1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27 package org.apache.http.annotation;
28
29 import java.lang.annotation.Documented;
30 import java.lang.annotation.ElementType;
31 import java.lang.annotation.Retention;
32 import java.lang.annotation.RetentionPolicy;
33 import java.lang.annotation.Target;
34
35 /**
36 * The class to which this annotation is applied is thread-safe. This means that
37 * no sequences of accesses (reads and writes to public fields, calls to public methods)
38 * may put the object into an invalid state, regardless of the interleaving of those actions
39 * by the runtime, and without requiring any additional synchronization or coordination on the
40 * part of the caller.
41 * @see NotThreadSafe
42 * <p>
43 * Based on code developed by Brian Goetz and Tim Peierls and concepts
44 * published in 'Java Concurrency in Practice' by Brian Goetz, Tim Peierls,
45 * Joshua Bloch, Joseph Bowbeer, David Holmes and Doug Lea.
46 */
47 @Documented
48 @Target(ElementType.TYPE)
49 @Retention(RetentionPolicy.CLASS) // The original version used RUNTIME
50 public @interface ThreadSafe {
51 }