Package org.mapdb.elsa

Class ElsaStack

java.lang.Object

org.mapdb.elsa.ElsaStack

Direct Known Subclasses:

ElsaStack.IdentityArray, ElsaStack.MapStack, ElsaStack.NoReferenceStack

public abstract class ElsaStack
extends Object

ElsaStack contains already serialized object. Elsa check for backward references, by comparing newly serialized objects against Stack content. This comparation could be major overhead, so there are three strategies (Stack implementations) for object comparation:

• IdentityHashMap is good for large object arrays, is enabled by default
• HashMap is very slow (full Object.equals()), but performs full deduplication.
• Array with linear search, smaller overhead, but performance degrades fast. Better for tiny objects (5 items)
• No check. Good for primitive objects. Backward (more precisely cyclic) can cause infinitive loop.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	ElsaStack.IdentityArray	uses array with linear identity (==) search.
static final class	ElsaStack.MapStack	Uses map (typically IdentityHashMap to resolve objects.
static final class	ElsaStack.NoReferenceStack	No backward references are resolved, no stack is maintained

Field Summary

Fields

Modifier and Type	Field	Description
private ElsaSerializerPojo.ClassInfo[]	classInfos

Constructor Summary

Constructors

Constructor	Description
ElsaStack()

Method Summary

Modifier and Type	Method	Description
abstract void	add(Object o)
int	addClassInfo(ElsaSerializerPojo.ClassInfo clazzInfo)
abstract Object	getInstance(int i)
abstract int	getSize()
abstract int	identityIndexOf(Object obj)
int	resolveClassId(String clazzName)
ElsaSerializerPojo.ClassInfo	resolveClassInfo(int classId)

Methods inherited from class java.lang.Object

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

Field Details

classInfos

private ElsaSerializerPojo.ClassInfo[] classInfos

Constructor Details

ElsaStack

public ElsaStack()

Method Details

add

public abstract void add(Object o)

identityIndexOf

public abstract int identityIndexOf(Object obj)

getSize

public abstract int getSize()

getInstance

public abstract Object getInstance(int i)

resolveClassId

public int resolveClassId(String clazzName)

addClassInfo

public int addClassInfo(ElsaSerializerPojo.ClassInfo clazzInfo)

resolveClassInfo

public ElsaSerializerPojo.ClassInfo resolveClassInfo(int classId)