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public class RecordHeader implements Header {
    private ByteBuffer keyBuffer;
    private volatile String key;
    private ByteBuffer valueBuffer;
    private volatile byte[] value;

...

    public String key() {
        if (key == null) {
            synchronized (this) {
                if (key == null) {
                    key = Utils.utf8(keyBuffer, keyBuffer.remaining());
                    keyBuffer = null;
                }
            }
        }
        return key;
    }

    public byte[] value() {
        if (value == null) {
            synchronized (this) {
                if (value == null && valueBuffer != null) {
                    value = Utils.toArray(valueBuffer);
                    valueBuffer = null;
                }
            }
        }
        return value;
    }
}