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   /*
    * Copyright 2016 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.util.internal;
  
  import java.lang.annotation.Documented;
  import java.lang.annotation.ElementType;
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.lang.annotation.Target;
  
  /**
   * Indicates a public API that can change at any time (even in minor/bugfix releases).
   *
   * Usage guidelines:
   *
   * <ol>
   *     <li>Is not needed for things located in *.internal.* packages</li>
   *     <li>Only public accessible classes/interfaces must be annotated</li>
   *     <li>If this annotation is not present the API is considered stable and so no backward compatibility can be
   *         broken in a non-major release!</li>
   * </ol>
   */
  @Retention(RetentionPolicy.SOURCE) // TODO Retention policy needs to be CLASS in Netty 5.
  @Target({
          ElementType.ANNOTATION_TYPE,
          ElementType.CONSTRUCTOR,
          ElementType.FIELD,
          ElementType.METHOD,
          ElementType.PACKAGE,
          ElementType.TYPE
  })
  @Documented
  public @interface UnstableApi {
  }