视频解码枚举
public enum VideoType {
WMV("wmv"),
AVI("avi");
private String desc;
VideoType(String desc) {
this.desc = desc;
}
public String getDesc() {
return desc;
}
}
解码接口
public interface IDecoder {
VideoType type();
String decode(String data);
}
WMV解码功能
@Service
public class WMVDecoder implements IDecoder {
@Override
public VideoType type() {
return VideoType.WMV;
}
@Override
public String decode(String data) {
return this.type().getDesc() + ": " + data;
}
}
AVI解码功能
@Service
@Slf4j
public class AVIDecoder implements IDecoder, InitializingBean {
@Override
public VideoType type() {
return VideoType.AVI;
}
@Override
public String decode(String data) {
return this.type().getDesc() + " : " + data;
}
@Override
public void afterPropertiesSet() throws Exception {
log.info("init AVIDecoder afterPropertiesSet");
}
}
解码Manager
实现 BeanPostProcessor接口,并缓存 VideoType 与 IDecoder对应关系
@Service
@Slf4j
public class DecodeManager implements BeanPostProcessor {
private static final Map<VideoType, IDecoder> viderTypeInedx =
new HashMap<>(VideoType.values().length);
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (!(bean instanceof IDecoder)) {
return bean;
}
IDecoder decoder = (IDecoder) bean;
VideoType type = decoder.type();
if (viderTypeInedx.containsKey(type)) {
throw new IllegalStateException("重复注册");
}
log.info("Load Decode {} for video type{} ", decoder.getClass(), type.getDesc());
viderTypeInedx.put(type, decoder);
return null;
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (!(bean instanceof IDecoder)) {
return bean;
}
log.info("BeanPostProcessor after init :{}", bean.getClass());
return null;
}
public String decode(VideoType type, String data) {
String result = null;
switch (type) {
case AVI:
result = viderTypeInedx.get(VideoType.AVI).decode(data);
break;
case WMV:
result = viderTypeInedx.get(VideoType.WMV).decode(data);
break;
default:
log.info("error");
}
return result;
}
}
测试用例:
@Autowired
private DecodeManager decodeManager;
@Test
public void testDecode() {
//获取随机解码器
VideoType videoType = VideoType.values()[new Random().nextInt(VideoType.values().length)];
decodeManager.decode(videoType, "解码数据~");
}