DataBlockHeader (Apache Pulsar :: Tiered Storage :: JCloud 2.10.1.10-rc-arrowstreet API)

All Known Implementing Classes:

DataBlockHeaderImpl, StreamingDataBlockHeaderImpl
```
@Unstable
public interface DataBlockHeader
```
The data block header in tiered storage for each data block.
Currently, It is in format: [ magic_word -- int ][ block_len -- int ][ first_entry_id -- long][padding] with the size: 4 + 4 + 8 + padding = 128 Bytes

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getBlockLength()`	Get the length of the block in bytes, including the header.
`long`	`getFirstEntryId()`	Get the message entry Id for the first message that stored in this data block.
`long`	`getHeaderLength()`	Get the size of this DataBlockHeader.
`java.io.InputStream`	`toStream()`	Get the content of the data block header as InputStream.

- Method Detail
  - getBlockLength
```
long getBlockLength()
```
    Get the length of the block in bytes, including the header.
  - getFirstEntryId
```
long getFirstEntryId()
```
    Get the message entry Id for the first message that stored in this data block.
  - getHeaderLength
```
long getHeaderLength()
```
    Get the size of this DataBlockHeader.
  - toStream
```
java.io.InputStream toStream()
```
    Get the content of the data block header as InputStream. Read out in current format.