| /* |
| * 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.io.Closeable; |
| import java.io.IOException; |
| import java.lang.invoke.MethodHandles; |
| |
| import org.apache.solr.common.SolrException; |
| import org.apache.solr.update.AddUpdateCommand; |
| import org.apache.solr.update.CommitUpdateCommand; |
| import org.apache.solr.update.DeleteUpdateCommand; |
| import org.apache.solr.update.MergeIndexesCommand; |
| import org.apache.solr.update.RollbackUpdateCommand; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * This is a good place for subclassed update handlers to process the document before it is |
| * indexed. You may wish to add/remove fields or check if the requested user is allowed to |
| * update the given document... |
| * |
| * Perhaps you continue adding an error message (without indexing the document)... |
| * perhaps you throw an error and halt indexing (remove anything already indexed??) |
| * |
| * By default, this just passes the request to the next processor in the chain. |
| * |
| * @since solr 1.3 |
| */ |
| public abstract class UpdateRequestProcessor implements Closeable { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| protected final UpdateRequestProcessor next; |
| |
| public UpdateRequestProcessor( UpdateRequestProcessor next) { |
| this.next = next; |
| } |
| |
| public void processAdd(AddUpdateCommand cmd) throws IOException { |
| if (next != null) next.processAdd(cmd); |
| } |
| |
| public void processDelete(DeleteUpdateCommand cmd) throws IOException { |
| if (next != null) next.processDelete(cmd); |
| } |
| |
| public void processMergeIndexes(MergeIndexesCommand cmd) throws IOException { |
| if (next != null) next.processMergeIndexes(cmd); |
| } |
| |
| public void processCommit(CommitUpdateCommand cmd) throws IOException |
| { |
| if (next != null) next.processCommit(cmd); |
| } |
| |
| /** |
| * @since Solr 1.4 |
| */ |
| public void processRollback(RollbackUpdateCommand cmd) throws IOException |
| { |
| if (next != null) next.processRollback(cmd); |
| } |
| |
| public void finish() throws IOException { |
| if (next != null) next.finish(); |
| } |
| |
| @Override |
| public final void close() throws IOException { |
| @SuppressWarnings("resource") |
| UpdateRequestProcessor p = this; |
| while (p != null) { |
| try { |
| p.doClose(); |
| } catch(Exception e) { |
| SolrException.log(log, "Exception closing processor", e); |
| } |
| p = p.next; |
| } |
| } |
| |
| /** |
| * Override to implement resource release logic that *must* be called at the |
| * end of a request. |
| */ |
| protected void doClose() {} |
| } |
| |