Package org.apache.derby.impl.sql.catalog

Class PermissionsCacheable

  • All Implemented Interfaces:
    Cacheable
    class PermissionsCacheable
extends java.lang.Object
implements Cacheable
    This class implements a Cacheable for a DataDictionary cache of permissions.

    • Method Detail

      • 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.

        Specified by:
        setIdentity in interface Cacheable
        Returns:
        an object reference if the object can take on the identity, null otherwise.
        Throws:
        StandardException - Standard Derby Policy
        See Also:
        CacheManager.find(java.lang.Object)

      • createIdentity

        public Cacheable createIdentity​(java.lang.Object key,
                                java.lang.Object createParameter)
                         throws StandardException
        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.

        Specified by:
        createIdentity in interface Cacheable
        Returns:
        an object reference if the object can take on the identity, null otherwise.
        Throws:
        StandardException - If forCreate is true and the object cannot be created.
        See Also:
        CacheManager.create(java.lang.Object, java.lang.Object)

      • 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.
        Specified by:
        clearIdentity in interface Cacheable

      • getIdentity

        public java.lang.Object getIdentity()
        Description copied from interface: Cacheable
        Get the identity of this object.
        MT - thread safe.
        Specified by:
        getIdentity in interface Cacheable

      • isDirty

        public boolean isDirty()
        Description copied from interface: 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 Cacheable

      • clean

        public void clean​(boolean forRemove)
           throws StandardException
        Description copied from interface: 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 Cacheable
        Throws:
        StandardException - Standard Derby error policy.