001/**
002 * Copyright (C) 2006-2020 Talend Inc. - www.talend.com
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.talend.sdk.component.api.service;
017
018import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
019import static java.lang.annotation.RetentionPolicy.RUNTIME;
020
021import java.lang.annotation.Retention;
022import java.lang.annotation.Target;
023
024@Target(ANNOTATION_TYPE)
025@Retention(RUNTIME)
026public @interface ActionType {
027
028    /**
029     * @return the value of the action, MUST be unique across the whole application.
030     */
031    String value();
032
033    /**
034     * @return a constraint for the returned type of the action if it needs to respect a contract.
035     */
036    Class<?> expectedReturnedType() default Object.class;
037}