WriterRunnable

java.lang.Object
- org.epics.archiverappliance.engine.writer.WriterRunnable

All Implemented Interfaces:

Runnable
```
public class WriterRunnable
extends Object
implements Runnable
```
WriterRunnable is scheduled by the executor in the engine context every writing period.

Author:

Luofeng Li

Constructor Summary

Constructors
Constructor Description

WriterRunnable(ConfigService configservice)
the constructor

Method Summary

Modifier and Type	Method	Description
`void`	`addChannel(ArchiveChannel channel)`	Add a channel's buffer that this thread reads
`void`	`flushBuffer()`	flush out the sample buffer to the short term storage before shutting down the engine
`void`	`removeChannel(String channelName)`	remove one sample buffer from the buffer hash map.
`void`	`run()`
`double`	`setWritingPeriod(double write_period)`	set the writing period.

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

- Constructor Detail
  - WriterRunnable
```
public WriterRunnable(ConfigService configservice)
```
    the constructor
    
    Parameters:
    
    configservice - the configservice used by this WriterRunnable
- Method Detail
  - addChannel
```
public void addChannel(ArchiveChannel channel)
```
    Add a channel's buffer that this thread reads
    
    Parameters:
    
    channel - ArchiveChannel
  - removeChannel
```
public void removeChannel(String channelName)
```
    remove one sample buffer from the buffer hash map. At the same time. it also removes the channel from the channel hash map in the engine context
    
    Parameters:
    
    channelName - the name of the channel who and whose sample buffer are removed
  - setWritingPeriod
```
public double setWritingPeriod(double write_period)
```
    set the writing period. when the writing period is at least 10 seonds. When write_period < 10 , the writing period is 10 seconds actually.
    
    Parameters:
    
    write_period - the writing period in second
    
    Returns:
    
    the actual writing period in second
  - run
```
public void run()
```
    Specified by:
    
    run in interface Runnable
  - flushBuffer
```
public void flushBuffer()
                 throws Exception
```
    flush out the sample buffer to the short term storage before shutting down the engine
    
    Throws:
    
    Exception - error occurs during writing the sample buffer to the short term storage