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An adapter to run Vaadin Flow applications on Vertx

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/*
 * The MIT License
 * Copyright © 2016-2020 Marco Collovati ([email protected])
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.mcollovati.vertx.vaadin.communication;

import java.io.IOException;

import com.vaadin.flow.server.VaadinRequest;
import com.vaadin.flow.server.VaadinResponse;
import com.vaadin.flow.server.VaadinSession;
import com.vaadin.flow.server.communication.UidlRequestHandler;

import com.github.mcollovati.vertx.vaadin.VertxVaadinResponse;

/**
 * A Replacement for {@link UidlRequestHandler} that closes response before
 * session unlock to ensure request messages are sent to the client
 * before push is invoked.
 */
public class VertxUidlRequestHandler extends UidlRequestHandler {

    @Override
    public boolean synchronizedHandleRequest(VaadinSession session, VaadinRequest request, VaadinResponse response)
            throws IOException {
        boolean result = super.synchronizedHandleRequest(session, request, response);
        if (result && response instanceof VertxVaadinResponse) {
            // end request in order to send messages to the client immediately
            // this is manly needed to ensure correct messages order when using push
            ((VertxVaadinResponse) response).end();
        }
        return result;
    }
}