Examples with RollCycle net.openhft.chronicle.queue.RollCycle used on opensource projects

Example 1 with RollCycle

use of net.openhft.chronicle.queue.RollCycle in project Chronicle-Queue by OpenHFT.

the class ExcerptsSkippedWhenTailerDirectionNoneTest method shouldNotSkipMessageAtStartOfQueue.

@Test
public void shouldNotSkipMessageAtStartOfQueue() throws Exception {
    final File tmpDir = DirectoryUtils.tempDir(ExcerptsSkippedWhenTailerDirectionNoneTest.class.getSimpleName());
    try (final ChronicleQueue writeQueue = SingleChronicleQueueBuilder.binary(tmpDir).testBlockSize().rollCycle(TEST_DAILY).build()) {
        final ExcerptAppender excerptAppender = writeQueue.acquireAppender();
        try (final DocumentContext ctx = excerptAppender.writingDocument()) {
            ctx.wire().getValueOut().object("first");
        }
        try (final DocumentContext ctx = excerptAppender.writingDocument()) {
            ctx.wire().getValueOut().object("second");
        }
    }
    try (final SingleChronicleQueue readQueue = SingleChronicleQueueBuilder.binary(tmpDir).testBlockSize().rollCycle(TEST_DAILY).build()) {
        final ExcerptTailer tailer = readQueue.createTailer();
        final RollCycle rollCycle = readQueue.rollCycle();
        assertThat(rollCycle.toSequenceNumber(tailer.index()), is(0L));
        try (final DocumentContext ctx = tailer.direction(TailerDirection.NONE).readingDocument()) {
        // access the first document without incrementing sequence number
        }
        assertThat(rollCycle.toSequenceNumber(tailer.index()), is(0L));
        String value;
        try (DocumentContext dc = tailer.direction(TailerDirection.FORWARD).readingDocument()) {
            ValueIn valueIn = dc.wire().getValueIn();
            value = (String) valueIn.object();
        }
        assertThat(rollCycle.toSequenceNumber(tailer.index()), is(1L));
        assertThat(value, is("first"));
        try (DocumentContext dc = tailer.direction(TailerDirection.NONE).readingDocument()) {
            ValueIn valueIn = dc.wire().getValueIn();
            value = (String) valueIn.object();
        }
        assertThat(rollCycle.toSequenceNumber(tailer.index()), is(1L));
        assertThat(value, is("second"));
        try (DocumentContext dc = tailer.direction(TailerDirection.NONE).readingDocument()) {
            ValueIn valueIn = dc.wire().getValueIn();
            value = (String) valueIn.object();
        }
        assertThat(rollCycle.toSequenceNumber(tailer.index()), is(1L));
        assertThat(value, is("second"));
    }
}