Package org.epics.archiverappliance.retrieval.postprocessors

Class OptimizedWithLastSample

java.lang.Object
org.epics.archiverappliance.retrieval.postprocessors.OptimizedWithLastSample
All Implemented Interfaces:
FillNoFillSupport, PostProcessor, PostProcessorWithConsolidatedEventStream
public class OptimizedWithLastSample extends Object implements PostProcessor, PostProcessorWithConsolidatedEventStream, FillNoFillSupport
OptimizedWithLastSample expects one parameter at initialization, which is the number of requested points. If there are less samples in the time interval than requested (with a certain deadband), all samples will be returned. If there are more samples than requested, the samples will be collected into bins. Mean, std, min, max and count of each bin is calculated and returned as a single sample. This differs from the Optimized post processor in that if a bin is empty, instead of repeating the last bin with samples, the bin uses the last value of the last recorded sample instead (as mean, min and max; stddev is zero and number of samples is also zero).

  • Field Details

    • consolidatedData

      protected LinkedHashMap<Long,org.epics.archiverappliance.retrieval.postprocessors.SummaryStatsPostProcessor.SummaryValue> consolidatedData

  • Constructor Details

    • OptimizedWithLastSample

      public OptimizedWithLastSample()

  • Method Details

    • 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 interface PostProcessor
      Parameters:
      userarg - This is the full form (extension) of the identity for the post processor.
      pvName - The name of PV
      Throws:
      IOException -  

    • estimateMemoryConsumption

      public long estimateMemoryConsumption(String pvName, PVTypeInfo typeInfo, Instant start, Instant 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 interface PostProcessor
      Parameters:
      pvName - The name of PV
      typeInfo - PVTypeInfo
      start - Instant
      end - Instant
      req - HttpServletRequest
      Returns:
      Estimated Memory comsumption

    • doNotInheritValuesFromPrevioisBins

      public void doNotInheritValuesFromPrevioisBins()
      Specified by:
      doNotInheritValuesFromPrevioisBins in interface FillNoFillSupport

    • zeroOutEmptyBins

      public boolean zeroOutEmptyBins()
      Description copied from interface: FillNoFillSupport
      For some post processors, we do fill empty bins but with zeroes instead.
      Specified by:
      zeroOutEmptyBins in interface FillNoFillSupport
      Returns:
      boolean True or False

    • getConsolidatedEventStream

      public EventStream getConsolidatedEventStream()
      Specified by:
      getConsolidatedEventStream in interface PostProcessorWithConsolidatedEventStream

    • getStartBinEpochSeconds

      public long getStartBinEpochSeconds()
      Specified by:
      getStartBinEpochSeconds in interface PostProcessorWithConsolidatedEventStream

    • getEndBinEpochSeconds

      public long getEndBinEpochSeconds()
      Specified by:
      getEndBinEpochSeconds in interface PostProcessorWithConsolidatedEventStream

    • getBinTimestamps

      public LinkedList<TimeSpan> getBinTimestamps()
      Specified by:
      getBinTimestamps in interface PostProcessorWithConsolidatedEventStream

    • 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.
      1. For example, pp=firstSample_600 asks the server to sparsify with an interval of 600 seconds.
      2. identity is firstSample.
      3. extension is firstSample_600.
      4. User specifies firstSample_600.
      5. ETL caches the data as firstSample_600 if asked to.
      Specified by:
      getIdentity in interface PostProcessor
      Returns:
      identify  

    • 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 interface PostProcessor
      Returns:
      extension  
      See Also:

    • 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 interface PostProcessor
      Parameters:
      callable -  
      Returns:
      EventStream  

    • customStatsWrap

      public Callable<EventStream> customStatsWrap(Callable<EventStream> callable)