/*
* Copyright 2009-2013 Scale Unlimited
*
* 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 bixo.operations;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.scaleunlimited.cascading.NullContext;
import bixo.config.BixoPlatform;
import bixo.datum.GroupedUrlDatum;
import bixo.datum.UrlDatum;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Function;
import cascading.operation.FunctionCall;
@SuppressWarnings({ "serial", "rawtypes" })
public class GroupFunction extends BaseOperation<NullContext> implements Function<NullContext> {
private static final Logger LOGGER = LoggerFactory.getLogger(GroupFunction.class);
private final BaseGroupGenerator _generator;
public GroupFunction(BaseGroupGenerator generator) {
super(GroupedUrlDatum.FIELDS);
_generator = generator;
}
@Override
public void operate(FlowProcess process, FunctionCall<NullContext> funCall) {
String key;
try {
UrlDatum datum = new UrlDatum(funCall.getArguments());
key = _generator.getGroupingKey(datum);
GroupedUrlDatum result = new GroupedUrlDatum(datum, key);
funCall.getOutputCollector().add(BixoPlatform.clone(result.getTuple(), process));
} catch (Exception e) {
// TODO KKr - don't lose the tuple (skipping support)
LOGGER.error("Unexpected exception while grouping URL (probably badly formed)", e);
}
}
}