/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.util;
/**
* Holds {@link Attribute}s which can be accessed via {@link AttributeKey}.
*
* Implementations must be Thread-safe.
*/
public interface AttributeMap {
/**
* Get the {@link Attribute} for the given {@link AttributeKey}. This method will never return null, but may return
* an {@link Attribute} which does not have a value set yet.
*/
<T> Attribute<T> attr(AttributeKey<T> key);
}