ModulesTest.java 文件源码

/**
 * Basic test of ServiceLoader.load, using the class loader for
 * a module in a custom layer as the context.
 */
@Test
public void testWithCustomLayer1() {
    ModuleLayer layer = createCustomLayer("bananascript");

    ClassLoader loader = layer.findLoader("bananascript");
    List<ScriptEngineFactory> providers
        = collectAll(ServiceLoader.load(ScriptEngineFactory.class, loader));

    // should have at least 2 x bananascript + pearscript
    assertTrue(providers.size() >= 3);

    // first element should be the provider in the custom layer
    ScriptEngineFactory factory = providers.get(0);
    assertTrue(factory.getClass().getClassLoader() == loader);
    assertTrue(factory.getClass().getModule().getLayer() == layer);
    assertTrue(factory.getEngineName().equals("BananaScriptEngine"));

    // remainder should be the boot layer
    providers.remove(0);
    Set<String> names = providers.stream()
            .map(ScriptEngineFactory::getEngineName)
            .collect(Collectors.toSet());
    assertTrue(names.contains("BananaScriptEngine"));
    assertTrue(names.contains("PearScriptEngine"));
}