Examples with Reader com.twitter.distributedlog.LogRecordSet.Reader used on opensource projects

Example 1 with Reader

use of com.twitter.distributedlog.LogRecordSet.Reader in project distributedlog by twitter.

the class TestLogRecordSet method testWriteTooLongRecord.

@Test(timeout = 60000)
public void testWriteTooLongRecord() throws Exception {
    Writer writer = LogRecordSet.newWriter(1024, Type.NONE);
    assertEquals("zero user bytes", HEADER_LEN, writer.getNumBytes());
    assertEquals("zero records", 0, writer.getNumRecords());
    ByteBuffer dataBuf = ByteBuffer.allocate(MAX_LOGRECORD_SIZE + 1);
    try {
        writer.writeRecord(dataBuf, new Promise<DLSN>());
        fail("Should fail on writing large record");
    } catch (LogRecordTooLongException lrtle) {
    // expected
    }
    assertEquals("zero user bytes", HEADER_LEN, writer.getNumBytes());
    assertEquals("zero records", 0, writer.getNumRecords());
    ByteBuffer buffer = writer.getBuffer();
    assertEquals("zero user bytes", HEADER_LEN, buffer.remaining());
    byte[] data = new byte[buffer.remaining()];
    buffer.get(data);
    LogRecordWithDLSN record = new LogRecordWithDLSN(new DLSN(1L, 0L, 0L), 1L, data, 1L);
    record.setRecordSet();
    Reader reader = LogRecordSet.of(record);
    assertNull("Empty record set should return null", reader.nextRecord());
}

Example 2 with Reader

use of com.twitter.distributedlog.LogRecordSet.Reader in project distributedlog by twitter.

the class TestLogRecordSet method testEmptyRecordSet.

@Test(timeout = 60000)
public void testEmptyRecordSet() throws Exception {
    Writer writer = LogRecordSet.newWriter(1024, Type.NONE);
    assertEquals("zero user bytes", HEADER_LEN, writer.getNumBytes());
    assertEquals("zero records", 0, writer.getNumRecords());
    ByteBuffer buffer = writer.getBuffer();
    assertEquals("zero user bytes", HEADER_LEN, buffer.remaining());
    byte[] data = new byte[buffer.remaining()];
    buffer.get(data);
    LogRecordWithDLSN record = new LogRecordWithDLSN(new DLSN(1L, 0L, 0L), 1L, data, 1L);
    record.setRecordSet();
    Reader reader = LogRecordSet.of(record);
    assertNull("Empty record set should return null", reader.nextRecord());
}

Example 3 with Reader

use of com.twitter.distributedlog.LogRecordSet.Reader in project distributedlog by twitter.

the class TestLogRecordSet method testWriteRecords.

void testWriteRecords(Type codec) throws Exception {
    Writer writer = LogRecordSet.newWriter(1024, codec);
    assertEquals("zero user bytes", HEADER_LEN, writer.getNumBytes());
    assertEquals("zero records", 0, writer.getNumRecords());
    List<Future<DLSN>> writePromiseList = Lists.newArrayList();
    /// write first 5 records
    for (int i = 0; i < 5; i++) {
        ByteBuffer record = ByteBuffer.wrap(("record-" + i).getBytes(UTF_8));
        Promise<DLSN> writePromise = new Promise<DLSN>();
        writer.writeRecord(record, writePromise);
        writePromiseList.add(writePromise);
        assertEquals((i + 1) + " records", (i + 1), writer.getNumRecords());
    }
    ByteBuffer dataBuf = ByteBuffer.allocate(MAX_LOGRECORD_SIZE + 1);
    try {
        writer.writeRecord(dataBuf, new Promise<DLSN>());
        fail("Should fail on writing large record");
    } catch (LogRecordTooLongException lrtle) {
    // expected
    }
    assertEquals("5 records", 5, writer.getNumRecords());
    /// write another 5 records
    for (int i = 0; i < 5; i++) {
        ByteBuffer record = ByteBuffer.wrap(("record-" + (i + 5)).getBytes(UTF_8));
        Promise<DLSN> writePromise = new Promise<DLSN>();
        writer.writeRecord(record, writePromise);
        writePromiseList.add(writePromise);
        assertEquals((i + 6) + " records", (i + 6), writer.getNumRecords());
    }
    ByteBuffer buffer = writer.getBuffer();
    assertEquals("10 records", 10, writer.getNumRecords());
    // Test transmit complete
    writer.completeTransmit(1L, 1L, 10L);
    List<DLSN> writeResults = Await.result(Future.collect(writePromiseList));
    for (int i = 0; i < 10; i++) {
        assertEquals(new DLSN(1L, 1L, 10L + i), writeResults.get(i));
    }
    // Test reading from buffer
    byte[] data = new byte[buffer.remaining()];
    buffer.get(data);
    LogRecordWithDLSN record = new LogRecordWithDLSN(new DLSN(1L, 1L, 10L), 99L, data, 999L);
    record.setPositionWithinLogSegment(888);
    record.setRecordSet();
    Reader reader = LogRecordSet.of(record);
    LogRecordWithDLSN readRecord = reader.nextRecord();
    int numReads = 0;
    while (null != readRecord) {
        assertEquals(new DLSN(1L, 1L, 10L + numReads), readRecord.getDlsn());
        assertEquals(99L, readRecord.getTransactionId());
        assertEquals(888 + numReads, readRecord.getPositionWithinLogSegment());
        assertEquals(999L, readRecord.getStartSequenceIdOfCurrentSegment());
        assertEquals(999L + 888 + numReads - 1, readRecord.getSequenceId());
        // read next
        ++numReads;
        readRecord = reader.nextRecord();
    }
    assertEquals(10, numReads);
}