/*
 * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package jdk.jfr;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

Annotation that specifies that a method in an event class should be used to
filter out events.
 For the method to be valid it must return a SettingControl and only have one parameter, which should be a non-abstract subclass of SettingControl 

The return value of the method specifies whether the event is to be
written to the Flight Recorder system or not.

The following example shows how to annotate a method in an event class.
class HelloWorld extends Event {
  @Label("Message")
  String message;
  @SettingDefinition
  @Label("Message Filter")
  public boolean filter(RegExpControl regExp) {
    return regExp.matches(message);
  }
 }
 For an example of how the setting controls are defined, see SettingControl. 
See Also:
SettingControl
Since:
9/**
 * Annotation that specifies that a method in an event class should be used to
 * filter out events.
 * <p>
 * For the method to be valid it must return a {@code SettingControl} and only have one
 * parameter, which should be a non-abstract subclass of {@link SettingControl}
 * <p>
 * The return value of the method specifies whether the event is to be
 * written to the Flight Recorder system or not.
 * <p>
 * The following example shows how to annotate a method in an event class.
 *
 * <pre>{@literal
 * class HelloWorld extends Event {
 *
 *   @Label("Message")
 *   String message;
 *
 *   @SettingDefinition
 *   @Label("Message Filter")
 *   public boolean filter(RegExpControl regExp) {
 *     return regExp.matches(message);
 *   }
 * }
 * }</pre>
 *
 * For an example of how the setting controls are defined, see
 * {@link SettingControl}.
 *
 * @see SettingControl
 *
 * @since 9
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD })
public @interface SettingDefinition {
}