初試Guice

最近有空試用了一下Guice,感覺還是比較小巧的，在上面做了個類似Tapestry的Configuration，利用它可以實作類似擴充點的功能。 (可以參考http://tapestry.apache.org/tapestry5/tapestry- ioc/configuration.html)

另外關于網上代碼和XML的配置的問題，個人認為不是問題。基于代碼的配置就象一個核，如果你喜歡基于XML的配置，隻要自己寫一個子產品，讀取XML并使用其中的資訊再用基于代碼的配置去配置即可，隻是基于使用@Inject Annotation 的地方稍微難處理點，但也隻需要動态生成類也可以解決這個問題。

使用的時候參考以下這個測試用例:

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());

    }