TestGlobFileContextProvider.java

/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.pipeline.lib.io;

import com.google.common.collect.ImmutableSet;
import com.streamsets.pipeline.config.FileRollMode;
import com.streamsets.pipeline.config.PostProcessingOptions;
import org.junit.Assert;
import org.junit.Test;

import java.io.File;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.util.UUID;

public class TestGlobFileContextProvider {

  @Test
  public void testProvider() throws Exception {
    File testDir1 = new File("target", UUID.randomUUID().toString()).getAbsoluteFile();
    Assert.assertTrue(testDir1.mkdirs());
    File testDir2 = new File("target", UUID.randomUUID().toString()).getAbsoluteFile();
    Assert.assertTrue(testDir2.mkdirs());
    File file1 = new File(testDir1, "f1.txt");
    File file2 = new File(testDir2, "f2.txt");
    File file3 = new File(testDir1, "f3.txt");
    MultiFileInfo di1 = new MultiFileInfo("tag1", file1.getPath(), FileRollMode.REVERSE_COUNTER, "", "", "");
    MultiFileInfo di2 = new MultiFileInfo("tag2", file2.getPath(), FileRollMode.REVERSE_COUNTER, "", "", "");
    MultiFileInfo di3 = new MultiFileInfo("tag3", file3.getPath(), FileRollMode.REVERSE_COUNTER, "", "", "");

    FileEventPublisher eventPublisher = new FileEventPublisher() {
      @Override
      public void publish(FileEvent event) {
      }
    };

    GlobFileContextProvider provider = new GlobFileContextProvider(
        false,
        Arrays.asList(di1, di2, di3),
        1,
        StandardCharsets.UTF_8,
        1024,
        PostProcessingOptions.NONE,
        null,
        eventPublisher,
        false
    );

    // do full loop with no files
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertTrue(provider.didFullLoop());
    provider.getOffsets();


    // do full loop with one file
    Files.createFile(file1.toPath());
    Thread.sleep(2000);
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertFalse(provider.didFullLoop());
    Assert.assertEquals(di1, provider.next().getMultiFileInfo().getSource());
    Assert.assertTrue(provider.didFullLoop());
    provider.getOffsets();

    // do full loop with 3 files
    Files.createFile(file2.toPath());
    Files.createFile(file3.toPath());
    Thread.sleep(2000);
    Set<MultiFileInfo> expected = ImmutableSet.of(di1, di2, di3);
    Set<MultiFileInfo> got = new HashSet<>();
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertFalse(provider.didFullLoop());
    got.add(provider.next().getMultiFileInfo().getSource());
    Assert.assertFalse(provider.didFullLoop());
    got.add(provider.next().getMultiFileInfo().getSource());
    Assert.assertFalse(provider.didFullLoop());
    got.add(provider.next().getMultiFileInfo().getSource());
    Assert.assertTrue(provider.didFullLoop());
    Assert.assertEquals(expected, got);

    // test reset loop count
    provider.startNewLoop();
    Assert.assertFalse(provider.didFullLoop());
    provider.getOffsets();

    // do partial loop
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertFalse(provider.didFullLoop());
    provider.getOffsets();

    // do full loop continuing from partial loop
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertTrue(provider.didFullLoop());
    provider.getOffsets();

    Files.delete(file2.toPath());
    Files.delete(testDir2.toPath());

    // do full loop now with 2 files
    provider.setOffsets(new HashMap<String, String>());
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertFalse(provider.didFullLoop());
    provider.next().getMultiFileInfo().getSource();
    Assert.assertTrue(provider.didFullLoop());
    provider.getOffsets();

    provider.close();

  }
}