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/*
 * Copyright (c) 2020-2030, Shuigedeng ([email protected] & https://blog.taotaocloud.top/).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.taotao.boot.rxjava.async;

import io.reactivex.rxjava3.core.Single;
import org.springframework.util.Assert;
import org.springframework.web.context.request.async.DeferredResult;

/**
 * A specialized {@link DeferredResult} that handles {@link Single} return type.
 *
 * @author shuigedeng
 * @version 2021.9
 * @since 2021-09-07 20:49:27
 */
public class SingleDeferredResult extends DeferredResult {

	private static final Object EMPTY_RESULT = new Object();

	private final DeferredResultObserver observer;

	public SingleDeferredResult(Single single) {
		this(null, EMPTY_RESULT, single);
	}

	public SingleDeferredResult(long timeout, Single single) {
		this(timeout, EMPTY_RESULT, single);
	}

	public SingleDeferredResult(Long timeout, Object timeoutResult, Single single) {
		super(timeout, timeoutResult);
		Assert.notNull(single, "single can not be null");

		observer = new DeferredResultObserver(single.toObservable(), this);
	}
}