Examples with ServletContextAttributeListener jakarta.servlet.ServletContextAttributeListener used on opensource projects

Example 1 with ServletContextAttributeListener

use of jakarta.servlet.ServletContextAttributeListener in project tomcat by apache.

the class ApplicationContext method removeAttribute.

@Override
public void removeAttribute(String name) {
    Object value = null;
    // Check for read only attribute
    if (readOnlyAttributes.containsKey(name)) {
        return;
    }
    value = attributes.remove(name);
    if (value == null) {
        return;
    }
    // Notify interested application event listeners
    Object[] listeners = context.getApplicationEventListeners();
    if ((listeners == null) || (listeners.length == 0)) {
        return;
    }
    ServletContextAttributeEvent event = new ServletContextAttributeEvent(context.getServletContext(), name, value);
    for (Object obj : listeners) {
        if (!(obj instanceof ServletContextAttributeListener)) {
            continue;
        }
        ServletContextAttributeListener listener = (ServletContextAttributeListener) obj;
        try {
            context.fireContainerEvent("beforeContextAttributeRemoved", listener);
            listener.attributeRemoved(event);
            context.fireContainerEvent("afterContextAttributeRemoved", listener);
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            context.fireContainerEvent("afterContextAttributeRemoved", listener);
            // FIXME - should we do anything besides log these?
            log(sm.getString("applicationContext.attributeEvent"), t);
        }
    }
}

Example 2 with ServletContextAttributeListener

use of jakarta.servlet.ServletContextAttributeListener in project tomcat by apache.

the class StandardContext method listenerStart.

/**
 * Configure the set of instantiated application event listeners
 * for this Context.
 * @return <code>true</code> if all listeners wre
 * initialized successfully, or <code>false</code> otherwise.
 */
public boolean listenerStart() {
    if (log.isDebugEnabled()) {
        log.debug("Configuring application event listeners");
    }
    // Instantiate the required listeners
    String[] listeners = findApplicationListeners();
    Object[] results = new Object[listeners.length];
    boolean ok = true;
    for (int i = 0; i < results.length; i++) {
        if (getLogger().isDebugEnabled()) {
            getLogger().debug(" Configuring event listener class '" + listeners[i] + "'");
        }
        try {
            String listener = listeners[i];
            results[i] = getInstanceManager().newInstance(listener);
        } catch (Throwable t) {
            t = ExceptionUtils.unwrapInvocationTargetException(t);
            ExceptionUtils.handleThrowable(t);
            getLogger().error(sm.getString("standardContext.applicationListener", listeners[i]), t);
            ok = false;
        }
    }
    if (!ok) {
        getLogger().error(sm.getString("standardContext.applicationSkipped"));
        return false;
    }
    // Sort listeners in two arrays
    List<Object> eventListeners = new ArrayList<>();
    List<Object> lifecycleListeners = new ArrayList<>();
    for (Object result : results) {
        if ((result instanceof ServletContextAttributeListener) || (result instanceof ServletRequestAttributeListener) || (result instanceof ServletRequestListener) || (result instanceof HttpSessionIdListener) || (result instanceof HttpSessionAttributeListener)) {
            eventListeners.add(result);
        }
        if ((result instanceof ServletContextListener) || (result instanceof HttpSessionListener)) {
            lifecycleListeners.add(result);
        }
    }
    // Listener instances may have been added directly to this Context by
    // ServletContextInitializers and other code via the pluggability APIs.
    // Put them these listeners after the ones defined in web.xml and/or
    // annotations then overwrite the list of instances with the new, full
    // list.
    eventListeners.addAll(Arrays.asList(getApplicationEventListeners()));
    setApplicationEventListeners(eventListeners.toArray());
    for (Object lifecycleListener : getApplicationLifecycleListeners()) {
        lifecycleListeners.add(lifecycleListener);
        if (lifecycleListener instanceof ServletContextListener) {
            noPluggabilityListeners.add(lifecycleListener);
        }
    }
    setApplicationLifecycleListeners(lifecycleListeners.toArray());
    if (getLogger().isDebugEnabled()) {
        getLogger().debug("Sending application start events");
    }
    // Ensure context is not null
    getServletContext();
    context.setNewServletContextListenerAllowed(false);
    Object[] instances = getApplicationLifecycleListeners();
    if (instances == null || instances.length == 0) {
        return ok;
    }
    ServletContextEvent event = new ServletContextEvent(getServletContext());
    ServletContextEvent tldEvent = null;
    if (noPluggabilityListeners.size() > 0) {
        noPluggabilityServletContext = new NoPluggabilityServletContext(getServletContext());
        tldEvent = new ServletContextEvent(noPluggabilityServletContext);
    }
    for (Object instance : instances) {
        if (!(instance instanceof ServletContextListener)) {
            continue;
        }
        ServletContextListener listener = (ServletContextListener) instance;
        try {
            fireContainerEvent("beforeContextInitialized", listener);
            if (noPluggabilityListeners.contains(listener)) {
                listener.contextInitialized(tldEvent);
            } else {
                listener.contextInitialized(event);
            }
            fireContainerEvent("afterContextInitialized", listener);
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            fireContainerEvent("afterContextInitialized", listener);
            getLogger().error(sm.getString("standardContext.listenerStart", instance.getClass().getName()), t);
            ok = false;
        }
    }
    return ok;
}

Example 3 with ServletContextAttributeListener

use of jakarta.servlet.ServletContextAttributeListener in project tomcat by apache.

the class ApplicationContext method setAttribute.

@Override
public void setAttribute(String name, Object value) {
    // Name cannot be null
    if (name == null) {
        throw new NullPointerException(sm.getString("applicationContext.setAttribute.namenull"));
    }
    // Null value is the same as removeAttribute()
    if (value == null) {
        removeAttribute(name);
        return;
    }
    // Check for read only attribute
    if (readOnlyAttributes.containsKey(name)) {
        return;
    }
    Object oldValue = attributes.put(name, value);
    boolean replaced = oldValue != null;
    // Notify interested application event listeners
    Object[] listeners = context.getApplicationEventListeners();
    if ((listeners == null) || (listeners.length == 0)) {
        return;
    }
    ServletContextAttributeEvent event = null;
    if (replaced) {
        event = new ServletContextAttributeEvent(context.getServletContext(), name, oldValue);
    } else {
        event = new ServletContextAttributeEvent(context.getServletContext(), name, value);
    }
    for (Object obj : listeners) {
        if (!(obj instanceof ServletContextAttributeListener)) {
            continue;
        }
        ServletContextAttributeListener listener = (ServletContextAttributeListener) obj;
        try {
            if (replaced) {
                context.fireContainerEvent("beforeContextAttributeReplaced", listener);
                listener.attributeReplaced(event);
                context.fireContainerEvent("afterContextAttributeReplaced", listener);
            } else {
                context.fireContainerEvent("beforeContextAttributeAdded", listener);
                listener.attributeAdded(event);
                context.fireContainerEvent("afterContextAttributeAdded", listener);
            }
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            if (replaced) {
                context.fireContainerEvent("afterContextAttributeReplaced", listener);
            } else {
                context.fireContainerEvent("afterContextAttributeAdded", listener);
            }
            // FIXME - should we do anything besides log these?
            log(sm.getString("applicationContext.attributeEvent"), t);
        }
    }
}