java.lang.Object
- org.apache.druid.segment.writeout.TmpFileSegmentWriteOutMedium

All Implemented Interfaces:

Closeable, AutoCloseable, SegmentWriteOutMedium
```
public final class TmpFileSegmentWriteOutMedium
extends Object
implements SegmentWriteOutMedium
```
Builds segment write out medium objects that are based on temporary files. Some analysis of usage of these objects shows that they periodically get used for very small things, where the overhead of creating a tmp file is actually very large. It would be best to go back and look at usages and try to make them lazy such that they only actually use a medium when they need it. But, in an attempt to get some benefits, we "shim" in the laziness by returning a heap-based WriteOutBytes that only falls back to making a tmp file when it actually fills up.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`Closer`	`getCloser()`	Returns a closer of this SegmentWriteOutMedium, which is closed in this SegmentWriteOutMedium's close() method.
`SegmentWriteOutMedium`	`makeChildWriteOutMedium()`	Creates a 'child' version of the `SegmentWriteOutMedium`, which can be optionally closed, independent of this `SegmentWriteOutMedium` but otherwise shares the same configuration.
`WriteOutBytes`	`makeWriteOutBytes()`	Creates a new empty `WriteOutBytes`, attached to this SegmentWriteOutMedium.

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

- Method Detail
  - makeWriteOutBytes
```
public WriteOutBytes makeWriteOutBytes()
```
    Description copied from interface: SegmentWriteOutMedium
    
    Creates a new empty WriteOutBytes, attached to this SegmentWriteOutMedium. When this SegmentWriteOutMedium is closed, the returned WriteOutBytes couldn't be used anymore.
    
    Specified by:
    
    makeWriteOutBytes in interface SegmentWriteOutMedium
  - makeChildWriteOutMedium
```
public SegmentWriteOutMedium makeChildWriteOutMedium()
                                              throws IOException
```
    Description copied from interface: SegmentWriteOutMedium
    
    Creates a 'child' version of the SegmentWriteOutMedium, which can be optionally closed, independent of this SegmentWriteOutMedium but otherwise shares the same configuration. This allows callers using a shared SegmentWriteOutMedium but which control the complete lifecycle of the WriteOutBytes which they require to free the backing resources when they are finished, rather than waiting until Closeable.close() is called for this medium.
    The 'child' medium will be closed when Closeable.close() is called, if not called explicitly prior to closing this medium.
    
    Specified by:
    
    makeChildWriteOutMedium in interface SegmentWriteOutMedium
    
    Throws:
    
    IOException
  - getCloser
```
public Closer getCloser()
```
    Description copied from interface: SegmentWriteOutMedium
    
    Returns a closer of this SegmentWriteOutMedium, which is closed in this SegmentWriteOutMedium's close() method. Could be used to "attach" some random resources to this SegmentWriteOutMedium, to be closed at the same time.
    
    Specified by:
    
    getCloser in interface SegmentWriteOutMedium
  - close
```
public void close()
           throws IOException
```
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Throws:
    
    IOException

Class TmpFileSegmentWriteOutMedium

Method Summary

Methods inherited from class java.lang.Object

Method Detail

makeWriteOutBytes

makeChildWriteOutMedium

getCloser

close