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External Dependency Manager for Unity ======== # Overview The External Dependency Manager for Unity (EDM4U) (formerly Play Services Resolver / Jar Resolver) is intended to be used by any Unity plugin that requires: * Android specific libraries (e.g [AARs](https://developer.android.com/studio/projects/android-library.html)). * iOS [CocoaPods](https://cocoapods.org/). * Version management of transitive dependencies. * Management of Package Manager (PM) Registries. Updated releases are available on [GitHub](https://github.com/googlesamples/unity-jar-resolver) # Background Many Unity plugins have dependencies upon Android specific libraries, iOS CocoaPods, and sometimes have transitive dependencies upon other Unity plugins. This causes the following problems: * Integrating platform specific (e.g Android and iOS) libraries within a Unity project can be complex and a burden on a Unity plugin maintainer. * The process of resolving conflicting dependencies on platform specific libraries is pushed to the developer attempting to use a Unity plugin. The developer trying to use your plugin is very likely to give up when faced with Android or iOS specific build errors. * The process of resolving conflicting Unity plugins (due to shared Unity plugin components) is pushed to the developer attempting to use your Unity plugin. In an effort to resolve conflicts, the developer will very likely attempt to resolve problems by deleting random files in your plugin, report bugs when that doesn't work and finally give up. EDM provides solutions for each of these problems. ## Android Dependency Management The *Android Resolver* component of this plugin will download and integrate Android library dependencies and handle any conflicts between plugins that share the same dependencies. Without the Android Resolver, typically Unity plugins bundle their AAR and JAR dependencies, e.g. a Unity plugin `SomePlugin` that requires the Google Play Games Android library would redistribute the library and its transitive dependencies in the folder `SomePlugin/Android/`. When a user imports `SomeOtherPlugin` that includes the same libraries (potentially at different versions) in `SomeOtherPlugin/Android/`, the developer using `SomePlugin` and `SomeOtherPlugin` will see an error when building for Android that can be hard to interpret. Using the Android Resolver to manage Android library dependencies: * Solves Android library conflicts between plugins. * Handles all of the various processing steps required to use Android libraries (AARs, JARs) in Unity 4.x and above projects. Almost all versions of Unity have - at best - partial support for AARs. * (Experimental) Supports minification of included Java components without exporting a project. ## iOS Dependency Management The *iOS Resolver* component of this plugin integrates with [CocoaPods](https://cocoapods.org/) to download and integrate iOS libraries and frameworks into the Xcode project Unity generates when building for iOS. Using CocoaPods allows multiple plugins to utilize shared components without forcing developers to fix either duplicate or incompatible versions of libraries included through multiple Unity plugins in their project. ## Package Manager Registry Setup The [Package Manager](https://docs.unity3d.com/Manual/Packages.html) (PM) makes use of [NPM](https://www.npmjs.com/) registry servers for package hosting and provides ways to discover, install, upgrade and uninstall packages. This makes it easier for developers to manage plugins within their projects. However, installing additional package registries requires a few manual steps that can potentially be error prone. The *Package Manager Resolver* component of this plugin integrates with [PM](https://docs.unity3d.com/Manual/Packages.html) to provide a way to auto-install PM package registries when a `.unitypackage` is installed which allows plugin maintainers to ship a `.unitypackage` that can provide access to their own PM registry server to make it easier for developers to manage their plugins. ## Unity Plugin Version Management Finally, the *Version Handler* component of this plugin simplifies the process of managing transitive dependencies of Unity plugins and each plugin's upgrade process. For example, without the Version Handler plugin, if: * Unity plugin `SomePlugin` includes `EDM4U` plugin at version 1.1. * Unity plugin `SomeOtherPlugin` includes `EDM4U` plugin at version 1.2. The version of `EDM4U` included in the developer's project depends upon the order the developer imports `SomePlugin` or `SomeOtherPlugin`. This results in: * `EDM4U` at version 1.2, if `SomePlugin` is imported then `SomeOtherPlugin` is imported. * `EDM4U` at version 1.1, if `SomeOtherPlugin` is imported then `SomePlugin` is imported. The Version Handler solves the problem of managing transitive dependencies by: * Specifying a set of packaging requirements that enable a plugin at different versions to be imported into a Unity project. * Providing activation logic that selects the latest version of a plugin within a project. When using the Version Handler to manage `EDM4U` included in `SomePlugin` and `SomeOtherPlugin`, from the prior example, version 1.2 will always be the version activated in a developer's Unity project. Plugin creators are encouraged to adopt this library to ease integration for their customers. For more information about integrating EDM4U into your own plugin, see the [Plugin Redistribution](#plugin-redistribution) section of this document. # Analytics The External Dependency Manager for Unity plugin by default logs usage to Google Analytics. The purpose of the logging is to quantitatively measure the usage of functionality, to gather reports on integration failures and to inform future improvements to the developer experience of the External Dependency Manager plugin. Note that the analytics collected are limited to the scope of the EDM4U plugin’s usage. For details of what is logged, please refer to the usage of `EditorMeasurement.Report()` in the source code. # Requirements The *Android Resolver* and *iOS Resolver* components of the plugin only work with Unity version 4.6.8 or higher. The *Version Handler* component only works with Unity 5.x or higher as it depends upon the `PluginImporter` UnityEditor API. The *Package Manager Resolver* component only works with Unity 2018.4 or above, when [scoped registry](https://docs.unity3d.com/Manual/upm-scoped.html) support was added to the Package Manager. # Getting Started Before you import EDM4U into your plugin project, you first need to consider whether you intend to *redistribute* `EDM4U` along with your own plugin. ## Plugin Redistribution If you're a plugin maintainer, redistributing `EDM4U` inside your own plugin will ease the integration process for your users, by resolving dependency conflicts between your plugin and other plugins in a user's project. If you wish to redistribute `EDM4U` inside your plugin, you **must** follow these steps when importing the `external-dependency-manager-*.unitypackage`, and when exporting your own plugin package: 1. Import the `external-dependency-manager-*.unitypackage` into your plugin project by [running Unity from the command line](https://docs.unity3d.com/Manual/CommandLineArguments.html), ensuring that you add the `-gvh_disable` option. 1. Export your plugin by [running Unity from the command line](https://docs.unity3d.com/Manual/CommandLineArguments.html), ensuring that you: - Include the contents of the `Assets/PlayServicesResolver` and `Assets/ExternalDependencyManager` directory. - Add the `-gvh_disable` option. You **must** specify the `-gvh_disable` option in order for the Version Handler to work correctly! For example, the following command will