/*
* 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 java.net.MalformedURLException;
import java.net.URL;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.scaleunlimited.cascading.NullContext;
import bixo.config.BixoPlatform;
import bixo.datum.UrlDatum;
import bixo.hadoop.ImportCounters;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Function;
import cascading.operation.FunctionCall;
// TODO KKr - combine/resolve delta with UrlImporter
@SuppressWarnings("serial")
public class LoadUrlsFunction extends BaseOperation<NullContext> implements Function<NullContext> {
private static final Logger LOGGER = LoggerFactory.getLogger(LoadUrlsFunction.class);
private int _maxUrls;
private int _numUrls;
public LoadUrlsFunction(int maxUrls) {
super(UrlDatum.FIELDS);
_maxUrls = maxUrls;
_numUrls = 0;
}
public LoadUrlsFunction() {
this(Integer.MAX_VALUE);
}
@SuppressWarnings("rawtypes")
@Override
public void operate(FlowProcess process, FunctionCall<NullContext> funcCall) {
if (_numUrls >= _maxUrls) {
process.increment(ImportCounters.URLS_FILTERED, 1);
return;
}
String url = funcCall.getArguments().getString("line").trim();
if ((url.length() == 0) || (url.startsWith("#"))) {
return;
}
try {
// Validate the URL
new URL(url);
UrlDatum urlDatum = new UrlDatum(url);
funcCall.getOutputCollector().add(BixoPlatform.clone(urlDatum.getTuple(), process));
_numUrls += 1;
process.increment(ImportCounters.URLS_ACCEPTED, 1);
} catch (MalformedURLException e) {
LOGGER.warn("Invalid URL in input data file: " + url);
process.increment(ImportCounters.URLS_REJECTED, 1);
}
}
}