566566db3a
Motivation: DnsCache (an interface) is coupled to DnsCacheEntry (a final class). This means that DnsCache implementations can't implement their own DnsCacheEntry objects if the default behavior isn't appropriate. Modifications: - DnsCacheEntry should be moved to DefaultDnsCache as it is an implementation detail - DnsCache#cache(..) should return a new DnsCacheEntry - The methods which from DnsCacheEntry that were used outside the scope of DefaultDnsCache should be moved into an interface Result: DnsCache is more extensible and not tightly coupled to a default implementation of DnsCacheEntry.
41 lines
1.3 KiB
Java
41 lines
1.3 KiB
Java
/*
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* Copyright 2017 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.resolver.dns;
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import io.netty.util.internal.UnstableApi;
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import java.net.InetAddress;
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/**
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* Represents the results from a previous DNS query which can be cached.
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*/
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@UnstableApi
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public interface DnsCacheEntry {
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/**
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* Get the resolved address.
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* <p>
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* This may be null if the resolution failed, and in that case {@link #cause()} will describe the failure.
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* @return the resolved address.
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*/
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InetAddress address();
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/**
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* If the DNS query failed this will provide the rational.
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* @return the rational for why the DNS query failed, or {@code null} if the query hasn't failed.
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*/
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Throwable cause();
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}
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