Examples of org.apache.cassandra.db.DecoratedKey

org.apache.cassandra.db.DecoratedKey
Represents a decorated key, handy for certain operations where just working with strings gets slow. We do a lot of sorting of DecoratedKeys, so for speed, we assume that tokens correspond one-to-one with keys. This is not quite correct in the case of RandomPartitioner (which uses MD5 to hash keys to tokens); if this matters, you can subclass RP to use a stronger hash, or use a non-lossy tokenization scheme (as in the OrderPreservingPartitioner classes).

            try
            {
                while (!input.isEOF())
                {
                    // read key & data position from index entry
                    DecoratedKey indexDecoratedKey = decodeKey(partitioner, descriptor, FBUtilities.readShortByteArray(input));
                    long dataPosition = input.readLong();


                    int comparison = indexDecoratedKey.compareTo(decoratedKey);
                    int v = op.apply(comparison);
                    if (v == 0)
                    {
                        if (comparison == 0 && keyCache != null && keyCache.getCapacity() > 0)
                        {

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    public static void enumeratekeys(String ssTableFile, PrintStream outs)
    throws IOException
    {
        Descriptor desc = Descriptor.fromFilename(ssTableFile);
        KeyIterator iter = new KeyIterator(desc);
        DecoratedKey lastKey = null;
        while (iter.hasNext())
        {
            DecoratedKey key = iter.next();


            // validate order of the keys in the sstable
            if (lastKey != null && lastKey.compareTo(key) > 0 )
                throw new IOException("Key out of order! " + lastKey + " > " + key);
            lastKey = key;

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            excludeSet = new HashSet<String>(Arrays.asList(excludes));
        
        outs.println("{");


        // last key to compare order 
        DecoratedKey lastKey = null;
        
        for (String key : keys)
        {
            if (excludeSet.contains(key))
                continue;
            DecoratedKey<?> dk = partitioner.decorateKey(ByteBuffer.wrap(hexToBytes(key)));


            // validate order of the keys in the sstable
            if (lastKey != null && lastKey.compareTo(dk) > 0 )
                throw new IOException("Key out of order! " + lastKey + " > " + dk);
            lastKey = dk;


            scanner.seekTo(dk);

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            SSTableReader reader = SSTableReader.open(getDescriptor(version));
            for (String keystring : TEST_DATA)
            {
                ByteBuffer key = ByteBuffer.wrap(keystring.getBytes());
                // confirm that the bloom filter does not reject any keys/names
                DecoratedKey dk = reader.partitioner.decorateKey(key);
                SSTableNamesIterator iter = new SSTableNamesIterator(reader, dk, FBUtilities.singleton(key));
                assert iter.next().name().equals(key);
            }
        }
        catch (Throwable e)

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        if (file == null)
            return;


        try
        {
            DecoratedKey keyInDisk = SSTableReader.decodeKey(sstable.partitioner,
                                                             sstable.descriptor,
                                                             ByteBufferUtil.readWithShortLength(file));
            assert keyInDisk.equals(key) : String.format("%s != %s in %s", keyInDisk, key, file.getPath());
            SSTableReader.readRowSize(file, sstable.descriptor);
            read(sstable, file);
        }
        catch (IOException e)
        {

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            // build the index and filter
            long rows = 0;
            try
            {
                DecoratedKey key;
                long rowPosition = 0;
                while (rowPosition < dfile.length())
                {
                    key = SSTableReader.decodeKey(StorageService.getPartitioner(), desc, ByteBufferUtil.readWithShortLength(dfile));
                    iwriter.afterAppend(key, rowPosition);

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                int numkeys = keys.size();
                Random random = new Random();
                // sample the column family using random keys from the index 
                while (true)
                {
                    DecoratedKey dk = keys.get(random.nextInt(numkeys));
                    if (!tree.split(dk.token))
                        break;
                }
            }
            logger.debug("Prepared AEService tree of size " + tree.size() + " for " + request);

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    public static final LongToken MINIMUM = new LongToken(Long.MIN_VALUE);
    public static final long MAXIMUM = Long.MAX_VALUE;


    public DecoratedKey decorateKey(ByteBuffer key)
    {
        return new DecoratedKey(getToken(key), key);
    }

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        int columns = 10;


        // Adds enough data to trigger multiple sstable per level
        for (int r = 0; r < rows; r++)
        {
            DecoratedKey key = Util.dk(String.valueOf(r));
            RowMutation rm = new RowMutation(ksname, key.key);
            for (int c = 0; c < columns; c++)
            {
                rm.add(new QueryPath(cfname, null, ByteBufferUtil.bytes("column" + c)), value, 0);
            }

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                int numkeys = keys.size();
                Random random = new Random();
                // sample the column family using random keys from the index 
                while (true)
                {
                    DecoratedKey dk = keys.get(random.nextInt(numkeys));
                    if (!tree.split(dk.token))
                        break;
                }
            }
            logger.debug("Prepared AEService tree of size " + tree.size() + " for " + cf);

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