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package org.atmosphere.gwt.client.extra;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.GwtEvent.Type;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.event.shared.SimpleEventBus;
import com.google.gwt.user.client.Timer;
/**
*
* @author p.havelaar
*/
public class WindowSocket {
public static class MessageEvent extends GwtEvent<MessageHandler> {
private static Type TYPE;
private String message;
public static Type getType() {
return TYPE != null ? TYPE : (TYPE = new Type());
}
public MessageEvent(String message) {
this.message = message;
}
@Override
public Type<MessageHandler> getAssociatedType() {
return getType();
}
@Override
protected void dispatch(MessageHandler handler) {
handler.onMessage(message);
}
}
public static interface MessageHandler extends EventHandler {
public void onMessage(String message);
}
public static boolean exists(Window w, String socketName) {
return getSocket(w, socketName) != null;
}
public static void post(Window w, String socketName, String message) {
SocketImpl s = getSocket(w, socketName);
if (s != null) {
s.post(message);
}
}
public void bind(String name) {
unbind();
Window w = Window.current();
socket = getSocket(w, name);
if (socket == null) {
Sockets sockets = w.getObject("sockets");
if (sockets == null) {
sockets = Sockets.create();
w.set("sockets", sockets);
}
socket = SocketImpl.create(name);
sockets.set(socket, name);
}
queueTimer.scheduleRepeating(250);
}
public void unbind() {
if (socket != null) {
Sockets sockets = Window.current().getObject("sockets");
sockets.remove(socket);
queueTimer.cancel();
// run once to empty queue
queueTimer.run();
socket = null;
}
}
public HandlerRegistration addHandler(MessageHandler handler) {
return listeners.addHandler(MessageEvent.getType(), handler);
}
private static SocketImpl getSocket(Window w, String name) {
Sockets sockets = w.getObject("sockets");
if (sockets == null) {
return null;
}
return sockets.get(name);
}
private SocketImpl socket;
private EventBus listeners = new SimpleEventBus();
private Timer queueTimer = new Timer() {
@Override
public void run() {
if (socket != null) {
String m;
while ((m = socket.poll()) != null) {
listeners.fireEvent(new MessageEvent(m));
}
}
}
};
private final static class SocketImpl extends JavaScriptObject {
private static native SocketImpl create(String xname) /*-{
return {
messages: null,
last: null,
name: xname
};
}-*/;
public native void post(String message) /*-{
var head = this.messages;
var msg = { };
msg.next = null;
msg.value = message;
this.last = msg;
if (head != null) {
head.next = msg;
} else {
this.messages = msg;
}
}-*/;
public native String poll() /*-{
if (this.messages == null) {
return null;
}
var msg = this.messages;
this.messages = msg.next;
if (this.messages == null) {
this.last = null;
}
return msg.value;
}-*/;
protected SocketImpl() {
}
}
private final static class Sockets extends JavaScriptObject {
public static native Sockets create() /*-{
return {
sockets: {}
};
}-*/;
public native SocketImpl set(SocketImpl socket, String name) /*-{
var t = this.sockets[name];
this.sockets[name] = socket;
return t;
}-*/;
public native SocketImpl get(String name) /*-{
return this.sockets[name];
}-*/;
public native void remove(SocketImpl socket) /*-{
this.sockets[socket.name] = null;
}-*/;
protected Sockets() {
}
}
}