Apache Derby Database Engine and Embedded JDBC Driver 10.17.1.0 · org.apache.derby.impl.sql.catalog.OIDTDCacheable

Modifier and Type	Field and Description
private UUID	identity

Access	Constructor and Description
pack-priv	OIDTDCacheable(DataDictionaryImpl dd)

Modifier and Type	Method and Description
public void	clearIdentity() Implements org.apache.derby.iapi.services.cache.Cacheable.clearIdentity. Put the object into the No Identity state.
public Cacheable	createIdentity(Object The handle on the cacheable key, Object Creation details createParameter) Implements org.apache.derby.iapi.services.cache.Cacheable.createIdentity. Create a new item.
public Object	getIdentity() Implements org.apache.derby.iapi.services.cache.Cacheable.getIdentity. Get the identity of this object.
public Cacheable	setIdentity(Object The handle on the cacheable key) Implements org.apache.derby.iapi.services.cache.Cacheable.setIdentity. Set the identity of the object.

identity	back to summary
private UUID identity

OIDTDCacheable	back to summary
pack-priv OIDTDCacheable(DataDictionaryImpl dd)

Method Detail

clearIdentity back to summary

clearIdentity	back to summary
public void clearIdentity() Implements org.apache.derby.iapi.services.cache.Cacheable.clearIdentity. Doc from org.apache.derby.iapi.services.cache.Cacheable.clearIdentity. 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`

public void clearIdentity()

Implements org.apache.derby.iapi.services.cache.Cacheable.clearIdentity.

Doc from org.apache.derby.iapi.services.cache.Cacheable.clearIdentity.

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

createIdentity back to summary

createIdentity	back to summary
public Cacheable createIdentity(Object key, Object createParameter) Implements org.apache.derby.iapi.services.cache.Cacheable.createIdentity. Doc from org.apache.derby.iapi.services.cache.Cacheable.createIdentity. 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. Parameters key:Object The handle on the cacheable createParameter:Object Creation details Returns:Cacheable an object reference if the object can take on the identity, null otherwise. See Also `Cacheable#createIdentity`

public Cacheable createIdentity(Object key, Object createParameter)

Implements org.apache.derby.iapi.services.cache.Cacheable.createIdentity.

Doc from org.apache.derby.iapi.services.cache.Cacheable.createIdentity.

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.

Parameters

key:Object: The handle on the cacheable
createParameter:Object: Creation details

Returns:Cacheable

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

See Also

Cacheable#createIdentity

getIdentity back to summary

getIdentity	back to summary
public Object getIdentity() Implements org.apache.derby.iapi.services.cache.Cacheable.getIdentity. Doc from org.apache.derby.iapi.services.cache.Cacheable.getIdentity. Get the identity of this object. MT - thread safe. Returns:Object the object identity See Also `Cacheable#getIdentity`

public Object getIdentity()

Implements org.apache.derby.iapi.services.cache.Cacheable.getIdentity.

Doc from org.apache.derby.iapi.services.cache.Cacheable.getIdentity.

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

Returns:Object: the object identity
See Also: Cacheable#getIdentity

setIdentity back to summary

setIdentity	back to summary
public Cacheable setIdentity(Object key) throws StandardException Implements org.apache.derby.iapi.services.cache.Cacheable.setIdentity. Doc from org.apache.derby.iapi.services.cache.Cacheable.setIdentity. 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. Parameters key:Object The handle on the cacheable Returns:Cacheable an object reference if the object can take on the identity, null otherwise. Exceptions StandardException: Thrown on error See Also `Cacheable#setIdentity`

public Cacheable setIdentity(Object key) throws StandardException

Implements org.apache.derby.iapi.services.cache.Cacheable.setIdentity.

Doc from org.apache.derby.iapi.services.cache.Cacheable.setIdentity.

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.

Parameters

key:Object: The handle on the cacheable

Returns:Cacheable

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

Exceptions

StandardException:: Thrown on error

See Also

Cacheable#setIdentity

pack-priv Class OIDTDCacheable

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