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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.handler;
import com.google.common.util.concurrent.AbstractFuture;
import com.yahoo.jdisc.Response;
/**
* <p>This class provides an implementation of {@link ResponseHandler} that allows you to wait for a {@link Response} to
* be returned.</p>
*
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
*/
public final class FutureResponse extends AbstractFuture<Response> implements ResponseHandler {
private final ResponseHandler handler;
/**
* <p>Constructs a new FutureResponse that returns a {@link NullContent} when {@link #handleResponse(Response)} is
* invoked.</p>
*/
public FutureResponse() {
this(NullContent.INSTANCE);
}
/**
* <p>Constructs a new FutureResponse that returns the given {@link ContentChannel} when {@link
* #handleResponse(Response)} is invoked.</p>
*
* @param content The content channel for the Response.
*/
public FutureResponse(final ContentChannel content) {
this(new ResponseHandler() {
@Override
public ContentChannel handleResponse(Response response) {
return content;
}
});
}
/**
* <p>Constructs a new FutureResponse that calls the given {@link ResponseHandler} when {@link
* #handleResponse(Response)} is invoked.</p>
*
* @param handler The ResponseHandler to invoke.
*/
public FutureResponse(ResponseHandler handler) {
this.handler = handler;
}
@Override
public ContentChannel handleResponse(Response response) {
set(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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