Examples with HttpSessionAttributeListener javax.servlet.http.HttpSessionAttributeListener used on opensource projects

Example 1 with HttpSessionAttributeListener

use of javax.servlet.http.HttpSessionAttributeListener 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
    ArrayList<Object> eventListeners = new ArrayList<>();
    ArrayList<Object> lifecycleListeners = new ArrayList<>();
    for (int i = 0; i < results.length; i++) {
        if ((results[i] instanceof ServletContextAttributeListener) || (results[i] instanceof ServletRequestAttributeListener) || (results[i] instanceof ServletRequestListener) || (results[i] instanceof HttpSessionIdListener) || (results[i] instanceof HttpSessionAttributeListener)) {
            eventListeners.add(results[i]);
        }
        if ((results[i] instanceof ServletContextListener) || (results[i] instanceof HttpSessionListener)) {
            lifecycleListeners.add(results[i]);
        }
    }
    // list.
    for (Object eventListener : getApplicationEventListeners()) {
        eventListeners.add(eventListener);
    }
    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 (int i = 0; i < instances.length; i++) {
        if (!(instances[i] instanceof ServletContextListener))
            continue;
        ServletContextListener listener = (ServletContextListener) instances[i];
        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", instances[i].getClass().getName()), t);
            ok = false;
        }
    }
    return (ok);
}

Example 2 with HttpSessionAttributeListener

use of javax.servlet.http.HttpSessionAttributeListener in project tomcat by apache.

the class StandardSessionContext method setAttribute.

/**
     * Bind an object to this session, using the specified name.  If an object
     * of the same name is already bound to this session, the object is
     * replaced.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueBound()</code> on the object.
     *
     * @param name Name to which the object is bound, cannot be null
     * @param value Object to be bound, cannot be null
     * @param notify whether to notify session listeners
     * @exception IllegalArgumentException if an attempt is made to add a
     *  non-serializable object in an environment marked distributable.
     * @exception IllegalStateException if this method is called on an
     *  invalidated session
     */
public void setAttribute(String name, Object value, boolean notify) {
    // Name cannot be null
    if (name == null)
        throw new IllegalArgumentException(sm.getString("standardSession.setAttribute.namenull"));
    // Null value is the same as removeAttribute()
    if (value == null) {
        removeAttribute(name);
        return;
    }
    // Validate our current state
    if (!isValidInternal()) {
        throw new IllegalStateException(sm.getString("standardSession.setAttribute.ise", getIdInternal()));
    }
    if ((manager != null) && manager.getContext().getDistributable() && !isAttributeDistributable(name, value) && !exclude(name, value)) {
        throw new IllegalArgumentException(sm.getString("standardSession.setAttribute.iae", name));
    }
    // Construct an event with the new value
    HttpSessionBindingEvent event = null;
    // Call the valueBound() method if necessary
    if (notify && value instanceof HttpSessionBindingListener) {
        // Don't call any notification if replacing with the same value
        Object oldValue = attributes.get(name);
        if (value != oldValue) {
            event = new HttpSessionBindingEvent(getSession(), name, value);
            try {
                ((HttpSessionBindingListener) value).valueBound(event);
            } catch (Throwable t) {
                manager.getContext().getLogger().error(sm.getString("standardSession.bindingEvent"), t);
            }
        }
    }
    // Replace or add this attribute
    Object unbound = attributes.put(name, value);
    // Call the valueUnbound() method if necessary
    if (notify && (unbound != null) && (unbound != value) && (unbound instanceof HttpSessionBindingListener)) {
        try {
            ((HttpSessionBindingListener) unbound).valueUnbound(new HttpSessionBindingEvent(getSession(), name));
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            manager.getContext().getLogger().error(sm.getString("standardSession.bindingEvent"), t);
        }
    }
    if (!notify)
        return;
    // Notify interested application event listeners
    Context context = manager.getContext();
    Object[] listeners = context.getApplicationEventListeners();
    if (listeners == null)
        return;
    for (int i = 0; i < listeners.length; i++) {
        if (!(listeners[i] instanceof HttpSessionAttributeListener))
            continue;
        HttpSessionAttributeListener listener = (HttpSessionAttributeListener) listeners[i];
        try {
            if (unbound != null) {
                context.fireContainerEvent("beforeSessionAttributeReplaced", listener);
                if (event == null) {
                    event = new HttpSessionBindingEvent(getSession(), name, unbound);
                }
                listener.attributeReplaced(event);
                context.fireContainerEvent("afterSessionAttributeReplaced", listener);
            } else {
                context.fireContainerEvent("beforeSessionAttributeAdded", listener);
                if (event == null) {
                    event = new HttpSessionBindingEvent(getSession(), name, value);
                }
                listener.attributeAdded(event);
                context.fireContainerEvent("afterSessionAttributeAdded", listener);
            }
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            try {
                if (unbound != null) {
                    context.fireContainerEvent("afterSessionAttributeReplaced", listener);
                } else {
                    context.fireContainerEvent("afterSessionAttributeAdded", listener);
                }
            } catch (Exception e) {
            // Ignore
            }
            manager.getContext().getLogger().error(sm.getString("standardSession.attributeEvent"), t);
        }
    }
}

Example 3 with HttpSessionAttributeListener

use of javax.servlet.http.HttpSessionAttributeListener in project tomcat by apache.

the class StandardSessionContext method removeAttributeInternal.

/**
     * Remove the object bound with the specified name from this session.  If
     * the session does not have an object bound with this name, this method
     * does nothing.
     * <p>
     * After this method executes, and if the object implements
     * <code>HttpSessionBindingListener</code>, the container calls
     * <code>valueUnbound()</code> on the object.
     *
     * @param name Name of the object to remove from this session.
     * @param notify Should we notify interested listeners that this
     *  attribute is being removed?
     */
protected void removeAttributeInternal(String name, boolean notify) {
    // Avoid NPE
    if (name == null)
        return;
    // Remove this attribute from our collection
    Object value = attributes.remove(name);
    // Do we need to do valueUnbound() and attributeRemoved() notification?
    if (!notify || (value == null)) {
        return;
    }
    // Call the valueUnbound() method if necessary
    HttpSessionBindingEvent event = null;
    if (value instanceof HttpSessionBindingListener) {
        event = new HttpSessionBindingEvent(getSession(), name, value);
        ((HttpSessionBindingListener) value).valueUnbound(event);
    }
    // Notify interested application event listeners
    Context context = manager.getContext();
    Object[] listeners = context.getApplicationEventListeners();
    if (listeners == null)
        return;
    for (int i = 0; i < listeners.length; i++) {
        if (!(listeners[i] instanceof HttpSessionAttributeListener))
            continue;
        HttpSessionAttributeListener listener = (HttpSessionAttributeListener) listeners[i];
        try {
            context.fireContainerEvent("beforeSessionAttributeRemoved", listener);
            if (event == null) {
                event = new HttpSessionBindingEvent(getSession(), name, value);
            }
            listener.attributeRemoved(event);
            context.fireContainerEvent("afterSessionAttributeRemoved", listener);
        } catch (Throwable t) {
            ExceptionUtils.handleThrowable(t);
            try {
                context.fireContainerEvent("afterSessionAttributeRemoved", listener);
            } catch (Exception e) {
            // Ignore
            }
            manager.getContext().getLogger().error(sm.getString("standardSession.attributeEvent"), t);
        }
    }
}

Example 4 with HttpSessionAttributeListener

use of javax.servlet.http.HttpSessionAttributeListener in project jetty.project by eclipse.

the class SessionHandler method doSessionAttributeListeners.

public void doSessionAttributeListeners(Session session, String name, Object old, Object value) {
    if (!_sessionAttributeListeners.isEmpty()) {
        HttpSessionBindingEvent event = new HttpSessionBindingEvent(session, name, old == null ? value : old);
        for (HttpSessionAttributeListener l : _sessionAttributeListeners) {
            if (old == null)
                l.attributeAdded(event);
            else if (value == null)
                l.attributeRemoved(event);
            else
                l.attributeReplaced(event);
        }
    }
}