Example usage for java.util.concurrent ThreadLocalRandom nextInt

Introduction

In this page you can find the example usage for java.util.concurrent ThreadLocalRandom nextInt.

Prototype

public int nextInt() 

Source Link

Document

Returns a pseudorandom int value.

Usage

From source file:com.linkedin.pinot.integration.tests.UploadRefreshDeleteIntegrationTest.java

protected void generateAndUploadRandomSegment(String segmentName, int rowCount) throws Exception {
    ThreadLocalRandom random = ThreadLocalRandom.current();
    Schema schema = new Schema.Parser().parse(
            new File(TestUtils.getFileFromResourceUrl(getClass().getClassLoader().getResource("dummy.avsc"))));
    GenericRecord record = new GenericData.Record(schema);
    GenericDatumWriter<GenericRecord> datumWriter = new GenericDatumWriter<GenericRecord>(schema);
    DataFileWriter<GenericRecord> fileWriter = new DataFileWriter<GenericRecord>(datumWriter);
    File avroFile = new File(_tmpDir, segmentName + ".avro");
    fileWriter.create(schema, avroFile);

    for (int i = 0; i < rowCount; i++) {
        record.put(0, random.nextInt());
        fileWriter.append(record);/*ww w.  jav a2s.  c  o  m*/
    }

    fileWriter.close();

    int segmentIndex = Integer.parseInt(segmentName.split("_")[1]);

    File segmentTarDir = new File(_tarsDir, segmentName);
    ensureDirectoryExistsAndIsEmpty(segmentTarDir);
    ExecutorService executor = MoreExecutors.sameThreadExecutor();
    buildSegmentsFromAvro(Collections.singletonList(avroFile), executor, segmentIndex,
            new File(_segmentsDir, segmentName), segmentTarDir, "mytable", false, null);
    executor.shutdown();
    executor.awaitTermination(1L, TimeUnit.MINUTES);

    for (String segmentFileName : segmentTarDir.list()) {
        File file = new File(segmentTarDir, segmentFileName);
        FileUploadUtils.sendFile("localhost", "8998", "segments", segmentFileName, new FileInputStream(file),
                file.length(), FileUploadUtils.SendFileMethod.POST);
    }

    avroFile.delete();
    FileUtils.deleteQuietly(segmentTarDir);
}

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From source file:org.neo4j.io.pagecache.PageCacheTest.java

@Test(timeout = SEMI_LONG_TIMEOUT_MILLIS)
public void freshlyCreatedPagesMustContainAllZeros() throws IOException {
    ThreadLocalRandom rng = ThreadLocalRandom.current();

    getPageCache(fs, maxPages, pageCachePageSize, PageCacheTracer.NULL);

    try (PagedFile pagedFile = pageCache.map(existingFile("a"), filePageSize);
            PageCursor cursor = pagedFile.io(0, PF_SHARED_WRITE_LOCK)) {
        for (int i = 0; i < 100; i++) {
            assertTrue(cursor.next());/*w w w  .  j a v a 2  s . com*/
            for (int j = 0; j < filePageSize; j++) {
                cursor.putByte((byte) rng.nextInt());
            }
        }
    }
    pageCache.close();
    pageCache = null;
    System.gc(); // make sure underlying pages are finalizable
    System.gc(); // make sure underlying pages are finally collected

    getPageCache(fs, maxPages, pageCachePageSize, PageCacheTracer.NULL);

    try (PagedFile pagedFile = pageCache.map(existingFile("b"), filePageSize);
            PageCursor cursor = pagedFile.io(0, PF_SHARED_WRITE_LOCK)) {
        for (int i = 0; i < 100; i++) {
            assertTrue(cursor.next());
            for (int j = 0; j < filePageSize; j++) {
                assertThat(cursor.getByte(), is((byte) 0));
            }
        }
    }
}

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