reactor.bus.selector.HeaderResolver Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2014 Pivotal Software, Inc.
*
* 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.bus.selector;
import javax.annotation.Nullable;
import java.util.Map;
/**
* Responsible for extracting any applicable headers from a key.
*
* @author Jon Brisbin
* @author Stephane Maldini
*/
public interface HeaderResolver {
/**
* Resolve the headers that might be encoded in a key.
*
* @param key The key to match.
*
* @return Any applicable headers. Might be {@literal null}.
*/
@Nullable
Map resolve(Object key);
}