javolution.lang
Class Configurable.Logic

java.lang.Object
  javolution.lang.Configurable.Logic

Enclosing class:

Configurable<T>

public abstract static class Configurable.Logic
extends java.lang.Object

This class represents a configuration logic capable of setting Configurable values. For example:

 class MyApplication {
     private static final Configuration CONFIGURATION = new Configuration();
     public static void main(String[] args) {
         CONFIGURATION.run();
         ...       
     }
     static class Configuration extends Configurable.Logic implements Runnable {
         public void run() {
             Properties properties = System.getProperties();
             // Properties could be loaded automatically if the property names 
             // were the full names of the configurable fields (ref. Configurable.read(Map)).
             String concurrency = properties.get("MAXIMUM_CONCURRENCY");
             if (concurrency != null) { 
                 configure(ConcurrentContext.MAXIMUM_CONCURRENCY, TypeFormat.parseInt(concurrency));
             }                
             ...
         }
    }
 }

Applications can prevent further configuration modifications using Configurable.setUnmodifiable() or custom SecurityContext. For example:

 public class MyPolicy extends SecurityContext {
     public boolean isModifiable (Configurable cfg) {
         return false;
     }
 }
  ...
  configure(SecurityContext.DEFAULT, MyPolicy.class); // Global setting.
  

Constructor Summary

Configurable.Logic()

Method Summary

protected <T> void

configure(Configurable<T> cfg, T value) Sets the run-time value of the specified configurable.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Configurable.Logic

public Configurable.Logic()

Method Detail

configure

protected final <T> void configure(Configurable<T> cfg,
                                   T value)

Sets the run-time value of the specified configurable. If configurable value is different from the previous one, then Configurable.notifyChange() is called. This method raises SecurityException if the specified configurable is not modifiable.

Parameters:

cfg - the configurable being configurated.

value - the new run-time value.

Throws:

java.lang.SecurityException - if the specified configurable cannot be modified.