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https://issues.apache.org/jira/browse/IGNITE-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Semen Boikov closed IGNITE-51.
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Assignee: (was: Semen Boikov)
> Support store-by-value mode
> ---------------------------
>
> Key: IGNITE-51
> URL: https://issues.apache.org/jira/browse/IGNITE-51
> Project: Ignite
> Issue Type: Sub-task
> Components: cache
> Reporter: Semen Boikov
> Priority: Blocker
> Fix For: sprint-2
>
>
> # Need to introduce interface {{CacheObject}} and {{KeyCacheObject}} that
> will hide the implementation details of cached object representation.
> {code}
> public interface CacheObject {
> public <T> T value(GridCacheContext ctx);
> public <T> T getField(String name);
> public byte[] valueBytes();
> }
> public interface KeyCacheObject extends CacheObject {
> public int hashCode();
> }
> {code}
> Implementation of this class must always store serialized form of the object
> and should be optionally store deserialized form of the object if
> {{copyOnGet}} is {{false}}. Cache object must never keep the original
> reference of the user object.
> # Internal cache API should use {{CacheObject}} exclusively and wrap/unwrap
> it to/from user objects on the very top-level-proxy level (unwrap is for
> sure, wrap is subject to discuss).
> # Inside {{GridCacheMapEntry}} fields {{key}}, {{keyBytes}}, {{value}} and
> {{valueBytes}} should be replaced with corresponding {{CacheObject}}
> references for key and value.
> # Same goes for other cache classes that were using keys, values or thereof
> bytes implicitly ({{IgniteTxEntry}}, {{GridCacheEntryInfo}}, etc)
> # Transformation of user object to a cache object in Ignite should be
> implemented in {{GridPortableProcessor}} which should be renamed to
> {{IgniteCacheObjectProcessor}}. {{IgniteCacheSerializarionManager}} should be
> removed.
> # Marshalling of {{CacheObject}} should take advantage of portable
> marshalling mechanism and always use only the serialized bytes stored in the
> {{CacheObject}}. In current implementation {{CacheObjectImpl}} should extend
> {{MessageAdapter}} (UPDATE WILL FOLLOW).
> # {{storeValueBytes}} flag should be removed from configuration.
> # {{binaryEquality}} flag should be introduced to cache configuration
> (default true). When true, cache keys should not be deserialized and binary
> form of the object altogether with the hash code should be used to check key
> equality. {{GridCacheConcurrentMap}} should work explicitly with
> {{CacheObject}} only.
> # {{copyOnGet}} flag should be added to cache configuration (default true).
> When true, new value should be deserialized and returned to user on each
> cache operation implying return value. Ignite should maintain a list of known
> immutable types (such as {{Integer}}, {{String}}) for which {{copyOnGet}} is
> ignored. New annotation {{@IgniteImmutable}} should be introduced to mark
> immutable types for which this flag is also ignored.
> # When indexing is enabled, {{CacheObject}} should always keep deserialized
> version of user object. {{getField()}} method should be used in indexing to
> obtain indexed fields via reflection. {{getField()}} should maintain
> necessary reflection cache to keep current performance level. See
> {{IgniteH2Indexing}} for details.
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