org.aksw.limes.core.execution.engine.partialrecallengine

Class PartialRecallExecutionEngine

java.lang.Object

org.aksw.limes.core.execution.engine.ExecutionEngine

org.aksw.limes.core.execution.engine.SimpleExecutionEngine

org.aksw.limes.core.execution.engine.partialrecallengine.PartialRecallExecutionEngine

All Implemented Interfaces:

IExecutionEngine

public class PartialRecallExecutionEngine
extends SimpleExecutionEngine

Implements the partial recall execution engine class. The idea is that the engine gets as input a link specification and a planner type, finds a subsumed link specification that achieves the lowest expected run time while achieving at least a predefined excepted recall. Then the partial recall execution engine executes the independent parts of the plan returned from the planner sequentially and returns a mapping.

Version:

1.0

Author:

Kleanthi Georgala (georgala@informatik.uni-leipzig.de)

Field Summary

Fields inherited from class org.aksw.limes.core.execution.engine.ExecutionEngine

buffer, expectedSelectivity, optimizationTime, source, sourceVariable, target, targetVariable

Constructor Summary

Constructors

Constructor and Description
PartialRecallExecutionEngine(ACache source, ACache target, String sourceVar, String targetVar, long maxOpt, double k) Constructor for the partial recall execution engine.

Method Summary

Modifier and Type	Method and Description
AMapping	execute(LinkSpecification spec, IPlanner planner) Executes a link specification.

Methods inherited from class org.aksw.limes.core.execution.engine.SimpleExecutionEngine

executeDifference, executeDynamic, executeFilter, executeInstructions, executeIntersection, executeRun, executeStatic, executeUnion

Methods inherited from class org.aksw.limes.core.execution.engine.ExecutionEngine

getBuffer, setBuffer

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialRecallExecutionEngine

public PartialRecallExecutionEngine(ACache source,
                                    ACache target,
                                    String sourceVar,
                                    String targetVar,
                                    long maxOpt,
                                    double k)

Constructor for the partial recall execution engine.

Parameters:

source - Source cache

target - Target cache

sourceVar - Source variable

targetVar - Target variable

maxOpt, - optimization time constraint

k, - expected selectivity

Method Detail

execute

public AMapping execute(LinkSpecification spec,
                        IPlanner planner)

Description copied from class: SimpleExecutionEngine

Executes a link specification. The execution engine chooses which execute function is going to be invoked given the planner. For the Canonical and Helios planner, the execution of link specifications has been modeled as a linear process wherein a LS is potentially first rewritten, planned and finally executed. Subsequently, the plan never changes and is simply executed. For the Dynamic planner, we enable a flow of information from the execution engine back to the planner, that uses intermediary execution results to improve plans generated previously.

Specified by:

execute in interface IExecutionEngine

Overrides:

execute in class SimpleExecutionEngine

Parameters:

spec - The link specification, after it was re-written

planner - The chosen planner

Returns:

The mapping obtained from executing the plan of the input link specification