com.netflix.hollow.core.util

Interface HollowObjectHashCodeFinder

All Known Implementing Classes:

DefaultHashCodeFinder

public interface HollowObjectHashCodeFinder

Use of this interface is not recommended. Instead, use the hash key functionality available sets and maps.

With this interface, in conjunction with a cooperating data ingestion mechanism, it is possible to use custom hash codes in Hollow sets and maps.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	DEFINED_HASH_CODES_HEADER_NAME

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Set<java.lang.String>	getTypesWithDefinedHashCodes() Returns the set of types which have hash codes defined (i.e.
int	hashCode(int ordinal, java.lang.Object objectToHash) Deprecated.
int	hashCode(java.lang.Object objectToHash) For look-up at runtime.
int	hashCode(java.lang.String typeName, int ordinal, java.lang.Object objectToHash) For serialization.

Field Detail

DEFINED_HASH_CODES_HEADER_NAME

static final java.lang.String DEFINED_HASH_CODES_HEADER_NAME

See Also:

Constant Field Values

Method Detail

hashCode

int hashCode(java.lang.Object objectToHash)

For look-up at runtime.

If using simple ordinal-based hashing, then objectToHash must be a HollowRecord, and the return value will be objectToHash.getOrdinal();

Otherwise, the hash code is determined with exactly the same logic as was used during serialization.

hashCode

int hashCode(java.lang.String typeName,
           int ordinal,
           java.lang.Object objectToHash)

For serialization.

At serialization time, we know the ordinal of a newly added object, but may not know how to hash the object which is being serialized, which is necessary for Sets and Maps.

If using simple ordinal-based hashing, the ordinal will be returned. Otherwise, the return value will be calculated based on the objectToHash.

getTypesWithDefinedHashCodes

java.util.Set<java.lang.String> getTypesWithDefinedHashCodes()

Returns the set of types which have hash codes defined (i.e. hash codes which are not simply each record's ordinal)

Returns:

hashCode

@Deprecated
int hashCode(int ordinal,
                      java.lang.Object objectToHash)

Deprecated.