}
        synchronized ( this.addressCache ) {
            for ( int i = 0; i < addrs.length; i++ ) {
                CacheEntry entry = this.addressCache.get(addrs[ i ].hostName);
                if ( entry == null ) {
                    entry = new CacheEntry(addrs[ i ].hostName, addrs[ i ], expiration);
                    this.addressCache.put(addrs[ i ].hostName, entry);
                }
                else {