org.apache.apex.malhar.lib.io.fs.AbstractFileInputOperatorFailureHandlingTest.java Source code

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.apex.malhar.lib.io.fs;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashSet;

import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;

import org.apache.apex.malhar.lib.testbench.CollectorTestSink;
import org.apache.apex.malhar.lib.util.TestUtils;
import org.apache.apex.malhar.lib.util.TestUtils.TestInfo;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.Path;

import com.google.common.collect.Sets;

import com.datatorrent.api.Attribute;
import com.datatorrent.api.DefaultOutputPort;

import static org.apache.apex.malhar.lib.helper.OperatorContextTestHelper.mockOperatorContext;

public class AbstractFileInputOperatorFailureHandlingTest {
    @Rule
    public TestInfo testMeta = new TestInfo();

    public static class TestFileInputOperator extends AbstractFileInputOperator<String> {
        public final transient DefaultOutputPort<String> output = new DefaultOutputPort<String>();
        private transient BufferedReader br = null;
        int count = 0;

        @Override
        protected InputStream openFile(Path path) throws IOException {
            InputStream is = super.openFile(path);
            br = new BufferedReader(new InputStreamReader(is));
            count = 0;
            return is;
        }

        @Override
        protected void closeFile(InputStream is) throws IOException {
            super.closeFile(is);
            br.close();
            count = 0;
            br = null;
        }

        @Override
        protected InputStream retryFailedFile(FailedFile ff) throws IOException {
            count = 0;
            return super.retryFailedFile(ff);
        }

        @Override
        protected String readEntity() throws IOException {
            if (count != 0 && (count % 4) == 0) {
                addToFailedList();
                return null;
            }
            return br.readLine();
        }

        @Override
        protected void emit(String tuple) {
            output.emit(tuple);
            count++;
        }
    }

    @Test
    public void testFailureHandling() throws Exception {
        FileContext.getLocalFSFileContext().delete(new Path(new File(testMeta.getDir()).getAbsolutePath()), true);
        HashSet<String> allLines = Sets.newHashSet();
        // Create files with 100 records.
        for (int file = 0; file < 10; file++) {
            HashSet<String> lines = Sets.newHashSet();
            for (int line = 0; line < 10; line++) {
                lines.add("f" + file + "l" + line);
            }
            allLines.addAll(lines);
            FileUtils.write(new File(testMeta.getDir(), "file" + file), StringUtils.join(lines, '\n'));
        }

        Thread.sleep(10);

        TestFileInputOperator oper = new TestFileInputOperator();

        CollectorTestSink<String> queryResults = new CollectorTestSink<String>();
        @SuppressWarnings({ "unchecked", "rawtypes" })
        CollectorTestSink<Object> sink = (CollectorTestSink) queryResults;
        oper.output.setSink(sink);

        oper.setDirectory(testMeta.getDir());
        oper.getScanner().setFilePatternRegexp(".*file[\\d]");

        oper.setup(mockOperatorContext(1, new Attribute.AttributeMap.DefaultAttributeMap()));
        for (long wid = 0; wid < 1000; wid++) {
            oper.beginWindow(wid);
            oper.emitTuples();
            oper.endWindow();
        }
        oper.teardown();

        Assert.assertEquals("number tuples", 100, queryResults.collectedTuples.size());
        Assert.assertEquals("lines", allLines, new HashSet<String>(queryResults.collectedTuples));
        TestUtils.deleteTargetTestClassFolder(testMeta.desc);

    }
}