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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 org.apache.solr.core.SolrCore;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.util.plugin.NamedListInitializedPlugin;
import org.apache.solr.util.plugin.SolrCoreAware;

/**
 * A factory to generate an UpdateRequestProcessor for each request.
 *
 * If the factory needs access to {@link SolrCore} in initialization, it could implement {@link
 * SolrCoreAware}
 *
 * @since solr 1.3
 */
public abstract class UpdateRequestProcessorFactory implements NamedListInitializedPlugin {

  /**
   * A marker interface for UpdateRequestProcessorFactory implementations indicating that the
   * factory should be used even if the update.distrib parameter would otherwise cause it to not be
   * run.
   */
  public interface RunAlways {}

  public abstract UpdateRequestProcessor getInstance(
      SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next);
}