Page History
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- To define new (more logical?) structure of where commands are implemented and defined.
- Allow easier use of commands by the App developers.
- Remove command pooling.
- Get rid of the Commons Chain library (see Greg's comment).
Further (future) goals:
- Better documentation (list of commands with description, and for each command a list of parameters).
- Get rid of the Commons Chain library (see Greg's comment).
- Allow commands to be injected.
- Allow configuration-by-code for commands.
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The Previous Status
The above class diagram represents the current distribution of the command classes into the (basic) packages . As we want to get rid of the Admin Interface module, we need to move the MessageCommand
class and the whole tree of the BaseRepositoryCommand
class to the another package(s).
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in the releases up to 4.5.
Implementation
The command classes related to the activation (marked green on the above image) will be were moved to the Activation module (package i.m.module.activation.commands
), the rest will be was moved to the Core module, to the i.m.commands.impl
package.
The CommandsManager
class will be was extended with a method executeCommand(String catalog, String command, Map<String,Object> parameters)
, that will allow allows to run commands without need to handle Context etc. The UI classes (actions etc.) should use command by calling this method (i.e. this will be the preferred method, but not the only one).
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Remove Command Pooling
The pooling capabilities will be were removed from the MgnlCommand
base class, and the CommandsManager
will be has been changed to create new instance for each getCommand()
or executeCommand()
call.
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In most cases it's just a matter of configuration. You define a marker interface extending CommandActionDefinition
and bind CommandActionBase
to it. The CommandActionDefinition will need needs to define at least the name of the command to execute, optionally it can define a catalog which otherwisewill use catalog, otherwise it uses the default value, meaning that the command to be executed will be looked up in the registered default catalog of commands. Further parameters can be added in the param subfolder and/or my subclassing CommandActionDefinition
as the example below illustrates
CommandActionBase provides a Map<String, Object> buildParams(final Node node)
method which builds a map of parameters which will be passed to the current command for execution. It is called by the constructor.
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protected Map<String, Object> buildParams(final Node node) { Map<String, Object> params = super.buildParams(node); params.put(Context.ATTRIBUTE_RECURSIVE, getDefinition().isRecursive()); return params; }
Proposals for future goals (not to be implemented in this sprint):
Getting rid of the Commons Chain library:
New interface Command
(a 'copy' of the one from the Commons Chain library) will be defined in the info.magnolia.commands
package. (Option: simply remove 'implements Command
' from the MgnlCommand
class definition.)
The MgnlCatalog
class will be rewritten to provide the functionality of the org.apache.commons.chain.impl.CatalogBase
class.
This will also require to remove the dependency to org.apache.commons.chain.Context
interface from the interface info.magnolia.context.Context
, and cross-check for this dependency throughout the code.
Allow commands to be injected
TODO
Allow configuration-by-code for commands
TODO
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