ModulesTest.java 文件源码

/**
 * Basic test of ServiceLoader.load using a custom Layer as the context.
 */
@Test
public void testWithCustomLayer2() {
    ModuleLayer layer = createCustomLayer("bananascript");

    List<ScriptEngineFactory> factories
        = collectAll(ServiceLoader.load(layer, ScriptEngineFactory.class));

    // should have at least 2 x bananascript
    assertTrue(factories.size() >= 2);

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

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