Class NameTDCacheable
- java.lang.Object
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- org.apache.derby.impl.sql.catalog.TDCacheable
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- org.apache.derby.impl.sql.catalog.NameTDCacheable
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- 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.
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Field Summary
Fields Modifier and Type Field Description private TableKey
identity
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Fields inherited from class org.apache.derby.impl.sql.catalog.TDCacheable
dd, td
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Constructor Summary
Constructors Constructor Description NameTDCacheable(DataDictionaryImpl dd)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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.-
Methods inherited from class org.apache.derby.impl.sql.catalog.TDCacheable
checkConsistency, clean, getTableDescriptor, isDirty
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Field Detail
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identity
private TableKey identity
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Constructor Detail
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NameTDCacheable
NameTDCacheable(DataDictionaryImpl dd)
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Method Detail
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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()
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getIdentity
public java.lang.Object getIdentity()
Description copied from interface:Cacheable
Get the identity of this object.
MT - thread safe.- See Also:
Cacheable.getIdentity()
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createIdentity
public Cacheable createIdentity(java.lang.Object key, java.lang.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(java.lang.Object, java.lang.Object)
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setIdentity
public Cacheable setIdentity(java.lang.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(java.lang.Object)
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