class OIDTDCacheable extends TDCacheable
Modifier and Type | Field and Description |
---|---|
private UUID |
identity |
dd, td
Constructor and Description |
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OIDTDCacheable(DataDictionaryImpl dd) |
Modifier and Type | Method and Description |
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void |
clearIdentity()
Put the object into the No Identity state.
|
Cacheable |
createIdentity(java.lang.Object key,
java.lang.Object createParameter)
Create a new item.
|
java.lang.Object |
getIdentity()
Get the identity of this object.
|
Cacheable |
setIdentity(java.lang.Object key)
Set the identity of the object.
|
checkConsistency, clean, getTableDescriptor, isDirty
private UUID identity
OIDTDCacheable(DataDictionaryImpl dd)
public void clearIdentity()
Cacheable
Cacheable.clearIdentity()
public java.lang.Object getIdentity()
Cacheable
Cacheable.getIdentity()
public Cacheable createIdentity(java.lang.Object key, java.lang.Object createParameter)
Cacheable
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.
Cacheable.createIdentity(java.lang.Object, java.lang.Object)
public Cacheable setIdentity(java.lang.Object key) throws StandardException
Cacheable
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.
StandardException
- Thrown on errorCacheable.setIdentity(java.lang.Object)
Apache Derby V10.13 Internals - Copyright © 2004,2016 The Apache Software Foundation. All Rights Reserved.