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MicrometerEventLoopMeterRegistrar.java
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MicrometerEventLoopMeterRegistrar.java
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/*
* Copyright (c) 2021-2022 VMware, Inc. or its affiliates, All Rights Reserved.
*
* 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 reactor.netty5.transport;
import io.micrometer.core.instrument.Gauge;
import io.netty5.channel.EventLoop;
import io.netty5.util.concurrent.SingleThreadEventExecutor;
import reactor.netty5.internal.util.MapUtils;
import reactor.util.Logger;
import reactor.util.Loggers;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static reactor.netty5.transport.EventLoopMeters.EventLoopMetersTags.NAME;
import static reactor.netty5.transport.EventLoopMeters.PENDING_TASKS;
import static reactor.netty5.Metrics.REGISTRY;
/**
* Registers gauges for a given {@link EventLoop}.
*
* Every gauge uses thread name as tag.
*
* @author Pierre De Rop
* @author Violeta Georgieva
* @since 1.0.14
*/
final class MicrometerEventLoopMeterRegistrar {
final static MicrometerEventLoopMeterRegistrar INSTANCE = new MicrometerEventLoopMeterRegistrar();
static final Logger log = Loggers.getLogger(MicrometerEventLoopMeterRegistrar.class);
private final ConcurrentMap<String, EventLoop> cache = new ConcurrentHashMap<>();
private MicrometerEventLoopMeterRegistrar() {}
void registerMetrics(EventLoop eventLoop) {
if (eventLoop instanceof SingleThreadEventExecutor singleThreadEventExecutor) {
try {
String executorName = singleThreadEventExecutor.threadProperties().name();
MapUtils.computeIfAbsent(cache, executorName, key -> {
Gauge.builder(PENDING_TASKS.getName(), singleThreadEventExecutor::pendingTasks)
.tag(NAME.asString(), executorName)
.register(REGISTRY);
return eventLoop;
});
}
catch (InterruptedException e) {
if (log.isWarnEnabled()) {
log.warn("Thread interrupted while registering metrics", e);
}
}
}
}
}