Module org.evrete.core

Package org.evrete

Class KnowledgeService

java.lang.Object

org.evrete.KnowledgeService

public class KnowledgeService
extends Object

KnowledgeService is a root element of every Evrete-based application. It holds the initial Configuration, security settings, references to all required SPI implementations, and an instance of the Java ExecutorService.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	KnowledgeService.Builder	The Builder class is responsible for constructing instances of the KnowledgeService class.

Constructor Summary

Constructors

Constructor	Description
KnowledgeService()
KnowledgeService(Configuration conf)

Method Summary

Modifier and Type	Method	Description
static KnowledgeService.Builder	builder()
static KnowledgeService.Builder	builder(Configuration configuration)
ClassLoader	getClassLoader()
Configuration	getConfiguration()
DSLKnowledgeProvider	getDSL(Class<? extends DSLKnowledgeProvider> dsl)	A convenience method to load specific DSL implementation;
DSLKnowledgeProvider	getDSL(String dsl)	A convenience method to load specific DSL implementation;
ForkJoinExecutor	getExecutor()
ExpressionResolverProvider	getExpressionResolverProvider()
LiteralSourceCompiler	getLiteralSourceCompiler()
MemoryFactoryProvider	getMemoryFactoryProvider()
TypeResolverProvider	getTypeResolverProvider()
Knowledge	newKnowledge()
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, File... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, InputStream... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, Reader... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, Class<?>... resources)	This is a convenience method.
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, String... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, URL... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, TypeResolver resolver, File... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, TypeResolver typeResolver, InputStream... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, TypeResolver typeResolver, Reader... resources)
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, TypeResolver typeResolver, Class<?>... resources)	This is a convenience method.
Knowledge	newKnowledge(Class<? extends DSLKnowledgeProvider> dsl, TypeResolver typeResolver, URL... resources)
Knowledge	newKnowledge(String dsl, File... resources)
Knowledge	newKnowledge(String dsl, InputStream... resources)
Knowledge	newKnowledge(String dsl, Reader... resources)
Knowledge	newKnowledge(String dsl, Class<?>... resources)	This is a convenience method.
Knowledge	newKnowledge(String dsl, String... resources)
Knowledge	newKnowledge(String dsl, URL... resources)
Knowledge	newKnowledge(String dsl, TypeResolver resolver, File... resources)
Knowledge	newKnowledge(String dsl, TypeResolver typeResolver, InputStream... resources)
Knowledge	newKnowledge(String dsl, TypeResolver typeResolver, Reader... resources)
Knowledge	newKnowledge(String dsl, TypeResolver typeResolver, Class<?>... resources)	This is a convenience method.
Knowledge	newKnowledge(String dsl, TypeResolver typeResolver, URL... resources)
Knowledge	newKnowledge(TypeResolver typeResolver)
StatefulSession	newStatefulSession()	This method is a shorthand for newKnowledge().newStatefulSession() which returns an empty session instance.
StatelessSession	newStatelessSession()	This method is a shorthand for newKnowledge().newStatelessSession() which returns an empty session instance.
TypeResolver	newTypeResolver()
void	setClassLoader(ClassLoader classLoader)
void	shutdown()	Shuts down the service and releases its internal resources.

Methods inherited from class java.lang.Object

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

Constructor Details

KnowledgeService

public KnowledgeService(Configuration conf)

KnowledgeService

public KnowledgeService()

Method Details

builder

public static KnowledgeService.Builder builder()

builder

public static KnowledgeService.Builder builder(Configuration configuration)

getClassLoader

public ClassLoader getClassLoader()

setClassLoader

public void setClassLoader(ClassLoader classLoader)

newKnowledge

public Knowledge newKnowledge()

Returns:

an empty Knowledge instance

newKnowledge

public Knowledge newKnowledge(TypeResolver typeResolver)

Parameters:

typeResolver - the type resolver to use in the newly created Knowledge instance

Returns:

an empty Knowledge instance

newTypeResolver

public TypeResolver newTypeResolver()

getDSL

public DSLKnowledgeProvider getDSL(String dsl)

A convenience method to load specific DSL implementation;

Parameters:

dsl - DSL name

Returns:

new instance of DSL provider

Throws:

IllegalStateException - if no implementation found by the given name

getDSL

public DSLKnowledgeProvider getDSL(Class<? extends DSLKnowledgeProvider> dsl)

A convenience method to load specific DSL implementation;

Parameters:

dsl - DSL implementation class

Returns:

new instance of DSL provider

Throws:

IllegalStateException - if implementation could not be instantiated

newKnowledge

public Knowledge newKnowledge(String dsl,
 URL... resources)
                       throws IOException

Parameters:

dsl - DSL name

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 URL... resources)
                       throws IOException

Parameters:

dsl - DSL class

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 File... resources)
                       throws IOException

Parameters:

dsl - DSL name

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 File... resources)
                       throws IOException

Parameters:

dsl - DSL class

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 TypeResolver resolver,
 File... resources)
                       throws IOException

Parameters:

dsl - DSL class

resolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 TypeResolver resolver,
 File... resources)
                       throws IOException

Parameters:

dsl - DSL class

resolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 TypeResolver typeResolver,
 URL... resources)
                       throws IOException

Parameters:

dsl - DSL name

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 TypeResolver typeResolver,
 URL... resources)
                       throws IOException

Parameters:

dsl - DSL class

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 Reader... resources)
                       throws IOException

Parameters:

dsl - DSL name

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 Reader... resources)
                       throws IOException

Parameters:

dsl - DSL class

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 TypeResolver typeResolver,
 Reader... resources)
                       throws IOException

Parameters:

dsl - DSL name

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 TypeResolver typeResolver,
 Reader... resources)
                       throws IOException

Parameters:

dsl - DSL class

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 InputStream... resources)
                       throws IOException

Parameters:

dsl - DSL name

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 InputStream... resources)
                       throws IOException

Parameters:

dsl - DSL class

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 TypeResolver typeResolver,
 InputStream... resources)
                       throws IOException

Parameters:

dsl - DSL name

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 TypeResolver typeResolver,
 InputStream... resources)
                       throws IOException

Parameters:

dsl - DSL class

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the data sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 Class<?>... resources)
                       throws IOException

This is a convenience method. The implementation gets URLs of each class and calls newKnowledge(String, URL...)

Parameters:

dsl - DSL name

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the class sources.

shutdown

public void shutdown()

Shuts down the service and releases its internal resources. Once a service is shutdown, it can not be reused in the future.

getExecutor

public ForkJoinExecutor getExecutor()

getConfiguration

public Configuration getConfiguration()

getMemoryFactoryProvider

public MemoryFactoryProvider getMemoryFactoryProvider()

getExpressionResolverProvider

public ExpressionResolverProvider getExpressionResolverProvider()

getLiteralSourceCompiler

public LiteralSourceCompiler getLiteralSourceCompiler()

getTypeResolverProvider

public TypeResolverProvider getTypeResolverProvider()

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 Class<?>... resources)
                       throws IOException

This is a convenience method. The implementation gets URLs of each class and calls newKnowledge(String, URL...)

Parameters:

dsl - DSL class

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the class sources.

newKnowledge

public Knowledge newKnowledge(String dsl,
 TypeResolver typeResolver,
 Class<?>... resources)
                       throws IOException

This is a convenience method. The implementation gets URLs of each class and calls newKnowledge(String, TypeResolver, URL...)

Parameters:

dsl - DSL name

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the class sources.

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 TypeResolver typeResolver,
 Class<?>... resources)
                       throws IOException

This is a convenience method. The implementation gets URLs of each class and calls newKnowledge(String, TypeResolver, URL...)

Parameters:

dsl - DSL class

typeResolver - TypeResolver to use

resources - DSL resources

Returns:

a Knowledge instance built by DSL provider from given resources.

Throws:

IOException - if an error occurs when reading the sources.

newStatefulSession

public StatefulSession newStatefulSession()

This method is a shorthand for newKnowledge().newStatefulSession() which returns an empty session instance.

Returns:

an empty StatefulSession

newStatelessSession

public StatelessSession newStatelessSession()

This method is a shorthand for newKnowledge().newStatelessSession() which returns an empty session instance.

Returns:

an empty StatelessSession

newKnowledge

public Knowledge newKnowledge(String dsl,
 String... resources)
                       throws IOException

Throws:

IOException

newKnowledge

public Knowledge newKnowledge(Class<? extends DSLKnowledgeProvider> dsl,
 String... resources)
                       throws IOException

Throws:

IOException