/*
* 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
*
* 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.
*/
/*
* 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 org.reactivestreams.
Publisher;
import reactor.core.
Scannable;
import reactor.util.annotation.
Nullable;
/**
*
* {@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() + ")";
}
}