/*
* Copyright 2000-2016 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.server;
import java.io.Serializable;
/**
* Event listener that can be registered to a {@link VaadinService} to get an
* event when a new Vaadin service session is initialized for that service.
* <p>
* Because of the way different service instances share the same session, the
* listener is not necessarily notified immediately when the session is created
* but only when the first request for that session is handled by a specific
* service.
*
* @see VaadinService#addSessionInitListener(SessionInitListener)
*
* @author Vaadin Ltd
* @since 7.0.0
*/
@FunctionalInterface
public interface SessionInitListener extends Serializable {
/**
* Invoked when a new Vaadin service session is initialized for that
* service.
* <p>
* Because of the way different service instances share the same session,
* the listener is not necessarily notified immediately when the session is
* created but only when the first request for that session is handled by a
* specific service.
*
* @param event
* the initialization event
* @throws ServiceException
* a problem occurs when processing the event
*/
public void sessionInit(SessionInitEvent event) throws ServiceException;
}