Revision 2571 org.gvsig.tools/library/trunk/org.gvsig.tools/org.gvsig.tools.lib/src/main/java/org/gvsig/tools/util/CachedValue.java

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CachedValue.java
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/**
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 * gvSIG. Desktop Geographic Information System.
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 *
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 * Copyright (C) 2007-2020 gvSIG Association.
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 * Copyright (C) 2007-2021 gvSIG Association.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
......
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/**


  		




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 *


  		




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 * @author jjdelcerro


  		




  
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 * @author gvSIG Team


  		




  
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 * @param <T>


  		




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 */


  		




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public abstract class CachedValue<T> {


  		




  
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public class CachedValue<T> {


  		




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  private T value = null;


  		




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  private long lastAccess = 0;


  		




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  private long expireTimeInMillis;


  		




  
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  private java.util.concurrent.Callable<T> reload;


  		




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  public CachedValue() {


  		




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    this(3000);


  		




  
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    this(3000, null);


  		




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  }


  		




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  public CachedValue(long expireTimeInMillis) {


  		




  
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    this(expireTimeInMillis, null);


  		




  
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  }


  		




  
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  public CachedValue(java.util.concurrent.Callable<T> reload) {


  		




  
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      this(3000, reload);


  		




  
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  }


  		




  
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  public CachedValue(long expireTimeInMillis, java.util.concurrent.Callable<T> reload) {


  		




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    this.expireTimeInMillis = expireTimeInMillis;


  		




  
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    this.reload = reload;


  		




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  }


  		




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  protected void reload() {


  		




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    // Overwrite this method.


  		




  
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    if( this.reload!=null ) {


  		




  
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        try {


  		




  
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            this.value = this.reload.call();


  		




  
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        } catch (Exception ex) {


  		




  
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            // FIXME: calling Callable.call exception ??


  		




  
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        }


  		




  
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    }


  		




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  }


  		




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  protected final T getValue() {


  		












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