LruCachedBlock (Apache HBase 1.4.11 API)

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

All Implemented Interfaces:

Comparable<LruCachedBlock>, HeapSize
```
@InterfaceAudience.Private
public class LruCachedBlock
extends Object
implements HeapSize, Comparable<LruCachedBlock>
```
Represents an entry in the LruBlockCache.
Makes the block memory-aware with HeapSize and Comparable to sort by access time for the LRU. It also takes care of priority by either instantiating as in-memory or handling the transition from single to multiple access.

Field Summary

Fields
Modifier and Type Field and Description

static long PER_BLOCK_OVERHEAD

Constructor Summary

Constructors
Constructor and Description
`LruCachedBlock(BlockCacheKey cacheKey, Cacheable buf, long accessTime)`
`LruCachedBlock(BlockCacheKey cacheKey, Cacheable buf, long accessTime, boolean inMemory)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`access(long accessTime)` Block has been accessed.
`int`	`compareTo(LruCachedBlock that)`
`boolean`	`equals(Object obj)`
`Cacheable`	`getBuffer()`
`long`	`getCachedTime()`
`BlockCacheKey`	`getCacheKey()`
`BlockPriority`	`getPriority()`
`int`	`hashCode()`
`long`	`heapSize()`

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

Field Detail

PER_BLOCK_OVERHEAD

public static final long PER_BLOCK_OVERHEAD

Constructor Detail

LruCachedBlock

public LruCachedBlock(BlockCacheKey cacheKey,
              Cacheable buf,
              long accessTime)

LruCachedBlock

public LruCachedBlock(BlockCacheKey cacheKey,
              Cacheable buf,
              long accessTime,
              boolean inMemory)

Method Detail
- access
```
public void access(long accessTime)
```
  Block has been accessed.
  
  Parameters:
  accessTime - Last access; this is actually a incremented sequence number rather than an actual time.
- getCachedTime
```
public long getCachedTime()
```
  Returns:
  Time we were cached at in nano seconds.
- heapSize
```
public long heapSize()
```
  Specified by:
  
  heapSize in interface HeapSize
  
  Returns:
  Approximate 'exclusive deep size' of implementing object. Includes count of payload and hosting object sizings.
- compareTo
```
public int compareTo(LruCachedBlock that)
```
  Specified by:
  
  compareTo in interface Comparable<LruCachedBlock>
- hashCode
```
public int hashCode()
```
  Overrides:
  
  hashCode in class Object
- equals
```
public boolean equals(Object obj)
```
  Overrides:
  
  equals in class Object
- getBuffer
```
public Cacheable getBuffer()
```
- getCacheKey
```
public BlockCacheKey getCacheKey()
```
- getPriority
```
public BlockPriority getPriority()
```

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