UndertowHttpChannel.java

/*
 * Copyright 2014-2016 Red Hat, Inc, and individual contributors.
 *
 * 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 org.projectodd.wunderboss.web.undertow.async;

import io.undertow.server.HttpServerExchange;
import io.undertow.server.ServerConnection;
import io.undertow.util.Methods;
import org.projectodd.wunderboss.web.async.OutputStreamHttpChannel;
import org.xnio.XnioExecutor;

import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;

public class UndertowHttpChannel extends OutputStreamHttpChannel {
    public UndertowHttpChannel(final HttpServerExchange exchange,
                               final OnOpen onOpen,
                               final OnError onError,
                               final OnClose onClose) {
        super(Methods.HEAD.equals(exchange.getRequestMethod()), onOpen, onError, onClose);
        this.exchange = exchange.setPersistent(true).dispatch();
        this.exchange.getConnection().addCloseListener(new ServerConnection.CloseListener() {
            @Override
            public void closed(ServerConnection _) {
                notifyClose();
            }
        });
    }

    @Override
    public boolean asyncSendSupported() {
        return true;
    }

    @Override
    public void close() throws IOException {
        try {
            super.close();
        } finally {
            cancelTimeout();
        }
    }

    private boolean cancelTimeout() {
        XnioExecutor.Key key = this.timeoutKey;
        if (key != null) {
            return key.remove();
        }

        return true;
    }

    @Override
    public void setTimeout(long timeout) {
        if (!cancelTimeout()) {
            // the prior timeout has already fired
            return;
        }
        if (timeout > 0) {
            this.timeoutKey = exchange.getIoThread().executeAfter(closer, timeout, TimeUnit.MILLISECONDS);
        }
    }

    @Override
    protected String getResponseCharset() {
        // getResponseCharset claims to return ISO-8859-1 if a charset can't be found,
        // but returns null instead if content-type isn't set
        String charset = this.exchange.getResponseCharset();
        if (charset == null) {
            charset = "ISO-8859-1";
        }

        return charset;
    }

    @Override
    protected void setContentLength(int length) {
        this.exchange.setResponseContentLength(length);
    }

    @Override
    protected OutputStream getOutputStream() {
        return this.exchange.getOutputStream();
    }

    @Override
    protected void execute(Runnable runnable) {
        this.exchange
                .getConnection()
                .getWorker()
                .execute(runnable);
    }

    private final HttpServerExchange exchange;
    private XnioExecutor.Key timeoutKey;
}