This variant retrieves {@link Class#getDeclaredFields()} from a local cache in order to avoid the JVM's SecurityManager check and defensive array copy

获取SPI扩展实例

返回标准path / => / abc => /abc /abc/2020 => /abc/2020 /abc/2020/ => /abc/2020 @param path @return

Return the hash for the reference.

Return the next reference in the chain, or {@code null} if none.

Determine whether the given object is an array: either an Object array or a primitive array. @param obj the object to check

Check if the given class represents a primitive wrapper, i.e. Boolean, Byte, Character, Short, Integer, Long, Float, Double, or Void. @param clazz the

生成新的traceId @return

Release this entry and ensure that it will be returned from {@code ReferenceManager#pollForPurge()}.

Signals a waiting take. Called only from put/offer (which do not otherwise ordinarily lock takeLock.)

Calculate a shift value that can be used to create a power-of-two value between the specified maximum and minimum values. @param minimumValue the mini

Returns a capacity that is sufficient to keep the map from being resized as long as it grows no larger than expectedSize and the load factor is ≥ its

在指定路径下 创建文件 如果文件已经存在则直接覆盖 @param rootPath @param filename @param in 不会关闭流 @return

Factory method used to create a new {@link Reference}. @param entry the entry contained in the reference @param hash the hash @param next the next ref

Attempt to find a {@link Field field} on the supplied {@link Class} with the supplied {@code name}. Searches all superclasses up to {@link Object}. @p

文件内容MD5 @return

Return the total number of references in this segment.

Get the field represented by the supplied {@link Field field object} on the specified {@link Object target object}. In accordance with {@link Field#ge

Get the hash for a given object, apply an additional hash function to reduce collisions. This implementation uses the same Wang/Jenkins algorithm as {

文件扩展名 例如: .png .jpg .jpeg .txt @return

初始化

创建多级目录 @param ftpClient @param path @return @throws IOException

Return as hash code for the given object. @param obj @return

Return any reference that has been garbage collected and can be purged from the underlying structure or {@code null} if no references need purging. Th