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org.netbeans.core.startup/1 1.67.0

Package org.netbeans.core.startup

The IDE's module system is broken into several layers.

See: Description

Package org.netbeans.core.startup Description

The IDE's module system is broken into several layers.

First there is the Open API: org.openide.modules. Relevant classes are ModuleInfo, giving general information about modules (version, name, etc.) and available through lookup; and ModuleInstall, permitting a module to customize its installation within limits.

In this package the remainder of the system is implemented, but this is still broken into pieces to make it easier to work with.

First core.modules.Module is the concrete version of ModuleInfo, with additional information such as the full manifest contents, the live classloader in use, and some details of where it came from and its behavioral parameters.

core.modules.ModuleManager is the class responsible for keeping track of the set of modules and their interdependencies, and ultimately controls which modules can or cannot be installed and why.

core.modules.ModuleInstaller is the interface used by the manager to physically load the contents of the module into the IDE.

core.modules.Events permits major events to be logged asynchronously for subsequent formatting and display.

Private helper classes include ChangeFirer to fire module manager changes, and Util for module-related utility functions. MultiURLClassLoader is an optimized classloader used for modules that is able to handle multiple parents, dynamic parent addition and removal, and streamlining of the package search algorithm based on features of the Modules API. Also the exceptions core.modules.DuplicateException and core.modules.InvalidException are thrown when creating or working with modules.

This layer is largely independent of the workings of the IDE; it uses some Open APIs but only those which can be used in a standalone context. So it makes sense to test these classes in isolation from the others, and without starting the IDE. It is not permitted to use UI and employs no localized messages. (Exception messages need not be localized; problems likely to be encountered by end users who are not module developers should be handled elsewhere are localized.)

The other layer is more dependent on the rest of the IDE core, and the details of the Modules API.

NbInstaller really implements the loading of modules: registering layers, registering the existence of help sets, loading the beans forming manifest sections and making them available, and running ModuleInstall methods.

core.modules.ManifestSection is used by NbInstaller to represent one section in a module manifest during installation, and may be used in other parts of the core (e.g. if sections are registered via lookup for interpretation elsewhere).

core.modules.ModuleList keeps track of the set of installed modules on disk, and is the point of contact for reading and writing the list of installed modules, any serialized ModuleInstall instances, and autoscanning the modules folder.

core.modules.ModuleHistory tracks the origin of a module, whether it was installed before and where, and what version it last was. This information is supplied by ModuleList based on its knowledge of the settings on disk, and used by NbInstaller to invoke the correct ModuleInstall methods.

NbEvents performs NetBeans-specific logging of module system events, such as displaying friendly messages in the splash screen, status bar, or console. It can also be a point of contact for performance measurements.

core.modules.ModuleSystem is a high-level controller for the whole module system. Core initialization classes needing to start some process in the module system, such as "install newly found modules", should use a method call on this class, which will delegate the details to other module-system objects.

core.modules.TestModuleDeployer is a service available via lookup which deploys test modules; accessible separately with a thin API for use by modules such as the API Support.

AutomaticDependencies is used to parse XML files constrained by module-auto-deps-1_0.dtd and automatically update dependencies used by old modules as a result. This is very useful for maintaining backward compatibility across major refactorings.

Also of interest: core.ui.ModuleBean provides a Swing-safe UI wrapper for Module and ModuleManager, used by the Modules node.

Those interested in using the independent parts of the module system as a standalone JAR should run:

ant -f core/build.xml lib-modules
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org.netbeans.core.startup/1 1.67.0