BlockId (Alluxio Core - Common Utilities 295 API)

java.lang.Object
- alluxio.master.block.BlockId

```
@ThreadSafe
public final class BlockId
extends java.lang.Object
```
This class provides a set of methods related to block IDs. Each block ID is a value of long with the following two parts:
- The most significant 5 bytes (40 bits) represent the container ID of this block and
- The least significant 3 bytes (24 bits) represent the sequence number of this block in the container.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static long`	`createBlockId(long containerId, long sequenceNumber)`
`static long`	`getContainerId(long blockId)`
`static long`	`getFileId(long blockId)`
`static long`	`getMaxSequenceNumber()`
`static long`	`getSequenceNumber(long blockId)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - createBlockId
```
public static long createBlockId(long containerId,
                                 long sequenceNumber)
```
    Parameters:
    
    containerId - the container ID to create the block ID with
    
    sequenceNumber - the sequence number to create the block ID with
    
    Returns:
    
    the block ID constructed with the container ID and sequence number
  - getContainerId
```
public static long getContainerId(long blockId)
```
    Parameters:
    
    blockId - the block ID to get the container ID for
    
    Returns:
    
    the container ID of a specified block ID
  - getFileId
```
public static long getFileId(long blockId)
```
    Parameters:
    
    blockId - the block ID to get the file ID for
    
    Returns:
    
    the file ID of a specified block ID
  - getSequenceNumber
```
public static long getSequenceNumber(long blockId)
```
    Parameters:
    
    blockId - the block ID to get the sequence number for
    
    Returns:
    
    the sequence number of the specified block ID
  - getMaxSequenceNumber
```
public static long getMaxSequenceNumber()
```
    Returns:
    
    the maximum possible sequence number for block IDs