SegmentDataManager (Pinot local segment implementations 1.0.0 API)

java.lang.Object
- org.apache.pinot.segment.local.data.manager.SegmentDataManager

```
public abstract class SegmentDataManager
extends Object
```
Base segment data manager to maintain reference count for the segment.

Constructor Summary

Constructors
Constructor Description

SegmentDataManager()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`decreaseReferenceCount()`	Decreases the reference count.
`void`	`destroy()`	Destroys the data manager and releases all the resources allocated.
`protected abstract void`	`doDestroy()`
`long`	`getLoadTimeMs()`
`int`	`getReferenceCount()`
`abstract IndexSegment`	`getSegment()`
`abstract String`	`getSegmentName()`
`boolean`	`increaseReferenceCount()`	Increases the reference count.

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

- Constructor Detail
  - SegmentDataManager
```
public SegmentDataManager()
```
- Method Detail
  - getLoadTimeMs
```
public long getLoadTimeMs()
```
  - getReferenceCount
```
public int getReferenceCount()
```
  - increaseReferenceCount
```
public boolean increaseReferenceCount()
```
    Increases the reference count. Should be called when acquiring the segment.
    
    Returns:
    
    Whether the segment is still valid (i.e. reference count not 0)
  - decreaseReferenceCount
```
public boolean decreaseReferenceCount()
```
    Decreases the reference count. Should be called when releasing or dropping the segment.
    
    Returns:
    
    Whether the segment can be destroyed (i.e. reference count is 0)
  - getSegmentName
```
public abstract String getSegmentName()
```
  - getSegment
```
public abstract IndexSegment getSegment()
```
  - destroy
```
public void destroy()
```
    Destroys the data manager and releases all the resources allocated. The data manager can only be destroyed once.
  - doDestroy
```
protected abstract void doDestroy()
```