I'm trying to emulate CompletableFuture by backing directly onto Promise,
but when compiling it gives this error:
"No source code is available for type
java.util.concurrent.CompletableFuture<T>"
(it finds other JRE classes I've replaced fine)
My source I'm including is below. Am I doing anything illegal?
********************************************
package java.util.concurrent;
import com.google.gwt.user.client.*;
import jsinterop.annotations.*;
import java.util.function.*;
@JsType(isNative=true, name = "Promise", namespace = JsPackage.GLOBAL)
public class CompletableFuture<T> implements CompletionStage<T> {
@JsMethod(name = "then")
public native <U> CompletableFuture<U> thenApply(Function<? super T,?
extends U> fn);
@JsMethod(name = "then")
public native CompletableFuture<Void> thenAccept(Consumer<? super T>
action);
@JsMethod(name = "then")
public native <U> CompletableFuture<U> thenCompose(Function<? super T,
? extends CompletionStage<U>> fn);
@JsMethod(name = "reject")
public native boolean completeExceptionally(Throwable ex);
@JsMethod(name = "resolve")
public native boolean complete(T value);
@JsMethod(name = "resolve")
public static native <U> CompletableFuture<U> completedFuture(U value);
@JsOverlay
public T get() throws InterruptedException, ExecutionException {
Window.alert("Calling synchronous get() on CompletableFuture is not
possible in Javascript!");
throw new IllegalStateException("Unimplemented!");
}
}
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