dubbo AbstractRegistryFactory 源码
dubbo AbstractRegistryFactory 代码
文件路径:/dubbo-registry/dubbo-registry-api/src/main/java/org/apache/dubbo/registry/support/AbstractRegistryFactory.java
/*
* 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.registry.support;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.URLBuilder;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.registry.Registry;
import org.apache.dubbo.registry.RegistryFactory;
import org.apache.dubbo.registry.RegistryService;
import org.apache.dubbo.rpc.model.ApplicationModel;
import org.apache.dubbo.rpc.model.ScopeModelAware;
import static org.apache.dubbo.common.constants.CommonConstants.CHECK_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.INTERFACE_KEY;
import static org.apache.dubbo.common.constants.CommonConstants.TIMESTAMP_KEY;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_FAILED_CREATE_INSTANCE;
import static org.apache.dubbo.rpc.cluster.Constants.EXPORT_KEY;
import static org.apache.dubbo.rpc.cluster.Constants.REFER_KEY;
/**
* AbstractRegistryFactory. (SPI, Singleton, ThreadSafe)
*
* @see org.apache.dubbo.registry.RegistryFactory
*/
public abstract class AbstractRegistryFactory implements RegistryFactory, ScopeModelAware {
private static final ErrorTypeAwareLogger LOGGER = LoggerFactory.getErrorTypeAwareLogger(AbstractRegistryFactory.class);
private RegistryManager registryManager;
protected ApplicationModel applicationModel;
@Override
public void setApplicationModel(ApplicationModel applicationModel) {
this.applicationModel = applicationModel;
this.registryManager = applicationModel.getBeanFactory().getBean(RegistryManager.class);
}
@Override
public Registry getRegistry(URL url) {
if (registryManager == null) {
throw new IllegalStateException("Unable to fetch RegistryManager from ApplicationModel BeanFactory. " +
"Please check if `setApplicationModel` has been override.");
}
Registry defaultNopRegistry = registryManager.getDefaultNopRegistryIfDestroyed();
if (null != defaultNopRegistry) {
return defaultNopRegistry;
}
url = URLBuilder.from(url)
.setPath(RegistryService.class.getName())
.addParameter(INTERFACE_KEY, RegistryService.class.getName())
.removeParameter(TIMESTAMP_KEY)
.removeAttribute(EXPORT_KEY)
.removeAttribute(REFER_KEY)
.build();
String key = createRegistryCacheKey(url);
Registry registry = null;
boolean check = url.getParameter(CHECK_KEY, true) && url.getPort() != 0;
// Lock the registry access process to ensure a single instance of the registry
registryManager.getRegistryLock().lock();
try {
// double check
// fix https://github.com/apache/dubbo/issues/7265.
defaultNopRegistry = registryManager.getDefaultNopRegistryIfDestroyed();
if (null != defaultNopRegistry) {
return defaultNopRegistry;
}
registry = registryManager.getRegistry(key);
if (registry != null) {
return registry;
}
// create registry by spi/ioc
registry = createRegistry(url);
if (check && registry == null) {
throw new IllegalStateException("Can not create registry " + url);
}
if (registry != null) {
registryManager.putRegistry(key, registry);
}
} catch (Exception e) {
if (check) {
throw new RuntimeException("Can not create registry " + url, e);
} else {
// 1-11 Failed to obtain or create registry (service) object.
LOGGER.warn(REGISTRY_FAILED_CREATE_INSTANCE, "", "",
"Failed to obtain or create registry ", e);
}
} finally {
// Release the lock
registryManager.getRegistryLock().unlock();
}
return registry;
}
/**
* Create the key for the registries cache.
* This method may be overridden by the sub-class.
*
* @param url the registration {@link URL url}
* @return non-null
*/
protected String createRegistryCacheKey(URL url) {
return url.toServiceStringWithoutResolving();
}
protected abstract Registry createRegistry(URL url);
}
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