String inventoryKey) {
        removeSingleInventory(container, inventoryKey);
        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);
    }

    static class FilteringSegmentCallback implements SegmentCallback {

        private final SegmentCallback callback;
        private final Predicate<Pair<DruidServerMetadata, DataSegment>> filter;

        FilteringSegmentCallback(SegmentCallback callback,
                Predicate<Pair<DruidServerMetadata, DataSegment>> filter) {
            this.callback = callback;
            this.filter = filter;
        }

        @Override
        public CallbackAction segmentAdded(DruidServerMetadata server, DataSegment segment) {
            final CallbackAction action;
            if (filter.apply(Pair.of(server, segment))) {
                action = callback.segmentAdded(server, segment);
            } else {
                action = CallbackAction.CONTINUE;
            }
            return action;
        }

        @Override
        public CallbackAction segmentRemoved(DruidServerMetadata server, DataSegment segment) {
            final CallbackAction action;
            if (filter.apply(Pair.of(server, segment))) {
                action = callback.segmentRemoved(server, segment);
            } else {
                action = CallbackAction.CONTINUE;
            }
            return action;
        }

        @Override
        public CallbackAction segmentViewInitialized() {
            return callback.segmentViewInitialized();
        }
    }

}