/*
 * Copyright (c) 2011-2017 Pivotal Software Inc, All Rights Reserved.
 *
 * 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 reactor.guide;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.junit.Test;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Hooks;

import static org.assertj.core.api.Assertions.assertThat;

//this test is here to have a runnable demonstration of a more advanced traceback in
// debugging mode. it was put outside of reactor.core package so that the traceback shows
// more details
public class GuideDebuggingExtraTests {

	@Test
	public void debuggingActivatedWithDeepTraceback() {
		Hooks.onOperator(h -> h.operatorStacktrace());

		try {
			StringWriter sw = new StringWriter();
			FakeRepository.findAllUserByName(Flux.just("pedro", "simon", "stephane"))
			              .transform(FakeUtils1.applyFilters)
			              .transform(FakeUtils2.enrichUser)
			              .subscribe(System.out::println,
					              t -> t.printStackTrace(new PrintWriter(sw))
			              );

			String debugStack = sw.toString();

			assertThat(debugStack)
					.endsWith("Error has been observed by the following operator(s):\n"
							+ "\t|_\tFlux.map(FakeRepository.java:27)\n"
							+ "\t|_\tFlux.map(FakeRepository.java:28)\n"
							+ "\t|_\tFlux.filter(FakeUtils1.java:29)\n"
							+ "\t|_\tFlux.transform(GuideDebuggingExtraTests.java:40)\n"
							+ "\t|_\tFlux.elapsed(FakeUtils2.java:30)\n"
							+ "\t|_\tFlux.transform(GuideDebuggingExtraTests.java:41)\n\n");
		}
		finally {
			Hooks.resetOnOperator();
		}
	}
}