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Apache Solr (module: core)
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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.solr.update.processor;

import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;

/**
 * Factory for {@link DistributedUpdateProcessor}.
 *
 * @see DistributedUpdateProcessor
 * @since 4.0.0
 */
public class DistributedUpdateProcessorFactory extends UpdateRequestProcessorFactory
    implements DistributingUpdateProcessorFactory {

  /**
   * By default, the {@link DistributedUpdateProcessor} is extremely conservative in the list of
   * request params that will be copied/included when updates are forwarded to other nodes. This
   * method may be used by any {@link UpdateRequestProcessorFactory#getInstance} call to annotate a
   * SolrQueryRequest with the names of parameters that should also be forwarded.
   */
  @SuppressWarnings("unchecked")
  public static void addParamToDistributedRequestWhitelist(
      final SolrQueryRequest req, final String... paramNames) {
    Set whitelist =
        (Set)
            req.getContext()
                .computeIfAbsent(
                    DistributedUpdateProcessor.PARAM_WHITELIST_CTX_KEY, key -> new TreeSet<>());
    Collections.addAll(whitelist, paramNames);
  }

  @Override
  public UpdateRequestProcessor getInstance(
      SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next) {

    final boolean isZkAware = req.getCoreContainer().isZooKeeperAware();

    DistributedUpdateProcessor distribUpdateProcessor =
        isZkAware
            ? new DistributedZkUpdateProcessor(req, rsp, next)
            : new DistributedUpdateProcessor(req, rsp, next);
    // note: will sometimes return DURP (no overhead) instead of wrapping
    return RoutedAliasUpdateProcessor.wrap(req, distribUpdateProcessor);
  }
}