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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
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/*
* Copyright 2018 The Netty Project
*
* The Netty Project 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:
*
* 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 io.netty.resolver.dns;
import io.netty.channel.EventLoop;
import io.netty.util.AsciiString;
import java.util.List;
import static io.netty.util.internal.ObjectUtil.*;
/**
* Default implementation of a {@link DnsCnameCache}.
*/
public final class DefaultDnsCnameCache implements DnsCnameCache {
private final int minTtl;
private final int maxTtl;
private final Cache cache = new Cache() {
@Override
protected boolean shouldReplaceAll(String entry) {
// Only one 1:1 mapping is supported as specified in the RFC.
return true;
}
@Override
protected boolean equals(String entry, String otherEntry) {
return AsciiString.contentEqualsIgnoreCase(entry, otherEntry);
}
};
/**
* Create a cache that respects the TTL returned by the DNS server.
*/
public DefaultDnsCnameCache() {
this(0, Cache.MAX_SUPPORTED_TTL_SECS);
}
/**
* Create a cache.
*
* @param minTtl the minimum TTL
* @param maxTtl the maximum TTL
*/
public DefaultDnsCnameCache(int minTtl, int maxTtl) {
this.minTtl = Math.min(Cache.MAX_SUPPORTED_TTL_SECS, checkPositiveOrZero(minTtl, "minTtl"));
this.maxTtl = Math.min(Cache.MAX_SUPPORTED_TTL_SECS, checkPositive(maxTtl, "maxTtl"));
if (minTtl > maxTtl) {
throw new IllegalArgumentException(
"minTtl: " + minTtl + ", maxTtl: " + maxTtl + " (expected: 0 <= minTtl <= maxTtl)");
}
}
@SuppressWarnings("unchecked")
@Override
public String get(String hostname) {
List extends String> cached = cache.get(checkNotNull(hostname, "hostname"));
if (cached == null || cached.isEmpty()) {
return null;
}
// We can never have more then one record.
return cached.get(0);
}
@Override
public void cache(String hostname, String cname, long originalTtl, EventLoop loop) {
checkNotNull(hostname, "hostname");
checkNotNull(cname, "cname");
checkNotNull(loop, "loop");
cache.cache(hostname, cname, Math.max(minTtl, (int) Math.min(maxTtl, originalTtl)), loop);
}
@Override
public void clear() {
cache.clear();
}
@Override
public boolean clear(String hostname) {
return cache.clear(checkNotNull(hostname, "hostname"));
}
// Package visibility for testing purposes
int minTtl() {
return minTtl;
}
// Package visibility for testing purposes
int maxTtl() {
return maxTtl;
}
}
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