spring OnlyOnceLoggingDenyMeterFilter 源码
springboot OnlyOnceLoggingDenyMeterFilter 代码
文件路径：/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/OnlyOnceLoggingDenyMeterFilter.java
/*
* Copyright 2012-2020 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.boot.actuate.autoconfigure.metrics;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import io.micrometer.core.instrument.Meter.Id;
import io.micrometer.core.instrument.config.MeterFilter;
import io.micrometer.core.instrument.config.MeterFilterReply;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.Assert;
/**
* {@link MeterFilter} to log only once a warning message and deny a {@link Id Meter.Id}.
*
* @author Jon Schneider
* @author Dmytro Nosan
* @since 2.0.5
*/
public final class OnlyOnceLoggingDenyMeterFilter implements MeterFilter {
private static final Log logger = LogFactory.getLog(OnlyOnceLoggingDenyMeterFilter.class);
private final AtomicBoolean alreadyWarned = new AtomicBoolean();
private final Supplier<String> message;
public OnlyOnceLoggingDenyMeterFilter(Supplier<String> message) {
Assert.notNull(message, "Message must not be null");
this.message = message;
}
@Override
public MeterFilterReply accept(Id id) {
if (logger.isWarnEnabled() && this.alreadyWarned.compareAndSet(false, true)) {
logger.warn(this.message.get());
}
return MeterFilterReply.DENY;
}
}
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