Package org.epics.archiverappliance.retrieval

Class DataSourceResolution

java.lang.Object

org.epics.archiverappliance.retrieval.DataSourceResolution

public class DataSourceResolution
extends Object

Author:

mshankar Class for resolving data sources

Constructor Summary

Constructors

Constructor	Description
DataSourceResolution(ConfigService configService)

Method Summary

Modifier and Type	Method	Description
LinkedList<UnitOfRetrieval>	resolveDataSources(String pvName, Instant start, Instant end, PVTypeInfo typeInfo, BasicContext context, PostProcessor postProcessor, javax.servlet.http.HttpServletRequest req, ApplianceInfo applianceForPV)	Returns a list of units of retrieval.

Methods inherited from class java.lang.Object

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

Constructor Details

DataSourceResolution

public DataSourceResolution(ConfigService configService)

Method Details

resolveDataSources

public LinkedList<UnitOfRetrieval> resolveDataSources(String pvName,
 Instant start,
 Instant end,
 PVTypeInfo typeInfo,
 BasicContext context,
 PostProcessor postProcessor,
 javax.servlet.http.HttpServletRequest req,
 ApplianceInfo applianceForPV)
                                               throws IOException

Returns a list of units of retrieval. I.e., the storage plugin description, the storage plugin object used to retrieve data, the type information for the PV, the PV name, the start and end timestamp, the postprocessor that should be used and the context in which the data should be retrieved

If the PV name that was specified in the method call is not to be found in the current appliance, the storage plugin object stored in the UnitOfRetrieval object will be a PBOverHTTPStoragePlugin object.

Parameters:

pvName - The name of PV.

start - Instant

end - Instant

typeInfo - PVTypeInf

context - BasicContext

postProcessor - PostProcessor

req - HttpServletRequest

applianceForPV - ApplianceInfo

Returns:

UnitOfRetrieval

Throws:

IOException -   A LinkedList of UnitOfRetrieval objects that contain the storage plguin description, the storage plugin object used to retrieve data, the type information of the PV, the PV name, the start and end timestamp, the postprocessor that should be used and the context in which data should be retrieved.

IOException - Thrown if there is a syntax error in the URI.