CODEWITHSUNDEEP
javacard
Jean
Jean

Reputation: 697

Object Deletion Management in javacards

Below, You see a part of Application Programming Notes Java Card 3 Platform Classic Edition about object deletion management :

void updateBuffer(byte requiredSize)
     {
     try
       {
          if(buffer != null && buffer.length == requiredSize)
             {
              //we already have a buffer of required size
              return;
             }

          JCSystem.beginTransaction();
          byte[] oldBuffer = buffer;
          buffer = new byte[requiredSize];

          if (oldBuffer != null)
             JCSystem.requestObjectDeletion();

          JCSystem.commitTransaction();
      }

    catch(Exception e)
      {
          JCSystem.abortTransaction();
      }
   }

The question is :

When I call JCSystem.requestObjectDeletion(); in the ifexpression, How it recognize which one the buffer or oldBuffer object must be delete?

Upvotes: 0

Views: 209

Answers (1)

Maarten Bodewes
Maarten Bodewes

Reputation: 93948

Object deletion is typically performed during start up. So basically the system can sweep the memory just like a normal Java Garbage Collector at that time.

If no references are found to a specific object, then the space occupied by that object can be collected. As the oldBuffer reference is out of scope by that time there will be no reference to the old array left. The exact memory management is implementation dependent.

Upvotes: 2

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