Java Doc for PropertyConglomerate.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » access » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.access 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.derby.impl.store.access.PropertyConglomerate

PropertyConglomerate
class PropertyConglomerate (Code)
Stores properties in a congolmerate with complete transactional support.

The PropertyConglomerate contains one row with 2 columns per property. Column 0 is the UTF key, and column 1 is the data.

The property conglomerate manages the storage of database properties and thier defaults. Each property is stored as a row in the PropertyConglomerate

  1. Column 0 is the UTF key,
  2. Column 1 is the data.
All the property defaults are stored in a single row of the Property Conglomerate:
  1. Column 0 is the UTF key "derby.defaultPropertyName".
  2. Column 1 is a FormatableProperties object with one row per default property.

In general a propery default defines it value if the property itself is not defined.

Because the properties conglomerate is stored in a conglomerate the information it contains is not available before the raw store runs recovery. To make a small number of properties (listed in servicePropertyList) available during early boot, this copies them to services.properties.



Field Summary
protected  longpropertiesConglomId
    
protected  PropertiesserviceProperties
    

Constructor Summary
 PropertyConglomerate(TransactionController tc, boolean create, Properties serviceProperties, PropertyFactory pf)
    

Method Summary
 PropertiesgetProperties(TransactionController tc)
     Fetch the set of properties as a Properties object.
public  voidgetProperties(TransactionController tc, Dictionary d, boolean stringsOnly, boolean defaultsOnly)
    
 SerializablegetProperty(TransactionController tc, String key)
     Gets the de-serialized object associated with a property key.

The Store provides a transaction protected list of database properties. Higher levels of the system can store and retrieve these properties once Recovery has finished.

 SerializablegetPropertyDefault(TransactionController tc, String key)
     Get the default for a property.
 voidlockProperties(TransactionController tc)
     Lock the database properties for an update.
 booleanpropertyDefaultIsVisible(TransactionController tc, String key)
    
 voidresetCache()
    
 voidsaveProperty(TransactionController tc, String key, Serializable value)
    
 voidsavePropertyDefault(TransactionController tc, String key, Serializable value)
    
 voidsetProperty(TransactionController tc, String key, Serializable value, boolean dbOnlyProperty)
     Sets the Serializable object associated with a property key.

This implementation turns the setProperty into an insert into the PropertyConglomerate conglomerate.

See the discussion of getProperty().

The value stored may be a Formatable object or a Serializable object whose class name starts with java.*.

 voidsetPropertyDefault(TransactionController tc, String key, Serializable value)
     Set the default for a property.

Field Detail
propertiesConglomId
protected long propertiesConglomId(Code)



serviceProperties
protected Properties serviceProperties(Code)




Constructor Detail
PropertyConglomerate
PropertyConglomerate(TransactionController tc, boolean create, Properties serviceProperties, PropertyFactory pf) throws StandardException(Code)




Method Detail
getProperties
Properties getProperties(TransactionController tc) throws StandardException(Code)
Fetch the set of properties as a Properties object. This means that only keys that have String values will be included.



getProperties
public void getProperties(TransactionController tc, Dictionary d, boolean stringsOnly, boolean defaultsOnly) throws StandardException(Code)



getProperty
Serializable getProperty(TransactionController tc, String key) throws StandardException(Code)
Gets the de-serialized object associated with a property key.

The Store provides a transaction protected list of database properties. Higher levels of the system can store and retrieve these properties once Recovery has finished. Each property is a serializable object and is stored/retrieved using a String key.

In this implementation a lookup is done on the PropertyConglomerate conglomerate, using a scan with "key" as the qualifier.


Parameters:
  tc - The transaction to do the Conglomerate work under.
Parameters:
  key - The "key" of the property that is being requested. object The object associated with property key. null means no such key-value pair.
exception:
  StandardException - Standard exception policy.




getPropertyDefault
Serializable getPropertyDefault(TransactionController tc, String key) throws StandardException(Code)
Get the default for a property.
exception:
  StandardException - Standard exception policy.



lockProperties
void lockProperties(TransactionController tc) throws StandardException(Code)
Lock the database properties for an update.



propertyDefaultIsVisible
boolean propertyDefaultIsVisible(TransactionController tc, String key) throws StandardException(Code)



resetCache
void resetCache()(Code)



saveProperty
void saveProperty(TransactionController tc, String key, Serializable value) throws StandardException(Code)



savePropertyDefault
void savePropertyDefault(TransactionController tc, String key, Serializable value) throws StandardException(Code)



setProperty
void setProperty(TransactionController tc, String key, Serializable value, boolean dbOnlyProperty) throws StandardException(Code)
Sets the Serializable object associated with a property key.

This implementation turns the setProperty into an insert into the PropertyConglomerate conglomerate.

See the discussion of getProperty().

The value stored may be a Formatable object or a Serializable object whose class name starts with java.*. This stops arbitary objects being stored in the database by class name, which will cause problems in obfuscated/non-obfuscated systems.
Parameters:
  tc - The transaction to do the Conglomerate work under.
Parameters:
  key - The key used to lookup this property.
Parameters:
  value - The value to be associated with this key. If null,delete the property from the properties list.
exception:
  StandardException - Standard exception policy.




setPropertyDefault
void setPropertyDefault(TransactionController tc, String key, Serializable value) throws StandardException(Code)
Set the default for a property.
exception:
  StandardException - Standard exception policy.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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