TagHistoryManager

All Known Subinterfaces:

GatewayTagHistoryManager

All Known Implementing Classes:

ProjectDefaultTagManagerFacade
```
public interface TagHistoryManager
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Results<Result>`	`browseHistoricalTags(QualifiedPath root, BrowseFilter filter)`
`java.util.List<java.lang.String>`	`getTagHistoryProviders()`	Returns the names of all of the registered tag history providers.
`void`	`queryHistory(TagHistoryQueryParams query, StreamingDatasetWriter writer)`	Queries the tag history system for the data as defined by the query parameters.
`void`	`queryHistoryDensity(StreamingDatasetWriter writer, java.util.List<? extends Path> path, java.util.Date start, java.util.Date end)`	Queries the tag store for data density information.

- Method Detail
  - getTagHistoryProviders
```
java.util.List<java.lang.String> getTagHistoryProviders()
```
    Returns the names of all of the registered tag history providers. The return list is immutable.
  - queryHistory
```
void queryHistory(TagHistoryQueryParams query,
                  StreamingDatasetWriter writer)
```
    Queries the tag history system for the data as defined by the query parameters. The results are written to the provided StreamingDatasetWriter. This allows results to be streamed and not collected in memory. However, in order to get a simple Dataset result, simply use the BasicStreamingDataset.
  - queryHistoryDensity
```
void queryHistoryDensity(StreamingDatasetWriter writer,
                         java.util.List<? extends Path> path,
                         java.util.Date start,
                         java.util.Date end)
                  throws java.lang.Exception
```
    Queries the tag store for data density information. Will return a structure with two columns: a timestamp, and the "weight", which is not really defined, but instead relative across the return set. The weight is valid until the next entry.
    
    Throws:
    
    java.lang.Exception
  - browseHistoricalTags
```
Results<Result> browseHistoricalTags(QualifiedPath root,
                                     BrowseFilter filter)
```