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PubNub is a cross-platform client-to-client (1:1 and 1:many) push service in the cloud, capable of broadcasting real-time messages to millions of web and mobile clients simultaneously, in less than a quarter second!
package com.pubnub.api;
import java.util.Hashtable;
import java.util.Vector;
abstract class Worker implements Runnable {
private Vector _requestQueue;
protected volatile boolean _die;
private Thread thread;
protected HttpClient httpclient;
protected static Logger log = new Logger(Worker.class);
public Thread getThread() {
return thread;
}
void setThread(Thread thread) {
this.thread = thread;
}
void startWorker() {
thread.start();
}
void interruptWorker() {
thread.interrupt();
}
void resetConnection() {
httpclient.reset();
}
Worker(Vector _requestQueue, int connectionTimeout, int requestTimeout, Hashtable headers) {
this._requestQueue = _requestQueue;
this.httpclient = HttpClient.getClient(connectionTimeout,
requestTimeout, headers);
}
void setConnectionTimeout(int timeout) {
if (httpclient != null) {
httpclient.setConnectionTimeout(timeout);
}
}
void setRequestTimeout(int timeout) {
if (httpclient != null) {
httpclient.setRequestTimeout(timeout);
}
}
public abstract void shutdown();
void die() {
_die = true;
}
abstract void process(HttpRequest hreq);
public void run() {
do {
HttpRequest hreq = null;
while (!_die) {
synchronized (_requestQueue) {
if (_requestQueue.size() != 0) {
hreq = (HttpRequest) _requestQueue.firstElement();
_requestQueue.removeElementAt(0);
break;
}
try {
_requestQueue.wait(1000);
} catch (InterruptedException e) {
}
}
}
if (hreq != null) {
if (!_die) {
process(hreq);
}
}
} while (!_die);
shutdown();
}
}
class NonSubscribeWorker extends Worker {
NonSubscribeWorker(Vector _requestQueue, int connectionTimeout,
int requestTimeout, Hashtable headers) {
super(_requestQueue, connectionTimeout, requestTimeout, headers);
}
void process(HttpRequest hreq) {
HttpResponse hresp = null;
try {
log.debug(hreq.getUrl());
hresp = httpclient.fetch(hreq.getUrl(), hreq.getHeaders());
} catch (PubnubException pe) {
log.debug("Pubnub Exception in Fetch : " + pe.getPubnubError());
if (!_die)
hreq.getResponseHandler().handleError(hreq, pe.getPubnubError());
return;
} catch (Exception e) {
log.debug("Exception in Fetch : " + e.toString());
if (!_die)
hreq.getResponseHandler().handleError(hreq, PubnubError.getErrorObject(PubnubError.PNERROBJ_HTTP_ERROR, 2, e.toString()));
return;
}
if (!_die) {
if (hresp == null) {
log.debug("Error in fetching url : " + hreq.getUrl());
hreq.getResponseHandler().handleError(hreq, PubnubError.getErrorObject(PubnubError.PNERROBJ_HTTP_ERROR , 3));
return;
}
hreq.getResponseHandler().handleResponse(hreq, hresp.getResponse());
}
}
public void shutdown() {
if (httpclient != null) httpclient.shutdown();
}
}
abstract class RequestManager {
private static int _maxWorkers = 1;
protected Vector _waiting = new Vector();
protected Worker _workers[];
protected String name;
protected volatile int connectionTimeout;
protected volatile int requestTimeout;
protected Hashtable headers;
private static int count = 0;
protected static Logger log = new Logger(RequestManager.class);
public static int getWorkerCount() {
return _maxWorkers;
}
public abstract Worker getWorker();
private void initManager(int maxCalls, String name) {
if (maxCalls < 1) {
maxCalls = 1;
}
this.name = name;
this.headers = new Hashtable();
_workers = new Worker[maxCalls];
synchronized (_workers) {
for (int i = 0; i < maxCalls; ++i) {
Worker w = getWorker();
w.setThread(new Thread(w, name + "-" + ++count));
_workers[i] = w;
log.verbose("Starting new worker " + _workers[i].getThread().getName());
w.startWorker();
}
}
}
public RequestManager(String name, int connectionTimeout, int requestTimeout) {
this.connectionTimeout = connectionTimeout;
this.requestTimeout = requestTimeout;
initManager(_maxWorkers, name);
}
private void interruptWorkers() {
synchronized (_workers) {
for (int i = 0; i < _workers.length; i++) {
_workers[i].interruptWorker();
}
}
}
class ConnectionResetter implements Runnable {
Worker worker;
ConnectionResetter(Worker w) {
this.worker = w;
}
public void run() {
if (this.worker != null) {
worker.resetConnection();
}
}
}
public void resetWorkers() {
synchronized (_workers) {
for (int i = 0; i < _workers.length; i++) {
log.verbose("Sending DIE to " + _workers[i].getThread().getName());
_workers[i].die();
new Thread(new ConnectionResetter(_workers[i])).start();
_workers[i].interruptWorker();
Worker w = getWorker();
w.setThread(new Thread(w, name + "-" + ++count));
_workers[i] = w;
log.verbose("Starting new worker " + _workers[i].getThread().getName());
w.startWorker();
}
}
}
public void setHeader(String key, String value) {
this.headers.put(key, value);
}
public abstract void clearRequestQueue();
public void resetHttpManager() {
clearRequestQueue();
resetWorkers();
}
public void abortClearAndQueue(HttpRequest hreq) {
resetHttpManager();
queue(hreq);
}
public void queue(HttpRequest hreq) {
log.debug("Queued : " + hreq.getUrl());
synchronized (_waiting) {
_waiting.addElement(hreq);
_waiting.notifyAll();
}
}
public static void setWorkerCount(int count) {
_maxWorkers = count;
}
public void stop() {
synchronized (_workers) {
for (int i = 0; i < _maxWorkers; ++i) {
Worker w = _workers[i];
w.die();
}
}
synchronized (_waiting) {
_waiting.notifyAll();
}
}
}
abstract class AbstractSubscribeManager extends RequestManager {
protected volatile int maxRetries = 5;
protected volatile int retryInterval = 5000;
protected volatile int windowInterval = 0;
public AbstractSubscribeManager(String name, int connectionTimeout,
int requestTimeout) {
super(name, connectionTimeout, requestTimeout);
}
public Worker getWorker() {
return new SubscribeWorker(_waiting,
connectionTimeout, requestTimeout,
maxRetries, retryInterval, windowInterval, headers);
}
public void setMaxRetries(int maxRetries) {
this.maxRetries = maxRetries;
for (int i = 0; i < _workers.length; i++) {
((SubscribeWorker) _workers[i]).setMaxRetries(maxRetries);
}
}
public void setRetryInterval(int retryInterval) {
this.retryInterval = retryInterval;
for (int i = 0; i < _workers.length; i++) {
((SubscribeWorker) _workers[i]).setRetryInterval(retryInterval);
}
}
public void setWindowInterval(int windowInterval) {
this.windowInterval = windowInterval;
for (int i = 0; i < _workers.length; i++) {
((SubscribeWorker) _workers[i]).setWindowInterval(windowInterval);
}
}
public void setConnectionTimeout(int timeout) {
this.connectionTimeout = timeout;
}
public void setRequestTimeout(int timeout) {
this.requestTimeout = timeout;
}
public void queue(HttpRequest hreq) {
synchronized (_waiting) {
clearRequestQueue();
super.queue(hreq);
}
}
}
abstract class AbstractNonSubscribeManager extends RequestManager {
public AbstractNonSubscribeManager(String name, int connectionTimeout,
int requestTimeout) {
super(name, connectionTimeout, requestTimeout);
}
public Worker getWorker() {
return new NonSubscribeWorker(_waiting, connectionTimeout,
requestTimeout, headers);
}
public void setConnectionTimeout(int timeout) {
this.connectionTimeout = timeout;
for (int i = 0; i < _workers.length; i++) {
_workers[i].setConnectionTimeout(timeout);
}
}
public void setRequestTimeout(int timeout) {
this.requestTimeout = timeout;
for (int i = 0; i < _workers.length; i++) {
_workers[i].setRequestTimeout(timeout);
}
}
}
abstract class AbstractSubscribeWorker extends Worker {
protected volatile int maxRetries = 5;
protected volatile int retryInterval = 5000;
protected volatile int windowInterval = 0;
AbstractSubscribeWorker(Vector _requestQueue, int connectionTimeout,
int requestTimeout, int maxRetries, int retryInterval, Hashtable headers) {
super(_requestQueue, connectionTimeout, requestTimeout, headers);
this.maxRetries = maxRetries;
this.retryInterval= retryInterval;
}
AbstractSubscribeWorker(Vector _requestQueue, int connectionTimeout,
int requestTimeout, int maxRetries, int retryInterval, int windowInterval, Hashtable headers) {
super(_requestQueue, connectionTimeout, requestTimeout, headers);
this.maxRetries = maxRetries;
this.retryInterval= retryInterval;
this.windowInterval = windowInterval;
}
public void setMaxRetries(int maxRetries) {
this.maxRetries = maxRetries;
}
public void setRetryInterval(int retryInterval) {
this.retryInterval = retryInterval;
}
public void setWindowInterval(int windowInterval) {
this.windowInterval = windowInterval;
}
}