winsw/doc/extensions/extensions.md

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WinSW extensions
===
Starting from WinSW `2.0`, the wrapper provides an internal extension engine and several extensions.
These extensions allow to alter the behavior of the Windows service in order to setup the required service environment.
### Available extensions
* [Shared Directory Mapper](sharedDirectoriesMapper.md) - Allows mapping shared drives before starting the executable
* [Runaway Process Killer](runawayProcessKiller.md) - Termination of processes started by the previous runs of WinSW
### Developer guide
In WinSW `2.x` the extension does not support inclusion of external extension DLLs.
#### Adding external extensions
The only way to create an external extension is to create a new extension DLL and
then to merge this DLL into the executable using tools like `ILMerge`.
See the example in `src/Core/ServiceWrapper/winsw.csproj`.
Generic extension creation guideline:
* Extension DLL should reference the `WinSWCore` library.
* The extension should extend the `AbstractWinSWExtension` class.
* The extension then can override event handlers offered by the upper class.
* The extension should implement the configuration parsing from the `XmlNode`.
* The extension should support disabling from the configuration file.
WinSW engine will automatically locate your extension using the class name in the [XML Configuration File](../xmlConfigFile.md).
See configuration samples provided for the extensions in the core.
Please note that in the current versions of WinSW `2.x` the binary compatibility of extension APIs *is not guaranteed*.