CachedEntryQueue (Apache HBase 1.4.11 API)

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

```
@InterfaceAudience.Private
public class CachedEntryQueue
extends Object
```
A memory-bound queue that will grow until an element brings total size larger than maxSize. From then on, only entries that are sorted larger than the smallest current entry will be inserted/replaced.
Use this when you want to find the largest elements (according to their ordering, not their heap size) that consume as close to the specified maxSize as possible. Default behavior is to grow just above rather than just below specified max.

Constructor Summary

Constructors
Constructor and Description

CachedEntryQueue(long maxSize, long blockSize)

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry> entry)` Attempt to add the specified entry to this queue.
`long`	`cacheSize()` Total size of all elements in this queue.
`Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry>`	`poll()`
`Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry>`	`pollLast()`

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

- Constructor Detail
  - CachedEntryQueue
```
public CachedEntryQueue(long maxSize,
                long blockSize)
```
    Parameters:
    maxSize - the target size of elements in the queue
    blockSize - expected average size of blocks
- Method Detail
  - add
```
public void add(Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry> entry)
```
    Attempt to add the specified entry to this queue.
    If the queue is smaller than the max size, or if the specified element is ordered after the smallest element in the queue, the element will be added to the queue. Otherwise, there is no side effect of this call.
    
    Parameters:
    entry - a bucket entry with key to try to add to the queue
  - poll
```
public Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry> poll()
```
    Returns:
    The next element in this queue, or null if the queue is empty.
  - pollLast
```
public Map.Entry<BlockCacheKey,org.apache.hadoop.hbase.io.hfile.bucket.BucketCache.BucketEntry> pollLast()
```
    Returns:
    The last element in this queue, or null if the queue is empty.
  - cacheSize
```
public long cacheSize()
```
    Total size of all elements in this queue.
    
    Returns:
    size of all elements currently in queue, in bytes

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