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HSQLDB - Lightweight 100% Java SQL Database Engine
package org.hsqldb.test;
// nbazin@users - enhancements to the original code
// fredt@users - 20050202 - corrected getRandomID(int) to return a randomly distributed value
/*
* This is a sample implementation of the Transaction Processing Performance
* Council Benchmark B coded in Java and ANSI SQL2.
*
* This version is using one connection per thread to parallellize
* server operations.
* @author Mark Matthews ([email protected])
*/
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Enumeration;
import java.util.Vector;
class JDBCBench {
/* tpc bm b scaling rules */
public static int tps = 1; /* the tps scaling factor: here it is 1 */
public static int nbranches = 1; /* number of branches in 1 tps db */
public static int ntellers = 10; /* number of tellers in 1 tps db */
public static int naccounts = 100000; /* number of accounts in 1 tps db */
public static int nhistory = 864000; /* number of history recs in 1 tps db */
public static final int TELLER = 0;
public static final int BRANCH = 1;
public static final int ACCOUNT = 2;
int failed_transactions = 0;
int transaction_count = 0;
static int n_clients = 10;
static int n_txn_per_client = 10;
long start_time = 0;
static boolean transactions = true;
static boolean prepared_stmt = false;
static String tableExtension = "";
static String createExtension = "";
static String ShutdownCommand = "";
static PrintStream TabFile = null;
static boolean verbose = false;
MemoryWatcherThread MemoryWatcher;
/* main program, creates a 1-tps database: i.e. 1 branch, 10 tellers,...
* runs one TPC BM B transaction
* example command line:
* -driver org.hsqldb.jdbc.JDBCDriver -url jdbc:hsqldb:/hsql/jdbcbench/test -user SA -clients 20 -tpc 10000
*/
public static void main(String[] Args) {
String DriverName = "";
String DBUrl = "";
String DBUser = "";
String DBPassword = "";
boolean initialize_dataset = false;
for (int i = 0; i < Args.length; i++) {
if (Args[i].equals("-clients")) {
if (i + 1 < Args.length) {
i++;
n_clients = Integer.parseInt(Args[i]);
}
} else if (Args[i].equals("-driver")) {
if (i + 1 < Args.length) {
i++;
DriverName = Args[i];
if (DriverName.equals(
"org.enhydra.instantdb.jdbc.idbDriver")) {
ShutdownCommand = "SHUTDOWN";
}
if (DriverName.equals(
"com.borland.datastore.jdbc.DataStoreDriver")) {
//
}
if (DriverName.equals("com.mckoi.JDBCDriver")) {
ShutdownCommand = "SHUTDOWN";
}
if (DriverName.equals("org.hsqldb.jdbc.JDBCDriver")
|| DriverName.equals("org.hsqldb.jdbcDriver")) {
tableExtension = "CREATE CACHED TABLE ";
// ShutdownCommand = "SHUTDOWN";
}
}
} else if (Args[i].equals("-url")) {
if (i + 1 < Args.length) {
i++;
DBUrl = Args[i];
}
} else if (Args[i].equals("-user")) {
if (i + 1 < Args.length) {
i++;
DBUser = Args[i];
}
} else if (Args[i].equals("-tabfile")) {
if (i + 1 < Args.length) {
i++;
try {
FileOutputStream File = new FileOutputStream(Args[i]);
TabFile = new PrintStream(File);
} catch (Exception e) {
TabFile = null;
}
}
} else if (Args[i].equals("-password")) {
if (i + 1 < Args.length) {
i++;
DBPassword = Args[i];
}
} else if (Args[i].equals("-tpc")) {
if (i + 1 < Args.length) {
i++;
n_txn_per_client = Integer.parseInt(Args[i]);
}
} else if (Args[i].equals("-init")) {
initialize_dataset = true;
} else if (Args[i].equals("-tps")) {
if (i + 1 < Args.length) {
i++;
tps = Integer.parseInt(Args[i]);
}
} else if (Args[i].equals("-v")) {
verbose = true;
}
}
if (DriverName.length() == 0 || DBUrl.length() == 0) {
System.out.println(
"usage: java JDBCBench -driver [driver_class_name] -url [url_to_db] -user [username] -password [password] [-v] [-init] [-tpc n] [-clients n]");
System.out.println();
System.out.println("-v verbose error messages");
System.out.println("-init initialize the tables");
System.out.println("-tpc transactions per client");
System.out.println("-clients number of simultaneous clients");
System.exit(-1);
}
System.out.println(
"*********************************************************");
System.out.println(
"* JDBCBench v1.1 *");
System.out.println(
"*********************************************************");
System.out.println();
System.out.println("Driver: " + DriverName);
System.out.println("URL:" + DBUrl);
System.out.println();
System.out.println("Scale factor value: " + tps);
System.out.println("Number of clients: " + n_clients);
System.out.println("Number of transactions per client: "
+ n_txn_per_client);
System.out.println();
try {
Class.forName(DriverName);
JDBCBench Me = new JDBCBench(DBUrl, DBUser, DBPassword,
initialize_dataset);
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
}
public JDBCBench(String url, String user, String password, boolean init) {
Vector vClient = new Vector();
Thread Client = null;
Enumeration e = null;
Connection guardian = null;
try {
java.util.Date start = new java.util.Date();
if (init) {
System.out.println("Start: " + start.toString());
System.out.print("Initializing dataset...");
createDatabase(url, user, password);
double seconds = (System.currentTimeMillis() - start.getTime())
/ 1000D;
System.out.println("done. in " + seconds + " seconds\n");
System.out.println("Complete: "
+ (new java.util.Date()).toString());
}
System.out.println("* Starting Benchmark Run *");
MemoryWatcher = new MemoryWatcherThread();
MemoryWatcher.start();
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
/*
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
oneRound(url, user, password, transactions, true);
*/
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
} finally {
MemoryWatcher.end();
try {
MemoryWatcher.join();
if (ShutdownCommand.length() > 0) {
guardian = connect(url, user, password);
Statement Stmt = guardian.createStatement();
Stmt.execute("SHUTDOWN IMMEDIATELY");
Stmt.close();
connectClose(guardian);
}
if (TabFile != null) {
TabFile.close();
}
} catch (Exception E1) {}
// System.exit(0);
}
}
void oneRound(String url, String user, String password,
boolean transactions,
boolean prepared) throws InterruptedException, SQLException {
Vector vClient = new Vector();
Thread Client = null;
Enumeration e = null;
Connection guardian = null;
//
this.transactions = transactions;
this.prepared_stmt = prepared;
start_time = System.currentTimeMillis();
for (int i = 0; i < n_clients; i++) {
Client = new ClientThread(n_txn_per_client, url, user, password,
Connection.TRANSACTION_READ_COMMITTED);
Client.start();
vClient.addElement(Client);
}
/*
** Barrier to complete this test session
*/
e = vClient.elements();
while (e.hasMoreElements()) {
Client = (Thread) e.nextElement();
Client.join();
}
vClient.removeAllElements();
reportDone();
guardian = connect(url, user, password);
checkSums(guardian);
connectClose(guardian);
}
public void reportDone() {
long end_time = System.currentTimeMillis();
double completion_time = ((double) end_time - (double) start_time)
/ 1000;
if (TabFile != null) {
TabFile.print(tps + ";" + n_clients + ";" + n_txn_per_client
+ ";");
}
System.out.println("\n* Benchmark Report *");
System.out.print("* Featuring ");
if (prepared_stmt) {
System.out.print(" ");
if (TabFile != null) {
TabFile.print(";");
}
} else {
System.out.print(" ");
if (TabFile != null) {
TabFile.print(";");
}
}
if (transactions) {
System.out.print(" ");
if (TabFile != null) {
TabFile.print(";");
}
} else {
System.out.print(" ");
if (TabFile != null) {
TabFile.print(";");
}
}
System.out.println("\n--------------------");
System.out.println("Time to execute " + transaction_count
+ " transactions: " + completion_time
+ " seconds.");
System.out.println("Max/Min memory usage: "
+ (MemoryWatcher.max / 1024) + " / "
+ (MemoryWatcher.min / 1024) + " kb");
System.out.println(failed_transactions + " / " + transaction_count
+ " failed to complete.");
double rate = (transaction_count - failed_transactions)
/ completion_time;
System.out.println("Transaction rate: " + rate + " txn/sec.");
if (TabFile != null) {
TabFile.print((MemoryWatcher.max / 1024) + ";"
+ (MemoryWatcher.min / 1024) + ";"
+ failed_transactions + ";" + rate + "\n");
}
transaction_count = 0;
failed_transactions = 0;
MemoryWatcher.reset();
}
public synchronized void incrementTransactionCount() {
transaction_count++;
}
public synchronized void incrementFailedTransactionCount() {
failed_transactions++;
}
void createDatabase(String url, String user,
String password) throws Exception {
Connection Conn = connect(url, user, password);
String s = Conn.getMetaData().getDatabaseProductName();
System.out.println("DBMS: " + s);
transactions = true;
if (transactions) {
try {
Conn.setAutoCommit(false);
System.out.println("In transaction mode");
} catch (SQLException Etrxn) {
transactions = false;
}
}
try {
int accountsnb = 0;
Statement Stmt = Conn.createStatement();
String Query;
//
Stmt.execute("SET WRITE_DELAY 10000 MILLIS;");
Stmt.execute("SET PROPERTY \"hsqldb.cache_scale\" 16;");
//
Query = "SELECT count(*) ";
Query += "FROM accounts";
ResultSet RS = Stmt.executeQuery(Query);
Stmt.clearWarnings();
while (RS.next()) {
accountsnb = RS.getInt(1);
}
if (transactions) {
Conn.commit();
}
Stmt.close();
if (accountsnb == (naccounts * tps)) {
System.out.println("Already initialized");
connectClose(Conn);
return;
}
} catch (Exception E) {}
System.out.println("Drop old tables if they exist");
try {
Statement Stmt = Conn.createStatement();
String Query;
Query = "DROP TABLE history";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DROP TABLE accounts";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DROP TABLE tellers";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DROP TABLE branches";
Stmt.execute(Query);
Stmt.clearWarnings();
if (transactions) {
Conn.commit();
}
Stmt.close();
} catch (Exception E) {}
System.out.println("Creates tables");
try {
Statement Stmt = Conn.createStatement();
String Query;
if (tableExtension.length() > 0) {
Query = tableExtension + " branches (";
} else {
Query = "CREATE TABLE branches (";
}
Query += "Bid INTEGER NOT NULL PRIMARY KEY, ";
Query += "Bbalance INTEGER,";
Query += "filler CHAR(88))"; /* pad to 100 bytes */
if (createExtension.length() > 0) {
Query += createExtension;
}
Stmt.execute(Query);
Stmt.clearWarnings();
if (tableExtension.length() > 0) {
Query = tableExtension + " tellers (";
} else {
Query = "CREATE TABLE tellers (";
}
Query += "Tid INTEGER NOT NULL PRIMARY KEY,";
Query += "Bid INTEGER,";
Query += "Tbalance INTEGER,";
Query += "filler CHAR(84))"; /* pad to 100 bytes */
if (createExtension.length() > 0) {
Query += createExtension;
}
Stmt.execute(Query);
Stmt.clearWarnings();
if (tableExtension.length() > 0) {
Query = tableExtension + " accounts (";
} else {
Query = "CREATE TABLE accounts (";
}
Query += "Aid INTEGER NOT NULL PRIMARY KEY, ";
Query += "Bid INTEGER, ";
Query += "Abalance INTEGER, ";
Query += "filler CHAR(84))"; /* pad to 100 bytes */
if (createExtension.length() > 0) {
Query += createExtension;
}
Stmt.execute(Query);
Stmt.clearWarnings();
if (tableExtension.length() > 0) {
Query = tableExtension + " history (";
} else {
Query = "CREATE TABLE history (";
}
Query += "Tid INTEGER, ";
Query += "Bid INTEGER, ";
Query += "Aid INTEGER, ";
Query += "delta INTEGER, ";
Query += "tstime TIMESTAMP, ";
Query += "filler CHAR(22))"; /* pad to 50 bytes */
if (createExtension.length() > 0) {
Query += createExtension;
}
Stmt.execute(Query);
Stmt.clearWarnings();
/*
Stmt.execute("SET TABLE ACCOUNTS SOURCE \"ACCOUNTS.TXT\"");
Stmt.execute("SET TABLE BRANCHES SOURCE \"BBRANCHES.TXT\"");
Stmt.execute("SET TABLE TELLERS SOURCE \"TELLERS.TXT\"");
Stmt.execute("SET TABLE HISTORY SOURCE \"HISTORY.TXT\"");
*/
if (transactions) {
Conn.commit();
}
Stmt.close();
} catch (Exception E) {
System.out.println(
"Delete elements in table in case Drop didn't work");
}
System.out.println(
"Delete elements in table in case Drop didn't work");
try {
Statement Stmt = Conn.createStatement();
String Query;
Query = "DELETE FROM history";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DELETE FROM accounts";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DELETE FROM tellers";
Stmt.execute(Query);
Stmt.clearWarnings();
Query = "DELETE FROM branches";
Stmt.execute(Query);
Stmt.clearWarnings();
if (transactions) {
Conn.commit();
}
/* prime database using TPC BM B scaling rules.
** Note that for each branch and teller:
** branch_id = teller_id / ntellers
** branch_id = account_id / naccounts
*/
PreparedStatement pstmt = null;
prepared_stmt = true;
if (prepared_stmt) {
try {
Query = "INSERT INTO branches(Bid,Bbalance) VALUES (?,0)";
pstmt = Conn.prepareStatement(Query);
System.out.println("Using prepared statements");
} catch (SQLException Epstmt) {
pstmt = null;
prepared_stmt = false;
}
}
System.out.println("Insert data in branches table");
for (int i = 0; i < nbranches * tps; i++) {
if (prepared_stmt) {
pstmt.setInt(1, i);
pstmt.executeUpdate();
pstmt.clearWarnings();
} else {
Query = "INSERT INTO branches(Bid,Bbalance) VALUES (" + i
+ ",0)";
Stmt.executeUpdate(Query);
}
if ((i % 100 == 0) && (transactions)) {
Conn.commit();
}
}
if (prepared_stmt) {
pstmt.close();
}
if (transactions) {
Conn.commit();
}
if (prepared_stmt) {
Query = "INSERT INTO tellers(Tid,Bid,Tbalance) VALUES (?,?,0)";
pstmt = Conn.prepareStatement(Query);
}
System.out.println("Insert data in tellers table");
for (int i = 0; i < ntellers * tps; i++) {
if (prepared_stmt) {
pstmt.setInt(1, i);
pstmt.setInt(2, i / ntellers);
pstmt.executeUpdate();
pstmt.clearWarnings();
} else {
Query = "INSERT INTO tellers(Tid,Bid,Tbalance) VALUES ("
+ i + "," + i / ntellers + ",0)";
Stmt.executeUpdate(Query);
}
if ((i % 100 == 0) && (transactions)) {
Conn.commit();
}
}
if (prepared_stmt) {
pstmt.close();
}
if (transactions) {
Conn.commit();
}
if (prepared_stmt) {
Query =
"INSERT INTO accounts(Aid,Bid,Abalance) VALUES (?,?,0)";
pstmt = Conn.prepareStatement(Query);
}
System.out.println("Insert data in accounts table");
for (int i = 0; i < naccounts * tps; i++) {
if (prepared_stmt) {
pstmt.setInt(1, i);
pstmt.setInt(2, i / naccounts);
pstmt.executeUpdate();
pstmt.clearWarnings();
} else {
Query = "INSERT INTO accounts(Aid,Bid,Abalance) VALUES ("
+ i + "," + i / naccounts + ",0)";
Stmt.executeUpdate(Query);
}
if ((i % 10000 == 0) && (transactions)) {
Conn.commit();
}
if ((i > 0) && ((i % 10000) == 0)) {
System.out.println("\t" + i + "\t records inserted");
}
}
if (prepared_stmt) {
pstmt.close();
}
if (transactions) {
Conn.commit();
}
System.out.println("\t" + (naccounts * tps)
+ "\t records inserted");
// for tests
if (ShutdownCommand.length() > 0) {
Stmt.execute(ShutdownCommand);
}
Stmt.close();
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
connectClose(Conn);
} /* end of CreateDatabase */
public static int getRandomInt(int lo, int hi) {
int ret = 0;
ret = (int) (Math.random() * (hi - lo + 1));
ret += lo;
return ret;
}
public static int getRandomID(int type) {
int min = 0,
max = 0;
switch (type) {
case TELLER :
max = ntellers * tps - 1;
break;
case BRANCH :
max = nbranches * tps - 1;
break;
case ACCOUNT :
max = naccounts * tps - 1;
break;
}
return getRandomInt(min, max);
}
public static Connection connect(String DBUrl, String DBUser,
String DBPassword) {
try {
Connection conn = DriverManager.getConnection(DBUrl, DBUser,
DBPassword);
return conn;
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
return null;
}
public static void connectClose(Connection c) {
if (c == null) {
return;
}
try {
c.close();
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
}
void checkSums(Connection conn) throws SQLException {
Statement st1 = null;
ResultSet rs = null;
int bbalancesum;
int tbalancesum;
int abalancesum;
int deltasum;
try {
st1 = conn.createStatement();
rs = st1.executeQuery("select sum(bbalance) from branches");
rs.next();
bbalancesum = rs.getInt(1);
rs.close();
rs = st1.executeQuery("select sum(tbalance) from tellers");
rs.next();
tbalancesum = rs.getInt(1);
rs.close();
rs = st1.executeQuery("select sum(abalance) from accounts");
rs.next();
abalancesum = rs.getInt(1);
rs.close();
rs = st1.executeQuery("select sum(delta) from history");
rs.next();
deltasum = rs.getInt(1);
rs.close();
rs = null;
st1.close();
st1 = null;
if (abalancesum != bbalancesum || bbalancesum != tbalancesum
|| tbalancesum != deltasum) {
System.out.println("sums don't match!");
} else {
System.out.println("sums match!");
}
System.out.println("A " + abalancesum + " B " + bbalancesum
+ " T " + tbalancesum + " H " + deltasum);
} finally {
if (st1 != null) {
st1.close();
}
}
}
class ClientThread extends Thread {
int ntrans = 0;
Connection Conn;
PreparedStatement pstmt1 = null;
PreparedStatement pstmt2 = null;
PreparedStatement pstmt3 = null;
PreparedStatement pstmt4 = null;
PreparedStatement pstmt5 = null;
public ClientThread(int number_of_txns, String url, String user,
String password, int transactionMode) {
System.out.println(number_of_txns);
ntrans = number_of_txns;
Conn = connect(url, user, password);
if (Conn == null) {
return;
}
try {
if (transactions) {
Conn.setAutoCommit(false);
}
Conn.setTransactionIsolation(transactionMode);
if (prepared_stmt) {
String Query;
Query = "UPDATE accounts ";
Query += "SET Abalance = Abalance + ? ";
Query += "WHERE Aid = ?";
pstmt1 = Conn.prepareStatement(Query);
Query = "SELECT Abalance ";
Query += "FROM accounts ";
Query += "WHERE Aid = ?";
pstmt2 = Conn.prepareStatement(Query);
Query = "UPDATE tellers ";
Query += "SET Tbalance = Tbalance + ? ";
Query += "WHERE Tid = ?";
pstmt3 = Conn.prepareStatement(Query);
Query = "UPDATE branches ";
Query += "SET Bbalance = Bbalance + ? ";
Query += "WHERE Bid = ?";
pstmt4 = Conn.prepareStatement(Query);
Query = "INSERT INTO history(Tid, Bid, Aid, delta) ";
Query += "VALUES (?,?,?,?)";
pstmt5 = Conn.prepareStatement(Query);
}
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
}
public void run() {
while (ntrans-- > 0) {
int account = JDBCBench.getRandomID(ACCOUNT);
int branch = JDBCBench.getRandomID(BRANCH);
int teller = JDBCBench.getRandomID(TELLER);
int delta = JDBCBench.getRandomInt(0, 1000);
doOne(branch, teller, account, delta);
incrementTransactionCount();
}
if (prepared_stmt) {
try {
if (pstmt1 != null) {
pstmt1.close();
}
if (pstmt2 != null) {
pstmt2.close();
}
if (pstmt3 != null) {
pstmt3.close();
}
if (pstmt4 != null) {
pstmt4.close();
}
if (pstmt5 != null) {
pstmt5.close();
}
} catch (Exception E) {
System.out.println(E.toString());
E.printStackTrace();
}
}
connectClose(Conn);
Conn = null;
}
/*
** doOne() - Executes a single TPC BM B transaction.
*/
int doOne(int bid, int tid, int aid, int delta) {
int aBalance = 0;
if (Conn == null) {
incrementFailedTransactionCount();
return 0;
}
try {
if (prepared_stmt) {
pstmt1.setInt(1, delta);
pstmt1.setInt(2, aid);
pstmt1.executeUpdate();
pstmt1.clearWarnings();
pstmt2.setInt(1, aid);
ResultSet RS = pstmt2.executeQuery();
pstmt2.clearWarnings();
while (RS.next()) {
aBalance = RS.getInt(1);
}
pstmt3.setInt(1, delta);
pstmt3.setInt(2, tid);
pstmt3.executeUpdate();
pstmt3.clearWarnings();
pstmt4.setInt(1, delta);
pstmt4.setInt(2, bid);
pstmt4.executeUpdate();
pstmt4.clearWarnings();
pstmt5.setInt(1, tid);
pstmt5.setInt(2, bid);
pstmt5.setInt(3, aid);
pstmt5.setInt(4, delta);
pstmt5.executeUpdate();
pstmt5.clearWarnings();
} else {
Statement Stmt = Conn.createStatement();
String Query = "UPDATE accounts ";
Query += "SET Abalance = Abalance + " + delta + " ";
Query += "WHERE Aid = " + aid;
int res = Stmt.executeUpdate(Query);
Stmt.clearWarnings();
Query = "SELECT Abalance ";
Query += "FROM accounts ";
Query += "WHERE Aid = " + aid;
ResultSet RS = Stmt.executeQuery(Query);
Stmt.clearWarnings();
while (RS.next()) {
aBalance = RS.getInt(1);
}
Query = "UPDATE tellers ";
Query += "SET Tbalance = Tbalance + " + delta + " ";
Query += "WHERE Tid = " + tid;
Stmt.executeUpdate(Query);
Stmt.clearWarnings();
Query = "UPDATE branches ";
Query += "SET Bbalance = Bbalance + " + delta + " ";
Query += "WHERE Bid = " + bid;
Stmt.executeUpdate(Query);
Stmt.clearWarnings();
Query = "INSERT INTO history(Tid, Bid, Aid, delta) ";
Query += "VALUES (";
Query += tid + ",";
Query += bid + ",";
Query += aid + ",";
Query += delta + ")";
Stmt.executeUpdate(Query);
Stmt.clearWarnings();
Stmt.close();
}
if (transactions) {
Conn.commit();
}
return aBalance;
} catch (Exception E) {
if (verbose) {
System.out.println("Transaction failed: "
+ E.toString());
E.printStackTrace();
}
incrementFailedTransactionCount();
if (transactions) {
try {
Conn.rollback();
} catch (SQLException E1) {}
}
}
return 0;
} /* end of DoOne */
} /* end of class ClientThread */
class MemoryWatcherThread extends Thread {
long min = 0;
long max = 0;
boolean keep_running = true;
public MemoryWatcherThread() {
this.reset();
keep_running = true;
}
public void reset() {
long currentFree = Runtime.getRuntime().freeMemory();
long currentAlloc = Runtime.getRuntime().totalMemory();
min = max = (currentAlloc - currentFree);
}
public void end() {
keep_running = false;
}
public void run() {
while (keep_running) {
long currentFree = Runtime.getRuntime().freeMemory();
long currentAlloc = Runtime.getRuntime().totalMemory();
long used = currentAlloc - currentFree;
if (used < min) {
min = used;
}
if (used > max) {
max = used;
}
try {
sleep(100);
} catch (InterruptedException E) {}
}
}
} /* end of class MemoryWatcherThread */
}