com.atlassian.jira.propertyset

Class CachingOfBizPropertySet

java.lang.Object

com.opensymphony.module.propertyset.AbstractPropertySet

com.atlassian.jira.propertyset.CachingOfBizPropertySet

All Implemented Interfaces:

com.opensymphony.module.propertyset.PropertySet, Serializable

public class CachingOfBizPropertySet
extends com.opensymphony.module.propertyset.AbstractPropertySet
implements Serializable

Reimplementation of OFBizPropertySet that caches property entries and values to provide more efficient access.

Note that JiraCachingPropertySet is just a decorator around an arbitrary supplied property set and thus has uncertain behaviour both in a clustered environment and when there are multiple instances of the caching property set, as the individual caches have no way to share state.

CachingOfBizPropertySet is different. It is a flyweight around the OfBizPropertyEntryStore, which caches the operations that it can (such as the existence, type, and value of an entry) and delegates those it can't cache to the database directly. The implementation deviates from that of OFBizPropertySet only in ways that make it more fault-tolerant, such as by not throwing an exception when removing a nonexistent property and not throwing an exception when setting a property to a new type without removing it first.

The only known disadvantage to using this class is that it will eagerly load the value on a cache miss. This seems to be an acceptable loss, because the main reasons why code would bother to call exists(String) or getType(String) seem to be

1. To know whether or not the property exists and/or the appropriate getter type to use, both of which suggest that the value will eventually be retrieved anyway and that loading it eagerly is not wasteful.
2. To guard against the exception that OFBizPropertySet throws if you attempt to remove a property that does not exist of change the type of an existing property. This implementation silently ignores a spurious remove and gracefully updates the type if it is changed, so these guards are not necessary.
3. To use the existence or absence of the key as a boolean value, where the actual stored value is a meaningless sentinel. This is a strange thing to do, and it makes more sense to store an actual boolean value for the property, instead.

This class is thread-safe, in spite of the difficulties that the PropertySet contract imposes upon it. Its only mutable state is the entity definition provided through PropertySet.init(Map,Map). This is stored in an immutable holder class whose reference is marked as volatile to ensure safe publishing.

Although OFBizPropertySet itself allows for multiple generic delegators to be used, this implementation ignores this setting. JIRA always uses the "default" delegator.

Since:

v6.2

See Also:

Serialized Form

Field Summary

Fields inherited from class com.opensymphony.module.propertyset.AbstractPropertySet

schema

Fields inherited from interface com.opensymphony.module.propertyset.PropertySet

BOOLEAN, DATA, DATE, DOUBLE, INT, LONG, OBJECT, PROPERTIES, STRING, TEXT, XML

Constructor Summary

Constructors

Constructor and Description
CachingOfBizPropertySet()
CachingOfBizPropertySet(String entityName, Long entityId)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
boolean	exists(String key)
protected Object	get(int type, String key)
List<String>	getKeys()
List<String>	getKeys(int type)
List<String>	getKeys(String prefix)
List<String>	getKeys(String prefix, int type)
int	getType(String key)
int	hashCode()
void	init(Map config, Map args)
void	remove()
void	remove(String key) Implementation note: Unlike OFBizPropertySet, this implementation will not throw an exception if the property does not exist.
protected void	setImpl(int type, String key, Object obj)
boolean	supportsType(int type)

Methods inherited from class com.opensymphony.module.propertyset.AbstractPropertySet

getAsActualType, getBoolean, getData, getDate, getDouble, getInt, getLong, getObject, getProperties, getSchema, getString, getText, getXML, isSettable, setAsActualType, setBoolean, setData, setDate, setDouble, setInt, setLong, setObject, setProperties, setSchema, setString, setText, setXML, supportsTypes, toString, type, type

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CachingOfBizPropertySet

public CachingOfBizPropertySet()

CachingOfBizPropertySet

public CachingOfBizPropertySet(String entityName,
                       Long entityId)

Method Detail

getKeys

public List<String> getKeys()

Specified by:

getKeys in interface com.opensymphony.module.propertyset.PropertySet

Overrides:

getKeys in class com.opensymphony.module.propertyset.AbstractPropertySet

getKeys

public List<String> getKeys(String prefix)

Specified by:

getKeys in interface com.opensymphony.module.propertyset.PropertySet

Overrides:

getKeys in class com.opensymphony.module.propertyset.AbstractPropertySet

getKeys

public List<String> getKeys(int type)

Specified by:

getKeys in interface com.opensymphony.module.propertyset.PropertySet

Overrides:

getKeys in class com.opensymphony.module.propertyset.AbstractPropertySet

getKeys

public List<String> getKeys(String prefix,
                   int type)

Specified by:

getKeys in interface com.opensymphony.module.propertyset.PropertySet

getType

public int getType(String key)
            throws com.opensymphony.module.propertyset.PropertyException

Specified by:

getType in interface com.opensymphony.module.propertyset.PropertySet

Throws:

com.opensymphony.module.propertyset.PropertyException

exists

public boolean exists(String key)
               throws com.opensymphony.module.propertyset.PropertyException

Specified by:

exists in interface com.opensymphony.module.propertyset.PropertySet

Throws:

com.opensymphony.module.propertyset.PropertyException

init

public void init(Map config,
        Map args)

Specified by:

init in interface com.opensymphony.module.propertyset.PropertySet

Overrides:

init in class com.opensymphony.module.propertyset.AbstractPropertySet

remove

public void remove()
            throws com.opensymphony.module.propertyset.PropertyException

Specified by:

remove in interface com.opensymphony.module.propertyset.PropertySet

Throws:

com.opensymphony.module.propertyset.PropertyException

remove

public void remove(String key)

Implementation note: Unlike OFBizPropertySet, this implementation will not throw an exception if the property does not exist.

Specified by:

remove in interface com.opensymphony.module.propertyset.PropertySet

Parameters:

key - the key of the property to be removed

Throws:

com.opensymphony.module.propertyset.PropertyException - if the attempt to remove an existing property fails at the persistence layer

supportsType

public boolean supportsType(int type)

Specified by:

supportsType in interface com.opensymphony.module.propertyset.PropertySet

Overrides:

supportsType in class com.opensymphony.module.propertyset.AbstractPropertySet

setImpl

protected void setImpl(int type,
           String key,
           Object obj)

Specified by:

setImpl in class com.opensymphony.module.propertyset.AbstractPropertySet

get

@Nullable
protected Object get(int type,
                  String key)

Specified by:

get in class com.opensymphony.module.propertyset.AbstractPropertySet

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object