spring FlightRecorderApplicationStartup 源码
spring FlightRecorderApplicationStartup 代码
文件路径：/spring-core/src/main/java/org/springframework/core/metrics/jfr/FlightRecorderApplicationStartup.java
/*
* Copyright 2002-2021 the original author or authors.
*
* Licensed 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 org.springframework.core.metrics.jfr;
import java.util.Deque;
import java.util.concurrent.ConcurrentLinkedDeque;
import java.util.concurrent.atomic.AtomicLong;
import org.springframework.core.metrics.ApplicationStartup;
import org.springframework.core.metrics.StartupStep;
/**
* {@link ApplicationStartup} implementation for the Java Flight Recorder.
* <p>This variant records {@link StartupStep} as Flight Recorder events. Because
* such events only support base types, the
* {@link org.springframework.core.metrics.StartupStep.Tags} are serialized as a
* single String attribute.
* <p>Once this is configured on the application context, you can record data by
* launching the application with recording enabled:
* {@code java -XX:StartFlightRecording:filename=recording.jfr,duration=10s -jar app.jar}.
*
* @author Brian Clozel
* @since 5.3
*/
public class FlightRecorderApplicationStartup implements ApplicationStartup {
private final AtomicLong currentSequenceId = new AtomicLong(0);
private final Deque<Long> currentSteps;
public FlightRecorderApplicationStartup() {
this.currentSteps = new ConcurrentLinkedDeque<>();
this.currentSteps.offerFirst(this.currentSequenceId.get());
}
@Override
public StartupStep start(String name) {
long sequenceId = this.currentSequenceId.incrementAndGet();
this.currentSteps.offerFirst(sequenceId);
return new FlightRecorderStartupStep(sequenceId, name,
this.currentSteps.getFirst(), committedStep -> this.currentSteps.removeFirstOccurrence(sequenceId));
}
}
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