Package org.epics.archiverappliance.engine.model

Class SampleBuffer

java.lang.Object

org.epics.archiverappliance.engine.model.SampleBuffer

public class SampleBuffer
extends Object

Buffer for the samples of one channel.

Assumes that one thread adds samples, while a different thread removes them. When the queue size is reached, older samples get dropped.

Version:

Initial version:CSS, 4-Jun-2012, Luofeng Li:added codes to support for the new archiver

Author:

Kay Kasemir

Constructor Summary

Constructors

Constructor	Description
SampleBuffer(String channel_name, int capacity, ArchDBRTypes archdbrtype, PVMetrics pVMetrics)	Create sample buffer of given capacity

Method Summary

Modifier and Type	Method	Description
boolean	add(DBRTimeEvent value)	Add a sample to the queue, maybe dropping older samples
void	addYearListener(YearListener yearListener)	add the year listener to this buffer
int	getCapacity()
String	getChannelName()
ArrayListEventStream	getCombinedSamples()	get the combined ArrayListEventStream of the previous and the current
ArrayListEventStream	getCurrentSamples()	get current ArrayListEventStream
ArrayListEventStream	getPreviousSamples()	get the previous ArrayListEventStream
int	getQueueSize()
boolean	hasCurrentSamples()
static boolean	isInErrorState()
void	resetSamples()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

SampleBuffer

public SampleBuffer(String channel_name,
 int capacity,
 ArchDBRTypes archdbrtype,
 PVMetrics pVMetrics)

Create sample buffer of given capacity

Parameters:

channel_name -  

capacity -  

archdbrtype - ArchDBRTypes

pVMetrics - PVMetrics

Method Details

getChannelName

public String getChannelName()

Returns:

channel name of this buffer

getCurrentSamples

public ArrayListEventStream getCurrentSamples()

get current ArrayListEventStream

Returns:

ArrayListEventStream

getCombinedSamples

public ArrayListEventStream getCombinedSamples()

get the combined ArrayListEventStream of the previous and the current

Returns:

ArrayListEventStream

resetSamples

public void resetSamples()

getPreviousSamples

public ArrayListEventStream getPreviousSamples()

get the previous ArrayListEventStream

Returns:

ArrayListEventStream

getCapacity

public int getCapacity()

Returns:

Queue capacity, i.e. maximum queue size.

getQueueSize

public int getQueueSize()

Returns:

Current queue size, i.e. number of samples in the queue.

hasCurrentSamples

public boolean hasCurrentSamples()

Returns:

true if there are samples currently waiting in the active buffer.

isInErrorState

public static boolean isInErrorState()

Returns:

true if currently experiencing write errors

add

public boolean add(DBRTimeEvent value)

Add a sample to the queue, maybe dropping older samples

Parameters:

value - DBRTimeEvent

Returns:

boolean true if we need to increment the event count.

toString

public String toString()

Overrides:

toString in class Object

addYearListener

public void addYearListener(YearListener yearListener)

add the year listener to this buffer

Parameters:

yearListener - the interface of yearListener