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/*
* Copyright 2021 TiKV Project 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
*
* http://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.tikv.common;
import io.prometheus.client.exporter.HTTPServer;
import io.prometheus.client.hotspot.DefaultExports;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class MetricsServer {
private static final Logger logger = LoggerFactory.getLogger(MetricsServer.class);
private static MetricsServer METRICS_SERVER_INSTANCE = null;
private static int metricsServerRefCount = 0;
private final int port;
private final HTTPServer server;
public static MetricsServer getInstance(TiConfiguration conf) {
if (!conf.isMetricsEnable()) {
return null;
}
synchronized (MetricsServer.class) {
int port = conf.getMetricsPort();
if (METRICS_SERVER_INSTANCE != null) {
if (port != METRICS_SERVER_INSTANCE.port) {
throw new IllegalArgumentException(
String.format(
"Do dot support multiple tikv.metrics.port, which are %d and %d",
port, METRICS_SERVER_INSTANCE.port));
}
} else {
METRICS_SERVER_INSTANCE = new MetricsServer(port);
}
metricsServerRefCount += 1;
return METRICS_SERVER_INSTANCE;
}
}
private MetricsServer(int port) {
try {
this.port = port;
DefaultExports.initialize();
this.server = new HTTPServer(port, true);
logger.info("http server is up " + this.server.getPort());
} catch (Exception e) {
logger.error("http server not up");
throw new RuntimeException(e);
}
}
public void close() {
synchronized (MetricsServer.class) {
if (metricsServerRefCount == 1) {
if (server != null) {
server.stop();
logger.info("Metrics server on " + server.getPort() + " is stopped");
}
METRICS_SERVER_INSTANCE = null;
}
if (metricsServerRefCount >= 1) {
metricsServerRefCount -= 1;
}
}
}
}