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/*
 * 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.core.publisher;

import java.util.function.Consumer;

import reactor.core.CoreSubscriber;
import reactor.core.Disposable;
import reactor.core.Fuseable;
import reactor.core.Scannable;
import reactor.core.publisher.FluxOnAssembly.AssemblySnapshotException;
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 ConnectableFluxOnAssembly extends ConnectableFlux implements
                                                                    Fuseable, AssemblyOp,
                                                                    Scannable {

	final ConnectableFlux source;

	final AssemblySnapshotException stacktrace;

	ConnectableFluxOnAssembly(ConnectableFlux source) {
		this.source = source;
		this.stacktrace = new AssemblySnapshotException();
	}
	
	@Override
	public void subscribe(CoreSubscriber actual) {
		FluxOnAssembly.subscribe(actual, source, stacktrace);
	}

	@Override
	public void connect(Consumer cancelSupport) {
		source.connect(cancelSupport);
	}

	@Override
	@Nullable
	public Object scanUnsafe(Attr key) {
		if (key == Attr.PREFETCH) return getPrefetch();
		if (key == Attr.PARENT) return source;

		return null;
	}

	@Override
	public String toString() {
		return stacktrace.stackFirst();
	}
}