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| package org.jboss.cache.pojo.memory; |
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| |
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| import org.apache.commons.logging.Log; |
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| import org.apache.commons.logging.LogFactory; |
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| |
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| import java.lang.ref.Reference; |
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| import java.lang.ref.SoftReference; |
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| import java.lang.ref.WeakReference; |
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| public abstract class PersistentReference |
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| { |
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| static final int REFERENCE_WEAK = 1; |
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| public static final int REFERENCE_SOFT = 2; |
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| |
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| private static final Log log = LogFactory.getLog(PersistentReference.class); |
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| private static final boolean isDebug = log.isDebugEnabled(); |
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| |
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| private WeakReference classReference; |
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| private Reference referencedObject; |
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| private int referenceType = 0; |
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4353
| public PersistentReference(Class clazz, Object referencedObject, int referenceType)
|
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| { |
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4353
| this.referenceType = referenceType;
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4353
| if (clazz != null)
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| { |
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4353
| classReference = new WeakReference(clazz);
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| } |
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4353
| buildReference(referencedObject);
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| } |
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0
| Object internalGet()
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| { |
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| if (referencedObject == null)
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| return null;
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| return referencedObject.get();
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| |
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| } |
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22841
| public Object get()
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| { |
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22841
| if (referencedObject == null)
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0
| return null;
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| |
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22841
| Object returnValue = referencedObject.get();
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22841
| if (returnValue == null)
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| { |
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0
| try
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| { |
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| if (isDebug) log.debug("Reference on " + this.getClass().getName() + " being rebuilt");
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| |
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| |
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| return rebuildReference();
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| } |
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| catch (RuntimeException re) |
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| { |
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| throw re;
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| } |
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| catch (Exception e) |
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| { |
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| throw new RuntimeException(e.getMessage(), e);
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| } |
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| } |
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22841
| return returnValue;
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| } |
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| protected abstract Object rebuildReference() throws Exception; |
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4353
| void buildReference(Object obj)
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| { |
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4353
| if (obj == null)
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| { |
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| referencedObject = null;
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| } |
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| else |
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| { |
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4353
| if (referenceType == REFERENCE_WEAK)
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| { |
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| referencedObject = new WeakReference(obj);
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| } |
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| else |
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| { |
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4353
| referencedObject = new SoftReference(obj);
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| } |
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| } |
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| } |
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| |
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0
| Class getMappedClass()
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| { |
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| if (classReference == null) return null;
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| Class returnClass = (Class) classReference.get();
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| if (returnClass == null)
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| { |
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| throw new RuntimeException("Class was already unloaded");
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| } |
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| return (Class) returnClass;
|
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| } |
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| |
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| } |