/*
* 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.
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;
/**
* 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
FluxOperator<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 void
subscribe(
CoreSubscriber<? super T>
actual) {
source.
subscribe(
actual);
}
@
Nullable
@
Override
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
NAME) {
return
name;
}
if (
key ==
Attr.
TAGS &&
tags != null) {
return
tags.
stream();
}
return super.scanUnsafe(
key);
}
}