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// 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 com.yahoo.jdisc.Response;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;

/**
 * This class provides an implementation of {@link ResponseHandler} that allows you to wait for a {@link Response} to
 * be returned.
 *
 * @author Simon Thoresen Hult
 */
public final class FutureResponse extends CompletableFuture implements ResponseHandler {

    private final ResponseHandler handler;

    /**
     * 

Constructs a new FutureResponse that returns a {@link NullContent} when {@link #handleResponse(Response)} is * invoked.

*/ public FutureResponse() { this(NullContent.INSTANCE); } /** *

Constructs a new FutureResponse that returns the given {@link ContentChannel} when {@link * #handleResponse(Response)} is invoked.

* * @param content The content channel for the Response. */ public FutureResponse(ContentChannel content) { this(response -> content); } /** *

Constructs a new FutureResponse that calls the given {@link ResponseHandler} when {@link * #handleResponse(Response)} is invoked.

* * @param handler The ResponseHandler to invoke. */ public FutureResponse(ResponseHandler handler) { this.handler = handler; } public void addListener(Runnable r, Executor e) { whenCompleteAsync((__, ___) -> r.run(), e); } @Override public ContentChannel handleResponse(Response response) { complete(response); return handler.handleResponse(response); } @Override public final boolean cancel(boolean mayInterruptIfRunning) { throw new UnsupportedOperationException(); } @Override public final boolean isCancelled() { return false; } }




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