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/*
 * Copyright (c) 2016-2021 VMware Inc. or its affiliates, 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
 *
 *   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 reactor.core.publisher;

import java.time.Duration;
import java.util.concurrent.Callable;

import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Fuseable;
import reactor.core.publisher.FluxOnAssembly.AssemblySnapshot;
import reactor.util.annotation.Nullable;

/**
 * Captures the current stacktrace when this publisher is created and makes it
 * available/visible for debugging purposes from the inner Subscriber.
 * 

* Note that getting a stacktrace is a costly operation. *

* The operator sanitizes the stacktrace and removes noisy entries such as:

    *
  • java.lang.Thread entries
  • method references with source line of 1 (bridge * methods)
  • Tomcat worker thread entries
  • JUnit setup
* * @param the value type passing through * * @see https://github.com/reactor/reactive-streams-commons */ final class MonoCallableOnAssembly extends InternalMonoOperator implements Callable, AssemblyOp { final AssemblySnapshot stacktrace; MonoCallableOnAssembly(Mono source, AssemblySnapshot stacktrace) { super(source); this.stacktrace = stacktrace; } @Override @Nullable public T block() { //duration is ignored below return block(Duration.ZERO); } @Override @Nullable @SuppressWarnings("unchecked") public T block(Duration timeout) { try { return ((Callable) source).call(); } catch (Throwable e) { throw Exceptions.propagate(e); } } @Override @SuppressWarnings("unchecked") public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) { if (actual instanceof Fuseable.ConditionalSubscriber) { Fuseable.ConditionalSubscriber cs = (Fuseable.ConditionalSubscriber) actual; return new FluxOnAssembly.OnAssemblyConditionalSubscriber<>(cs, stacktrace, source, this); } else { return new FluxOnAssembly.OnAssemblySubscriber<>(actual, stacktrace, source, this); } } @SuppressWarnings("unchecked") @Override @Nullable public T call() throws Exception { return ((Callable) source).call(); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.ACTUAL_METADATA) return !stacktrace.isCheckpoint; if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return super.scanUnsafe(key); } @Override public String stepName() { return stacktrace.operatorAssemblyInformation(); } @Override public String toString() { return stacktrace.operatorAssemblyInformation(); } }




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