Jackson 3.0.1 · tools.jackson.databind.deser.DeserializerCache

Modifier and Type	Field and Description
private final LookupCache<JavaType, ValueDeserializer<Object>>	_cachedDeserializers We will also cache some dynamically constructed deserializers; specifically, ones that are expensive to construct.
private final transient HashMap<JavaType, ValueDeserializer<Object>>	_incompleteDeserializers During deserializer construction process we may need to keep track of partially completed deserializers, to resolve cyclic dependencies.
private final ReentrantLock	_incompleteDeserializersLock We hold an explicit lock while creating deserializers to avoid creating duplicates.
public static final int	DEFAULT_MAX_CACHE_SIZE Default size of the underlying cache to use.
private static final long	serialVersionUID

Access	Constructor and Description
public	DeserializerCache()
public	DeserializerCache(LookupCache<JavaType, ValueDeserializer<Object>> cache)

Method Summary

Modifier and Type	Method and Description
protected ValueDeserializer<Object>	_createAndCache2(DeserializationContext ctxt, DeserializerFactory factory, JavaType type, boolean isCustom) Method that handles actual construction (via factory) and caching (both intermediate and eventual)
protected ValueDeserializer<Object>	_createAndCacheValueDeserializer(DeserializationContext Currently active deserialization context ctxt, DeserializerFactory factory, JavaType Type of property to deserialize (never null, callers verify) type) Method that will try to create a deserializer for given type, and resolve and cache it if necessary
protected ValueDeserializer<Object>	_createDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) Method that does the heavy lifting of checking for per-type annotations, find out full type, and figure out which actual factory method to call.
protected ValueDeserializer<?>	_createDeserializer2(DeserializationContext ctxt, DeserializerFactory factory, JavaType type, BeanDescription.Supplier beanDescRef)
protected ValueDeserializer<Object>	_findCachedDeserializer(JavaType type)
protected KeyDeserializer	_handleUnknownKeyDeserializer(DeserializationContext ctxt, JavaType type)
protected ValueDeserializer<Object>	_handleUnknownValueDeserializer(DeserializationContext ctxt, JavaType type)
private boolean	_hasCustomHandlers(JavaType t) Helper method used to prevent both caching and cache lookups for structured types that have custom value handlers
private Class<?>	_verifyAsClass(Object src, String methodName, Class<?> noneClass)
public int	cachedDeserializersCount() Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works).
public DeserializerCache	emptyCopy()
protected Converter<Object, Object>	findConverter(DeserializationContext ctxt, Annotated a)
protected ValueDeserializer<Object>	findConvertingDeserializer(DeserializationContext ctxt, Annotated a, ValueDeserializer<Object> deser) Helper method that will check whether given annotated entity (usually class, but may also be a property accessor) indicates that a `Converter` is to be used; and if so, to construct and return suitable serializer for it.
protected ValueDeserializer<Object>	findDeserializerFromAnnotation(DeserializationContext ctxt, Annotated ann) Helper method called to check if a class or method has annotation that tells which class to use for deserialization.
public KeyDeserializer	findKeyDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) Method called to get hold of a deserializer to use for deserializing keys for `java.util.Map`.
public ValueDeserializer<Object>	findValueDeserializer(DeserializationContext Deserialization context ctxt, DeserializerFactory factory, JavaType Declared type of the value to deserializer (obtained using 'setter' method signature and/or type annotations propertyType) Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked).
public void	flushCachedDeserializers() Method that will drop all dynamically constructed deserializers (ones that are counted as result value for `cachedDeserializersCount`).
private JavaType	Returns: Original type if no annotations are present; or a more specific type derived from it if type annotation(s) was found modifyTypeByAnnotation(DeserializationContext ctxt, Annotated Method or field that the type is associated with a, JavaType Type derived from the setter argument type) Method called to see if given method has annotations that indicate a more specific type than what the argument specifies.
protected Object	readResolve()

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

_cachedDeserializers	back to summary
private final LookupCache<JavaType, ValueDeserializer<Object>> _cachedDeserializers We will also cache some dynamically constructed deserializers; specifically, ones that are expensive to construct. This currently (3.0) means POJO, Enum and Container (collection, map) deserializers.

_incompleteDeserializers	back to summary
private final transient HashMap<JavaType, ValueDeserializer<Object>> _incompleteDeserializers During deserializer construction process we may need to keep track of partially completed deserializers, to resolve cyclic dependencies. This is the map used for storing deserializers before they are fully complete.

_incompleteDeserializersLock	back to summary
private final ReentrantLock _incompleteDeserializersLock We hold an explicit lock while creating deserializers to avoid creating duplicates. Guards `_incompleteDeserializers`.

DEFAULT_MAX_CACHE_SIZE	back to summary
public static final int DEFAULT_MAX_CACHE_SIZE Default size of the underlying cache to use. Note reduced from 2.x default.

serialVersionUID	back to summary
private static final long serialVersionUID

DeserializerCache	back to summary
public DeserializerCache()

DeserializerCache	back to summary
public DeserializerCache(LookupCache<JavaType, ValueDeserializer<Object>> cache)

Method Detail

_createAndCache2	back to summary
protected ValueDeserializer<Object> _createAndCache2(DeserializationContext ctxt, DeserializerFactory factory, JavaType type, boolean isCustom) Method that handles actual construction (via factory) and caching (both intermediate and eventual)

_createAndCacheValueDeserializer	back to summary
protected ValueDeserializer<Object> _createAndCacheValueDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) Method that will try to create a deserializer for given type, and resolve and cache it if necessary Parameters ctxt:DeserializationContext Currently active deserialization context type:JavaType Type of property to deserialize (never null, callers verify)

_createAndCacheValueDeserializer

back to summary

protected ValueDeserializer<Object> _createAndCacheValueDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type)

Method that will try to create a deserializer for given type, and resolve and cache it if necessary

Parameters

ctxt:DeserializationContext: Currently active deserialization context
type:JavaType: Type of property to deserialize (never null, callers verify)

_createDeserializer	back to summary
protected ValueDeserializer<Object> _createDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) Method that does the heavy lifting of checking for per-type annotations, find out full type, and figure out which actual factory method to call. Annotations @SuppressWarnings:unchecked

_createDeserializer

back to summary

protected ValueDeserializer<Object> _createDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type)

Method that does the heavy lifting of checking for per-type annotations, find out full type, and figure out which actual factory method to call.

Annotations

@SuppressWarnings:unchecked

_createDeserializer2	back to summary
protected ValueDeserializer<?> _createDeserializer2(DeserializationContext ctxt, DeserializerFactory factory, JavaType type, BeanDescription.Supplier beanDescRef)

_findCachedDeserializer	back to summary
protected ValueDeserializer<Object> _findCachedDeserializer(JavaType type)

_handleUnknownKeyDeserializer	back to summary
protected KeyDeserializer _handleUnknownKeyDeserializer(DeserializationContext ctxt, JavaType type)

_handleUnknownValueDeserializer	back to summary
protected ValueDeserializer<Object> _handleUnknownValueDeserializer(DeserializationContext ctxt, JavaType type)

_hasCustomHandlers	back to summary
private boolean _hasCustomHandlers(JavaType t) Helper method used to prevent both caching and cache lookups for structured types that have custom value handlers

_verifyAsClass	back to summary
private Class<?> _verifyAsClass(Object src, String methodName, Class<?> noneClass)

cachedDeserializersCount	back to summary
public int cachedDeserializersCount() Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works). The main use case for this method is to allow conditional flushing of deserializer cache, if certain number of entries is reached.

cachedDeserializersCount

back to summary

public int cachedDeserializersCount()

Method that can be used to determine how many deserializers this provider is caching currently (if it does caching: default implementation does) Exact count depends on what kind of deserializers get cached; default implementation caches only dynamically constructed deserializers, but not eagerly constructed standard deserializers (which is different from how serializer provider works).

The main use case for this method is to allow conditional flushing of deserializer cache, if certain number of entries is reached.

emptyCopy	back to summary
public DeserializerCache emptyCopy()

findConverter	back to summary
protected Converter<Object, Object> findConverter(DeserializationContext ctxt, Annotated a)

findConvertingDeserializer back to summary

findConvertingDeserializer	back to summary
protected ValueDeserializer<Object> findConvertingDeserializer(DeserializationContext ctxt, Annotated a, ValueDeserializer<Object> deser) Helper method that will check whether given annotated entity (usually class, but may also be a property accessor) indicates that a `Converter` is to be used; and if so, to construct and return suitable serializer for it. If not, will simply return given serializer as is.

protected ValueDeserializer<Object> findConvertingDeserializer(DeserializationContext ctxt, Annotated a, ValueDeserializer<Object> deser)

Helper method that will check whether given annotated entity (usually class, but may also be a property accessor) indicates that a Converter is to be used; and if so, to construct and return suitable serializer for it. If not, will simply return given serializer as is.

findDeserializerFromAnnotation	back to summary
protected ValueDeserializer<Object> findDeserializerFromAnnotation(DeserializationContext ctxt, Annotated ann) Helper method called to check if a class or method has annotation that tells which class to use for deserialization. Returns null if no such annotation found.

findKeyDeserializer back to summary

findKeyDeserializer	back to summary
public KeyDeserializer findKeyDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type) Method called to get hold of a deserializer to use for deserializing keys for `java.util.Map`. Exceptions DatabindException: if there are fatal problems with accessing suitable key deserializer; including that of not finding any serializer

public KeyDeserializer findKeyDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType type)

Method called to get hold of a deserializer to use for deserializing keys for java.util.Map.

Exceptions

DatabindException:: if there are fatal problems with accessing suitable key deserializer; including that of not finding any serializer

findValueDeserializer back to summary

findValueDeserializer	back to summary
public ValueDeserializer<Object> findValueDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType propertyType) Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked). Note this method is only called for value types; not for keys. Key deserializers can be accessed using `findKeyDeserializer`. Note also that deserializer returned is guaranteed to be resolved (see `ValueDeserializer#resolve`), but not contextualized (wrt `ValueDeserializer#createContextual`): caller has to handle latter if necessary. Parameters ctxt:DeserializationContext Deserialization context propertyType:JavaType Declared type of the value to deserializer (obtained using 'setter' method signature and/or type annotations

public ValueDeserializer<Object> findValueDeserializer(DeserializationContext ctxt, DeserializerFactory factory, JavaType propertyType)

Method called to get hold of a deserializer for a value of given type; or if no such deserializer can be found, a default handler (which may do a best-effort generic serialization or just simply throw an exception when invoked).

Note

this method is only called for value types; not for keys. Key deserializers can be accessed using findKeyDeserializer.

Note also that deserializer returned is guaranteed to be resolved (see ValueDeserializer#resolve), but not contextualized (wrt ValueDeserializer#createContextual): caller has to handle latter if necessary.

Parameters

ctxt:DeserializationContext: Deserialization context
propertyType:JavaType: Declared type of the value to deserializer (obtained using 'setter' method signature and/or type annotations

flushCachedDeserializers	back to summary
public void flushCachedDeserializers() Method that will drop all dynamically constructed deserializers (ones that are counted as result value for `cachedDeserializersCount`). This can be used to remove memory usage (in case some deserializers are only used once or so), or to force re-construction of deserializers after configuration changes for mapper than owns the provider.

modifyTypeByAnnotation	back to summary
private JavaType modifyTypeByAnnotation(DeserializationContext ctxt, Annotated a, JavaType type) Method called to see if given method has annotations that indicate a more specific type than what the argument specifies. If annotations are present, they must specify compatible Class; instance of which can be assigned using the method. This means that the Class has to be raw class of type, or its sub-class (or, implementing class if original Class instance is an interface). Parameters a:Annotated Method or field that the type is associated with type:JavaType Type derived from the setter argument Returns:JavaType Original type if no annotations are present; or a more specific type derived from it if type annotation(s) was found

modifyTypeByAnnotation

back to summary

private JavaType modifyTypeByAnnotation(DeserializationContext ctxt, Annotated a, JavaType type)

Method called to see if given method has annotations that indicate a more specific type than what the argument specifies. If annotations are present, they must specify compatible Class; instance of which can be assigned using the method. This means that the Class has to be raw class of type, or its sub-class (or, implementing class if original Class instance is an interface).

Parameters

a:Annotated: Method or field that the type is associated with
type:JavaType: Type derived from the setter argument

Returns:JavaType

Original type if no annotations are present; or a more specific type derived from it if type annotation(s) was found

readResolve	back to summary
protected Object readResolve()

public final Class DeserializerCache

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