Question

我有一个使用JavaFX 2的应用程序，我想确保在接口的每个方法中调用特定的代码：

public interface IControladorDialogoPrincipal extends IControladorDialogo{
    @FXML
    void abrirCaixa(ActionEvent e);

    @FXML
    void fecharCaixa(ActionEvent e);

    @FXML
    void novaPreVenda(ActionEvent evento);

    @FXML
    void mesclarPreVenda(ActionEvent evento);
}

这是实现上述接口的类的一部分：

public class ControladorDialogoPrincipal extends ControladorDialogoSubmeter implements IProcessamentoListener, IControladorDialogoPrincipal {

    @FXML
    private StackPane painelPrincipal;
    @FXML
    private BorderPane painelConteudo;
    @FXML
    private BorderPane painelProgresso;
    @Autowired
    private ControladorExecucaoTarefa controladorExecucaoTarefa;
    @Autowired
    private ControladorDialogoMensagem dialogoMensagem;
    @Autowired
    private RecuperadorBeanSpring recuperadorBean;

    @Override
    protected void configurarElementos() {
        stage.setOnCloseRequest(new EventHandler<WindowEvent>() {
            public void handle(WindowEvent e) {
                System.exit(0);
            }
        });
        stage.setWidth(800);
        stage.setHeight(600);
        painelProgresso.toBack();
        painelProgresso.setVisible(false);
    }
    .
    .
    .
}

所有ControladorDialogo *的基类都是这个抽象类：

public abstract class ControladorDialogo implements IControladorDialogo {

    private URL modelo;
    protected Stage stage;
    protected String titulo = "";
    protected List<String> estilos = new ArrayList<String>();
    protected Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    public final void init() {
        try {
            stage = new Stage();
            definirTitulo(titulo);
            stage.setScene(carregarCena());
            stage.initModality(Modality.WINDOW_MODAL);
            configurarElementos();
        } catch (IOException e) {
            logger.error("Erro ao tentar carregar arquivo FXML: ", e);
        }
    }

    protected final Scene carregarCena() throws IOException {
        Parent root = (Parent) SpringFXMLLoader.load(modelo.openStream(), this);
        Scene cena = new Scene(root);
        cena.getStylesheets().addAll(estilos);
        return cena;
    }

    protected void configurarElementos() {
    }

    protected void definirTitulo(String titulo) {
        if (stage != null) {
            this.titulo = titulo;
            stage.setTitle(titulo);
        }
    }

    @Override
    public void abrir() {
        stage.show();
    }

    @Override
    public void fechar() {
        stage.close();
    }

    @Override
    public void setModelo(URL modelo) {
        this.modelo = modelo;
    }

    @Override
    public void setEstilos(List<String> estilos) {
        this.estilos = estilos;
    }
}

这是Spring的aop配置和ControladorDialogoPrincipal bean的实例化：

<bean id="controladorDialogoPrincipal" class="com.hrgi.pdv.controladores.gui.dialogos.ControladorDialogoPrincipal"
      init-method="init">
    <property name="modelo" value="classpath:gui/dialogoPrincipal.fxml"/>
    <property name="estilos" ref="estilos"/>
</bean>

<util:list id="estilos" list-class="java.util.ArrayList">
    <value>/css/preVenda.css</value>
</util:list>

<aop:config>
    <aop:aspect ref="dataSource">
        <aop:pointcut id="todosOsMetodosIControladorDialogoPrincipal" expression="execution(* com.hrgi.pdv.controladores.gui.dialogos.IControladorDialogoPrincipal.*(..))"/>
        <aop:before method="travarConexao" pointcut-ref="todosOsMetodosIControladorDialogoPrincipal"/>
    </aop:aspect>
</aop:config>

我想调用此类的方法“travarConexao”：

public class RoutingDataSource extends AbstractRoutingDataSource implements Runnable {
    .
    .
    .
    private void definirConexaoAtual() {
        if (conexaoTravada && conexaoAtual.equalsIgnoreCase("secundario"))
            return;
        DataSource principal = (DataSource) fontesDeDados.get("principal");
        if (verificarConexao(principal)) {
            synchronized (conexaoAtual) {
                conexaoAtual = "principal";
            }
        } else {
            synchronized (conexaoAtual) {
                conexaoAtual = "secundario";
            }
        }
    }

    private boolean verificarConexao(DataSource principal) {
        try {
            Connection conexao = principal.getConnection();
            Statement statement = conexao.createStatement();
            return statement.executeQuery("SELECT 1") != null;
        } catch (Exception e) {
            return false;
        }
    }

    public void travarConexao() {
        System.out.println("\n\ncalled!!\n\n");
        definirTravaDeConexao(true);
    }

    private void definirTravaDeConexao(Boolean trava) {
        synchronized (conexaoTravada) {
            conexaoTravada = trava;
        }
        definirConexaoAtual();
    }
    .
    .
    .
}

有人可以解释一下为什么从未调用此方法吗？

Answer 1

在某些情况下，您无法使Spring AOP与JavaFX 2协同工作，因为JavaFX 2组件使用许多内部最终类，并且您无法有效地在CGLIB或Javassist中注入代理。实际上我没有尝试过AspectJ，但我相信这是同样的问题。

总而言之，如果你试图拦截一个自定义JavaFX组件内的方法（例如扩展GridPane），你将无法做到（或者你很幸运，但它不会适用于所有方法。）

如果您试图通过JavaFX控制器（不扩展javafx类）拦截方法，请确保Spring通过其上下文知道控制器（检查Spring JavaFX集成）。最后，如果没问题，请尝试使用CGLIB：

<aop:config proxy-target-class="false"/>
<aop:aspectj-autoproxy proxy-target-class="false"/>

Answer 2

问题是配置不佳。在注意到我尝试过的切入点都没有工作（既不是最简单的）之后，我用Spring将纯Spring AOP改为AspectJ：

<aop:aspectj-autoproxy/>
<context:spring-configured/>

<bean class="com.hrgi.pdv.InterceptadorTravamentoConexao" scope="prototype">
    <property name="routingDataSource" ref="dataSource"/>
</bean>

切入点被移动到特定新类中的注释：

@Aspect
@Configurable
public class InterceptadorTravamentoConexao {

    private RoutingDataSource routingDataSource;

    @Before("execution(* com.hrgi.pdv.controladores.gui.dialogos.IControladorDialogoPrincipal.*(..))")
    public void travarConexao(){
        routingDataSource.travarConexao();
    }

    public void setRoutingDataSource(RoutingDataSource routingDataSource) {
        this.routingDataSource = routingDataSource;
    }
}

在maven中为aspectj-compiler添加了一些配置：

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>aspectj-maven-plugin</artifactId>
    <version>1.4</version>
    <configuration>
        <showWeaveInfo>true</showWeaveInfo>
        <source>1.7</source>
        <target>1.7</target>
        <Xlint>ignore</Xlint>
        <complianceLevel>1.7</complianceLevel>
        <encoding>UTF-8</encoding>
        <verbose>true</verbose>
        <aspectLibraries>
            <aspectLibrary>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aspects</artifactId>
            </aspectLibrary>
        </aspectLibraries>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>compile</goal>
                <goal>test-compile</goal>
            </goals>
        </execution>
    </executions>
    <dependencies>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjtools</artifactId>
            <version>1.7.3</version>
        </dependency>
    </dependencies>
</plugin>

现在它正在运作。

无法用Spring跳过拦截切入点

2 个答案: