package simpledb;

import java.io.*;
import java.util.*;

/**
 * Transaction encapsulates information about the state of
 * a transaction and manages transaction commit / abort.
 */

public class Transaction {
    TransactionId tid;
    boolean started = false;

    public Transaction() {
	tid = new TransactionId();
    }
    
    /** Start the transaction running */
    public void start() {
	started = true;
	// some code goes here
        // Actually, no code goes here!
    }

    public TransactionId tid() {
	return tid;
    }

    /** Finish the transaction */
    public void commit() throws IOException {
	transactionComplete(false);
    }

    /** Handle the details of transaction commit / abort */
    public void transactionComplete(boolean abort) throws IOException {
        Database.getBufferPool().transactionComplete(tid, !abort);
    }

}