netty5/resolver-dns/src/main/java/io/netty/resolver/dns/BiDnsQueryLifecycleObserver.java
田欧 e8efcd82a8 migrate java8: use requireNonNull (#8840)
Motivation:

We can just use Objects.requireNonNull(...) as a replacement for ObjectUtil.checkNotNull(....)

Modifications:

- Use Objects.requireNonNull(...)

Result:

Less code to maintain.
2019-02-04 10:32:25 +01:00

112 lines
3.2 KiB
Java

/*
* Copyright 2017 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:
*
* 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 io.netty.resolver.dns;
import io.netty.channel.ChannelFuture;
import io.netty.handler.codec.dns.DnsQuestion;
import io.netty.handler.codec.dns.DnsResponseCode;
import io.netty.util.internal.UnstableApi;
import java.net.InetSocketAddress;
import java.util.List;
import static java.util.Objects.requireNonNull;
/**
* Combines two {@link DnsQueryLifecycleObserver} into a single {@link DnsQueryLifecycleObserver}.
*/
@UnstableApi
public final class BiDnsQueryLifecycleObserver implements DnsQueryLifecycleObserver {
private final DnsQueryLifecycleObserver a;
private final DnsQueryLifecycleObserver b;
/**
* Create a new instance.
* @param a The {@link DnsQueryLifecycleObserver} that will receive events first.
* @param b The {@link DnsQueryLifecycleObserver} that will receive events second.
*/
public BiDnsQueryLifecycleObserver(DnsQueryLifecycleObserver a, DnsQueryLifecycleObserver b) {
this.a = requireNonNull(a, "a");
this.b = requireNonNull(b, "b");
}
@Override
public void queryWritten(InetSocketAddress dnsServerAddress, ChannelFuture future) {
try {
a.queryWritten(dnsServerAddress, future);
} finally {
b.queryWritten(dnsServerAddress, future);
}
}
@Override
public void queryCancelled(int queriesRemaining) {
try {
a.queryCancelled(queriesRemaining);
} finally {
b.queryCancelled(queriesRemaining);
}
}
@Override
public DnsQueryLifecycleObserver queryRedirected(List<InetSocketAddress> nameServers) {
try {
a.queryRedirected(nameServers);
} finally {
b.queryRedirected(nameServers);
}
return this;
}
@Override
public DnsQueryLifecycleObserver queryCNAMEd(DnsQuestion cnameQuestion) {
try {
a.queryCNAMEd(cnameQuestion);
} finally {
b.queryCNAMEd(cnameQuestion);
}
return this;
}
@Override
public DnsQueryLifecycleObserver queryNoAnswer(DnsResponseCode code) {
try {
a.queryNoAnswer(code);
} finally {
b.queryNoAnswer(code);
}
return this;
}
@Override
public void queryFailed(Throwable cause) {
try {
a.queryFailed(cause);
} finally {
b.queryFailed(cause);
}
}
@Override
public void querySucceed() {
try {
a.querySucceed();
} finally {
b.querySucceed();
}
}
}