Package org.iq80.leveldb

Examples of org.iq80.leveldb.DB

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    DbIterator internalIterator()
    {
        mutex.lock();
        try {
            // merge together the memTable, immutableMemTable, and tables in version set
            MemTableIterator iterator = null;
            if (immutableMemTable != null) {
                iterator = immutableMemTable.iterator();
            }
            Version current = versions.getCurrent();
            return new DbIterator(memTable.iterator(), iterator, current.getLevel0Files(), current.getLevelIterators(), internalKeyComparator);
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    {
        Slice record = Slices.allocate(SIZE_OF_LONG + SIZE_OF_INT + updates.getApproximateSize());
        final SliceOutput sliceOutput = record.output();
        sliceOutput.writeLong(sequenceBegin);
        sliceOutput.writeInt(updates.size());
        updates.forEach(new Handler()
        {
            @Override
            public void put(Slice key, Slice value)
            {
                sliceOutput.writeByte(VALUE.getPersistentId());
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    }

    private BlockIterator getNextBlock()
    {
        Slice blockHandle = blockIterator.next().getValue();
        Block dataBlock = table.openBlock(blockHandle);
        return dataBlock.iterator();
    }
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            fileChannel = new FileInputStream(tableFile).getChannel();
            try {
                if( Iq80DBFactory.USE_MMAP ) {
                    table = new MMapTable(tableFile.getAbsolutePath(), fileChannel, userComparator, verifyChecksums);
                } else {
                    table = new FileChannelTable(tableFile.getAbsolutePath(), fileChannel, userComparator, verifyChecksums);
                }
            }
            catch (IOException e) {
                Closeables.closeQuietly(fileChannel);
                throw e;
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            String tableFileName = Filename.tableFileName(fileNumber);
            File tableFile = new File(databaseDir, tableFileName);
            fileChannel = new FileInputStream(tableFile).getChannel();
            try {
                if( Iq80DBFactory.USE_MMAP ) {
                    table = new MMapTable(tableFile.getAbsolutePath(), fileChannel, userComparator, verifyChecksums);
                } else {
                    table = new FileChannelTable(tableFile.getAbsolutePath(), fileChannel, userComparator, verifyChecksums);
                }
            }
            catch (IOException e) {
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        cache = CacheBuilder.newBuilder()
                .maximumSize(tableCacheSize)
                .removalListener(new RemovalListener<Long, TableAndFile>() {
                    public void onRemoval(RemovalNotification<Long, TableAndFile> notification) {
                        Table table = notification.getValue().getTable();
                        finalizer.addCleanup(table, table.closer());
                    }
                })
                .build(new CacheLoader<Long, TableAndFile>() {
                    public TableAndFile load(Long fileNumber)
                            throws IOException {
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        return getTable(file.getNumber()).getApproximateOffsetOf(key);
    }

    private Table getTable(long number)
    {
        Table table;
        try {
            table = cache.get(number).getTable();
        }
        catch (ExecutionException e) {
            Throwable cause = e;
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    public boolean someFileOverlapsRange(Slice smallestUserKey, Slice largestUserKey)
    {
        InternalKey smallestInternalKey = new InternalKey(smallestUserKey, MAX_SEQUENCE_NUMBER, VALUE);
        int index = findFile(smallestInternalKey);

        UserComparator userComparator = internalKeyComparator.getUserComparator();
        return ((index < files.size()) &&
                userComparator.compare(largestUserKey, files.get(index).getSmallest().getUserKey()) >= 0);
    }
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    public boolean someFileOverlapsRange(Slice smallestUserKey, Slice largestUserKey)
    {
        InternalKey smallestInternalKey = new InternalKey(smallestUserKey, MAX_SEQUENCE_NUMBER, VALUE);
        int index = findFile(smallestInternalKey);

        UserComparator userComparator = internalKeyComparator.getUserComparator();
        return ((index < files.size()) &&
                userComparator.compare(largestUserKey, files.get(index).getSmallest().getUserKey()) >= 0);
    }
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    // the compaction is producing data in "level+1" for which no data exists
    // in levels greater than "level+1".
    public boolean isBaseLevelForKey(Slice userKey)
    {
        // Maybe use binary search to find right entry instead of linear search?
        UserComparator userComparator = inputVersion.getInternalKeyComparator().getUserComparator();
        for (int level = this.level + 2; level < NUM_LEVELS; level++) {
            List<FileMetaData> files = inputVersion.getFiles(level);
            while (levelPointers[level] < files.size()) {
                FileMetaData f = files.get(levelPointers[level]);
                if (userComparator.compare(userKey, f.getLargest().getUserKey()) <= 0) {
                    // We've advanced far enough
                    if (userComparator.compare(userKey, f.getSmallest().getUserKey()) >= 0) {
                        // Key falls in this file's range, so definitely not base level
                        return false;
                    }
                    break;
                }
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