Class NameTDCacheable

java.lang.Object

org.apache.derby.impl.sql.catalog.TDCacheable

org.apache.derby.impl.sql.catalog.NameTDCacheable

All Implemented Interfaces:

Cacheable

class NameTDCacheable
extends TDCacheable

This class implements a Cacheable for a DataDictionary cache of table descriptors, with the lookup key being the name of the table. Assumes client passes in a string that includes the schema name.

Field Summary

Fields

Modifier and Type	Field	Description
private TableKey	identity

Fields inherited from class TDCacheable

dd, td

Constructor Summary

Constructors

Constructor	Description
NameTDCacheable(DataDictionaryImpl dd)

Method Summary

Modifier and Type	Method	Description
void	clearIdentity()	Put the object into the No Identity state.
Cacheable	createIdentity(Object key, Object createParameter)	Create a new item.
Object	getIdentity()	Get the identity of this object.
Cacheable	setIdentity(Object key)	Set the identity of the object.

Methods inherited from class TDCacheable

checkConsistency, clean, getTableDescriptor, isDirty

Methods inherited from class Object

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

Field Details

identity

private TableKey identity

Constructor Details

NameTDCacheable

NameTDCacheable(DataDictionaryImpl dd)

Method Details

clearIdentity

public void clearIdentity()

Description copied from interface: Cacheable

Put the object into the No Identity state.
MT - single thread required - Method must only be called be cache manager and the cache manager will guarantee only one thread can be calling it.

See Also:

• Cacheable.clearIdentity()

getIdentity

public Object getIdentity()

Description copied from interface: Cacheable

Get the identity of this object.
MT - thread safe.

See Also:

• Cacheable.getIdentity()

createIdentity

public Cacheable createIdentity(Object key,
 Object createParameter)

Description copied from interface: Cacheable

Create a new item.

Create a new item and set the identity of the object to represent it. The object will be in the No Identity state, ie. it will have just been created or clearIdentity() was just called.
The object must copy the information out of key, not just store a reference to key if the key is not immutable. After this call the expression getIdentity().equals(key) must return true.

If the class of the object needs to change (e.g. to support a different format) then the object should create a new object, call its initParameter() with the parameters the original object was called with, set its identity and return a reference to it. The cache manager will discard the reference to the old object.
If an exception is thrown the object must be left in the no-identity state.
MT - single thread required - Method must only be called be cache manager and the cache manager will guarantee only one thread can be calling it.

Returns:

an object reference if the object can take on the identity, null otherwise.

See Also:

• Cacheable.createIdentity(Object, Object)

setIdentity

public Cacheable setIdentity(Object key)
                      throws StandardException

Description copied from interface: Cacheable

Set the identity of the object.

Set the identity of the object to represent an item that already exists, e.g. an existing container. The object will be in the No Identity state, ie. it will have just been created or clearIdentity() was just called.
The object must copy the information out of key, not just store a reference to key. After this call the expression getIdentity().equals(key) must return true.
If the class of the object needs to change (e.g. to support a different format) then the object should create a new object, call its initParameter() with the parameters the original object was called with, set its identity and return a reference to it. The cache manager will discard the reference to the old object.
If an exception is thrown the object must be left in the no-identity state.
MT - single thread required - Method must only be called be cache manager and the cache manager will guarantee only one thread can be calling it.

Returns:

an object reference if the object can take on the identity, null otherwise.

Throws:

StandardException - Thrown on error

See Also:

• Cacheable.setIdentity(Object)