001// Copyright 2010 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.
014package org.apache.tapestry5.ioc;
015
016import java.util.Set;
017
018import org.apache.tapestry5.ioc.def.ServiceDef;
019
020
021/**
022 * Interface implemented by objects which need to disambiguate services with marker annotations.
023 *
024 * @since 5.2.2
025 */
026public interface Markable
027{
028    /**
029     * Returns an optional set of <em>marker annotation</em>. Marker annotations are used to disambiguate services; the
030     * combination of a marker annotation and a service type is expected to be unique. Note that it is not possible
031     * to identify which annotations are markers and which are not when this set is constructed, so it may include
032     * non-marker annotations.
033     *
034     * @see ServiceDef#getMarkers()
035     */
036    Set<Class> getMarkers();
037
038    /**
039     * Returns the service interface associated with the service.
040     *
041     * @see ServiceDef#getServiceInterface()
042     */
043    Class getServiceInterface();
044}