Examples of com.persistit.encoding.CoderManager

• com.persistit.encoding.CoderManager
  e MyClass1 and MyClass2 Object b = new MyClass2(); // have registered KeyCoders exchange.to(a).store(); // store something with a's value as key exchange.to(b).store(); // store something with b's value as key exchange.to(Key.BEFORE) while (exchange.next()) { System.out.println(exchange.indexTo(-1).getTypeName()); } This code will insert two records incorporating the values a and b into Persistit, and will then traverse the resulting tree and print the names of the classes of the key values. The question is whether "MyClass2" will be printed before or after "MyClass2".

  The answer depends on the order in which MyClass1 and MyClass2 were first registered within Persistit. At the time a new class is first registered, Persistit assigns a permanent int-valued class handle to the class. Whenever an instance of that class is encoded within either a Key or a Value, that handle value, rather than the class name, is used. This reduces disk, memory and CPU consumption whenever Persistit stores or retrieves objects. Handles are assigned in increasing numeric order as classes are registered. Thus if MyClass1 was registered before MyClass2, it will precede MyClass2 in traversal order. Otherwise it will follow MyClass2.

  @version 1.0

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