/*
 * Copyright (c) 2011-2018 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.
 */

/*
 * 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 org.reactivestreams.Publisher;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;

SourceProducer is a Publisher that is Scannable for the purpose of being tied back to a chain of operators. By itself it doesn't allow walking the hierarchy of operators, as they can only be tied from downstream to upstream by referencing their sources.
Author:Simon Baslé
Type parameters:
  • <O> – output operator produced type
/** * * {@link SourceProducer} is a {@link Publisher} that is {@link Scannable} for the * purpose of being tied back to a chain of operators. By itself it doesn't allow * walking the hierarchy of operators, as they can only be tied from downstream to upstream * by referencing their sources. * * @param <O> output operator produced type * * @author Simon Baslé */
interface SourceProducer<O> extends Scannable, Publisher<O> { @Override @Nullable default Object scanUnsafe(Attr key) { if (key == Attr.PARENT) return Scannable.from(null); if (key == Attr.ACTUAL) return Scannable.from(null); return null; } @Override default String stepName() { return "source(" + getClass().getSimpleName() + ")"; } }