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

/**
 * Captures the current stacktrace when this connectable 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 ParallelFluxOnAssembly extends ParallelFlux implements Fuseable, AssemblyOp, Scannable { final ParallelFlux source; final AssemblySnapshot stacktrace; /** * Create an assembly trace wrapping a {@link ParallelFlux}. */ ParallelFluxOnAssembly(ParallelFlux source, AssemblySnapshot stacktrace) { this.source = source; this.stacktrace = stacktrace; } @Override public int getPrefetch() { return source.getPrefetch(); } @Override public int parallelism() { return source.parallelism(); } @Override @SuppressWarnings("unchecked") public void subscribe(CoreSubscriber[] subscribers) { if (!validate(subscribers)) { return; } int n = subscribers.length; @SuppressWarnings("unchecked") CoreSubscriber[] parents = new CoreSubscriber[n]; CoreSubscriber s; for (int i = 0; i < n; i++) { s = subscribers[i]; if (s instanceof ConditionalSubscriber) { ConditionalSubscriber cs = (ConditionalSubscriber) s; s = new FluxOnAssembly.OnAssemblyConditionalSubscriber<>(cs, stacktrace, source, this); } else { s = new FluxOnAssembly.OnAssemblySubscriber<>(s, stacktrace, source, this); } parents[i] = s; } source.subscribe(parents); } @Override @Nullable public Object scanUnsafe(Attr key) { if (key == Attr.PARENT) return source; if (key == Attr.PREFETCH) return getPrefetch(); if (key == Attr.ACTUAL_METADATA) return !stacktrace.isCheckpoint; if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return null; } @Override public String stepName() { return stacktrace.operatorAssemblyInformation(); } @Override public String toString() { return stacktrace.operatorAssemblyInformation(); } }




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