Julian Noble
11 months ago
3 changed files with 0 additions and 203 deletions
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[comment {--- punk::docgen generated from inline doctools comments ---}] |
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[comment {--- punk::docgen DO NOT EDIT DOCS HERE UNLESS YOU REMOVE THESE COMMENT LINES ---}] |
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[comment {--- punk::docgen overwrites this file ---}] |
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[manpage_begin punk::cap 0 0.1.0] |
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[copyright "2023 JMNoble - BSD licensed"] |
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[titledesc {capability provider and handler plugin system}] |
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[moddesc {punk capabilities plugin system}] |
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[require punk::cap] |
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[description] |
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[section Overview] |
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[para]punk::cap provides management of named capabilities and the provider packages and handler packages that implement a pluggable capability. |
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[subsection Concepts] |
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[para]A [term capability] may be something like providing a folder of files, or just a data dictionary, and/or an API |
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[para][term {capability handler}] - a package/namespace which may provide validation and standardised ways of looking up provider data |
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registered (or not) using register_capabilityname <capname> <capnamespace> |
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[para][term {capability provider}] - a package which registers as providing one or more capablities. |
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[para]registered using register_package <pkg> <capabilitylist> |
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the capabilitylist is a list of 2-element lists where the first element is the capabilityname and the second element is a (possibly empty) dict of data relevant to that capability |
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A capabilityname may appear multiple times. ie a package may register that it provides the capability with multiple datasets. |
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[section API] |
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[subsection {Namespace punk::cap::class}] |
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[para] class definitions |
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[list_begin itemized] [comment {- punk::cap::class groupings -}] |
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[item] |
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[para] [emph {handler_classes}] |
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[list_begin enumerated] |
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[enum] [emph {CLASS interface_caphandler.registry}] |
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[list_begin definitions] |
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[call class::[class interface_caphandler.registry] [method pkg_register] [arg pkg] [arg capname] [arg capdict] [arg fullcapabilitylist]] |
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handler may override and return 0 (indicating don't register)e.g if pkg capdict data wasn't valid |
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overridden handler must be able to handle multiple calls for same pkg - but it may return 1 or 0 as it wishes. |
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[call class::[class interface_caphandler.registry] [method pkg_unregister] [arg pkg]] |
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[list_end] |
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[enum] [emph {CLASS interface_caphandler.sysapi}] |
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[list_begin definitions] |
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[list_end] |
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[list_end] [comment {- end enumeration handler classes -}] |
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[item] |
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[para] [emph {provider_classes}] |
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[list_begin enumerated] |
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[enum] [emph {CLASS interface_cappprovider.registration}] |
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Your provider package will need to instantiate this object under a sub-namespace called [namespace capsystem] within your package namespace. |
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[para]If your package namespace is mypackages::providerpkg then the object command would be at mypackages::providerpkg::capsystem::capprovider.registration |
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[para]Example code for your provider package to evaluate within its namespace: |
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[example { |
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namespace eval capsystem { |
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if {[info commands capprovider.registration] eq ""} { |
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punk::cap::class::interface_capprovider.registration create capprovider.registration |
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oo::objdefine capprovider.registration { |
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method get_declarations {} { |
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set decls [list] |
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lappend decls [list punk.templates {relpath ../templates}] |
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lappend decls [list another_capability_name {somekey blah key2 etc}] |
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return $decls |
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} |
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} |
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} |
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} |
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}] |
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[para] The above example declares that your package can be registered as a provider for the capabilities named 'punk.templates' and 'another_capability_name' |
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[list_begin definitions] |
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[call class::[class interface_capprovider.registration] [method get_declarations]] |
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[para] This method must be overridden by your provider using oo::objdefine cappprovider.registration as in the example above. |
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There must be at least one 2-element list in the result for the provider to be registerable. |
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[para]The first element of the list is the capabilityname - which can be custom to your provider/handler packages - or a well-known name that other authors may use/implement. |
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[para]The second element is a dictionary of keys specific to the capability being implemented. It may be empty if the any potential capability handlers for the named capability don't require registration data. |
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[list_end] |
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[enum] [emph {CLASS interface_capprovider.provider}] |
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[para] Your provider package will need to instantiate this directly under it's own namespace with the command name of [emph {provider}] |
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[example { |
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namespace eval mypackages::providerpkg { |
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punk::cap::class::interface_capprovider.provider create provider mypackages::providerpkg |
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} |
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}] |
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[list_begin definitions] |
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[call class::[class interface_capprovider.provider] [method constructor] [arg providerpkg]] |
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[comment {- -- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---}] |
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[call class::[class interface_capprovider.provider] [method register] [opt capabilityname_glob]] |
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[para]This is the mechanism by which a user of your provider package will register your package as a provider of the capability named. |
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[para]A user of your provider may elect to register all your declared capabilities: |
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[example { |
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package require mypackages::providerpkg |
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mypackages::providerpkg::provider register * |
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}] |
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[para] Or a specific capability may be registered: |
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[example { |
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package require mypackages::providerpkg |
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mypackages::providerpkg::provider register another_capability_name |
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}] |
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[comment {- -- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---}] |
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[call class::[class interface_capprovider.provider] [method capabilities]] |
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[para] return a list of capabilities supported by this provider package |
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[list_end] [comment {- end class definitions -}] |
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[list_end] [comment {- end enumeration provider_classes }] |
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[list_end] [comment {- end itemized list punk::cap::class groupings -}] |
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[subsection {Namespace punk::cap}] |
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[para] Main punk::cap API for client programs interested in using capability handler packages and associated (registered) provider packages |
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[list_begin definitions] |
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[call [fun capability_exists] [arg capname]] |
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Return a boolean indicating if the named capability exists (0|1) |
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[call [fun capability_has_handler] [arg capname]] |
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Return a boolean indicating if the named capability has a handler package installed (0|1) |
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[call [fun capability_get_handler] [arg capname]] |
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Return the base namespace of the active handler package for the named capability. |
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[para] The base namespace for a handler will always be the package name, but prefixed with :: |
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[list_end] [comment {- end definitions for namespace punk::cap -}] |
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[subsection {Namespace punk::cap::advanced}] |
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[para] punk::cap::advanced API. Functions here are generally not the preferred way to interact with punk::cap. |
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[para] In some cases they may allow interaction in less safe ways or may allow use of features that are unavailable in the base namespace. |
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[para] Some functions are here because they are only marginally or rarely useful, and they are here to keep the base API simple. |
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[list_begin definitions] |
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[call advanced::[fun promote_provider] [arg pkg]] |
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[para]Move the named provider package to the preferred end of the list (tail). |
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[para]The active handler may or may not utilise this for preferencing. See documentation for the specific handler package to confirm. |
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[para] |
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[para] promote/demote doesn't always make a lot of sense .. should preferably be configurable per capapbility for multicap provider pkgs |
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[para]The idea is to provide a crude way to preference/depreference packages independently of order the packages were loaded |
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e.g a caller or cap-handler can ascribe some meaning to the order of the 'providers' key returned from punk::cap::capabilities <capname> |
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[para]The order of providers will be the order the packages were loaded & registered |
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[para]the naming: "promote vs demote" operates on a latest-package-in-list has higher preference assumption (matching last pkg loaded) |
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[para]Each capability handler could and should implement specific preferencing methods within its own API if finer control needed. |
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In some cases the preference/loading order may be inapplicable/irrelevant to a particular capability anyway. |
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[para]As this is just a basic mechanism, which can't support independent per-cap preferencing for multi-cap packages - |
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it only allows putting the pkgs to the head or tail of the lists. |
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[para]Whether particular caps or users of caps do anything with this ordering is dependent on the cap-handler and/or calling code. |
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[call advanced::[fun demote_provider] [arg pkg]] |
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[para]Move the named provider package to the preferred end of the list (tail). |
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[para]The active handler may or may not utilise this for preferencing. See documentation for the specific handler package to confirm. |
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[list_end] |
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[section Internal] |
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[subsection {Namespace punk::cap::capsystem}] |
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[para] Internal functions used to communicate between punk::cap and capability handlers |
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[list_begin definitions] |
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[list_end] |
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[manpage_end] |
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@ -1,23 +0,0 @@ |
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[comment {--- punk::docgen generated from inline doctools comments ---}] |
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[comment {--- punk::docgen DO NOT EDIT DOCS HERE UNLESS YOU REMOVE THESE COMMENT LINES ---}] |
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[comment {--- punk::docgen overwrites this file ---}] |
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[manpage_begin punk::cap 0 0.1.0] |
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[copyright "2023 JMNoble - BSD licensed"] |
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[titledesc {Module API}] |
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[moddesc {punk capabilities plugin system}] |
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[require punk::cap] |
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[description] |
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[list_begin definitions] |
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[call [class interface_caphandler.registry] [method pkg_register] [arg pkg] [arg capname] [arg capdict] [arg fullcapabilitylist]] |
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handler may override and return 0 (indicating don't register)e.g if pkg capdict data wasn't valid |
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overridden handler must be able to handle multiple calls for same pkg - but it may return 1 or 0 as it wishes. |
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[call [class interface_caphandler.registry] [method pkg_unregister] [arg pkg]] |
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[call [class interface_capprovider.registration] [method pkg_unregister] [arg pkg]] |
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[call [class interface_capprovider.provider] [method register] [opt capabilityname_glob]] |
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[call [class interface_capprovider.provider] [method capabilities]] |
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[call [fun exists] [arg capname]] |
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Return a boolean indicating if the named capability exists (0|1) |
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[call [fun has_handler] [arg capname]] |
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Return a boolean indicating if the named capability has a handler package installed (0|1) |
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[list_end] |
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[manpage_end] |
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@ -1,40 +0,0 @@ |
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[comment {--- punk::docgen generated from inline doctools comments ---}] |
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[comment {--- punk::docgen DO NOT EDIT DOCS HERE UNLESS YOU REMOVE THESE COMMENT LINES ---}] |
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[comment {--- punk::docgen overwrites this file ---}] |
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[manpage_begin %pkg% 0 999999.0a1.0] |
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[copyright "%year%"] |
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[titledesc {Module API}] |
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[moddesc {-}] |
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[require %pkg%] |
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[description] |
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++ +++ +++ +++ +++ +++ +++ +++ +++ +++ +++ |
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[section Overview] |
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[para] overview of %pkg% |
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[subsection Concepts] |
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[para] - |
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[subsection dependencies] |
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[para] packages used by %pkg% |
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[list_begin itemized] |
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[item] [package Tcl 8.6] |
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[list_end] |
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[section API] |
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[subsection {Namespace %pkg%::class}] |
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[para] class definitions |
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[list_begin enumerated] |
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[enum] [emph {CLASS interface_sample1}] |
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[list_begin definitions] |
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[call class::[class interface_sample1] [method test] [arg arg1]] |
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[para] test method |
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[list_end] [comment {-- end definitions interface_sample1}] |
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[list_end] [comment {--- end class enumeration ---}] |
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[subsection {Namespace %pkg%}] |
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[para] Core API functions for %pkg% |
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[list_begin definitions] |
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[subsection {Namespace %pkg%::lib}] |
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[para] Secondary functions that are part of the API |
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[list_begin definitions] |
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[list_end] [comment {--- end definitions namespace %pkg%::lib ---}] |
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[section Internal] |
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[subsection {Namespace %pkg%::system}] |
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[para] Internal functions that are not part of the API |
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[manpage_end] |
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