Class CAPlotBinning
- java.lang.Object
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- org.epics.archiverappliance.retrieval.postprocessors.CAPlotBinning
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- All Implemented Interfaces:
PostProcessor
,PostProcessorWithConsolidatedEventStream
public class CAPlotBinning extends Object implements PostProcessor, PostProcessorWithConsolidatedEventStream
Approx implementation of ChannelArchiver plotbinning for Michael Davidsaver From the doc- If there is no sample for the time span of a bin, the bin remains empty.
- If there is one sample, it is placed in the bin.
- If there are two samples, they are placed in the bin
- If there are more than two samples, the first and last one are placed in the bin. In addition, two artificial samples are created with a time stamp right between the first and last sample. One contains the minimum, the other the maximum of all raw samples who's time stamps fall into the bin. They are presented to the user in the sequence initial, minimum, maximum, final.
- Author:
- mshankar
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Constructor Summary
Constructors Constructor Description CAPlotBinning()
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Method Summary
Modifier and Type Method Description long
estimateMemoryConsumption(String pvName, PVTypeInfo typeInfo, Timestamp start, Timestamp end, javax.servlet.http.HttpServletRequest req)
Estimate the amount of memory required for the data generated by the post processors.LinkedList<TimeSpan>
getBinTimestamps()
static LinkedList<TimeSpan>
getBinTimestamps(long firstBin, long lastBin, int intervalSecs)
EventStream
getConsolidatedEventStream()
long
getEndBinEpochSeconds()
String
getExtension()
This is the full form of the identity for the post processor and includes any parameters for the post processor.String
getIdentity()
The string used by clients to identify this post processor when making retrieval requests.long
getStartBinEpochSeconds()
void
initialize(String userarg, String pvName)
Initialize this post processor for the given PV and request parameters.Callable<EventStream>
wrap(Callable<EventStream> callable)
Primary data generation method.
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Method Detail
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getIdentity
public String getIdentity()
Description copied from interface:PostProcessor
The string used by clients to identify this post processor when making retrieval requests. For example to identify the FirstSamplePP postprocessor, users would add a pp=firstSample to the request for data. The situation is a little more complex; if a post processor has parameters then it needs to combine these into a string and offer that as an extension. The identity is just the starting part of this.- For example, pp=firstSample_600 asks the server to sparsify with an interval of 600 seconds.
- identity is firstSample.
- extension is firstSample_600.
- User specifies firstSample_600.
- ETL caches the data as firstSample_600 if asked to.
- Specified by:
getIdentity
in interfacePostProcessor
- Returns:
- identify
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initialize
public void initialize(String userarg, String pvName) throws IOException
Description copied from interface:PostProcessor
Initialize this post processor for the given PV and request parameters.- Specified by:
initialize
in interfacePostProcessor
- Parameters:
userarg
- This is the full form (extension) of the identity for the post processor.pvName
- The name of PV- Throws:
IOException
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estimateMemoryConsumption
public long estimateMemoryConsumption(String pvName, PVTypeInfo typeInfo, Timestamp start, Timestamp end, javax.servlet.http.HttpServletRequest req)
Description copied from interface:PostProcessor
Estimate the amount of memory required for the data generated by the post processors.- Specified by:
estimateMemoryConsumption
in interfacePostProcessor
- Parameters:
pvName
- The name of PVtypeInfo
- PVTypeInfostart
- Timestampend
- Timestampreq
- HttpServletRequest- Returns:
- Estimated Memory comsumption
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wrap
public Callable<EventStream> wrap(Callable<EventStream> callable)
Description copied from interface:PostProcessor
Primary data generation method. Using the event stream provided, do your magic and generate processed data- Specified by:
wrap
in interfacePostProcessor
- Parameters:
callable
-- Returns:
- EventStream
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getExtension
public String getExtension()
Description copied from interface:PostProcessor
This is the full form of the identity for the post processor and includes any parameters for the post processor. The exact format and interpretation of this is left to the post processor; however the convention is to use underscores to separate the params and have them in a specific order.- Specified by:
getExtension
in interfacePostProcessor
- Returns:
- extension
- See Also:
PostProcessor.getIdentity()
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getConsolidatedEventStream
public EventStream getConsolidatedEventStream()
- Specified by:
getConsolidatedEventStream
in interfacePostProcessorWithConsolidatedEventStream
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getStartBinEpochSeconds
public long getStartBinEpochSeconds()
- Specified by:
getStartBinEpochSeconds
in interfacePostProcessorWithConsolidatedEventStream
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getEndBinEpochSeconds
public long getEndBinEpochSeconds()
- Specified by:
getEndBinEpochSeconds
in interfacePostProcessorWithConsolidatedEventStream
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getBinTimestamps
public LinkedList<TimeSpan> getBinTimestamps()
- Specified by:
getBinTimestamps
in interfacePostProcessorWithConsolidatedEventStream
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getBinTimestamps
public static LinkedList<TimeSpan> getBinTimestamps(long firstBin, long lastBin, int intervalSecs)
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