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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.dubbo.monitor.support;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.NamedThreadFactory;
import org.apache.dubbo.monitor.Monitor;
import org.apache.dubbo.monitor.MonitorFactory;
import org.apache.dubbo.monitor.MonitorService;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import static org.apache.dubbo.common.constants.CommonConstants.INTERFACE_KEY;
/**
* AbstractMonitorFactory. (SPI, Singleton, ThreadSafe)
*/
public abstract class AbstractMonitorFactory implements MonitorFactory {
private static final Logger logger = LoggerFactory.getLogger(AbstractMonitorFactory.class);
/**
* The lock for getting monitor center
*/
private static final ReentrantLock LOCK = new ReentrantLock();
/**
* The monitor centers Map
*/
private static final Map MONITORS = new ConcurrentHashMap();
private static final Map> FUTURES = new ConcurrentHashMap>();
/**
* The monitor create executor
*/
private static final ExecutorService EXECUTOR = new ThreadPoolExecutor(0, 10, 60L, TimeUnit.SECONDS, new SynchronousQueue(), new NamedThreadFactory("DubboMonitorCreator", true));
public static Collection getMonitors() {
return Collections.unmodifiableCollection(MONITORS.values());
}
@Override
public Monitor getMonitor(URL url) {
url = url.setPath(MonitorService.class.getName()).addParameter(INTERFACE_KEY, MonitorService.class.getName());
String key = url.toServiceStringWithoutResolving();
Monitor monitor = MONITORS.get(key);
Future future = FUTURES.get(key);
if (monitor != null || future != null) {
return monitor;
}
LOCK.lock();
try {
monitor = MONITORS.get(key);
future = FUTURES.get(key);
if (monitor != null || future != null) {
return monitor;
}
final URL monitorUrl = url;
future = EXECUTOR.submit(() -> {
try {
Monitor m = createMonitor(monitorUrl);
MONITORS.put(key, m);
FUTURES.remove(key);
return m;
} catch (Throwable e) {
logger.warn("Create monitor failed, monitor data will not be collected until you fix this problem. monitorUrl: " + monitorUrl, e);
return null;
}
});
FUTURES.put(key, future);
return null;
} finally {
// unlock
LOCK.unlock();
}
}
protected abstract Monitor createMonitor(URL url);
}