io.druid.server.lookup.cache.LookupNodeDiscovery.java Source code

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Here is the source code for io.druid.server.lookup.cache.LookupNodeDiscovery.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.server.lookup.cache;

import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableSet;
import io.druid.discovery.DiscoveryDruidNode;
import io.druid.discovery.DruidNodeDiscovery;
import io.druid.discovery.DruidNodeDiscoveryProvider;
import io.druid.discovery.LookupNodeService;
import io.druid.server.http.HostAndPortWithScheme;

import javax.annotation.Nullable;
import java.util.Collection;
import java.util.Set;

/**
 * A Helper class that uses DruidNodeDiscovery to discover lookup nodes and tiers.
 */
public class LookupNodeDiscovery {
    private final DruidNodeDiscovery druidNodeDiscovery;

    LookupNodeDiscovery(DruidNodeDiscoveryProvider druidNodeDiscoveryProvider) {
        this.druidNodeDiscovery = druidNodeDiscoveryProvider.getForService(LookupNodeService.DISCOVERY_SERVICE_KEY);
    }

    public Collection<HostAndPortWithScheme> getNodesInTier(String tier) {
        return Collections2.transform(
                Collections2.filter(druidNodeDiscovery.getAllNodes(), new Predicate<DiscoveryDruidNode>() {
                    @Override
                    public boolean apply(@Nullable DiscoveryDruidNode node) {
                        return tier.equals(((LookupNodeService) node.getServices()
                                .get(LookupNodeService.DISCOVERY_SERVICE_KEY)).getLookupTier());
                    }
                }), new Function<DiscoveryDruidNode, HostAndPortWithScheme>() {
                    @Override
                    public HostAndPortWithScheme apply(@Nullable DiscoveryDruidNode input) {
                        return HostAndPortWithScheme.fromString(input.getDruidNode().getServiceScheme(),
                                input.getDruidNode().getHostAndPortToUse());
                    }
                });
    }

    public Set<String> getAllTiers() {
        ImmutableSet.Builder<String> builder = new ImmutableSet.Builder<>();

        druidNodeDiscovery.getAllNodes().stream()
                .forEach(node -> builder
                        .add(((LookupNodeService) node.getServices().get(LookupNodeService.DISCOVERY_SERVICE_KEY))
                                .getLookupTier()));

        return builder.build();
    }
}