Interface DepositBox

All Known Implementing Classes:
ObjectLock

public interface DepositBox
DepositBox is an interface for ClassMolder to access the dirty checking cache of an object.

Checking for accessMode will be done to each access of the DepositBox. Only if a transaction has write access may setObject() or IllegalArgumentException will be thrown.

Only if a transaction with read or write access may call getObject(). Multiple transactions may own read access of the same DespositBox at the same time. Only one transaction may own write access at any given time.

Every time setObject() is called, the internal timestamp will be updated.

Author:
Thomas Yip
  • Method Summary

    Modifier and Type
    Method
    Description
    Get the object from the DespositBox, only the transaction have the read or write lock can get it.
    Get the object's OID.
    long
     
    void
    setObject(TransactionContext tx, Object[] object, long version)
    Set an object into the DespositBox, only a transaction has the write lock may call it method or IllegalArgumentException will be thrown.
    void
    setVersion(long version)
    Sets the new version of this object.
  • Method Details

    • getOID

      OID getOID()
      Get the object's OID.
      Returns:
      the object's OID.
    • setObject

      void setObject(TransactionContext tx, Object[] object, long version)
      Set an object into the DespositBox, only a transaction has the write lock may call it method or IllegalArgumentException will be thrown.
      Parameters:
      tx - the transaction in action
      object - to be store into deposit box
      version - of the object to be stored
    • getObject

      Object[] getObject(TransactionContext tx)
      Get the object from the DespositBox, only the transaction have the read or write lock can get it.
      Parameters:
      tx - the transaction in action
      Returns:
      An object instance.
    • getVersion

      long getVersion()
      Returns:
      the version (a timestamp) of the last setObject(object) call.
    • setVersion

      void setVersion(long version)
      Sets the new version of this object.
      Parameters:
      version - a timestamp.