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BinaryObjects

BinaryObject(Impl)s have the different structurestructures:

Code Block
languagejava
titleBinaryObjectImpl
private Object obj; // Deserialized value.
private byte[] arr; // Serialized bytes.

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In a lucky circumstance, BinaryObjectImpl require requires no marshalling, serialization already generates byte which can be used as marshalled bytes.

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It's not possible to just replace arr with valBytes because, unlike, for example, from CacheObjectImpl arr is not just a mashalled bytes, it's a an object's value required, for example, to provide hashCode/schemaId/typeId/objectField.

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So, we must provide a simple way to append any transformation.

API

Simplest The simplest way is to use Service Provider Interface (IgniteSpi):

Code Block
languagejava
titleSPI
public interface CacheObjectTransformerSpi extends IgniteSpi {
    /** Additional space required to store the transformed data. */
    public int OVERHEAD = 6;

    /**
     * Transforms the data.
     *
     * @param bytes  Byte array contains the data.
     * @param offset Data offset.
     * @param length Data length.
     * @return Byte array contains the transformed data started with non-filled area with {@link #OVERHEAD} size.
     * @throws IgniteCheckedException when transformation is not possible/suitable.
     */
    public byte[] transform(byte[] bytes, int offset, int length) throws IgniteCheckedException;

    /**
     * Restores the data.
     *
     * @param bytes  Byte array ending with the transformed data.
     * @param offset Transformed data offset.
     * @param length Original data length.
     * @return Byte array contains the restored data.
     */
    public byte[] restore(byte[] bytes, int offset, int length);
}

This API is known about for the overhead used to store transformed data and allows it to work with byte arrays with custom offsets, which is necessary to guarantee performance.

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