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The Dublin Core metadata element set
is a standard for cross-domain information resource description.
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| Element | Description | Value |
|---|---|---|
| Identifier | resource ID | http://old.zope.org/Members/k_vertigo/Products/FreeTxn |
| Title | resource name | |
| Description | resource summary | Free Transactions This is an attempt to associate zodb transactions on a per connection basis. the major benefits is by disassociating the transaction to thread association we can have multiple connections in a single thread and hence multiple dbs open while maintaining per connection transaction integrity. functional changes to application code Application code can continue to use get_transaction().register(ob) as long as ob is a persistent object or a zodb connection. Application code that tries to integrate non-persistent objects for transactional control needs to call get_transaction() with a persistent object or connection as an arg so that it can be registered with an appropiate connection. Transitioning between transaction states cannot be done via get_transaction(), a persistent object or connection must be passed in so the proper transaction is returned. what doesn't work - versions... i've never really used versions, so i'm not sure about their implementation, other than it looks strange;) - mounted storages. this is an alternative to this approach for multi db systems, but requires? treating multiple dbs as one logical unit. it might work i have no idea... it seems more a zopish thing at the moment. - probably most advanced usages... some things i've seen like db.open with a transaction. basically use of the full range of ZODB features (ie Zope) will not work. otoh, most basic and common usages as a POS will probably work. other caveats multi-threaded code shouldn't have share connections, its probably better for such code to use and return conns to the db as needed. installation import this module and call the install_free_txn function, which will hotpatch the connection and transaction classes and install the get_transaction accessor in globals. - transaction.py abort free transaction - connection.py sync method, pass in self tests i did some basic tests. if it breaks you get to keep both pieces license Zope Public License (ZPL) ZPL 1.0 or a later version of the ZPL at your discretion. author: kapil thangavelu <[email protected]> |
| Creator | resource creator | ZopeOrgSite |
| Date | default date | 2001-10-24 18:35:59 |
| Format | resource format | text/html |
| Type | resource type | Software Package |
| Subject | resource keywords | Developer |
| Contributors | resource collaborators | |
| Language | resource language | |
| Publisher | resource publisher | No publisher |
| Rights | resource copyright | |
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| Element | Description | Value |
| CreationDate | date resource created | 2001-10-24 18:35:59 |
| ModificationDate | date resource last modified | 2001-10-24 18:35:59 |
| EffectiveDate | date resource becomes effective | None |
| ExpirationDate | date resource expires | None |
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