com.bigdata.bop

Interface IQueryContext

All Known Subinterfaces:

IRunningQuery

All Known Implementing Classes:

AbstractRunningQuery, ChunkedRunningQuery, FederatedRunningQuery, MockQueryContext, MockRunningQuery

public interface IQueryContext

Context for the evaluation of a query pipeline.

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
IQueryAttributes	getAttributes() Return an interface which allows attribute values to be associated with an IQueryContext.
IMemoryManager	getMemoryManager() Return the IMemoryManager which may be used to buffer data on high level data structures, such as the HTree, for this query.
UUID	getQueryId() The unique identifier for the query.

Method Detail

getQueryId

UUID getQueryId()

The unique identifier for the query.

getMemoryManager

IMemoryManager getMemoryManager()

Return the IMemoryManager which may be used to buffer data on high level data structures, such as the HTree, for this query. Each operator in the query should in general create its own child IMemoryManager. While the overall IMemoryManager context associated with a query will be released when the query terminates, operators which create child IMemoryManager contexts are responsible for releasing their IMemoryManager in a timely fashion when the operator has finished its evaluation.

getAttributes

IQueryAttributes getAttributes()

Return an interface which allows attribute values to be associated with an IQueryContext.