TransactionSystem.java

package org.prevayler.demos.scalability.prevayler;
import java.util.HashMap;
import java.util.Map;
import org.prevayler.demos.scalability.Record;
import org.prevayler.demos.scalability.RecordIterator;

class TransactionSystem implements ScalabilitySystem {
  private static final long serialVersionUID=461535927650714306L;
  private final Map recordsById=new HashMap();
  public void performTransaction(  Record recordToInsert,  Record recordToUpdate,  long idToDelete){
synchronized (recordsById) {
      put(recordToInsert);
      put(recordToUpdate);
      recordsById.remove(new Long(idToDelete));
    }
  }
  private Object put(  Record newRecord){
    Object key=new Long(newRecord.getId());
    return recordsById.put(key,newRecord);
  }
  public void replaceAllRecords(  RecordIterator newRecords){
    recordsById.clear();
    while (newRecords.hasNext()) {
      put(newRecords.next());
    }
  }
  public int hashCode(){
    return recordsById.hashCode();
  }
}