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git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/branches/ZeroRadiant@190 8a3a26a2-13c4-0310-b231-cf6edde360e5
85 lines
3.9 KiB
Text
85 lines
3.9 KiB
Text
Release / Reload of modules
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---------------------------
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The 'not active' modules are unloaded after startup
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Plugins should be allowed to be unloaded and reloaded on the fly
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Modules too, when possible?
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Don't want to 'force' all plugins to have unload capabilities
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Just has to be something specified at compile time wether or not they can unload 'cleanly'
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Dependency implications. When you release a module, you need to remove a number of interfaces.
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If those interfaces are being used, can you explicitely ask for them to be unloaded?
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Also, problem with plugins breaking the startup process:
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http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=441
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The most important is to provide a clean shutdown method
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What's the != between unload and shutdown?
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Means that the server proceeds to the shutdown, and nothing else is supposed to be making
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calls through APIs post shutdown.
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Should be done in 3 steps:
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#1 prepare shutdown, all APIs are active, just release and save all the stuff you want
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#2 tell the modules to shutdown, i.e. release the APIs they point to? (at this point they can't call through anymore)
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#3 force all things to be unloaded, warn about reference count problems
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What is different when we unload a module, and we want to keep the editor up?
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All the interfaces obtained from this plugin need to be released
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If some pure virtual classes have been obtained from this plugin, we need a mecanism to have them removed
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Do we need a first path to check if the unload procedure is going to be allowed?
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For instance, a plugin that provides custom entities rendering etc.
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Need to unload first, then need to reload (scan the map again, rebuild)
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Summing up, when doing a reload we need to keep track of the modules and let them know after the
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module has been reloaded, so that the links can be rebuilt. When doing unload we need to do a
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'check' pass prior to anything to know if the release is possible. Because it does not depend
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on the module we unload, it depends on the other clients that use it.
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Objectives:
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-----------
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- 'release check' of a module
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walk through the interfaces this module has provided, and make sure the release will be possible
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- 'release' of a module
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actually drop all the interfaces. this should be done only after a 'release check'
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if something fails here, we are in an unstable state and need to abort
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- 'client shutdown' unused modules after initial startup
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actual DLL unload / complete shutdown of the client interface
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this comes after 'release check' and 'release'
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- 'refresh' modules
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'release check', 'release', 'shutdown' and then, reload and build the links again
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- 'core shutdown'
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'release' and force 'shutdown' of all clients
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even if we encounter some interfaces that we are not able to release cleanly
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force things and shutdown all clients
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then the core process is ready to exit..
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Constraints:
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------------
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- refresh and shutdown are sharing some code
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- the 'release' part of a module refresh may not be always possible (that's what 'release check' is there for)
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- 'core shutdown' has to be forced to happen, in the safest way possible obviously
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Implementation:
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---------------
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- 'client shutdown' comes first
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this is used after initial startup, since we don't have to do a prior 'release' on those
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this will be used in the 'core shutdown' and 'refresh' too
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- then 'core shutdown' procedure?
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that's the most urgent thing we need
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but 'release check' and 'release' have to be written in and used during 'core shutdown'
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- 'refresh' takes an essential part of the design, but that's not something we need to have written right now?
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(it mostly relies on 'release check' 'release' 'client shutdown', and then reload and rebuild the links)
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'client shutdown':
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this is server side code though, you tell the server 'shutdown this client'
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we don't have to exchange anything with the client while we do that
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(written initially for unload of unused modules after startup)
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'core shutdown':
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is a shutdown of all clients
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