001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.actuate.autoconfigure.metrics; 018 019import java.util.concurrent.atomic.AtomicBoolean; 020import java.util.function.Supplier; 021 022import io.micrometer.core.instrument.Meter.Id; 023import io.micrometer.core.instrument.config.MeterFilter; 024import io.micrometer.core.instrument.config.MeterFilterReply; 025import org.apache.commons.logging.Log; 026import org.apache.commons.logging.LogFactory; 027 028import org.springframework.util.Assert; 029 030/** 031 * {@link MeterFilter} to log only once a warning message and deny a {@link Id Meter.Id}. 032 * 033 * @author Jon Schneider 034 * @author Dmytro Nosan 035 * @since 2.0.5 036 */ 037public final class OnlyOnceLoggingDenyMeterFilter implements MeterFilter { 038 039 private static final Log logger = LogFactory 040 .getLog(OnlyOnceLoggingDenyMeterFilter.class); 041 042 private final AtomicBoolean alreadyWarned = new AtomicBoolean(false); 043 044 private final Supplier<String> message; 045 046 public OnlyOnceLoggingDenyMeterFilter(Supplier<String> message) { 047 Assert.notNull(message, "Message must not be null"); 048 this.message = message; 049 } 050 051 @Override 052 public MeterFilterReply accept(Id id) { 053 if (logger.isWarnEnabled() && this.alreadyWarned.compareAndSet(false, true)) { 054 logger.warn(this.message.get()); 055 } 056 return MeterFilterReply.DENY; 057 } 058 059}