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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
/*
* 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 static io.netty.resolver.dns.DnsAddressDecoder.decodeAddress;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.List;
import io.netty.channel.Channel;
import io.netty.channel.EventLoop;
import io.netty.handler.codec.dns.DnsRecord;
import io.netty.handler.codec.dns.DnsRecordType;
import io.netty.util.concurrent.Promise;
final class DnsAddressResolveContext extends DnsResolveContext {
private final DnsCache resolveCache;
private final AuthoritativeDnsServerCache authoritativeDnsServerCache;
private final boolean completeEarlyIfPossible;
DnsAddressResolveContext(DnsNameResolver parent, Channel channel,
Promise> originalPromise, String hostname, DnsRecord[] additionals,
DnsServerAddressStream nameServerAddrs, int allowedQueries, DnsCache resolveCache,
AuthoritativeDnsServerCache authoritativeDnsServerCache,
boolean completeEarlyIfPossible) {
super(parent, channel, originalPromise, hostname, DnsRecord.CLASS_IN,
parent.resolveRecordTypes(), additionals, nameServerAddrs, allowedQueries);
this.resolveCache = resolveCache;
this.authoritativeDnsServerCache = authoritativeDnsServerCache;
this.completeEarlyIfPossible = completeEarlyIfPossible;
}
@Override
DnsResolveContext newResolverContext(DnsNameResolver parent, Channel channel,
Promise> originalPromise,
String hostname,
int dnsClass, DnsRecordType[] expectedTypes,
DnsRecord[] additionals,
DnsServerAddressStream nameServerAddrs, int allowedQueries) {
return new DnsAddressResolveContext(parent, channel, originalPromise, hostname, additionals,
nameServerAddrs, allowedQueries, resolveCache, authoritativeDnsServerCache, completeEarlyIfPossible);
}
@Override
InetAddress convertRecord(DnsRecord record, String hostname, DnsRecord[] additionals, EventLoop eventLoop) {
return decodeAddress(record, hostname, parent.isDecodeIdn());
}
@Override
List filterResults(List unfiltered) {
Collections.sort(unfiltered, PreferredAddressTypeComparator.comparator(parent.preferredAddressType()));
return unfiltered;
}
@Override
boolean isCompleteEarly(InetAddress resolved) {
return completeEarlyIfPossible && parent.preferredAddressType().addressType() == resolved.getClass();
}
@Override
boolean isDuplicateAllowed() {
// We don't want include duplicates to mimic JDK behaviour.
return false;
}
@Override
void cache(String hostname, DnsRecord[] additionals,
DnsRecord result, InetAddress convertedResult) {
resolveCache.cache(hostname, additionals, convertedResult, result.timeToLive(),
channel().eventLoop());
}
@Override
void cache(String hostname, DnsRecord[] additionals, UnknownHostException cause) {
resolveCache.cache(hostname, additionals, cause, channel().eventLoop());
}
@Override
void doSearchDomainQuery(String hostname, Promise> nextPromise) {
// Query the cache for the hostname first and only do a query if we could not find it in the cache.
if (!DnsNameResolver.doResolveAllCached(hostname, additionals, nextPromise, resolveCache,
parent.searchDomains(), parent.ndots(), parent.resolvedInternetProtocolFamiliesUnsafe())) {
super.doSearchDomainQuery(hostname, nextPromise);
}
}
@Override
DnsCache resolveCache() {
return resolveCache;
}
@Override
AuthoritativeDnsServerCache authoritativeDnsServerCache() {
return authoritativeDnsServerCache;
}
}
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