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/*
* @(#)HttpTunnelPush.java 1.10 06/28/07
*/
package com.sun.messaging.jmq.transport.httptunnel.client;
import com.sun.messaging.jmq.transport.httptunnel.HttpTunnelDefaults;
import com.sun.messaging.jmq.transport.httptunnel.HttpTunnelPacket;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Vector;
/**
* This class provides a continuous push thread for sending packets
* from client to server. Pushing a packet can be a time consuming
* task. A dedicated push thread ensures that the threads generating
* outbound packets don't waste their cycles in HTTP I/O.
*/
public class HttpTunnelPush extends Thread implements HttpTunnelDefaults {
private URL pushUrl = null;
private Vector q = null;
private boolean stopThread = false;
private boolean shutdownComplete = false;
public HttpTunnelPush() {
}
/**
* Set the default push URL and start the push thread.
*/
public void startPushThread(URL pushUrl) {
this.pushUrl = pushUrl;
q = new Vector();
setName("HttpTunnelPush");
setDaemon(true);
start();
}
/**
* Terminate the push thread.
*/
public void shutdown() {
synchronized (q) {
stopThread = true;
q.notify();
}
while (!shutdownComplete) {
try {
Thread.sleep(1000);
} catch (Exception e) {
}
}
}
/**
* Adds a packet to the push queue and wakes up the push thread.
* Note that the flow control mechanism automatically limits the
* maximum queue size.
*/
public void sendPacket(HttpTunnelPacket p) {
synchronized (q) {
if (stopThread) { // Don't accept any more packets.
return;
}
q.addElement(p);
q.notify();
}
}
/**
* Sends a packet to a given URL and optionally reads a single
* HttpTunnelPacket from the HTTP response stream.
*/
public HttpTunnelPacket sendPacketDirect(URL u, HttpTunnelPacket p,
boolean getResponse) throws Exception {
URLConnection uc = u.openConnection();
uc.setDoInput(true);
uc.setDoOutput(true);
uc.setUseCaches(false);
uc.setRequestProperty("content-type", "application/octet-stream");
OutputStream os = uc.getOutputStream();
p.writePacket(os);
os.close();
uc.connect();
int response = HttpURLConnection.HTTP_OK;
if (uc instanceof HttpURLConnection) {
response = ((HttpURLConnection) uc).getResponseCode();
} else {
uc.getContentType();
// We don't really need the content type. This just forces
// the uc to do its job.
}
InputStream is = uc.getInputStream();
if (getResponse == false) {
is.close();
return null;
}
if (response != HttpURLConnection.HTTP_OK) {
is.close();
throw new IOException("Failed to receive response");
}
HttpTunnelPacket ret = new HttpTunnelPacket();
ret.readPacket(is);
is.close();
return ret;
}
public void run() {
while (true) {
HttpTunnelPacket p = null;
synchronized (q) {
while (q.isEmpty() && (stopThread == false)) {
try {
q.wait();
} catch (Exception e) {
}
}
if (stopThread && q.isEmpty()) {
break;
}
p = (HttpTunnelPacket) q.elementAt(0);
q.removeElementAt(0);
}
try {
sendPacketDirect(pushUrl, p, false);
} catch (Exception e) {
}
}
shutdownComplete = true;
}
}
/*
* EOF
*/