/*
* 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.nutch.indexer;
import java.io.IOException;
import java.util.HashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.JobConf;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.plugin.Extension;
import org.apache.nutch.plugin.ExtensionPoint;
import org.apache.nutch.plugin.PluginRepository;
import org.apache.nutch.plugin.PluginRuntimeException;
import org.apache.nutch.util.ObjectCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Creates and caches {@link IndexWriter} implementing plugins. */
public class IndexWriters {
public final static Logger LOG = LoggerFactory
.getLogger(IndexWriters.class);
private IndexWriter[] indexWriters;
public IndexWriters(Configuration conf) {
ObjectCache objectCache = ObjectCache.get(conf);
synchronized (objectCache) {
this.indexWriters = (IndexWriter[]) objectCache
.getObject(IndexWriter.class.getName());
if (this.indexWriters == null) {
try {
ExtensionPoint point = PluginRepository.get(conf)
.getExtensionPoint(IndexWriter.X_POINT_ID);
if (point == null)
throw new RuntimeException(IndexWriter.X_POINT_ID
+ " not found.");
Extension[] extensions = point.getExtensions();
HashMap<String, IndexWriter> indexerMap = new HashMap<String, IndexWriter>();
for (int i = 0; i < extensions.length; i++) {
Extension extension = extensions[i];
IndexWriter writer = (IndexWriter) extension
.getExtensionInstance();
LOG.info("Adding " + writer.getClass().getName());
if (!indexerMap.containsKey(writer.getClass().getName())) {
indexerMap.put(writer.getClass().getName(), writer);
}
}
objectCache.setObject(IndexWriter.class.getName(), indexerMap
.values().toArray(new IndexWriter[0]));
} catch (PluginRuntimeException e) {
throw new RuntimeException(e);
}
this.indexWriters = (IndexWriter[]) objectCache
.getObject(IndexWriter.class.getName());
}
}
}
public void open(JobConf job, String name) throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].open(job, name);
} catch (IOException ioe) {
throw ioe;
}
}
}
public void write(NutchDocument doc) throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].write(doc);
} catch (IOException ioe) {
throw ioe;
}
}
}
public void update(NutchDocument doc) throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].update(doc);
} catch (IOException ioe) {
throw ioe;
}
}
}
public void delete(String key) throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].delete(key);
} catch (IOException ioe) {
throw ioe;
}
}
}
public void close() throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].close();
} catch (IOException ioe) {
throw ioe;
}
}
}
public void commit() throws IOException {
for (int i = 0; i < this.indexWriters.length; i++) {
try {
this.indexWriters[i].commit();
} catch (IOException ioe) {
throw ioe;
}
}
}
// lists the active IndexWriters and their configuration
public String describe() throws IOException {
StringBuffer buffer = new StringBuffer();
if (this.indexWriters.length == 0)
buffer.append("No IndexWriters activated - check your configuration\n");
else
buffer.append("Active IndexWriters :\n");
for (int i = 0; i < this.indexWriters.length; i++) {
buffer.append(this.indexWriters[i].describe()).append("\n");
}
return buffer.toString();
}
}