/*
* Copyright 2008-2009 LinkedIn, Inc
*
* 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 voldemort.store.readonly.mr;
import java.util.Map;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.mapred.JobConf;
import voldemort.serialization.json.JsonTypeSerializer;
import voldemort.store.readonly.mr.azkaban.StoreBuilderTransformation;
import voldemort.store.readonly.mr.utils.HadoopUtils;
import azkaban.common.utils.Props;
import azkaban.common.utils.Utils;
public class VoldemortStoreBuilderMapper extends AbstractHadoopStoreBuilderMapper<Object, Object> {
private String _keySelection;
private String _valSelection;
private JsonTypeSerializer _inputKeySerializer;
private JsonTypeSerializer _inputValueSerializer;
private StoreBuilderTransformation _keyTrans;
private StoreBuilderTransformation _valTrans;
@Override
public Object makeKey(Object key, Object value) {
return makeResult((BytesWritable) key, _inputKeySerializer, _keySelection, _keyTrans);
}
@Override
public Object makeValue(Object key, Object value) {
return makeResult((BytesWritable) value, _inputValueSerializer, _valSelection, _valTrans);
}
private Object makeResult(BytesWritable writable,
JsonTypeSerializer serializer,
String selection,
StoreBuilderTransformation trans) {
Object obj = serializer.toObject(writable.get());
if(selection != null) {
Map m = (Map) obj;
obj = m.get(selection);
}
if(trans != null)
obj = trans.transform(obj);
return obj;
}
@Override
public void configure(JobConf conf) {
super.configure(conf);
Props props = HadoopUtils.getPropsFromJob(conf);
_keySelection = props.getString("key.selection", null);
_valSelection = props.getString("value.selection", null);
_inputKeySerializer = getSchemaFromJob(conf, "mapper.input.key.schema");
_inputValueSerializer = getSchemaFromJob(conf, "mapper.input.value.schema");
String _keyTransClass = props.getString("key.transformation.class", null);
String _valueTransClass = props.getString("value.transformation.class", null);
if(_keyTransClass != null)
_keyTrans = (StoreBuilderTransformation) Utils.callConstructor(_keyTransClass);
if(_valueTransClass != null)
_valTrans = (StoreBuilderTransformation) Utils.callConstructor(_valueTransClass);
}
protected JsonTypeSerializer getSchemaFromJob(JobConf conf, String key) {
if(conf.get(key) == null)
throw new IllegalArgumentException("Missing required parameter '" + key + "' on job.");
return new JsonTypeSerializer(conf.get(key));
}
}