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index.zulzul<window title="test of long operation" border="normal">
<html><![CDATA[
<ul>
<li>Click the button it will start a long operation.</li>
<li>With this implementation, you can press the button again even if
the long operation is still being processed</li>
</ul>
]]></html>
<zscript>
void print(String msg) {
new Label(msg).setParent(inf);
}
</zscript>
<button label="async long op">
<attribute name="onClick"><![CDATA[
if (EventQueues.exists("longop")) {
print("It is busy. Please wait");
return; //busy
}
EventQueue eq = EventQueues.lookup("longop"); //create a queue
String result;
//subscribe async listener to handle long operation
eq.subscribe(new EventListener() {
public void onEvent(Event evt) {
if ("doLongOp".equals(evt.getName())) {
org.zkoss.lang.Threads.sleep(3000); //simulate a long operation
result = "success"; //store the result
eq.publish(new Event("endLongOp")); //notify it is done
}
}
}, true); //asynchronous
//subscribe a normal listener to show the resul to the browser
eq.subscribe(new EventListener() {
public void onEvent(Event evt) {
if ("endLongOp".equals(evt.getName())) {
print(result); //show the result to the browser
EventQueues.remove("longop");
}
}
}); //synchronous
print("Wait for 3 seconds");
eq.publish(new Event("doLongOp")); //kick off the long operation
]]></attribute>
</button>
<vbox id="inf"/>
</window>