org.apache.nifi.atlas.provenance

Class NiFiProvenanceEventAnalyzerFactory.AnalyzerHolder

java.lang.Object

org.apache.nifi.atlas.provenance.NiFiProvenanceEventAnalyzerFactory.AnalyzerHolder

Enclosing class:

NiFiProvenanceEventAnalyzerFactory

private static class NiFiProvenanceEventAnalyzerFactory.AnalyzerHolder
extends Object

This holder class is used to implement initialization-on-demand holder idiom to avoid double-checked locking anti-pattern. The static initializer is performed only once for a class loader. See these links for detail:

• Double-checked locking
• Initialization-on-demand holder

Field Summary

Fields

Modifier and Type	Field and Description
private static Map<Pattern,NiFiProvenanceEventAnalyzer>	analyzersForComponentType
private static Map<ProvenanceEventType,NiFiProvenanceEventAnalyzer>	analyzersForProvenanceEventType
private static Map<Pattern,NiFiProvenanceEventAnalyzer>	analyzersForTransitUri
private static org.slf4j.Logger	logger

Constructor Summary

Constructors

Modifier	Constructor and Description
private	AnalyzerHolder()

Method Summary

Modifier and Type	Method and Description
private static void	addAnalyzer(String patternStr, Map<Pattern,NiFiProvenanceEventAnalyzer> toAdd, NiFiProvenanceEventAnalyzer analyzer)
private static Map<Pattern,NiFiProvenanceEventAnalyzer>	getAnalyzersForComponentType()
private static Map<ProvenanceEventType,NiFiProvenanceEventAnalyzer>	getAnalyzersForProvenanceEventType()
private static Map<Pattern,NiFiProvenanceEventAnalyzer>	getAnalyzersForTransitUri()

Methods inherited from class java.lang.Object

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

Field Detail

logger

private static final org.slf4j.Logger logger

analyzersForComponentType

private static final Map<Pattern,NiFiProvenanceEventAnalyzer> analyzersForComponentType

analyzersForTransitUri

private static final Map<Pattern,NiFiProvenanceEventAnalyzer> analyzersForTransitUri

analyzersForProvenanceEventType

private static final Map<ProvenanceEventType,NiFiProvenanceEventAnalyzer> analyzersForProvenanceEventType

Constructor Detail

AnalyzerHolder

private AnalyzerHolder()

Method Detail

addAnalyzer

private static void addAnalyzer(String patternStr,
                                Map<Pattern,NiFiProvenanceEventAnalyzer> toAdd,
                                NiFiProvenanceEventAnalyzer analyzer)

getAnalyzersForComponentType

private static Map<Pattern,NiFiProvenanceEventAnalyzer> getAnalyzersForComponentType()

getAnalyzersForTransitUri

private static Map<Pattern,NiFiProvenanceEventAnalyzer> getAnalyzersForTransitUri()

getAnalyzersForProvenanceEventType

private static Map<ProvenanceEventType,NiFiProvenanceEventAnalyzer> getAnalyzersForProvenanceEventType()