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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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).
*
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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.
* <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>
* <code>
* class HelloWorld extend Event {
*
* {@literal @}Label("Message");
* String message;
*
* {@literal @}SettingDefinition;
* {@literal @}Label("Message Filter");
* public boolean filter(RegExpControl regExp) {
* return regExp.matches(message);
* }
* }
* </code>
* </pre>
*
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