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index.zulzul<zk>
<div apply="pkg$.AsyncEventController">
Initial Content
<div id="componentA"/>
<div id="componentB"/>
</div>
</zk>
AsyncEventController.javajavaimport org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Desktop;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Div;
import org.zkoss.zul.Label;
import java.util.concurrent.CompletableFuture;
import java.util.function.Consumer;
import java.util.function.Supplier;
public class AsyncEventController extends GenericForwardComposer {
//possibly injected by some IoC container
Backend backend = new Backend();
private Div componentA;
private Div componentB;
@Override
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
if (!desktop.isServerPushEnabled()) {
desktop.enableServerPush(true);
}
final CompletableFuture<Void> taskA =
CompletableFuture.supplyAsync(backend::initPrimaryLoad)
.thenAccept(activated(data -> componentA.appendChild(new Label(data))));
final CompletableFuture<Void> taskB =
CompletableFuture.supplyAsync(backend::initSecondaryLoad)
.thenAccept(activated(data -> componentB.appendChild(new Label(data))));
CompletableFuture.allOf(taskA, taskB)
.thenRun(() -> desktop.enableServerPush(false)) //optionally disable server push when done (unless further required)
.exceptionally(e -> {
System.out.println(e);
return null;
});
}
public <T> Consumer<T> activated(Consumer<T> task) {
Desktop desktop = Executions.getCurrent().getDesktop();
return (T param) -> {
try {
Executions.activate(desktop);
task.accept(param);
} catch (InterruptedException e) {
throw new RuntimeException("couldn't activate execution", e);
} finally {
Executions.deactivate(desktop);
}
};
}
// usually in a separate class
public static class Backend {
public String initPrimaryLoad() {
try {
Thread.sleep(2000); //simulate slow backend
} catch (InterruptedException e) {
e.printStackTrace();
}
return "primary load data";
}
public String initSecondaryLoad() {
try {
Thread.sleep(4000); //simulate slow backend
} catch (InterruptedException e) {
e.printStackTrace();
}
return "secondary load data";
}
}
}