| java.lang.Object
 org.cougaar.qos.qrs.DataFormula
All known Subclasses: org.cougaar.qos.qrs.ProxyFormula, org.cougaar.qos.qrs.PollingIntegral, org.cougaar.qos.qrs.Aggregator, org.cougaar.core.qos.rss.DecayingHistoryFormula,
| DataFormula | | abstract public class DataFormula implements DataValueChangedCallbackListener,Constants(Code) | | A DataFormula describes a (possibly computed) attribute of a ResourceContext.
DataFormulas are gotten from the corresponding context, by name. In general
the name will be a toplevel static inner class of the context (which implies
only one formula per type).
|
| Inner Class :public static class Values extends HashMap | |
| Method Summary | |
| public DataValue | blockingQuery()
Computes and returns a new value. | | protected DataValue | computeValue(boolean forwardChain)
| | void | contextDeleted()
| | public void | dataValueChanged(DataFormula changedFormula)
Implements the DataValueChangedCallbackListener. | | abstract protected DataValue | doCalculation(Values values)
Instantiable subclasses provide this to do the formula's work, if there's
any to do. | | public void | formulaDeleted(DataFormula formula)
| | public String[] | getArgs()
| | protected DataValue | getCachedValue()
| | protected ResourceContext | getContext()
| | public List<DataFormula> | getDependencies()
Returns a list of other formulas on which this one depends. | | public String | getName()
| | protected List<ResourceNode> | getPath()
| | public List<DataValueChangedCallbackListener> | getSubscribers()
Returns a list of listeners on this formula. | | protected boolean | hasArgs(String[] args)
| | protected void | initialize(ResourceContext context)
| | protected void | postInitialize()
| | public DataValue | query()
Returns the currently cached value. | | protected void | registerDependency(DataFormula formula, String key)
| | protected DataFormula | registerDependency(ResourceContext context, String formulaName)
| | protected DataFormula | registerDependency(ResourceContext context, String formulaName, String[] formulaArgs)
| | protected DataFormula | registerDependency(ResourceContext context, String formulaName, String key)
| | protected DataFormula | registerDependency(ResourceContext context, String formulaName, String[] formulaArgs, String key)
| | public void | reinitialize()
| | protected void | setArgs(String[] args)
| | protected synchronized void | setCachedValue(DataValue cachedValue)
| | protected void | setName(String name)
| | public boolean | shouldNotify(DataValue value)
| | public void | subscribe(DataValueChangedCallbackListener listener)
Registers the listener so that will be called back when the value of this
one changes. | | public String | toString()
| | public void | unsubscribe(DataValueChangedCallbackListener listener)
Unregisters the listener for callbackes. |
| blockingQuery | | public DataValue blockingQuery()(Code) | | Computes and returns a new value. This is part of the standard (non-gui)
DataFormula interface.
|
| contextDeleted | | void contextDeleted()(Code) | | |
| dataValueChanged | | public void dataValueChanged(DataFormula changedFormula)(Code) | | Implements the DataValueChangedCallbackListener. This would typically be
called here when one of the other formulas on which this one depends has
a new value.
|
| doCalculation | | abstract protected DataValue doCalculation(Values values)(Code) | | Instantiable subclasses provide this to do the formula's work, if there's
any to do.
|
| getDependencies | | public List<DataFormula> getDependencies()(Code) | | Returns a list of other formulas on which this one depends. Only used by
the ResourceContext gui (so far).
|
| postInitialize | | protected void postInitialize()(Code) | | |
| query | | public DataValue query()(Code) | | Returns the currently cached value. This is part of the standard
(non-gui) DataFormula interface.
|
| reinitialize | | public void reinitialize()(Code) | | |
| setCachedValue | | protected synchronized void setCachedValue(DataValue cachedValue)(Code) | | |
| subscribe | | public void subscribe(DataValueChangedCallbackListener listener)(Code) | | Registers the listener so that will be called back when the value of this
one changes. This is part of standard (non-gui) DataFormula interface.
|
|
|