001    /*
002     * Copyright (C) 2007 The Guava Authors
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     */
016    
017    package com.google.common.eventbus;
018    
019    import com.google.common.annotations.Beta;
020    import java.lang.annotation.ElementType;
021    import java.lang.annotation.Retention;
022    import java.lang.annotation.RetentionPolicy;
023    import java.lang.annotation.Target;
024    
025    /**
026     * Marks an event handling method as being thread-safe.  This annotation
027     * indicates that EventBus may invoke the event handler simultaneously from
028     * multiple threads.
029     *
030     * <p>This does not mark the method as an event handler, and so should be used
031     * in combination with {@link Subscribe}.
032     *
033     * @author Cliff Biffle
034     * @since 10.0
035     */
036    @Retention(RetentionPolicy.RUNTIME)
037    @Target(ElementType.METHOD)
038    @Beta
039    public @interface AllowConcurrentEvents {
040    }