Java Code Examples for net.openhft.chronicle.wire.Wire#bytes()

private void removeEOF(Path path) throws IOException {
    long blockSize = 64 << 10;
    long chunkSize = OS.pageAlign(blockSize);
    long overlapSize = OS.pageAlign(blockSize / 4);
    final MappedBytes mappedBytes = MappedBytes.mappedBytes(path.toFile(), chunkSize, overlapSize, false);
    mappedBytes.reserve(test);
    try {
        final Wire wire = WireType.BINARY_LIGHT.apply(mappedBytes);
        final Bytes<?> bytes = wire.bytes();
        bytes.readLimitToCapacity();
        bytes.readSkip(4);
        // move past header
        try (final SingleChronicleQueueStore qs = loadStore(wire)) {
            assertNotNull(qs);
            long l = qs.writePosition();
            long len = Wires.lengthOf(bytes.readVolatileInt(l));
            long eofOffset = l + len + 4L;
            bytes.writePosition(eofOffset);
            bytes.writeInt(0);
        }
    } finally {
        mappedBytes.release(test);
    }
}
 

private static void runInner(Histogram transportTime, Histogram readTime, ExcerptTailer tailer) {
    Jvm.safepoint();
    if (tailer.peekDocument()) {
        if (counter++ < 1000) {
            Jvm.safepoint();
            return;
        }
    }
    if (counter > 0)
        Jvm.safepoint();
    else
        Jvm.safepoint();
    counter = 0;
    try (DocumentContext dc = tailer.readingDocument(false)) {
        Jvm.safepoint();
        if (!dc.isPresent()) {
            return;
        }
        long transport = System.nanoTime();
        Jvm.safepoint();
        Wire wire = dc.wire();
        Bytes<?> bytes = wire.bytes();
        long start = readMessage(bytes);
        long end = System.nanoTime();
        transportTime.sample(transport - start);
        readTime.sample(end - transport);
    }
    Jvm.safepoint();
}
 

private static void writeMessage(Wire wire, int messageSize) {
    Bytes<?> bytes = wire.bytes();
    long wp = bytes.writePosition();
    long addr = bytes.addressForWrite(wp);
    Memory memory = OS.memory();
    for (int i = 0; i < messageSize; i += 16) {
        memory.writeLong(addr + i, 0L);
        memory.writeLong(addr + i + 8, 0L);
    }

    bytes.writeSkip(messageSize);
    bytes.writeLong(wp, System.nanoTime());
}
 

/**
 * the following steps
 * <p>
 * (1) write to a queue
 * (2) force and end for file marker
 * (3) write to the queue again, this will cause it to be written to tomorrows .cq4 file
 * (4) delete todays queue files, that was created in step (1)
 * (5) create a new instance of chronicle queue ( same directory ) as step 1
 * (6) create a tailer toEnd
 * (6) write to this queue created in (5)
 * (7) when you now try to read from this queue you will not be able to read back what you have just written in (6)
 */
@Test
public void test() {
    File tmpDir = getTmpDir();
    File[] files;
    try (ChronicleQueue writeQ = ChronicleQueue.singleBuilder(tmpDir).build()) {
        ExcerptAppender appender = writeQ.acquireAppender();
        long wp;
        Wire wire;

        try (DocumentContext dc = appender.writingDocument()) {
            wire = dc.wire();
            wire.write().text("hello world");
            Bytes<?> bytes = wire.bytes();
            wp = bytes.writePosition();
        }

        File dir = new File(appender.queue().fileAbsolutePath());
        files = dir.listFiles(pathname -> pathname.getAbsolutePath().endsWith(".cq4"));

        wire.bytes().writeInt(wp, Wires.END_OF_DATA);
        appender.writeText("hello world  2");
    }

    Assert.assertEquals(files.length, 1);
    File file = files[0];
    file.delete();

    try (ChronicleQueue q = ChronicleQueue.singleBuilder(tmpDir).build()) {
        ExcerptTailer excerptTailer = q.createTailer().toEnd();
        q.acquireAppender()
                .writeText(EXPECTED);
        Assert.assertEquals(EXPECTED, excerptTailer.readText());
    }
}
 

static void addToEndOfCache(Wire wire2) {
    Bytes<?> bytes = wire2.bytes();
    long addr = bytes.addressForWrite(bytes.writePosition());
    int pad = (int) (64 - (addr & 63));
    if (pad < 64)
        wire2.addPadding(pad);
}