/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.servlet.test.upgrade;
import java.io.IOException;
import javax.servlet.ReadListener;
import javax.servlet.ServletException;
import javax.servlet.WriteListener;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpUpgradeHandler;
import javax.servlet.http.WebConnection;
import io.undertow.UndertowLogger;
/**
* Simple upgrade servlet. Because the apache http client does not handle upgrades we keep faking http
* after we upgrade
*
* @author Stuart Douglas
*/
public class AsyncUpgradeServlet extends HttpServlet {
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
req.upgrade(Handler.class);
}
public static class Handler implements HttpUpgradeHandler {
@Override
public void init(final WebConnection wc) {
Listener listener = new Listener(wc);
try {
//we have to set the write listener before the read listener
//otherwise the output stream could be written to before it is
//in async mode
wc.getOutputStream().setWriteListener(listener);
wc.getInputStream().setReadListener(listener);
} catch (IOException e) {
UndertowLogger.REQUEST_IO_LOGGER.ioException(e);
}
}
@Override
public void destroy() {
}
}
private static class Listener implements WriteListener, ReadListener {
private final WebConnection connection;
StringBuilder builder = new StringBuilder();
boolean reading = true;
private Listener(final WebConnection connection) {
this.connection = connection;
}
@Override
public synchronized void onDataAvailable() throws IOException {
byte[] data = new byte[100];
while (connection.getInputStream().isReady()) {
int read;
if ((read = connection.getInputStream().read(data)) != -1) {
builder.append(new String(data, 0, read));
}
if (builder.toString().endsWith("\r\n\r\n")) {
reading = false;
onWritePossible();
}
}
}
@Override
public void onAllDataRead() throws IOException {
}
@Override
public synchronized void onWritePossible() throws IOException {
if(builder.toString().equals("exit\r\n\r\n")) {
try {
connection.close();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
if (reading) {
return;
}
if (connection.getOutputStream().isReady()) {
connection.getOutputStream().write(builder.toString().getBytes());
builder = new StringBuilder();
reading = true;
}
}
@Override
public void onError(final Throwable t) {
}
}
}