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Zend Framework: Zend\Cache Component Proposal

Proposed Component Name	Zend\Cache
Developer Notes	http://framework.zend.com/wiki/display/ZFDEV/Zend\Cache
Proposers	Marc Bennewitz Pádraic Brady ?
Zend Liaison	TBD
Revision	1.0 - 7 March 2010: Initial Draft. (wiki revision: 11)

The current Zend_Cache component is very inflexible with it's Frontend/Backend structure. It's not possible to merge different frontens together (e.g. MasterFile and Page cache). Furthermore, few advantages of some cache storage systems are not derived by Zend_Cache. E.g. some storage systems can handle different data-types but Zend_Cache only permit strings.

2. References

3. Component Requirements, Constraints, and Acceptance Criteria

TODO
Most requirements take the form of "foo will do ...." or "foo will not support ...", although different words and sentence structure might be used. Adding functionality to your proposal is requirements creep (bad), unless listed below. Discuss major changes with your team first, and then open a "feature improvement" issue against this component.

This component will correctly reads a developers mind for intent and generate the right configuration file.
The generated config file will not support XML, but will provide an extension point in the API.
This component will use no more memory than twice the size of all data it contains.
This component will include a factory method.
This component will not allow subclassing. (i.e. when reviewed, we expect to see "final" keyword in code)
This component will only generate data exports strictly complying with RFC 12345.
This component will validate input data against formats supported by ZF component Foo.
This component will not save any data using Zend_Cache or the filesystem. All transient data will be saved using Zend_Session.

4. Dependencies on Other Framework Components

Zend\Serializer
Zend\Loader\PluginLoader
Zend\Exception

See: http://framework.zend.com/svn/framework/standard/branches/user/mabe/zend_cache-2.0

5. Theory of Operation

Storage Adapter:
The storage adapters are classes of wrappers of the existing storage engines usable for caching (Memcache, Database, File-system ...).
They all implement an interface to get a consistent API but only reflect supported facilities of the used storage engine.

Storage Plugins:
Precisely because the storage adapters supports different facilities you can add facilities belated with the storage plugins.
(e.g. tag support, automatic serialize). The storage plugins have the same API as the storage adapters and therefor implement
the same interface. Where ever a storage adapter is required you can use a storage plugin and you can merge all storage plugins
as you like. The storage plugins self don't storage any data - they need a storage adapter as storage engine.

A special storage plugin is the base cache class (Zend\Cache). It implements additional methods for simpler handling lists of
plugins within the own object. Additionally to enable/disable the cache.

Special Cache Patterns:
Some special cache patterns shouldn't use the standard cache API. They are: Output, Page, Function, Class and Callback.
These caches don't have an interface and implement it's own API.

6. Milestones / Tasks

Milestone 1: Finish proposal
Milestone 2: Working prototype
Milestone 3: Prototype checked into the incubator
Milestone 4: Unit tests exist finished and component is working
Milestone 5: Initial documentation exists
Milestone 6: Changed related components
Milestone 7: Moved to core.

7. Class Index

Storage Adapter:

namespace Zend\Cache\StorageAdapter
interface StorageAdapterInterface
abstract StorageAdapterAbstract implements StorageAdapterInterface
class Variable extends StorageAdapterAbstract
class Memcache(d?) extends StorageAdapterAbstract
class Apc extends StorageAdapterAbstract
class WinCache extends StorageAdapterAbstract
class Xcache extends StorageAdapterAbstract
class ZendServerShm extends StorageAdapterAbstract
class ZendServerDisk extends StorageAdapterAbstract
class ZendPlatform extends StorageAdapterAbstract
class Database extends StorageAdapterAbstract
class Filesystem extends StorageAdapterAbstract

Storage Plugins:

namespace Zend\Cache\StoragePlugin
interface StoragePluginInterface extends \Zend\Cache\StorageAdapter\StorageAdapterInterface
abstract Zend\Cache\StoragePlugin\StoragePluginAbstract implements StoragePluginInterface
class AutomaticClear extends StoragePluginAbstract
class AutomaticOptimize extends StoragePluginAbstract
class EscapeKey extends StoragePluginAbstract
class ExceptionHandler extends StoragePluginAbstract
class ExceptionLogger extends StoragePluginAbstract
class FileMTime extends StoragePluginAbstract
class FileATime extends StoragePluginAbstract
class FileCTime extends StoragePluginAbstract
class FileHash extends StoragePluginAbstract
class IgnoreUserAbort extends StoragePluginAbstract
class MTime extends StoragePluginAbstract
class Prefix extends StoragePluginAbstract
class Serialize extends StoragePluginAbstract
class Tagging extends StoragePluginAbstract
class TwoLevels extends StoragePluginAbstract
class WriteControl extends StoragePluginAbstract

namespace Zend
class Cache extends \Zend\Cache\StoragePlugin\StoragePluginAbstract

Special Cache Patterns:

namesapce Zend\Cache
class CallbackCache
class ClassCache
class FunctionCache
class OutputCache
class PageCache

Manager:

namesapce Zend\Cache
class Manager

Exceptions:

namesapce Zend\Cache
interface Exception extends \Zend\Exception
class InvalidArgumentException extends \InvalidArgumentException implements Exception
class UnexpectedValueException extends \UnexpectedValueException implements Exception
class LoaderException extends \Exception implements Exception
class BadMethodCallException extends \BadMethodCallException implements Exception

TODO: Zend_Cache_Frontend_Capture
TODO: Zend_Cache_Backend_Static
TODO: Zend_Cache_Backend_BlackHole - Is this needed anymore ?

8. Use Cases

9. Class Skeletons

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Zend Cache 2.0 - Marc Bennewitz