如何避免使用try catch语句块，及性能分析

@Override
public void filterWrite(NextFilter nextFilter, IoSession session,
WriteRequest writeRequest) throws Exception {

Object data = writeRequest.getMessage();

if (data instanceof IoBuffer) {
write(session, (IoBuffer) data);
} else {
throw new IllegalArgumentException(
"This filter should only buffer IoBuffer objects");
}
//        按照的平时的方案。
//        try {
//            IoBuffer data = (IoBuffer) writeRequest.getMessage();
//            write(session, data);
//        } catch (ClassCastException e) {
//            throw new IllegalArgumentException(
//                    "This filter should only buffer IoBuffer objects");
//        }
}

private void write(IoSession session, IoBuffer data) {
IoBuffer dest = buffersMap.putIfAbsent(session,
new IoBufferLazyInitializer(bufferSize));

write(session, data, dest);
}