    001// Copyright 2007 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.services;
    016
    017import java.lang.annotation.Documented;
    018import java.lang.annotation.Retention;
    019import java.lang.annotation.Target;
    020
    021import static java.lang.annotation.ElementType.FIELD;
    022import static java.lang.annotation.ElementType.PARAMETER;
    023import static java.lang.annotation.RetentionPolicy.RUNTIME;
    024
    025/**
    026 * Marker annotation used to identify a service from the component layer that conflicts, in terms of service interface,
    027 * with a service from elsewhere. In particular, this is used to disambiguate {@link org.apache.tapestry5.ioc.services.PlasticProxyFactory} which has one implementation (marked with {@link
    028 * org.apache.tapestry5.ioc.services.Builtin} and another with this annotation.
    029 */
    030@Target(
    031        {PARAMETER, FIELD})
    032@Retention(RUNTIME)
    033@Documented
    034public @interface ComponentLayer
    035{
    036
    037}