/*
* Copyright 1999-2011 Alibaba Group.
*
* 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 com.alibaba.dubbo.registry.support;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;
import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.registry.Registry;
import com.alibaba.dubbo.registry.RegistryFactory;
import com.alibaba.dubbo.registry.RegistryService;
/**
* AbstractRegistryFactory. (SPI, Singleton, ThreadSafe)
*
* @see com.alibaba.dubbo.registry.RegistryFactory
* @author william.liangf
*/
public abstract class AbstractRegistryFactory implements RegistryFactory {
// 日志输出
private static final Logger LOGGER = LoggerFactory.getLogger(AbstractRegistryFactory.class);
// 注册中心获取过程锁
private static final ReentrantLock LOCK = new ReentrantLock();
// 注册中心集合 Map<RegistryAddress, Registry>
private static final Map<String, Registry> REGISTRIES = new ConcurrentHashMap<String, Registry>();
/**
* 获取所有注册中心
*
* @return 所有注册中心
*/
public static Collection<Registry> getRegistries() {
return Collections.unmodifiableCollection(REGISTRIES.values());
}
/**
* 关闭所有已创建注册中心
*/
public static void destroyAll() {
if (LOGGER.isInfoEnabled()) {
LOGGER.info("Close all registries " + getRegistries());
}
// 锁定注册中心关闭过程
LOCK.lock();
try {
for (Registry registry : getRegistries()) {
try {
registry.destroy();
} catch (Throwable e) {
LOGGER.error(e.getMessage(), e);
}
}
REGISTRIES.clear();
} finally {
// 释放锁
LOCK.unlock();
}
}
public Registry getRegistry(URL url) {
url = url.setPath(RegistryService.class.getName()).addParameter(Constants.INTERFACE_KEY, RegistryService.class.getName());
String key = url.toServiceString();
// 锁定注册中心获取过程，保证注册中心单一实例
LOCK.lock();
try {
Registry registry = REGISTRIES.get(key);
if (registry != null) {
return registry;
}
registry = createRegistry(url);
if (registry == null) {
throw new IllegalStateException("Can not create registry " + url);
}
REGISTRIES.put(key, registry);
return registry;
} finally {
// 释放锁
LOCK.unlock();
}
}
protected abstract Registry createRegistry(URL url);
}