/*
* Copyright 2009-2013 Scale Unlimited
*
* 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 bixo.fetcher;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.http.HttpException;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
public class RandomResponseHandler extends AbstractHandler {
private static final long DEFAULT_DURATION = 1000L;
private int _length;
private long _duration;
private Random _rand;
/**
* Create an HTTP response handler that sends random data back at a particular rate.
*
* @param length - number of bytes to return
* @param duration - duration for response, in milliseconds.
*/
public RandomResponseHandler(int length, long duration) {
_length = length;
_duration = duration;
_rand = new Random();
}
/**
* Send back <length> bytes of random data in one second.
*
* @param length - number of bytes to return
*/
public RandomResponseHandler(int length) {
this(length, DEFAULT_DURATION);
}
@Override
public void handle(String pathInContext, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws HttpException, IOException {
response.setContentLength(_length);
response.setContentType("text/html");
response.setStatus(200);
OutputStream os = response.getOutputStream();
long startTime = System.currentTimeMillis();
byte[] bytes = new byte[1];
try {
for (long i = 0; i < _length; i++) {
_rand.nextBytes(bytes);
os.write(bytes[0]);
// Given i/_length as % of data written, we know that
// this * duration is the target elapsed time. Figure out
// how much to delay to make it so.
long curTime = System.currentTimeMillis();
long elapsedTime = curTime - startTime;
long targetTime = (i * _duration) / _length;
if (elapsedTime < targetTime) {
Thread.sleep(targetTime - elapsedTime);
}
}
} catch (InterruptedException e) {
throw new HttpException(500, "Response handler interrupted");
}
}
}