org.apache.dubbo.rpc.cluster.Cluster Maven / Gradle / Ivy
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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.rpc.cluster;
import org.apache.dubbo.common.extension.Adaptive;
import org.apache.dubbo.common.extension.SPI;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.model.ScopeModel;
import org.apache.dubbo.rpc.model.ScopeModelUtil;
/**
* Cluster. (SPI, Singleton, ThreadSafe)
*
* Cluster
* Fault-Tolerant
*
*/
@SPI(Cluster.DEFAULT)
public interface Cluster {
String DEFAULT = "failover";
/**
* Merge the directory invokers to a virtual invoker.
*
* @param
* @param directory
* @return cluster invoker
* @throws RpcException
*/
@Adaptive
Invoker join(Directory directory, boolean buildFilterChain) throws RpcException;
static Cluster getCluster(ScopeModel scopeModel, String name) {
return getCluster(scopeModel, name, true);
}
static Cluster getCluster(ScopeModel scopeModel, String name, boolean wrap) {
if (StringUtils.isEmpty(name)) {
name = Cluster.DEFAULT;
}
return ScopeModelUtil.getApplicationModel(scopeModel).getExtensionLoader(Cluster.class).getExtension(name, wrap);
}
}