CachedBlock (Apache Accumulo Core 2.0.0 API)

java.lang.Object
- org.apache.accumulo.core.file.blockfile.cache.lru.CachedBlock

All Implemented Interfaces:

Comparable<CachedBlock>, HeapSize
```
public class CachedBlock
extends Object
implements HeapSize, Comparable<CachedBlock>
```
Represents an entry in the configurable block cache.
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.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class CachedBlock.BlockPriority

Field Summary

Fields
Modifier and Type Field Description

static long PER_BLOCK_OVERHEAD

Constructor Summary

Constructors
Constructor Description

CachedBlock(String blockName, byte[] buf, long accessTime, boolean inMemory)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`access(long accessTime)`	Block has been accessed.
`int`	`compareTo(CachedBlock that)`
`boolean`	`equals(Object obj)`
`long`	`evicted(AtomicLong totalSize)`
`byte[]`	`getBuffer()`
`<T extends CacheEntry.Weighable> T`	`getIndex(Supplier<T> supplier)`
`String`	`getName()`
`CachedBlock.BlockPriority`	`getPriority()`
`int`	`hashCode()`
`long`	`heapSize()`
`long`	`recordSize(AtomicLong totalSize)`

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

CachedBlock

public CachedBlock(String blockName,
                   byte[] buf,
                   long accessTime,
                   boolean inMemory)

Method Detail

access
```
public void access(long accessTime)
```
Block has been accessed. Update its local access time.

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.

hashCode
```
public int hashCode()
```
Overrides:

hashCode in class Object

equals
```
public boolean equals(Object obj)
```
Overrides:

equals in class Object

compareTo
```
public int compareTo(CachedBlock that)
```
Specified by:

compareTo in interface Comparable<CachedBlock>

getName
```
public String getName()
```

getPriority

public CachedBlock.BlockPriority getPriority()

getBuffer
```
public byte[] getBuffer()
```

getIndex

public <T extends CacheEntry.Weighable> T getIndex(Supplier<T> supplier)

recordSize

public long recordSize(AtomicLong totalSize)

evicted

public long evicted(AtomicLong totalSize)