Examples of org.jboss.gravia.runtime.Module

org.jboss.gravia.runtime.Module
An installed module in the Runtime.
A module must have a unique {@link ResourceIdentity} in the Runtime.
Gravia stays out of the business of resolving module's at runtime. Every module has an associated {@link ClassLoader} when it is installed in the runtime already.Modularity must be dealt with in the layer using the Gravia runtime.
For example, a servlet container like Tomcat may choose to create one Module per web application. Multiple modules may share the same class loader or may even all have the same class loader association. This allows GRavia to run on a flat class path (e.g. a plain JUnit test)
When installed it is also assigned a {@code long} identity, chosen by the Runtime.This identity does not change during the lifecycle of a module. Uninstalling and then reinstalling the module creates a new unique {@code long} identity.
A module can be in one of six states:
- {@link State#INSTALLED}
- {@link State#RESOLVED}
- {@link State#STARTING}
- {@link State#ACTIVE}
- {@link State#STOPPING}
- {@link State#UNINSTALLED}
A module should only have active threads of execution when its state is one of {@code STARTING}, {@code ACTIVE}, or {@code STOPPING}. An {@code UNINSTALLED} module can not be set to another state;it can only be reached because references are kept somewhere.
The Runtime is the only entity that is allowed to create {@code Module}objects, and these objects are only valid within the Runtime that created them.
Modules have a natural ordering such that if two {@code Module}s have the same {@link #getModuleId() module id} they are equal. A {@code Module} isless than another {@code Module} if it has a lower {@link #getModuleId() module id} and is greater if it has a higher module id. @author thomas.diesler@jboss.com @since 27-Sep-2013 @ThreadSafe

    }


    @Test
    public void testResourceAccess() throws Exception {
        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        Module module = runtime.getModule(getClass().getClassLoader());
        ModuleContext context = module.getModuleContext();
        ServiceReference<HttpService> sref = context.getServiceReference(HttpService.class);
        HttpService httpService = context.getService(sref);
        String reqspec = "/resource/message.txt";
        try {
            Map<String, String> headers = Collections.singletonMap("Authorization", "Basic " + Base64Encoder.encode("graviaUser:graviaPass"));

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    @Test
    public void testServiceAvailability() throws Exception {


        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        Module modA = runtime.getModule(getClass().getClassLoader());


        ModuleContext ctxA = modA.getModuleContext();
        ServiceReference<ServiceA> srefA = ctxA.getServiceReference(ServiceA.class);
        Assert.assertNotNull("ServiceReference not null", srefA);


        ServiceA srvA = ctxA.getService(srefA);
        Assert.assertEquals("ServiceA#1:ServiceA1#1:Hello", srvA.doStuff("Hello"));

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        }


        // Install the bundle as module if it has not already happened
        // A bundle that could not get resolved will not have an associated module
        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        Module module = runtime.getModule(resid);
        BundleWiring wiring = bundle.adapt(BundleWiring.class);
        if (module == null && wiring != null) {
            try {
                ClassLoader classLoader = wiring.getClassLoader();
                module = runtime.installModule(classLoader, resource, null);

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        // Track installed/uninstalled modules
        ModuleListener listener = new SynchronousModuleListener() {
            @Override
            public void moduleChanged(ModuleEvent event) {
                Module module = event.getModule();
                if (event.getType() == ModuleEvent.INSTALLED) {
                    addRuntimeResource(module.adapt(Resource.class));
                } else if (event.getType() == ModuleEvent.UNINSTALLED) {
                    removeRuntimeResource(module.getIdentity());
                }
            }
        };
        ModuleContext syscontext = runtime.getModuleContext();
        syscontext.addModuleListener(listener);

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        }


        // Install the bundle as module if it has not already happened
        // A bundle that could not get resolved will not have an associated module
        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        Module module = runtime.getModule(identity);
        BundleWiring wiring = bundle.adapt(BundleWiring.class);
        if (module == null && wiring != null) {
            try {
                ClassLoader classLoader = wiring.getClassLoader();
                module = runtime.installModule(classLoader, resource, null);

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                int eventType = event.getType();
                Bundle bundle = event.getBundle();
                if (eventType == BundleEvent.RESOLVED) {
                    installModule(bundle);
                } else if (eventType == BundleEvent.UNINSTALLED) {
                    Module module = getModule(bundle.getBundleId());
                    if (module != null) {
                        uninstallModule(module);
                    }
                }
            }

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        super.uninstallModule(module);
    }


    private Module installModule(Bundle bundle) {


        Module module = getModule(bundle.getBundleId());
        if (module != null)
            return module;


        BundleWiring wiring = bundle.adapt(BundleWiring.class);
        ClassLoader classLoader = wiring != null ? wiring.getClassLoader() : null;

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        // Install the resource as module
        ModuleLoader moduleLoader = org.jboss.modules.Module.getBootModuleLoader();
        ModuleClassLoader classLoader = moduleLoader.loadModule(modid).getClassLoader();
        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        final Module module = runtime.installModule(classLoader, resource, null);


        // Start the module
        module.start();


        Resource modres = module.adapt(Resource.class);
        return new AbstractResourceHandle(modres, module) {
            @Override
            public void uninstall() {
                LOGGER.warn("Cannot uninstall shared resource: {}", getResource());
            }

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            NamedResourceAssociation.removeResource(runtimeName);
        }


        // Install the resource as module if it has not happend already
        Runtime runtime = RuntimeLocator.getRequiredRuntime();
        Module module = runtime.getModule(resource.getIdentity());
        if (module == null) {
            ModuleLoader moduleLoader = injectedServiceModuleLoader.getValue();
            ModuleIdentifier modid = ModuleIdentifier.create(ServiceModuleLoader.MODULE_PREFIX + runtimeName);
            ClassLoader classLoader = moduleLoader.loadModule(modid).getClassLoader();
            module = runtime.installModule(classLoader, resource, null);
        }


        Resource modres = module != null ? module.adapt(Resource.class) : resource;
        return new AbstractResourceHandle(modres, module) {
            @Override
            public void uninstall() {
                try {
                    String deploymentName = wrapper.getDeploymentName();

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        // Install the module
        ModuleClassLoader classLoader = depUnit.getAttachment(Attachments.MODULE).getClassLoader();
        try {
            Runtime runtime = RuntimeLocator.getRequiredRuntime();
            Module module = runtime.installModule(classLoader, resource, headers, context);
            depUnit.putAttachment(GraviaConstants.MODULE_KEY, module);
            depUnit.putAttachment(GraviaConstants.RESOURCE_KEY, module.adapt(Resource.class));
        } catch (ModuleException ex) {
            throw new DeploymentUnitProcessingException(ex);
        }
    }

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