/*
 * 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
 *
 *       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.util.concurrent.Callable;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.publisher.FluxOnAssembly.AssemblySnapshot;

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
Type parameters:
  • <T> – the value type passing through
See Also:
/** * Captures the current stacktrace when this publisher is created and makes it * available/visible for debugging purposes from the inner Subscriber. * <p> * Note that getting a stacktrace is a costly operation. * <p> * The operator sanitizes the stacktrace and removes noisy entries such as: <ul> * <li>java.lang.Thread entries</li> <li>method references with source line of 1 (bridge * methods)</li> <li>Tomcat worker thread entries</li> <li>JUnit setup</li> </ul> * * @param <T> the value type passing through * @see <a href="https://github.com/reactor/reactive-streams-commons">https://github.com/reactor/reactive-streams-commons</a> */
final class FluxCallableOnAssembly<T> extends InternalFluxOperator<T, T> implements Fuseable, Callable<T>, AssemblyOp { final AssemblySnapshot stacktrace; FluxCallableOnAssembly(Flux<? extends T> source, AssemblySnapshot stacktrace) { super(source); this.stacktrace = stacktrace; } @Override public CoreSubscriber<? super T> subscribeOrReturn(CoreSubscriber<? super T> actual) { return FluxOnAssembly.wrapSubscriber(actual, source, stacktrace); } @SuppressWarnings("unchecked") @Override public T call() throws Exception { return ((Callable<T>) source).call(); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.ACTUAL_METADATA) return !stacktrace.checkpointed; 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(); } }