Package org.epics.archiverappliance

Interface Writer

All Known Subinterfaces:

ETLDest, StoragePlugin

All Known Implementing Classes:

BlackholeStoragePlugin, ChannelArchiverReadOnlyPlugin, MergeDedupStoragePlugin, PBOverHTTPStoragePlugin, PlainStoragePlugin

public interface Writer

The main data consumption interface, this represents objects which take an event stream and write it to a (potentially permanent) store.

Author:

mshankar

Method Summary

Modifier and Type	Method	Description
int	appendData(BasicContext context, String pvName, EventStream stream)
Event	getLastKnownEvent(BasicContext context, String pvName)	Gets the last known event in this destination.

Method Details

appendData

int appendData(BasicContext context,
 String pvName,
 EventStream stream)
        throws IOException

Throws:

IOException

getLastKnownEvent

Event getLastKnownEvent(BasicContext context,
 String pvName)
                 throws IOException

Gets the last known event in this destination. Future events will be appended to this destination only if their timestamp is more recent than the timestamp of this event. If there is no last known event, then a null is returned.

Parameters:

context -  

pvName - The PV name

Returns:

Event The last known event of pvName

Throws:

IOException -