spring-kafka ABSwitchCluster 源码
spring-kafka ABSwitchCluster 代码
文件路径：/spring-kafka/src/main/java/org/springframework/kafka/core/ABSwitchCluster.java
/*
* Copyright 2020 the original author or 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
*
* https://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.springframework.kafka.core;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Supplier;
import org.springframework.util.Assert;
/**
* A {@link Supplier} for bootstrap servers that can toggle between 2 lists of servers.
*
* @author Gary Russell
* @since 2.5
*
*/
public class ABSwitchCluster implements Supplier<String> {
private final AtomicBoolean which = new AtomicBoolean(true);
private final String primary;
private final String secondary;
/**
* Construct an instance with primary and secondary bootstrap servers.
* @param primary the primary.
* @param secondary the secondary.
*/
public ABSwitchCluster(String primary, String secondary) {
Assert.hasText(primary, "'primary' is required");
Assert.hasText(secondary, "'secondary' is required");
this.primary = primary;
this.secondary = secondary;
}
@Override
public String get() {
return this.which.get() ? this.primary : this.secondary;
}
/**
* Get whether or not the primary cluster is active.
* @return true for primary, false for secondary.
*/
public boolean isPrimary() {
return this.which.get();
}
/**
* Use the primary cluster.
*/
public void primary() {
this.which.set(true);
}
/**
* Use the secondary cluster.
*/
public void secondary() {
this.which.set(false);
}
}
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