/**
* Copyright 2012 LiveRamp
*
* 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.liveramp.cascading_ext.counters;
import cascading.flow.Flow;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Filter;
import cascading.operation.FilterCall;
import cascading.pipe.Each;
import cascading.pipe.Pipe;
import cascading.scheme.hadoop.TextLine;
import cascading.tap.SinkMode;
import cascading.tap.Tap;
import cascading.tap.hadoop.Hfs;
import com.liveramp.cascading_ext.BaseTestCase;
import com.liveramp.cascading_ext.CascadingUtil;
import com.liveramp.cascading_ext.FileSystemHelper;
import org.apache.hadoop.fs.Path;
import org.junit.Test;
import java.io.IOException;
import static org.junit.Assert.*;
/**
* @author eddie
*/
public class TestCounters extends BaseTestCase {
@Test
public void testBlackHoleWarning() throws IOException {
FileSystemHelper.safeMkdirs(FileSystemHelper.getFS(), new Path(getTestRoot() + "/input"));
Tap input = new Hfs(new TextLine(), getTestRoot() + "/input");
Tap output = new Hfs(new TextLine(), getTestRoot() + "/output", SinkMode.REPLACE);
Pipe removeAll = new Pipe("remove all");
removeAll = new Each(removeAll, new RemoveAll());
Flow flow = CascadingUtil.get().getFlowConnector().connect(input, output, removeAll);
flow.complete();
assertTrue("no warning on empty input", !Counters.prettyCountersString(flow).contains("BLACK HOLE WARNING"));
FileSystemHelper.createFile(FileSystemHelper.getFS(), getTestRoot() + "/input/important_messages", "hi vlad");
flow = CascadingUtil.get().getFlowConnector().connect(input, output, removeAll);
flow.complete();
assertTrue("warning on empty output and nonempty input", Counters.prettyCountersString(flow).contains("BLACK HOLE WARNING"));
flow = CascadingUtil.get().getFlowConnector().connect(input, output, new Pipe("identity"));
flow.complete();
assertTrue("no warning on nonempty output", !Counters.prettyCountersString(flow).contains("BLACK HOLE WARNING"));
}
@SuppressWarnings({"rawtypes", "serial"})
private static class RemoveAll extends BaseOperation implements Filter {
public boolean isRemove(FlowProcess arg0, FilterCall arg1) {
return true;
}
}
}