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From "Yakov Zhdanov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-51) Support store-by-value mode
Date Tue, 24 Feb 2015 11:24:04 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Yakov Zhdanov updated IGNITE-51:
    Priority: Blocker  (was: Major)

> 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
>            Assignee: 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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