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From "Stephen Fitch (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-646) In-memory backend storage support
Date Thu, 27 Oct 2005 18:23:56 GMT
     [ http://issues.apache.org/jira/browse/DERBY-646?page=all ]

Stephen Fitch updated DERBY-646:
--------------------------------

    Attachment: in-memory.tar
                svn.diff

I currently have an in-memory implementation of the storage factory interface "working" with
the embedded client. It requires a very minimal change to one existing class and the addition
of 6 more.

It's easily plugged into the embeded client with -Dderby.subSubProtocol.memory=org.apache.derby.impl.io.MemoryStorageFactory,
but I'm still trying to work out how to get it going with the network server. (use jdbc:derby:memory:<database;attributes>
as connection url)

MemoryStorageFactory - In-memory implementation of StorageFactory

MemoryStorageFile extends InputStreamFile - wraps most calls to another class with a hashtable
keyed by full filepath names

MemoryStorageRandomAccessFile - extends java.io.RandomAccessFile and overrides its' read,
write and native methods.

DynamicByteArrayIOStream - Readable, writable dynamically accessible byte array. This was
done because I didnt want to have to implement the DataInput and DataOutput interfaces specified
by the StorageRandomAccessFile interface (which would have been just copying them from java.io.RandomAccessFile).
 It is by no means an optimal implementation, but it works.

DynamicByteArrayIOStreamFile - the class above extended with file attributes (ex: do I exist,
am I a directory).

MemoryMetadata - generalized location for StorageFile paths and DynamicByteArrayIOStreamFile
objects. Also

The naming convention is debatable and as this is still a work in progress can be changed.

Any and all suggestions welcome :)

> In-memory backend storage support
> ---------------------------------
>
>          Key: DERBY-646
>          URL: http://issues.apache.org/jira/browse/DERBY-646
>      Project: Derby
>         Type: New Feature
>   Components: Store
>  Environment: All
>     Reporter: Stephen Fitch
>  Attachments: in-memory.tar, svn.diff
>
> To allow creation and modification of databases in-memory without requiring disk access
or space to store the database.

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