com.marklogic.contentpump.TransformOutputFormat Maven / Gradle / Ivy
/*
* Copyright (c) 2019 MarkLogic Corporation
*
* Licensed 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 com.marklogic.contentpump;
import java.io.IOException;
import java.util.Map;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.DefaultStringifier;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import com.marklogic.mapreduce.ContentOutputFormat;
import com.marklogic.mapreduce.DocumentURI;
import com.marklogic.mapreduce.LinkedMapWritable;
import com.marklogic.mapreduce.utilities.InternalUtilities;
import com.marklogic.xcc.AdhocQuery;
import com.marklogic.xcc.ContentSource;
import com.marklogic.xcc.RequestOptions;
import com.marklogic.xcc.ResultSequence;
import com.marklogic.xcc.Session;
import com.marklogic.xcc.exceptions.ServerConnectionException;
/**
* OutputFormat for content of transformation. Use this class to transform the
* content on server-side and store results in a MarkLogic Server database.
*
* @author ali
*
* @param
*/
public class TransformOutputFormat extends
ContentOutputFormat {
static final String MIMETYPES_QUERY =
"import module namespace hadoop = "
+ "\"http://marklogic.com/xdmp/hadoop\" at \"/MarkLogic/hadoop.xqy\";\n"
+ "let $f := "
+ " fn:function-lookup(xs:QName('hadoop:get-mimetypes-map'),0)\n"
+ "let $hasFunc := exists($f)"
+ "return if($hasFunc eq fn:true()) then "
+ "$f()\n" + "else ()";
/**
* internal mimetypes map, initialized in getRecordWriter
*/
public static LinkedMapWritable mimetypeMap = null;
/**
* initialize mimetype map if not initialized, return the map
*
* @return
* @throws IOException
*/
private LinkedMapWritable getMimetypesMap() throws IOException {
if (mimetypeMap != null)
return mimetypeMap;
String mtmap = conf.get(ConfigConstants.CONF_MIMETYPES);
if (mtmap != null) {
mimetypeMap = DefaultStringifier.load(conf,
ConfigConstants.CONF_MIMETYPES, LinkedMapWritable.class);
return mimetypeMap;
}
String[] hosts = conf.getStrings(OUTPUT_HOST);
Session session = null;
ResultSequence result = null;
for (int i = 0; i < hosts.length; i++) {
try {
String host = hosts[i];
ContentSource cs = InternalUtilities.getOutputContentSource(conf,
host);
session = cs.newSession();
AdhocQuery query = session.newAdhocQuery(MIMETYPES_QUERY);
RequestOptions options = new RequestOptions();
options.setDefaultXQueryVersion("1.0-ml");
query.setOptions(options);
result = session.submitRequest(query);
if (!result.hasNext())
throw new IOException(
"Server-side transform requires MarkLogic 7 or later");
mimetypeMap = new LinkedMapWritable();
while (result.hasNext()) {
String suffs = result.next().asString();
Text format = new Text(result.next().asString());
// some extensions are in a space separated string
for (String s : suffs.split(" ")) {
Text suff = new Text(s);
mimetypeMap.put(suff, format);
}
}
return mimetypeMap;
} catch (Exception e) {
if (e.getCause() instanceof ServerConnectionException) {
LOG.warn("Unable to connect to " + hosts[i]
+ " to query destination information");
continue;
}
LOG.error(e.getMessage(), e);
throw new IOException(e);
} finally {
if (result != null) {
result.close();
}
if (session != null) {
session.close();
}
}
}
return null;
}
@Override
public RecordWriter getRecordWriter(
TaskAttemptContext context) throws IOException, InterruptedException {
Configuration conf = context.getConfiguration();
fastLoad = Boolean.valueOf(conf.get(OUTPUT_FAST_LOAD));
Map sourceMap = getSourceMap(fastLoad, context);
getMimetypesMap();
// construct the ContentWriter
return new TransformWriter(conf, sourceMap, fastLoad, am);
}
@Override
public void checkOutputSpecs(Configuration conf, ContentSource cs)
throws IOException {
super.checkOutputSpecs(conf, cs);
// store mimetypes map into config system
DefaultStringifier.store(conf, getMimetypesMap(),
ConfigConstants.CONF_MIMETYPES);
}
}