github.com/geniusesgroup/libgo@v0.0.0-20220713101832-828057a9d3d4/protocol/storage-block.go (about)

     1  /* For license and copyright information please see LEGAL file in repository */
     2  
     3  package protocol
     4  
     5  // StorageBlockVolatile or StorageMemory is the interface that show how an app access to volatile storage devices.
     6  // Usually dev must not use this interface due to it can damage any data written by objects, files, records, k/v interfaces
     7  type StorageBlockVolatile interface {
     8  	// return volume capacity
     9  	Cap() int
    10  	// Extended length may vary of requested cap, Due to Extend() is base on storage device block size not bytes,
    11  	// e.g. on SSDs block sizes are 256*page-size like 256*4(page-size)=1024(B)=1(MB)
    12  	Extend(cap int) (extended int, err Error)
    13  
    14  	// Change the return data not flush to any non-volatile storages. Use Write() to change data.
    15  	Read(offset, data []byte) (err Error)
    16  	// Write at more than block capacity cause block extend. extend capacity isn't equal to write length.
    17  	Write(offset, data []byte) (err Error)
    18  	Erase(offset, limit int) (err Error)
    19  
    20  	Copy(desOffset, srcOffset int, limit int) (err Error)
    21  	Move(desOffset, srcOffset int, limit int) (err Error)
    22  
    23  	Search(data []byte, offset int) (loc int, err Error)
    24  }
    25  
    26  // StorageBlock is the interface that show how an app access to storage devices.
    27  // Usually dev must not use this interface due to it can damage any data written by objects, files, records or k/v interfaces
    28  type StorageBlock interface {
    29  	StorageBlockVolatile
    30  
    31  	// Flush force the storage device to write any changes to data (store in cache) before call Flush.
    32  	Flush() (err Error)
    33  }