/*
 * 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.Collections;
import java.util.HashSet;
import java.util.Objects;
import java.util.Set;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
import reactor.util.function.Tuple2;
import reactor.util.function.Tuples;

import static reactor.core.Scannable.Attr.RUN_STYLE;
import static reactor.core.Scannable.Attr.RunStyle.SYNC;

An operator that just bears a name or a set of tags, which can be retrieved via the TAGS attribute.
Author:Simon Baslé, Stephane Maldini
/** * An operator that just bears a name or a set of tags, which can be retrieved via the * {@link reactor.core.Scannable.Attr#TAGS TAGS} * attribute. * * @author Simon Baslé * @author Stephane Maldini */
final class FluxName<T> extends InternalFluxOperator<T, T> { final String name; final Set<Tuple2<String, String>> tags; @SuppressWarnings("unchecked") static <T> Flux<T> createOrAppend(Flux<T> source, String name) { Objects.requireNonNull(name, "name"); if (source instanceof FluxName) { FluxName<T> s = (FluxName<T>) source; return new FluxName<>(s.source, name, s.tags); } if (source instanceof FluxNameFuseable) { FluxNameFuseable<T> s = (FluxNameFuseable<T>) source; return new FluxNameFuseable<>(s.source, name, s.tags); } if (source instanceof Fuseable) { return new FluxNameFuseable<>(source, name, null); } return new FluxName<>(source, name, null); } @SuppressWarnings("unchecked") static <T> Flux<T> createOrAppend(Flux<T> source, String tagName, String tagValue) { Objects.requireNonNull(tagName, "tagName"); Objects.requireNonNull(tagValue, "tagValue"); Set<Tuple2<String, String>> tags = Collections.singleton(Tuples.of(tagName, tagValue)); if (source instanceof FluxName) { FluxName<T> s = (FluxName<T>) source; if(s.tags != null) { tags = new HashSet<>(tags); tags.addAll(s.tags); } return new FluxName<>(s.source, s.name, tags); } if (source instanceof FluxNameFuseable) { FluxNameFuseable<T> s = (FluxNameFuseable<T>) source; if (s.tags != null) { tags = new HashSet<>(tags); tags.addAll(s.tags); } return new FluxNameFuseable<>(s.source, s.name, tags); } if (source instanceof Fuseable) { return new FluxNameFuseable<>(source, null, tags); } return new FluxName<>(source, null, tags); } FluxName(Flux<? extends T> source, @Nullable String name, @Nullable Set<Tuple2<String, String>> tags) { super(source); this.name = name; this.tags = tags; } @Override public CoreSubscriber<? super T> subscribeOrReturn(CoreSubscriber<? super T> actual) { return actual; } @Nullable @Override public Object scanUnsafe(Attr key) { if (key == Attr.NAME) { return name; } if (key == Attr.TAGS && tags != null) { return tags.stream(); } if (key == RUN_STYLE) { return SYNC; } return super.scanUnsafe(key); } }