org.gridgain.grid.cache.conflict

Enum CacheConflictMode

java.lang.Object

java.lang.Enum<CacheConflictMode>

org.gridgain.grid.cache.conflict.CacheConflictMode

All Implemented Interfaces:

Serializable, Comparable<CacheConflictMode>

public enum CacheConflictMode
extends Enum<CacheConflictMode>

Cache conflict resolver mode.

Each cache entry has data center ID. In case cache update is performed and either old or new cache entry has data center ID which differs from local data center ID defined by GridGainConfiguration.getDataCenterId(), then we consider such situation as conflict.

If both entries participating in conflict have the same data center ID (i.e. they both were replicated from the same remote data center), then GridGain can potentially resolve this conflict automatically based on entry metadata.

But in case old and new entries have different data center IDs (i.e. in active-active scenario when cache is updated in both data centers participating in data center replication, or when cache is updated from multiple remote data centers), then explicit conflict resolution is required.

This enumeration provides several different strategies for conflict resolution.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALWAYS GridGain will always delegate to conflict resolver.
AUTO GridGain will automatically resolve conflicts when possible (i.e. when both old and new entries have the same data center ID).

Method Summary

Modifier and Type	Method and Description
static @Nullable CacheConflictMode	fromOrdinal(int ord) Efficiently gets enumerated value from its ordinal.
static CacheConflictMode	valueOf(String name) Returns the enum constant of this type with the specified name.
static CacheConflictMode[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

AUTO

public static final CacheConflictMode AUTO

GridGain will automatically resolve conflicts when possible (i.e. when both old and new entries have the same data center ID). In all other situations, conflict resolution will be delegated to CacheConflictResolver configured through GridGainCacheConfiguration.getConflictResolver(). In case conflict resolver is not configured, GridGain will overwrite old entry with a new one.

This mode is default.

ALWAYS

public static final CacheConflictMode ALWAYS

GridGain will always delegate to conflict resolver. This applies to all possible cases, even if both old and new entries have local data center ID and therefore are not considered conflicting when cache is not data center replication receiver.

In this mode GridGainCacheConfiguration.getConflictResolver() is mandatory.

Method Detail

values

public static CacheConflictMode[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (CacheConflictMode c : CacheConflictMode.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static CacheConflictMode valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

fromOrdinal

@Nullable
public static @Nullable CacheConflictMode fromOrdinal(int ord)

Efficiently gets enumerated value from its ordinal.

Parameters:

ord - Ordinal value.

Returns:

Enumerated value or null if ordinal out of range.