Examples with PhysicalFlushableChecksumChannel org.neo4j.io.fs.PhysicalFlushableChecksumChannel used on opensource projects

Example 6 with PhysicalFlushableChecksumChannel

use of org.neo4j.io.fs.PhysicalFlushableChecksumChannel in project neo4j by neo4j.

the class PhysicalFlushableChecksumChannelTest method calculateChecksum.

@Test
void calculateChecksum() throws IOException {
    final Path firstFile = directory.homePath().resolve("file1");
    StoreChannel storeChannel = fileSystem.write(firstFile);
    int channelChecksum;
    try (PhysicalFlushableChecksumChannel channel = new PhysicalFlushableChecksumChannel(storeChannel, new HeapScopedBuffer(100, INSTANCE))) {
        channel.beginChecksum();
        channel.put((byte) 10);
        channelChecksum = channel.putChecksum();
    }
    int fileSize = (int) fileSystem.getFileSize(firstFile);
    assertEquals(Byte.BYTES + Integer.BYTES, fileSize);
    byte[] writtenBytes = new byte[fileSize];
    try (InputStream in = Files.newInputStream(firstFile)) {
        in.read(writtenBytes);
    }
    ByteBuffer buffer = ByteBuffer.wrap(writtenBytes);
    Checksum checksum = CHECKSUM_FACTORY.get();
    checksum.update(10);
    assertEquals(checksum.getValue(), channelChecksum);
    assertEquals(10, buffer.get());
    assertEquals(checksum.getValue(), buffer.getInt());
}