Examples with ReadableLogChannel org.neo4j.kernel.impl.transaction.log.ReadableLogChannel used on opensource projects

Example 11 with ReadableLogChannel

use of org.neo4j.kernel.impl.transaction.log.ReadableLogChannel in project neo4j by neo4j.

the class LogTestUtils method filterNeostoreLogicalLog.

public static File filterNeostoreLogicalLog(FileSystemAbstraction fileSystem, File file, final LogHook<LogEntry> filter) throws IOException {
    filter.file(file);
    File tempFile = new File(file.getAbsolutePath() + ".tmp");
    fileSystem.deleteFile(tempFile);
    try (StoreChannel in = fileSystem.open(file, "r");
        StoreChannel out = fileSystem.open(tempFile, "rw")) {
        LogHeader logHeader = transferLogicalLogHeader(in, out, ByteBuffer.allocate(LOG_HEADER_SIZE));
        PhysicalLogVersionedStoreChannel outChannel = new PhysicalLogVersionedStoreChannel(out, logHeader.logVersion, logHeader.logFormatVersion);
        PhysicalLogVersionedStoreChannel inChannel = new PhysicalLogVersionedStoreChannel(in, logHeader.logVersion, logHeader.logFormatVersion);
        ReadableLogChannel inBuffer = new ReadAheadLogChannel(inChannel, LogVersionBridge.NO_MORE_CHANNELS);
        LogEntryReader<ReadableLogChannel> entryReader = new VersionAwareLogEntryReader<>();
        LogEntry entry;
        while ((entry = entryReader.readLogEntry(inBuffer)) != null) {
            if (filter.test(entry)) {
            // TODO allright, write to outBuffer
            }
        }
    }
    return tempFile;
}

Example 12 with ReadableLogChannel

use of org.neo4j.kernel.impl.transaction.log.ReadableLogChannel in project neo4j by neo4j.

the class LegacyLogEntryReaderTest method shouldReadTheEntries.

@Test
public void shouldReadTheEntries() throws IOException {
    // given
    final LogEntry start = new LogEntryStart(0, 1, 2, 3, EMPTY_ADDITIONAL_ARRAY, UNSPECIFIED);
    NodeRecord record = new NodeRecord(42);
    final LogEntry command = new LogEntryCommand(new Command.NodeCommand(record, record));
    final LogEntry commit = new OnePhaseCommit(42, 43);
    final LogEntryReader<ReadableLogChannel> logEntryReader = mock(LogEntryReader.class);
    when(logEntryReader.readLogEntry(any(ReadableLogChannel.class))).thenReturn(new IdentifiableLogEntry(start, 1), new IdentifiableLogEntry(command, 1), new IdentifiableLogEntry(commit, 1), null);
    final LegacyLogEntryReader reader = new LegacyLogEntryReader(fs, from -> logEntryReader);
    // when
    final IOCursor<LogEntry> cursor = reader.openReadableChannel(input).other();
    // then
    assertTrue(cursor.next());
    assertEquals(start, cursor.get());
    assertTrue(cursor.next());
    assertEquals(command, cursor.get());
    assertTrue(cursor.next());
    assertEquals(commit, cursor.get());
    assertFalse(cursor.next());
    cursor.close();
}