com.yahoo.jdisc.handler.FutureCompletion Maven / Gradle / Ivy
// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.handler;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
/**
* This class provides an implementation of {@link CompletionHandler} that allows you to wait for either {@link
* #completed()} or {@link #failed(Throwable)} to be called. If failed() was called, the corresponding Throwable will
* be rethrown when calling either of the get() methods. Unless an exception is thrown, the get() methods will always
* return Boolean.TRUE.
*
* Notice that calling {@link #cancel(boolean)} throws an UnsupportedOperationException.
*
* @author Simon Thoresen Hult
*/
public final class FutureCompletion extends CompletableFuture implements CompletionHandler {
@Override
public void completed() {
complete(true);
}
@Override
public void failed(Throwable t) {
completeExceptionally(t);
}
@Override
public final boolean cancel(boolean mayInterruptIfRunning) {
throw new UnsupportedOperationException();
}
@Override
public final boolean isCancelled() {
return false;
}
public void addListener(Runnable r, Executor e) { whenCompleteAsync((__, ___) -> r.run(), e); }
}