org.cometd.annotation.Param Maven / Gradle / Ivy
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/*
* Copyright (c) 2008-2020 the original author or authors.
*
* 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 org.cometd.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* For methods annotated with {@link Listener} or {@link Subscription}
* whose value is a channel template such as {@code /game/{gameId}}, this
* annotation binds parameters of those methods with the value obtained
* matching the actual channel with the channel template.
* For example:
*
* @Service
* public class GameService
* {
* @Listener("/game/{gameId}")
* public void handleGame(ServerSession remote, ServerMessage.Mutable message, @Param("gameId") String gameId)
* {
* // Use the 'gameId' parameter here.
* }
* }
*
* The variable name defined in the {@link Listener} or {@link Subscription}
* annotation must be the same defined by the {@link Param} annotation.
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Param {
/**
* @return the variable name that identifies the parameter annotated with this annotation
*/
public String value();
}