java.lang.Object
org.apache.derby.impl.sql.conn.CachedStatement
- All Implemented Interfaces:
- org.apache.derby.iapi.services.cache.Cacheable
- public class CachedStatement
- extends java.lang.Object
- implements org.apache.derby.iapi.services.cache.Cacheable
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ps
private org.apache.derby.impl.sql.GenericPreparedStatement ps
identity
private java.lang.Object identity
CachedStatement
public CachedStatement()
getPreparedStatement
public org.apache.derby.impl.sql.GenericPreparedStatement getPreparedStatement()
- Get the PreparedStatement that is associated with this Cacheable
clean
public void clean(boolean forRemove)
- Description copied from interface:
org.apache.derby.iapi.services.cache.Cacheable
- Clean the object.
It is up to the object to ensure synchronization of the isDirty()
and clean() method calls.
If forRemove is true then the
object is being removed due to an explict remove request, in this case
the cache manager will have called this method regardless of the
state of the isDirty()
If an exception is thrown the object must be left in the clean state.
MT - thread safe - Can be called at any time by the cache manager, it is the
responsibility of the object implementing Cacheable to ensure any users of the
object do not conflict with the clean call.
- Specified by:
clean in interface org.apache.derby.iapi.services.cache.Cacheable
setIdentity
public org.apache.derby.iapi.services.cache.Cacheable setIdentity(java.lang.Object key)
- Description copied from interface:
org.apache.derby.iapi.services.cache.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.
- Specified by:
setIdentity in interface org.apache.derby.iapi.services.cache.Cacheable
createIdentity
public org.apache.derby.iapi.services.cache.Cacheable createIdentity(java.lang.Object key,
java.lang.Object createParameter)
- Description copied from interface:
org.apache.derby.iapi.services.cache.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.
- Specified by:
createIdentity in interface org.apache.derby.iapi.services.cache.Cacheable
clearIdentity
public void clearIdentity()
- Description copied from interface:
org.apache.derby.iapi.services.cache.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.
- Specified by:
clearIdentity in interface org.apache.derby.iapi.services.cache.Cacheable
getIdentity
public java.lang.Object getIdentity()
- Description copied from interface:
org.apache.derby.iapi.services.cache.Cacheable
- Get the identity of this object.
MT - thread safe.
- Specified by:
getIdentity in interface org.apache.derby.iapi.services.cache.Cacheable
isDirty
public boolean isDirty()
- Description copied from interface:
org.apache.derby.iapi.services.cache.Cacheable
- Returns true of the object is dirty.
May be called when the object is kept or unkept.
MT - thread safe
- Specified by:
isDirty in interface org.apache.derby.iapi.services.cache.Cacheable
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