org.mapdb

Class Serializer.EightByteSerializer<E>

java.lang.Object

org.mapdb.Serializer<E>

org.mapdb.Serializer.EightByteSerializer<E>

Direct Known Subclasses:

Serializer.LongSerializer

Enclosing class:

Serializer<A>

protected abstract static class Serializer.EightByteSerializer<E>
extends Serializer<E>

Nested Class Summary

Nested classes/interfaces inherited from class org.mapdb.Serializer

Serializer.Array<T>, Serializer.BooleanSer, Serializer.CompressionDeflateWrapper<E>, Serializer.CompressionWrapper<E>, Serializer.EightByteSerializer<E>, Serializer.FourByteSerializer<E>, Serializer.IntegerSerializer, Serializer.LongSerializer

Field Summary

Fields inherited from class org.mapdb.Serializer

BASIC, BIG_DECIMAL, BIG_INTEGER, BOOLEAN, BOOLEAN_ARRAY, BYTE, BYTE_ARRAY, BYTE_ARRAY_NOSIZE, CHAR, CHAR_ARRAY, CLASS, DATE, DOUBLE, DOUBLE_ARRAY, FLOAT, FLOAT_ARRAY, ILLEGAL_ACCESS, INT_ARRAY, INTEGER, INTEGER_PACKED, INTEGER_PACKED_ZIGZAG, JAVA, LONG, LONG_ARRAY, LONG_PACKED, LONG_PACKED_ZIGZAG, RECID, RECID_ARRAY, SHORT, SHORT_ARRAY, STRING, STRING_ASCII, STRING_INTERN, STRING_NOSIZE, STRING_XXHASH, UUID

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Serializer.EightByteSerializer()

Method Summary

Methods

Modifier and Type	Method and Description
int	fixedSize() Data could be serialized into record with variable size or fixed size.
boolean	isTrusted() MapDB has relax record size boundary checking.
protected abstract long	pack(E l)
protected abstract E	unpack(long l)
Object	valueArrayCopyOfRange(Object vals, int from, int to)
Object	valueArrayDeleteValue(Object vals, int pos)
Object	valueArrayDeserialize(DataInput in, int size)
Object	valueArrayEmpty()
Object	valueArrayFromArray(Object[] objects)
E	valueArrayGet(Object vals, int pos)
Object	valueArrayPut(Object vals, int pos, E newValue)
void	valueArraySerialize(DataOutput out, Object vals)
int	valueArraySize(Object vals)
Object	valueArrayUpdateVal(Object vals, int pos, E newValue)

Methods inherited from class org.mapdb.Serializer

deserialize, equals, getBTreeKeySerializer, hashCode, serialize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Serializer.EightByteSerializer

protected Serializer.EightByteSerializer()

Method Detail

unpack

protected abstract E unpack(long l)

pack

protected abstract long pack(E l)

valueArrayGet

public E valueArrayGet(Object vals,
              int pos)

Overrides:

valueArrayGet in class Serializer<E>

valueArraySize

public int valueArraySize(Object vals)

Overrides:

valueArraySize in class Serializer<E>

valueArrayEmpty

public Object valueArrayEmpty()

Overrides:

valueArrayEmpty in class Serializer<E>

valueArrayPut

public Object valueArrayPut(Object vals,
                   int pos,
                   E newValue)

Overrides:

valueArrayPut in class Serializer<E>

valueArrayUpdateVal

public Object valueArrayUpdateVal(Object vals,
                         int pos,
                         E newValue)

Overrides:

valueArrayUpdateVal in class Serializer<E>

valueArrayFromArray

public Object valueArrayFromArray(Object[] objects)

Overrides:

valueArrayFromArray in class Serializer<E>

valueArrayCopyOfRange

public Object valueArrayCopyOfRange(Object vals,
                           int from,
                           int to)

Overrides:

valueArrayCopyOfRange in class Serializer<E>

valueArrayDeleteValue

public Object valueArrayDeleteValue(Object vals,
                           int pos)

Overrides:

valueArrayDeleteValue in class Serializer<E>

valueArraySerialize

public void valueArraySerialize(DataOutput out,
                       Object vals)
                         throws IOException

Overrides:

valueArraySerialize in class Serializer<E>

Throws:

IOException

valueArrayDeserialize

public Object valueArrayDeserialize(DataInput in,
                           int size)
                             throws IOException

Overrides:

valueArrayDeserialize in class Serializer<E>

Throws:

IOException

isTrusted

public boolean isTrusted()

Description copied from class: Serializer

MapDB has relax record size boundary checking. It expect deserializer to read exactly as many bytes as were writen during serialization. If deserializer reads more bytes it might start reading others record data in store.

Some serializers (Kryo) have problems with this. To prevent this we can not read data directly from store, but must copy them into separate byte[]. So zero copy optimalizations is disabled by default, and must be explicitly enabled here.

This flag indicates if this serializer was 'verified' to read as many bytes as it writes. It should be also much better tested etc.

Overrides:

isTrusted in class Serializer<E>

Returns:

true if this serializer is well tested and writes as many bytes as it reads.

fixedSize

public int fixedSize()

Description copied from class: Serializer

Data could be serialized into record with variable size or fixed size. Some optimizations can be applied to serializers with fixed size

Overrides:

fixedSize in class Serializer<E>

Returns:

fixed size or -1 for variable size