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copied!<p>Couldn't you have all your methods return a <code>ListenableFuture</code> wrapper like:</p> <pre><code>import com.google.common.util.concurrent.ForwardingListenableFuture; import com.google.common.util.concurrent.ListenableFuture; import javax.annotation.Nonnull; import java.util.concurrent.Executor; import static com.google.common.base.Preconditions.checkArgument; import static com.google.common.base.Preconditions.checkNotNull; public class ListenableFutureWithFixedExecutor<V> extends ForwardingListenableFuture<V> { @Nonnull private final ListenableFuture<V> delegate; @Nonnull private final Executor executor; public ListenableFutureWithFixedExecutor(@Nonnull ListenableFuture<V> delegate, @Nonnull Executor executor) { this.delegate = checkNotNull(delegate); this.executor = checkNotNull(executor); } @Override protected ListenableFuture<V> delegate() { return delegate; } @Override public void addListener(Runnable listener, Executor executor) { checkArgument(this.executor.equals(executor), "Listeners can only be executed using %s", executor); super.addListener(listener, executor); //To change body of overridden methods use File | Settings | File Templates. } } </code></pre> <p>Another possibility: instead of throwing an <code>IllegalArgumentException</code> when the client calls <code>addListener()</code> with an incorrect callback, you could simply log a warning, and call <code>super.addListener()</code> with the correct executor.</p> <p>You could even add a method <code><V> void addCallback(FutureCallback<? super V> callback)</code> that adds the given callback to the Future, using the fixed executor. This would let you use your Future more fluently :)</p>

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