DefaultDnsCacheEntry Class — netty Architecture

Source Code

resolver-dns/src/main/java/io/netty/resolver/dns/DefaultDnsCache.java lines 185–256

    private static final class DefaultDnsCacheEntry implements DnsCacheEntry {
        private final String hostname;
        private final InetAddress address;
        private final Throwable cause;
        private final int hash;

        DefaultDnsCacheEntry(String hostname, InetAddress address) {
            this.hostname = hostname;
            this.address = address;
            cause = null;
            hash = System.identityHashCode(this);
        }

        DefaultDnsCacheEntry(String hostname, Throwable cause) {
            this.hostname = hostname;
            this.cause = cause;
            address = null;
            hash = System.identityHashCode(this);
        }

        private DefaultDnsCacheEntry(DefaultDnsCacheEntry entry) {
            this.hostname = entry.hostname;
            if (entry.cause == null) {
                this.address = entry.address;
                this.cause = null;
            } else {
                this.address = null;
                this.cause = copyThrowable(entry.cause);
            }
            this.hash = entry.hash;
        }

        @Override
        public InetAddress address() {
            return address;
        }

        @Override
        public Throwable cause() {
            return cause;
        }

        String hostname() {
            return hostname;
        }

        @Override
        public String toString() {
            if (cause != null) {
                return hostname + '/' + cause;
            } else {
                return address.toString();
            }
        }

        @Override
        public int hashCode() {
            return hash;
        }

        @Override
        public boolean equals(Object obj) {
            return (obj instanceof DefaultDnsCacheEntry) && ((DefaultDnsCacheEntry) obj).hash == hash;
        }

        DnsCacheEntry copyIfNeeded() {
            if (cause == null) {
                return this;
            }
            return new DefaultDnsCacheEntry(this);
        }
    }