Examples with Buffer org.neo4j.kernel.impl.nioneo.store.Buffer used on opensource projects

Example 1 with Buffer

use of org.neo4j.kernel.impl.nioneo.store.Buffer in project neo4j-mobile-android by neo4j-contrib.

the class LegacyDynamicStoreReader method getRecord.

private LegacyDynamicRecord getRecord(long blockId, PersistenceWindow window) {
    LegacyDynamicRecord record = new LegacyDynamicRecord(blockId);
    Buffer buffer = window.getOffsettedBuffer(blockId);
    // [    ,   x] in use
    // [xxxx,    ] high bits for prev block
    long inUseByte = buffer.get();
    boolean inUse = (inUseByte & 0x1) == Record.IN_USE.intValue();
    if (!inUse) {
        throw new InvalidRecordException("Not in use, blockId[" + blockId + "]");
    }
    long prevBlock = buffer.getUnsignedInt();
    long prevModifier = (inUseByte & 0xF0L) << 28;
    int dataSize = blockSize - BLOCK_HEADER_SIZE;
    // [    ,    ][xxxx,xxxx][xxxx,xxxx][xxxx,xxxx] number of bytes
    // [    ,xxxx][    ,    ][    ,    ][    ,    ] higher bits for next block
    long nrOfBytesInt = buffer.getInt();
    int nrOfBytes = (int) (nrOfBytesInt & 0xFFFFFF);
    long nextBlock = buffer.getUnsignedInt();
    long nextModifier = (nrOfBytesInt & 0xF000000L) << 8;
    long longNextBlock = LegacyStore.longFromIntAndMod(nextBlock, nextModifier);
    if (longNextBlock != Record.NO_NEXT_BLOCK.intValue() && nrOfBytes < dataSize || nrOfBytes > dataSize) {
        throw new InvalidRecordException("Next block set[" + nextBlock + "] current block illegal size[" + nrOfBytes + "/" + dataSize + "]");
    }
    record.setInUse(true);
    record.setLength(nrOfBytes);
    record.setPrevBlock(LegacyStore.longFromIntAndMod(prevBlock, prevModifier));
    record.setNextBlock(longNextBlock);
    byte[] byteArrayElement = new byte[nrOfBytes];
    buffer.get(byteArrayElement);
    record.setData(byteArrayElement);
    return record;
}

Example 2 with Buffer

use of org.neo4j.kernel.impl.nioneo.store.Buffer in project neo4j-mobile-android by neo4j-contrib.

the class LegacyPropertyStoreReader method readPropertyRecord.

public LegacyPropertyRecord readPropertyRecord(long id) throws IOException {
    PersistenceWindow persistenceWindow = windowPool.acquire(id, OperationType.READ);
    try {
        Buffer buffer = persistenceWindow.getOffsettedBuffer(id);
        // [    ,   x] in use
        // [xxxx,    ] high prev prop bits
        long inUseByte = buffer.get();
        boolean inUse = (inUseByte & 0x1) == Record.IN_USE.intValue();
        if (!inUse) {
            throw new IllegalArgumentException(MessageFormat.format("Record {0} not in use", id));
        }
        LegacyPropertyRecord record = new LegacyPropertyRecord(id);
        // [    ,    ][    ,    ][xxxx,xxxx][xxxx,xxxx] type
        // [    ,    ][    ,xxxx][    ,    ][    ,    ] high next prop bits
        long typeInt = buffer.getInt();
        record.setType(getEnumType((int) typeInt & 0xFFFF));
        record.setInUse(true);
        record.setKeyIndexId(buffer.getInt());
        record.setPropBlock(buffer.getLong());
        long prevProp = buffer.getUnsignedInt();
        long prevModifier = (inUseByte & 0xF0L) << 28;
        long nextProp = buffer.getUnsignedInt();
        long nextModifier = (typeInt & 0xF0000L) << 16;
        record.setPrevProp(LegacyStore.longFromIntAndMod(prevProp, prevModifier));
        record.setNextProp(LegacyStore.longFromIntAndMod(nextProp, nextModifier));
        return record;
    } finally {
        windowPool.release(persistenceWindow);
    }
}