BucketCache.BucketEntry (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry

All Implemented Interfaces:

Serializable

Enclosing class:

BucketCache
```
static class BucketCache.BucketEntry
extends Object
implements Serializable
```
Item in cache. We expect this to be where most memory goes. Java uses 8 bytes just for object headers; after this, we want to use as little as possible - so we only use 8 bytes, but in order to do so we end up messing around with all this Java casting stuff. Offset stored as 5 bytes that make up the long. Doubt we'll see devices this big for ages. Offsets are divided by 256. So 5 bytes gives us 256TB or so.

Field Summary

Fields
Modifier and Type	Field and Description
`private long`	`accessCounter`
`private long`	`cachedTime` Time this block was cached.
`(package private) static Comparator<BucketCache.BucketEntry>`	`COMPARATOR`
`(package private) byte`	`deserialiserIndex`
`private int`	`length`
`private byte`	`offset1`
`private int`	`offsetBase`
`private BlockPriority`	`priority`
`private static long`	`serialVersionUID`

Constructor Summary

Constructors
Constructor and Description
`BucketCache.BucketEntry(long offset, int length, long accessCounter, boolean inMemory)`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`access(long accessCounter)` Block has been accessed.
`protected CacheableDeserializer<Cacheable>`	`deserializerReference(UniqueIndexMap<Integer> deserialiserMap)`
`long`	`getCachedTime()`
`int`	`getLength()`
`BlockPriority`	`getPriority()`
`(package private) long`	`offset()`
`protected void`	`setDeserialiserReference(CacheableDeserializer<Cacheable> deserializer, UniqueIndexMap<Integer> deserialiserMap)`
`private void`	`setOffset(long value)`

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

Field Detail

serialVersionUID
```
private static final long serialVersionUID
```
See Also:
Constant Field Values

COMPARATOR

static final Comparator<BucketCache.BucketEntry> COMPARATOR

offsetBase
```
private int offsetBase
```

length
```
private int length
```

offset1
```
private byte offset1
```

deserialiserIndex
```
byte deserialiserIndex
```

accessCounter
```
private volatile long accessCounter
```

priority
```
private BlockPriority priority
```

cachedTime
```
private final long cachedTime
```
Time this block was cached. Presumes we are created just before we are added to the cache.

Constructor Detail

BucketCache.BucketEntry

BucketCache.BucketEntry(long offset,
                       int length,
                       long accessCounter,
                       boolean inMemory)

Method Detail

offset
```
long offset()
```

setOffset
```
private void setOffset(long value)
```

getLength
```
public int getLength()
```

deserializerReference

protected CacheableDeserializer<Cacheable> deserializerReference(UniqueIndexMap<Integer> deserialiserMap)

setDeserialiserReference

protected void setDeserialiserReference(CacheableDeserializer<Cacheable> deserializer,
                            UniqueIndexMap<Integer> deserialiserMap)

access
```
public void access(long accessCounter)
```
Block has been accessed. Update its local access counter.

getPriority
```
public BlockPriority getPriority()
```

getCachedTime
```
public long getCachedTime()
```

Class BucketCache.BucketEntry

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

serialVersionUID

COMPARATOR

offsetBase

length

offset1

deserialiserIndex

accessCounter

priority

cachedTime

Constructor Detail

BucketCache.BucketEntry

Method Detail

offset

setOffset

getLength

deserializerReference

setDeserialiserReference

access

getPriority

getCachedTime