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annotate tests/Test_Cforkbomb.java @ 973:32f246853ec4 default tip

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Optimisation, call connection.mapClobAsVarChar() and connection.mapBlobAsVarBinary() outside the for-loop, as it does not change.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 10 Apr 2025 19:26:59 +0200 (3 hours ago)
parents d416e9b6b3d0
children
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1 /*
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2 * SPDX-License-Identifier: MPL-2.0
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 *
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8 * Copyright 2024, 2025 MonetDB Foundation;
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9 * Copyright August 2008 - 2023 MonetDB B.V.;
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10 * Copyright 1997 - July 2008 CWI.
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11 */
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12
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13 import java.sql.*;
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14 import java.util.*;
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15
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16 public class Test_Cforkbomb {
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17 private static String args[];
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18
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19 static class Worker extends Thread {
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20 private int id;
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21
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22 public Worker(int id) {
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23 this.id = id;
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24 }
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25
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26 public void run() {
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27 try {
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28 System.out.print("Establishing Connection " + id + "...");
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29 Connection con = DriverManager.getConnection(args[0]);
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30 System.out.println(" done...");
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31
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32 // do something with the connection to test if it works
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33 Statement stmt = con.createStatement();
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34 ResultSet rs = stmt.executeQuery("SELECT " + id);
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35 if (!rs.next()) {
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36 System.out.println("thread " + id + " got no response from server :(");
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37 } else {
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38 if (rs.getInt(1) == id) {
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39 System.out.println("thread " + id + ": connection ok");
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40 } else {
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41 System.out.println("thread " + id + ": got garbage: " + rs.getString(1));
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42 }
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43 }
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44
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45 con.close();
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46 } catch (SQLException e) {
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47 System.out.println("thread " + id + " unhappy: " + e.toString());
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48 }
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49 }
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50 }
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51
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52 public static void main(String[] args) throws Exception {
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53 Test_Cforkbomb.args = args;
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54
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55 // just DoS the server full throttle :)
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56 int i;
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57 for (i = 0; i < 200; i++) {
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58 Worker w = new Worker(i);
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59 w.start();
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60 }
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61 }
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62 }