java.lang.Object
- org.gcube.informationsystem.types.knowledge.TypesKnowledge

```
public class TypesKnowledge
extends Object
```
Manages the knowledge about types.

Author:

Luca Frosini (ISTI - CNR)

Field Summary

Fields
Modifier and Type	Field	Description
`protected Calendar`	`creationTime`	The creation time.
`static long`	`DEFAULT_EXPIRING_TIMEOUT`	The default expiring timeout.
`protected Calendar`	`expiringTime`	The expiring time.
`int`	`expiringTimeout`	The expiring timeout.
`protected boolean`	`initialized`	A flag indicating whether the knowledge has been initialized.
`protected ModelKnowledge<Type,SchemaTypeInformation>`	`modelKnowledge`	The model knowledge.
`protected TypesDiscoverer<Type>`	`typesDiscoverer`	The types discoverer.

Constructor Summary

Constructors
Constructor Description

TypesKnowledge()
Constructs a new TypesKnowledge.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`addTypeIfInitialized(Type type)`	Adds a Type to the current model knowledge only when that knowledge has already been initialized.
`void`	`discover()`	This method does nothing if TypesDiscoverer was not set.
`static TypesKnowledge`	`getInstance()`	Returns the singleton instance of this class.
`ModelKnowledge<Type,SchemaTypeInformation>`	`getModelKnowledge()`	Returns the model knowledge.
`TypesDiscoverer<Type>`	`getTypesDiscoverer()`	Returns the types discoverer.
`protected void`	`init(boolean forceReinitialization)`	Initializes the knowledge.
`void`	`invalidate()`	Invalidates the current knowledge without triggering discovery.
`void`	`renew()`	Forces reinitialization of the ModelKnowledge.
`void`	`setExpiringTimeout(int expiringTimeout)`	Sets the expiring timeout.
`void`	`setTypesDiscoverer(TypesDiscoverer<Type> typesDiscoverer)`	Sets the types discoverer.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_EXPIRING_TIMEOUT
```
public static final long DEFAULT_EXPIRING_TIMEOUT
```
    The default expiring timeout.
  - initialized
```
protected volatile boolean initialized
```
    A flag indicating whether the knowledge has been initialized.
  - expiringTimeout
```
public int expiringTimeout
```
    The expiring timeout.
  - creationTime
```
protected Calendar creationTime
```
    The creation time.
  - expiringTime
```
protected Calendar expiringTime
```
    The expiring time.
  - modelKnowledge
```
protected ModelKnowledge<Type,SchemaTypeInformation> modelKnowledge
```
    The model knowledge.
  - typesDiscoverer
```
protected TypesDiscoverer<Type> typesDiscoverer
```
    The types discoverer.
- Constructor Detail
  - TypesKnowledge
```
public TypesKnowledge()
```
    Constructs a new TypesKnowledge.
- Method Detail
  - getInstance
```
public static TypesKnowledge getInstance()
```
    Returns the singleton instance of this class.
    
    Returns:
    
    The singleton instance.
  - setExpiringTimeout
```
public void setExpiringTimeout(int expiringTimeout)
```
    Sets the expiring timeout.
    
    Parameters:
    
    expiringTimeout - The expiring timeout in milliseconds.
  - getTypesDiscoverer
```
public TypesDiscoverer<Type> getTypesDiscoverer()
```
    Returns the types discoverer.
    
    Returns:
    
    The types discoverer.
  - setTypesDiscoverer
```
public void setTypesDiscoverer(TypesDiscoverer<Type> typesDiscoverer)
```
    Sets the types discoverer.
    
    Parameters:
    
    typesDiscoverer - The types discoverer.
  - getModelKnowledge
```
public ModelKnowledge<Type,SchemaTypeInformation> getModelKnowledge()
```
    Returns the model knowledge.
    
    Returns:
    
    The model knowledge.
  - addTypeIfInitialized
```
public boolean addTypeIfInitialized(Type type)
```
    Adds a Type to the current model knowledge only when that knowledge has already been initialized. This avoids triggering a complete discovery merely to update an otherwise unused cache after a successful remote mutation.
    
    Parameters:
    
    type - the Type to add
    
    Returns:
    
    true when the initialized knowledge was updated, false when no initialized knowledge exists yet
  - invalidate
```
public void invalidate()
```
    Invalidates the current knowledge without triggering discovery. The next access rebuilds the complete snapshot through the configured discoverer.
  - init
```
protected void init(boolean forceReinitialization)
```
    Initializes the knowledge.
    
    Parameters:
    
    forceReinitialization - A flag indicating whether to force reinitialization.
  - discover
```
public void discover()
```
    This method does nothing if TypesDiscoverer was not set. Otherwise, it initializes the ModelKnowledge if it was not already initialized. To enforce rediscovery, use the renew method.
  - renew
```
public void renew()
```
    Forces reinitialization of the ModelKnowledge.

Class TypesKnowledge

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_EXPIRING_TIMEOUT

initialized

expiringTimeout

creationTime

expiringTime

modelKnowledge

typesDiscoverer

Constructor Detail

TypesKnowledge

Method Detail

getInstance

setExpiringTimeout

getTypesDiscoverer

setTypesDiscoverer

getModelKnowledge

addTypeIfInitialized

invalidate

init

discover

renew