com.alibaba.nacos.shaded.io.grpc.ConfiguratorRegistry Maven / Gradle / Ivy
/*
* Copyright 2024 The gRPC 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 com.alibaba.nacos.shaded.io.grpc;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import com.alibaba.nacos.shaded.javax.annotation.concurrent.GuardedBy;
/**
* A registry for {@link Configurator} instances.
*
* This class is responsible for maintaining a list of configurators and providing access to
* them. The default registry can be obtained using {@link #getDefaultRegistry()}.
*/
final class ConfiguratorRegistry {
private static ConfiguratorRegistry instance;
@GuardedBy("this")
private boolean wasConfiguratorsSet;
@GuardedBy("this")
private boolean configFrozen;
@GuardedBy("this")
private List configurators = Collections.emptyList();
ConfiguratorRegistry() {}
/**
* Returns the default global instance of the configurator registry.
*/
public static synchronized ConfiguratorRegistry getDefaultRegistry() {
if (instance == null) {
instance = new ConfiguratorRegistry();
}
return instance;
}
/**
* Sets the configurators in this registry. This method can only be called once.
*
* @param configurators the configurators to set
* @throws IllegalStateException if this method is called more than once
*/
public synchronized void setConfigurators(List configurators) {
if (configFrozen) {
throw new IllegalStateException("Configurators are already set");
}
this.configurators = Collections.unmodifiableList(new ArrayList<>(configurators));
configFrozen = true;
wasConfiguratorsSet = true;
}
/**
* Returns a list of the configurators in this registry.
*/
public synchronized List getConfigurators() {
configFrozen = true;
return configurators;
}
public synchronized boolean wasSetConfiguratorsCalled() {
return wasConfiguratorsSet;
}
}