Examples of org.springframework.context.Lifecycle

org.springframework.context.Lifecycle
Interface defining methods for start/stop lifecycle control. The typical use case for this is to control asynchronous processing.
Can be implemented by both components (typically a Spring bean defined in a Spring {@link org.springframework.beans.factory.BeanFactory}) and containers (typically a Spring {@link ApplicationContext}). Containers will propagate start/stop signals to all components that apply.
Can be used for direct invocations or for management operations via JMX. In the latter case, the {@link org.springframework.jmx.export.MBeanExporter}will typically be defined with an {@link org.springframework.jmx.export.assembler.InterfaceBasedMBeanInfoAssembler}, restricting the visibility of activity-controlled components to the Lifecycle interface.
Note that the Lifecycle interface is only supported on top-level singleton beans. On any other component, the Lifecycle interface will remain undetected and hence ignored. Also, note that the extended {@link SmartLifecycle} interface provides more sophisticatedintegration with the container's startup and shutdown phases. @author Juergen Hoeller @since 2.0 @see SmartLifecycle @see ConfigurableApplicationContext @see org.springframework.jms.listener.AbstractMessageListenerContainer @see org.springframework.scheduling.quartz.SchedulerFactoryBean

   * making sure that any beans that it depends on are started first.
   * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
   * @param beanName the name of the bean to start
   */
  private void doStart(Map lifecycleBeans, String beanName) {
    Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
    if (bean != null) {
      String[] dependenciesForBean = getBeanFactory().getDependenciesForBean(beanName);
      for (int i = 0; i < dependenciesForBean.length; i++) {
        doStart(lifecycleBeans, dependenciesForBean[i]);
      }
      if (!bean.isRunning()) {
        bean.start();
      }
      lifecycleBeans.remove(beanName);
    }
  }

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   * making sure that any beans that depends on it are stopped first.
   * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
   * @param beanName the name of the bean to stop
   */
  private void doStop(Map lifecycleBeans, String beanName) {
    Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
    if (bean != null) {
      String[] dependentBeans = getBeanFactory().getDependentBeans(beanName);
      for (int i = 0; i < dependentBeans.length; i++) {
        doStop(lifecycleBeans, dependentBeans[i]);
      }
      if (bean.isRunning()) {
        bean.stop();
      }
      lifecycleBeans.remove(beanName);
    }
  }

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  //---------------------------------------------------------------------


  public void start() {
    Iterator it = getLifecycleBeans().iterator();
    while (it.hasNext()) {
      Lifecycle lifecycle = (Lifecycle) it.next();
      if (!lifecycle.isRunning()) {
        lifecycle.start();
      }
    }
  }

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  }


  public void stop() {
    Iterator it = getLifecycleBeans().iterator();
    while (it.hasNext()) {
      Lifecycle lifecycle = (Lifecycle) it.next();
      if (lifecycle.isRunning()) {
        lifecycle.stop();
      }
    }
  }

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  }


  public boolean isRunning() {
    Iterator it = getLifecycleBeans().iterator();
    while (it.hasNext()) {
      Lifecycle lifecycle = (Lifecycle) it.next();
      if (!lifecycle.isRunning()) {
        return false;
      }
    }
    return true;
  }

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  }


  public boolean isRunning() {
    Iterator it = getLifecycleBeans().values().iterator();
    while (it.hasNext()) {
      Lifecycle lifecycle = (Lifecycle) it.next();
      if (!lifecycle.isRunning()) {
        return false;
      }
    }
    return true;
  }

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   * making sure that any beans that it depends on are started first.
   * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
   * @param beanName the name of the bean to start
   */
  private void doStart(Map lifecycleBeans, String beanName) {
    Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
    if (bean != null) {
      String[] dependenciesForBean = getBeanFactory().getDependenciesForBean(beanName);
      for (int i = 0; i < dependenciesForBean.length; i++) {
        doStart(lifecycleBeans, dependenciesForBean[i]);
      }
      if (!bean.isRunning()) {
        bean.start();
      }
      lifecycleBeans.remove(beanName);
    }
  }

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   * making sure that any beans that depends on it are stopped first.
   * @param lifecycleBeans Map with bean name as key and Lifecycle instance as value
   * @param beanName the name of the bean to stop
   */
  private void doStop(Map lifecycleBeans, String beanName) {
    Lifecycle bean = (Lifecycle) lifecycleBeans.get(beanName);
    if (bean != null) {
      String[] dependentBeans = getBeanFactory().getDependentBeans(beanName);
      for (int i = 0; i < dependentBeans.length; i++) {
        doStop(lifecycleBeans, dependentBeans[i]);
      }
      if (bean.isRunning()) {
        bean.stop();
      }
      lifecycleBeans.remove(beanName);
    }
  }

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  }


  @Test
  public void singleLifecycleShutdown() throws Exception {
    CopyOnWriteArrayList<Lifecycle> stoppedBeans = new CopyOnWriteArrayList<Lifecycle>();
    Lifecycle bean = new TestLifecycleBean(null, stoppedBeans);
    StaticApplicationContext context = new StaticApplicationContext();
    context.getBeanFactory().registerSingleton("bean", bean);
    context.refresh();
    assertFalse(bean.isRunning());
    bean.start();
    assertTrue(bean.isRunning());
    context.stop();
    assertEquals(1, stoppedBeans.size());
    assertFalse(bean.isRunning());
    assertEquals(bean, stoppedBeans.get(0));
  }

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  }


  @Test
  public void mixedShutdown() throws Exception {
    CopyOnWriteArrayList<Lifecycle> stoppedBeans = new CopyOnWriteArrayList<Lifecycle>();
    Lifecycle bean1 = TestLifecycleBean.forShutdownTests(stoppedBeans);
    Lifecycle bean2 = TestSmartLifecycleBean.forShutdownTests(500, 200, stoppedBeans);
    Lifecycle bean3 = TestSmartLifecycleBean.forShutdownTests(Integer.MAX_VALUE, 100, stoppedBeans);
    Lifecycle bean4 = TestLifecycleBean.forShutdownTests(stoppedBeans);
    Lifecycle bean5 = TestSmartLifecycleBean.forShutdownTests(1, 200, stoppedBeans);
    Lifecycle bean6 = TestSmartLifecycleBean.forShutdownTests(-1, 100, stoppedBeans);
    Lifecycle bean7 = TestSmartLifecycleBean.forShutdownTests(Integer.MIN_VALUE, 300, stoppedBeans);
    StaticApplicationContext context = new StaticApplicationContext();
    context.getBeanFactory().registerSingleton("bean1", bean1);
    context.getBeanFactory().registerSingleton("bean2", bean2);
    context.getBeanFactory().registerSingleton("bean3", bean3);
    context.getBeanFactory().registerSingleton("bean4", bean4);
    context.getBeanFactory().registerSingleton("bean5", bean5);
    context.getBeanFactory().registerSingleton("bean6", bean6);
    context.getBeanFactory().registerSingleton("bean7", bean7);
    context.refresh();
    assertTrue(bean2.isRunning());
    assertTrue(bean3.isRunning());
    assertTrue(bean5.isRunning());
    assertTrue(bean6.isRunning());
    assertTrue(bean7.isRunning());
    assertFalse(bean1.isRunning());
    assertFalse(bean4.isRunning());
    bean1.start();
    bean4.start();
    assertTrue(bean1.isRunning());
    assertTrue(bean4.isRunning());
    context.stop();
    assertFalse(bean1.isRunning());
    assertFalse(bean2.isRunning());
    assertFalse(bean3.isRunning());
    assertFalse(bean4.isRunning());
    assertFalse(bean5.isRunning());
    assertFalse(bean6.isRunning());
    assertFalse(bean7.isRunning());
    assertEquals(7, stoppedBeans.size());
    assertEquals(Integer.MAX_VALUE, getPhase(stoppedBeans.get(0)));
    assertEquals(500, getPhase(stoppedBeans.get(1)));
    assertEquals(1, getPhase(stoppedBeans.get(2)));
    assertEquals(0, getPhase(stoppedBeans.get(3)));

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