org.apache.juli.logging.net.logstash.logback.appender.destination.RandomDestinationConnectionStrategy Maven / Gradle / Ivy
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/*
* Copyright 2013-2023 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
*
* 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.juli.logging.net.logstash.logback.appender.destination;
import java.util.Objects;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.UnaryOperator;
/**
* This strategy attempts connections to the destination in a random order.
* If a connection fails, the next random destination is attempted.
*
* The connectionTTL can be set to gracefully close connections after a specific duration.
* This will force the the appender to reattempt to connect to the next random destination.
*/
public class RandomDestinationConnectionStrategy extends DestinationConnectionStrategyWithTtl {
/**
* Random number generator. Function argument is the maximum value allowed for the generated
* random int number.
*/
private final UnaryOperator randomSupplier;
public RandomDestinationConnectionStrategy() {
this(bound -> ThreadLocalRandom.current().nextInt(bound));
}
public RandomDestinationConnectionStrategy(UnaryOperator randomSupplier) {
this.randomSupplier = Objects.requireNonNull(randomSupplier);
}
@Override
public int selectNextDestinationIndex(int previousDestinationIndex, int numDestinations) {
return randomSupplier.apply(numDestinations);
}
}