初试Guice

最近有空试用了一下Guice,感觉还是比较小巧的，在上面做了个类似Tapestry的Configuration，利用它可以实现类似扩展点的功能。 (可以参考http://tapestry.apache.org/tapestry5/tapestry- ioc/configuration.html)

另外关于网上代码和XML的配置的问题，个人认为不是问题。基于代码的配置就象一个核，如果你喜欢基于XML的配置，只要自己写一个模块，读取XML并使用其中的信息再用基于代码的配置去配置即可，只是基于使用@Inject Annotation 的地方稍微难处理点，但也只需要动态生成类也可以解决这个问题。

使用的时候参考以下这个测试用例:

public class GuiceTest extends TestCase {

    public static class ContributorUsingContributorClass extends

            ContributableModule {

        @Override

        protected void configure() {

            contribute(new AbstractContributor() {

                @Inject

                @ConfigFor(AnotherInterface.class)

                OrderedConfiguration<String> orderedConfiguration;

                @Inject

                @ConfigFor(AnotherInterface.class)

                Configuration<String> unorderedConfiguration;

                @Inject

                @ConfigFor(Service.class)

                MappedConfiguration<String, Runnable> configuration;

                @Inject

                public void contribute() {

                    configuration.add("abcd", new Runnable() {

                        public void run() {

                        }

                    });

                    unorderedConfiguration.add("abc");

                    orderedConfiguration.add("my", "abc");

                }

            });

        }

    }

    public void testClient() {

        Injector injector = Guice.createInjector(new MyModule());

        Client client = injector.getInstance(Client.class);

        MockService mock = (MockService) injector.getInstance(Service.class);

        client.go();

        assertTrue(mock.isGone());

    }

    public void testConfigurationThroughContributorClass() {

        Injector injector = Guice.createInjector(new MyModule(),

                new ContributorUsingContributorClass());

        MockService mock = (MockService) injector.getInstance(Service.class);

        Map<String, Runnable> map = mock.getConfigMap();

        assertNotNull(map);

        assertEquals(1, map.size());

    }

    public void testUnorderedConfiguration() {

        Injector injector = Guice.createInjector(new MyModule(),

                new ContributorUsingContributorClass());

        MockService mock = (MockService) injector.getInstance(Service.class);

        Collection<String> config = mock.config;

        assertNotNull(config);

        assertEquals(1, config.size());

        assertEquals("[abc]", config.toString());

    }

    public void testOrderedConfiguration() {

        Injector injector = Guice.createInjector(new MyModule(),

                new ContributorUsingContributorClass());

        MockService mock = (MockService) injector.getInstance(Service.class);

        Collection<String> config = mock.orderedConfig;

        assertNotNull(config);

        assertEquals(1, config.size());

        assertEquals("[abc]", config.toString());

    }