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package org.jvnet.hk2.config;

import java.beans.PropertyChangeEvent;
import java.util.List;

/**
 * Any object that want to be part of a configuration transaction 
 * should implement this interface.
 *
 * @author Jerome Dochez
 */
public interface Transactor {

	/**
	 * Enter a new Transaction, this method should return false if this object
	 * is already enlisted in another transaction, or cannot be enlisted with
	 * the passed transaction. If the object returns true, the object
	 * is enlisted in the passed transaction and cannot be enlisted in another 
	 * transaction until either commit or abort has been issued.
	 * 
	 * @param t the transaction to enlist with
	 * @return true if the enlisting with the passed transaction was accepted, 
	 * false otherwise
	 */
    public boolean join(Transaction t);
	
	/**
	 * Returns true of this Transaction can be committed on this object
	 *
	 * @param t is the transaction to commit, should be the same as the
	 * one passed during the join(Transaction t) call.
	 *
	 * @return true if the transaction committing would be successful
     * @throws TransactionFailure if the changes cannot be validated
	 */
    public boolean canCommit(Transaction t) throws TransactionFailure;

	/**
	 * Commit this Transaction.
	 *
	 * @param t the transaction commiting.
     * @return list of applied property changes
	 * @throws TransactionFailure if the transaction commit failed
	 */
    public List commit(Transaction t) throws TransactionFailure;

	/**
	 * Aborts this Transaction, reverting the state
	 
	 * @param t the aborting transaction
	 */
    public void abort(Transaction t);
}