BlockCacheKey (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.io.hfile.BlockCacheKey

All Implemented Interfaces:

Serializable, HeapSize
```
@InterfaceAudience.Private
public class BlockCacheKey
extends Object
implements HeapSize, Serializable
```
Cache Key for use with implementations of BlockCache

See Also:
Serialized Form

Field Summary

Fields
Modifier and Type Field and Description

static long FIXED_OVERHEAD

Constructor Summary

Constructors
Constructor and Description
`BlockCacheKey(String hfileName, long offset)` Construct a new BlockCacheKey
`BlockCacheKey(String hfileName, long offset, boolean isPrimaryReplica, BlockType blockType)`

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object o)`
`BlockType`	`getBlockType()`
`String`	`getHfileName()`
`long`	`getOffset()`
`int`	`hashCode()`
`long`	`heapSize()` Strings have two bytes per character due to default Java Unicode encoding (hence length times 2).
`boolean`	`isPrimary()`
`String`	`toString()`

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

- Field Detail
  - FIXED_OVERHEAD
```
public static final long FIXED_OVERHEAD
```
- Constructor Detail
  - BlockCacheKey
```
public BlockCacheKey(String hfileName,
             long offset)
```
    Construct a new BlockCacheKey
    
    Parameters:
    hfileName - The name of the HFile this block belongs to.
    offset - Offset of the block into the file
  - BlockCacheKey
```
public BlockCacheKey(String hfileName,
             long offset,
             boolean isPrimaryReplica,
             BlockType blockType)
```
- Method Detail
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
  - heapSize
```
public long heapSize()
```
    Strings have two bytes per character due to default Java Unicode encoding (hence length times 2).
    
    Specified by:
    
    heapSize in interface HeapSize
    
    Returns:
    Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.
  - getHfileName
```
public String getHfileName()
```
    Returns:
    The hfileName portion of this cache key
  - isPrimary
```
public boolean isPrimary()
```
  - getOffset
```
public long getOffset()
```
  - getBlockType
```
public BlockType getBlockType()
```

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