DefaultDnsCache.java — netty Source File

Source Code

/*
 * Copyright 2016 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.handler.codec.dns.DnsRecord;
import io.netty.util.internal.StringUtil;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.AbstractList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentMap;

import static io.netty.util.internal.ObjectUtil.checkNotNull;
import static io.netty.util.internal.ObjectUtil.checkPositiveOrZero;

/**
 * Default implementation of {@link DnsCache}, backed by a {@link ConcurrentMap}.
 * If any additional {@link DnsRecord} is used, no caching takes place.
 */
public class DefaultDnsCache implements DnsCache {

    private final Cache<DefaultDnsCacheEntry> resolveCache = new Cache<DefaultDnsCacheEntry>() {

        @Override
        protected boolean shouldReplaceAll(DefaultDnsCacheEntry entry) {
            return entry.cause() != null;
        }

        @Override
        protected boolean equals(DefaultDnsCacheEntry entry, DefaultDnsCacheEntry otherEntry) {
            if (entry.address() != null) {
                return entry.address().equals(otherEntry.address());
            }
            if (otherEntry.address() != null) {
                return false;
            }
            return entry.cause().equals(otherEntry.cause());
        }
    };
// ... (270 more lines)