private static IntHashMap<MethodTypeEnum> toMethodTypeMap() {
        IntHashMap<MethodTypeEnum> methodTypeEnumMap = new IntHashMap<>();
        for (MethodTypeEnum methodType : values()) {
            methodTypeEnumMap.put(methodType.getCode(), methodType);
        }
        return methodTypeEnumMap;
    }
readable class of MethodType
@author Woonduk Kang(emeroad)
commons-server/src/main/java/com/navercorp/pinpoint/common/server/bo/MethodTypeEnum.java