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/**
 * Copyright (c) 2015-2016 the original author or authors
 *
 * 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
 *
 * http://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 io.jmnarloch.spring.boot.rxjava.async;

import io.reactivex.Observable;
import io.reactivex.observers.DisposableObserver;
import org.springframework.web.context.request.async.DeferredResult;

/**
 * A subscriber that sets the single value produced by the {@link Observable} on the {@link DeferredResult}.
 *
 * @author Jakub Narloch
 * @author Robert Danci
 * @see DeferredResult
 */
class DeferredResultObserver extends DisposableObserver implements Runnable {

    private final DeferredResult deferredResult;

    public DeferredResultObserver(Observable observable, DeferredResult deferredResult) {
        this.deferredResult = deferredResult;
        this.deferredResult.onTimeout(this);
        this.deferredResult.onCompletion(this);
        observable.subscribe(this);
    }

    @Override
    public void onNext(T value) {
        deferredResult.setResult(value);
    }

    @Override
    public void onError(Throwable e) {
        deferredResult.setErrorResult(e);
    }

    @Override
    public void onComplete() {
    }

    @Override
    public void run() {
        this.dispose();
    }
}