/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.test.jdbc;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Savepoint;
import java.sql.Statement;
import org.h2.constant.ErrorCode;
import org.h2.test.TestBase;
/**
* Tests Statement.cancel
*/
public class TestCancel extends TestBase {
private static int lastVisited;
/**
* Run just this test.
*
* @param a ignored
*/
public static void main(String... a) throws Exception {
TestBase.createCaller().init().test();
}
/**
* This thread cancels a statement after some time.
*/
static class CancelThread extends Thread {
private Statement cancel;
private int wait;
private volatile boolean stop;
CancelThread(Statement cancel, int wait) {
this.cancel = cancel;
this.wait = wait;
}
/**
* Stop the test now.
*/
public void stopNow() {
this.stop = true;
}
public void run() {
while (!stop) {
try {
Thread.sleep(wait);
cancel.cancel();
Thread.yield();
} catch (SQLException e) {
// ignore errors on closed statements
} catch (Exception e) {
TestBase.logError("sleep", e);
}
}
}
}
public void test() throws Exception {
testQueryTimeoutInTransaction();
testReset();
testMaxQueryTimeout();
testQueryTimeout();
testJdbcQueryTimeout();
testCancelStatement();
deleteDb("cancel");
}
private void testReset() throws SQLException {
deleteDb("cancel");
Connection conn = getConnection("cancel");
Statement stat = conn.createStatement();
stat.execute("set query_timeout 1");
assertThrows(ErrorCode.STATEMENT_WAS_CANCELED, stat).
execute("select count(*) from system_range(1, 1000000), system_range(1, 1000000)");
stat.execute("set query_timeout 0");
stat.execute("select count(*) from system_range(1, 1000), system_range(1, 1000)");
conn.close();
}
private void testQueryTimeoutInTransaction() throws SQLException {
deleteDb("cancel");
Connection conn = getConnection("cancel");
Statement stat = conn.createStatement();
stat.execute("CREATE TABLE TEST(ID INT)");
conn.setAutoCommit(false);
stat.execute("INSERT INTO TEST VALUES(1)");
Savepoint sp = conn.setSavepoint();
stat.execute("INSERT INTO TEST VALUES(2)");
stat.setQueryTimeout(1);
conn.rollback(sp);
conn.commit();
conn.close();
}
private void testJdbcQueryTimeout() throws SQLException {
deleteDb("cancel");
Connection conn = getConnection("cancel");
Statement stat = conn.createStatement();
assertEquals(0, stat.getQueryTimeout());
stat.setQueryTimeout(1);
assertEquals(1, stat.getQueryTimeout());
Statement s2 = conn.createStatement();
assertEquals(1, s2.getQueryTimeout());
ResultSet rs = s2.executeQuery("SELECT VALUE FROM INFORMATION_SCHEMA.SETTINGS WHERE NAME = 'QUERY_TIMEOUT'");
rs.next();
assertEquals(1000, rs.getInt(1));
assertThrows(ErrorCode.STATEMENT_WAS_CANCELED, stat).
executeQuery("SELECT MAX(RAND()) FROM SYSTEM_RANGE(1, 100000000)");
stat.setQueryTimeout(0);
stat.execute("SET QUERY_TIMEOUT 1100");
// explicit changes are not detected except, as documented
assertEquals(0, stat.getQueryTimeout());
conn.close();
}
private void testQueryTimeout() throws SQLException {
deleteDb("cancel");
Connection conn = getConnection("cancel");
Statement stat = conn.createStatement();
stat.execute("SET QUERY_TIMEOUT 10");
assertThrows(ErrorCode.STATEMENT_WAS_CANCELED, stat).
executeQuery("SELECT MAX(RAND()) FROM SYSTEM_RANGE(1, 100000000)");
conn.close();
}
private void testMaxQueryTimeout() throws SQLException {
deleteDb("cancel");
Connection conn = getConnection("cancel;MAX_QUERY_TIMEOUT=10");
Statement stat = conn.createStatement();
assertThrows(ErrorCode.STATEMENT_WAS_CANCELED, stat).
executeQuery("SELECT MAX(RAND()) FROM SYSTEM_RANGE(1, 100000000)");
conn.close();
}
/**
* This method is called via reflection from the database.
*
* @param x the value
* @return the value
*/
public static int visit(int x) {
lastVisited = x;
return x;
}
private void testCancelStatement() throws Exception {
deleteDb("cancel");
Connection conn = getConnection("cancel");
Statement stat = conn.createStatement();
stat.execute("DROP TABLE IF EXISTS TEST");
stat.execute("CREATE ALIAS VISIT FOR \"" + getClass().getName() + ".visit\"");
stat.execute("CREATE MEMORY TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR(255))");
PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST VALUES(?, ?)");
trace("insert");
int len = getSize(10, 1000);
for (int i = 0; i < len; i++) {
prep.setInt(1, i);
// prep.setString(2, "Test Value "+i);
prep.setString(2, "hi");
prep.execute();
}
trace("inserted");
// TODO test insert into ... select
for (int i = 1;;) {
Statement query = conn.createStatement();
CancelThread cancel = new CancelThread(query, i);
visit(0);
cancel.start();
Thread.yield();
assertThrows(ErrorCode.STATEMENT_WAS_CANCELED, query).
executeQuery("SELECT VISIT(ID), (SELECT SUM(X) " +
"FROM SYSTEM_RANGE(1, 10000) WHERE X<>ID) FROM TEST ORDER BY ID");
cancel.stopNow();
cancel.join();
if (lastVisited == 0) {
i += 10;
} else {
break;
}
}
conn.close();
}
}