src/main/java/org/efaps/ui/wicket/ConnectionRegistry.java
public void sendKeepAlive(final Application _application)
    {
        final long reference = new Date().getTime();
        final ConcurrentMap<String, IKey> sessionId2key = _application.getMetaData(ConnectionRegistry.SESSION2KEY);
        final ConcurrentMap<String, Long> keepalive = _application.getMetaData(ConnectionRegistry.KEEPALIVE);
        if (keepalive != null) {
            for (final Entry<String, Long> entry : keepalive.entrySet()) {
                if (reference - entry.getValue()
                                > Configuration.getAttributeAsInteger(ConfigAttribute.WEBSOCKET_KATH) * 1000) {
                    final IKey key = sessionId2key.get(entry.getKey());
                    if (key != null) {
                        final IWebSocketConnectionRegistry registry = WebSocketSettings.Holder.get(
                                        _application).getConnectionRegistry();
                        final IWebSocketConnection conn = registry.getConnection(_application, entry.getKey(), key);
                        if (conn != null) {
                            try {
                                conn.sendMessage(KeepAliveBehavior.MSG);
                                ConnectionRegistry.LOG.debug("Send KeepAlive for Session: {}", entry.getKey());
                            } catch (final IOException e) {
                                ConnectionRegistry.LOG.error("Catched error", e);
                            }
                        }
                    }
                }
            }
        }
    }
public void sendKeepAlive(final Application _application)
    {
        final long reference = new Date().getTime();
        final ConcurrentMap<String, IKey> sessionId2key = _application.getMetaData(ConnectionRegistry.SESSION2KEY);
        final ConcurrentMap<String, Long> keepalive = _application.getMetaData(ConnectionRegistry.KEEPALIVE);
        if (keepalive != null) {
            for (final Entry<String, Long> entry : keepalive.entrySet()) {
                if (reference - entry.getValue()
                                > Configuration.getAttributeAsInteger(ConfigAttribute.WEBSOCKET_KATH) * 1000) {
                    final IKey key = sessionId2key.get(entry.getKey());
                    if (key != null) {
                        final IWebSocketConnectionRegistry registry = WebSocketSettings.Holder.get(
                                        _application).getConnectionRegistry();
                        final IWebSocketConnection conn = registry.getConnection(_application, entry.getKey(), key);
                        if (conn != null) {
                            try {
                                conn.sendMessage(KeepAliveBehavior.MSG);
                                ConnectionRegistry.LOG.debug("Send KeepAlive for Session: {}", entry.getKey());
                            } catch (final IOException e) {
                                ConnectionRegistry.LOG.error("Catched error", e);
                            }
                        }
                    }
                }
            }
        }
    }
Send the KeepAlive.
@param _application Application the KeepAlive will be send for