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

Example 91 with StoreChannel

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

the class PhysicalFlushableChannelTest method readFile.

private ByteBuffer readFile(File file) throws IOException {
    try (StoreChannel channel = fileSystemRule.get().open(file, "r")) {
        ByteBuffer buffer = ByteBuffer.allocate((int) channel.size());
        channel.read(buffer);
        buffer.flip();
        return buffer;
    }
}

Example 92 with StoreChannel

use of org.neo4j.io.fs.StoreChannel 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 93 with StoreChannel

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

the class LogTestUtils method copyLogicalLog.

public static NonCleanLogCopy copyLogicalLog(FileSystemAbstraction fileSystem, File logBaseFileName) throws IOException {
    char active = '1';
    File activeLog = new File(logBaseFileName.getPath() + ".active");
    ByteBuffer buffer = ByteBuffer.allocate(1024);
    File activeLogBackup;
    try (StoreChannel af = fileSystem.open(activeLog, "r")) {
        af.read(buffer);
        buffer.flip();
        activeLogBackup = new File(logBaseFileName.getPath() + ".bak.active");
        try (StoreChannel activeCopy = fileSystem.open(activeLogBackup, "rw")) {
            activeCopy.write(buffer);
        }
    }
    buffer.flip();
    active = buffer.asCharBuffer().get();
    buffer.clear();
    File currentLog = new File(logBaseFileName.getPath() + "." + active);
    File currentLogBackup = new File(logBaseFileName.getPath() + ".bak." + active);
    try (StoreChannel source = fileSystem.open(currentLog, "r");
        StoreChannel dest = fileSystem.open(currentLogBackup, "rw")) {
        int read = -1;
        do {
            read = source.read(buffer);
            buffer.flip();
            dest.write(buffer);
            buffer.clear();
        } while (read == 1024);
    }
    return new NonCleanLogCopy(new FileBackup(activeLog, activeLogBackup, fileSystem), new FileBackup(currentLog, currentLogBackup, fileSystem));
}

Example 94 with StoreChannel

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

the class TestEphemeralFileChannel method absoluteVersusRelative.

@Test
public void absoluteVersusRelative() throws Exception {
    // GIVEN
    File file = new File("myfile");
    EphemeralFileSystemAbstraction fs = fileSystemRule.get();
    StoreChannel channel = fs.open(file, "rw");
    byte[] bytes = "test".getBytes();
    channel.write(ByteBuffer.wrap(bytes));
    channel.close();
    // WHEN
    channel = fs.open(new File(file.getAbsolutePath()), "r");
    byte[] readBytes = new byte[bytes.length];
    int nrOfReadBytes = channel.read(ByteBuffer.wrap(readBytes));
    // THEN
    assertEquals(bytes.length, nrOfReadBytes);
    assertTrue(Arrays.equals(bytes, readBytes));
    fs.close();
}

Example 95 with StoreChannel

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

the class FailureStorage method storeIndexFailure.

/**
     * Store failure in failure file for index with the given id
     *
     * @param failure message describing the failure that needs to be stored
     * @throws IOException if the failure could not be stored
     */
public synchronized void storeIndexFailure(String failure) throws IOException {
    File failureFile = failureFile();
    try (StoreChannel channel = fs.open(failureFile, "rw")) {
        byte[] existingData = new byte[(int) channel.size()];
        channel.read(ByteBuffer.wrap(existingData));
        channel.position(lengthOf(existingData));
        byte[] data = UTF8.encode(failure);
        channel.write(ByteBuffer.wrap(data, 0, Math.min(data.length, MAX_FAILURE_SIZE)));
        channel.force(true);
        channel.close();
    }
}