Examples of org.springframework.aop.TargetSource

org.springframework.aop.TargetSource
A TargetSource is used to obtain the current "target" of an AOP invocation, which will be invoked via reflection if no around advice chooses to end the interceptor chain itself.
If a TargetSource is "static", it will always return the same target, allowing optimizations in the AOP framework. Dynamic target sources can support pooling, hot swapping, etc.
Application developers don't usually need to work with TargetSources directly: this is an AOP framework interface. @author Rod Johnson

  protected TargetSource getCustomTargetSource(Class<?> beanClass, String beanName) {
    // We can't create fancy target sources for directly registered singletons.
    if (this.customTargetSourceCreators != null &&
        this.beanFactory != null && this.beanFactory.containsBean(beanName)) {
      for (TargetSourceCreator tsc : this.customTargetSourceCreators) {
        TargetSource ts = tsc.getTargetSource(beanClass, beanName);
        if (ts != null) {
          // Found a matching TargetSource.
          if (logger.isDebugEnabled()) {
            logger.debug("TargetSourceCreator [" + tsc +
                " found custom TargetSource for bean with name '" + beanName + "'");

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 */
public final class LazyCreationTargetSourceTests {


  @Test
  public void testCreateLazy() {
    TargetSource targetSource = new AbstractLazyCreationTargetSource() {
      @Override
      protected Object createObject() {
        return new InitCountingBean();
      }
      @Override
      public Class<?> getTargetClass() {
        return InitCountingBean.class;
      }
    };


    InitCountingBean proxy = (InitCountingBean) ProxyFactory.getProxy(targetSource);
    assertEquals("Init count should be 0", 0, InitCountingBean.initCount);
    assertEquals("Target class incorrect", InitCountingBean.class, targetSource.getTargetClass());
    assertEquals("Init count should still be 0 after getTargetClass()", 0, InitCountingBean.initCount);


    proxy.doSomething();
    assertEquals("Init count should now be 1", 1, InitCountingBean.initCount);

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    DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
    bf.registerBeanDefinition("ts", tsBd);
    bf.registerBeanDefinition("person", bd);


    TestTargetSource cpts = (TestTargetSource) bf.getBean("ts");
    TargetSource serialized = (TargetSource) SerializationTestUtils.serializeAndDeserialize(cpts);
    assertTrue("Changed to SingletonTargetSource on deserialization",
        serialized instanceof SingletonTargetSource);
    SingletonTargetSource sts = (SingletonTargetSource) serialized;
    assertNotNull(sts.getTarget());
  }

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  /**
   * Creates lazy proxies for the <code>JMXConnector</code> and <code>MBeanServerConnection</code>
   */
  private void createLazyConnection() {
    this.connectorTargetSource = new JMXConnectorLazyInitTargetSource();
    TargetSource connectionTargetSource = new MBeanServerConnectionLazyInitTargetSource();


    this.connector = (JMXConnector)
        new ProxyFactory(JMXConnector.class, this.connectorTargetSource).getProxy(this.beanClassLoader);
    this.connection = (MBeanServerConnection)
        new ProxyFactory(MBeanServerConnection.class, connectionTargetSource).getProxy(this.beanClassLoader);

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      logger.trace("Creating copy of prototype ProxyFactoryBean config: " + this);
    }


    ProxyCreatorSupport copy = new ProxyCreatorSupport(getAopProxyFactory());
    // The copy needs a fresh advisor chain, and a fresh TargetSource.
    TargetSource targetSource = freshTargetSource();
    copy.copyConfigurationFrom(this, targetSource, freshAdvisorChain());
    if (this.autodetectInterfaces && getProxiedInterfaces().length == 0 && !isProxyTargetClass()) {
      // Rely on AOP infrastructure to tell us what interfaces to proxy.
      copy.setInterfaces(
          ClassUtils.getAllInterfacesForClass(targetSource.getTargetClass(), this.beanClassLoader));
    }
    copy.setFrozen(this.freezeProxy);


    if (logger.isTraceEnabled()) {
      logger.trace("Using ProxyCreatorSupport copy: " + copy);

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      }
    }


    proxyFactory.copyFrom(this);


    TargetSource targetSource = createTargetSource(this.target);
    proxyFactory.setTargetSource(targetSource);


    if (this.proxyInterfaces != null) {
      proxyFactory.setInterfaces(this.proxyInterfaces);
    }
    else if (!isProxyTargetClass()) {
      // Rely on AOP infrastructure to tell us what interfaces to proxy.
      proxyFactory.setInterfaces(
          ClassUtils.getAllInterfacesForClass(targetSource.getTargetClass(), this.beanClassLoader));
    }


    this.proxy = getProxy(proxyFactory);
  }

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    }


    // Create proxy here if we have a custom TargetSource.
    // Suppresses unnecessary default instantiation of the target bean:
    // The TargetSource will handle target instances in a custom fashion.
    TargetSource targetSource = getCustomTargetSource(beanClass, beanName);
    if (targetSource != null) {
      this.targetSourcedBeans.add(beanName);
      Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(beanClass, beanName, targetSource);
      Object proxy = createProxy(beanClass, beanName, specificInterceptors, targetSource);
      this.proxyTypes.put(cacheKey, proxy.getClass());

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    // We can't create fancy target sources for directly registered singletons.
    if (this.customTargetSourceCreators != null &&
        this.beanFactory != null && this.beanFactory.containsBean(beanName)) {
      for (int i = 0; i < this.customTargetSourceCreators.length; i++) {
        TargetSourceCreator tsc = this.customTargetSourceCreators[i];
        TargetSource ts = tsc.getTargetSource(beanClass, beanName);
        if (ts != null) {
          // Found a matching TargetSource.
          if (logger.isDebugEnabled()) {
            logger.debug("TargetSourceCreator [" + tsc +
                " found custom TargetSource for bean with name '" + beanName + "'");

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      }
    }


    proxyFactory.copyFrom(this);


    TargetSource targetSource = createTargetSource(this.target);
    proxyFactory.setTargetSource(targetSource);


    if (this.proxyInterfaces != null) {
      proxyFactory.setInterfaces(this.proxyInterfaces);
    }
    else if (!isProxyTargetClass()) {
      // Rely on AOP infrastructure to tell us what interfaces to proxy.
      proxyFactory.setInterfaces(
          ClassUtils.getAllInterfacesForClass(targetSource.getTargetClass(), this.proxyClassLoader));
    }


    this.proxy = proxyFactory.getProxy(this.proxyClassLoader);
  }

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    }


    // Create proxy here if we have a custom TargetSource.
    // Suppresses unnecessary default instantiation of the target bean:
    // The TargetSource will handle target instances in a custom fashion.
    TargetSource targetSource = getCustomTargetSource(beanClass, beanName);
    if (targetSource != null) {
      this.targetSourcedBeans.add(beanName);
      Object[] specificInterceptors = getAdvicesAndAdvisorsForBean(beanClass, beanName, targetSource);
      Object proxy = createProxy(beanClass, beanName, specificInterceptors, targetSource);
      this.proxyTypes.put(cacheKey, proxy.getClass());

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