checkpoint.java

derby database source code.good for you.

/*

   Derby - Class org.apache.derbyTesting.functionTests.tests.store.checkPoint

   Copyright 2003, 2005 The Apache Software Foundation or its licensors, as applicable.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

 */

package org.apache.derbyTesting.functionTests.tests.store;
import java.io.File;
import java.io.ByteArrayInputStream;

import java.math.BigDecimal;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import org.apache.derby.tools.ij;
import org.apache.derby.tools.JDBCDisplayUtil;

/**
 * Test to make sure checkpoint or occuring as expected.
 * Check is done by looking at the timestamp for "log.ctrl" file,
 * If modified time is more than what it was in the last lookup
 * means , we know that checkpoint occured.
 * Other thing that is counted is in this program is number of log switches.
 * @author suresht
 */

public class checkPoint
{
 
    public static void main( String args[])
    {
		System.out.println("Test checkpoint starting");
		
        try
        {
			// use the ij utility to read the property file and
			// make the initial connection.
			ij.getPropertyArg(args);
			Connection conn = ij.startJBMS();

			//open all the internal derby files involved in this test.
			setupAllTestFiles();

            Statement stmt = conn.createStatement();
			stmt.executeUpdate("CREATE PROCEDURE WAIT_FOR_POST_COMMIT() DYNAMIC RESULT SETS 0 LANGUAGE JAVA EXTERNAL NAME 'org.apache.derbyTesting.functionTests.util.T_Access.waitForPostCommitToFinish' PARAMETER STYLE JAVA");

            stmt.executeUpdate( "create table t1(" + 
								"c1 int not null primary key , c2 varchar(200) not null unique , c3 char(200) not null unique)");
            conn.setAutoCommit(true);
			String  ins_string = "insert into t1 values(?,?,?)";
			PreparedStatement insStmt = conn.prepareStatement(ins_string);
			//wait to make sure that checkpoint thread finished it's work
			stmt.executeUpdate("CALL SYSCS_UTIL.SYSCS_CHECKPOINT_DATABASE()");
			stmt.executeUpdate("call WAIT_FOR_POST_COMMIT()");
			checkpointOccured();
			boolean modifiedIntervals = false;
			for(int uniqueid =0 ; uniqueid < 3500 ; uniqueid++)
			{
				insStmt.setLong(1, uniqueid);
				insStmt.setString(2, "IBM GREAT COMPANY " + uniqueid);
				insStmt.setString(3, "IBM GREAT COMPANY " + uniqueid);
				insStmt.executeUpdate();
				
				//check every 300 rows inserted  how many log files
				//are there and whether a  checkpoint occured
				if((uniqueid % 400) == 0)
				{
					System.out.println("Checking logs and Checkpoint at Insert:"
									   + uniqueid);
					//wait to make sure that checkpoint thread finished it's work
					stmt.executeUpdate("call WAIT_FOR_POST_COMMIT()");
					checkpointOccured();
				}

				//change the checkpointInterval and LogInterval to equal values
				if(uniqueid > 2500 && !modifiedIntervals)
				{
					ResultSet rs;
					System.out.println("Modifying the checkpoint/log intervals");
					//modify the values.
					String value = "150001";
					stmt.executeUpdate("call SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY" +
									   "('derby.storage.logSwitchInterval', " +
									   "'" + value + "'"+ ")");
					stmt.executeUpdate("call SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY" +
									   "('derby.storage.checkpointInterval', " +
									   "'" + value + "'" + ")");
					rs	= 
						stmt.executeQuery("values SYSCS_UTIL.SYSCS_GET_DATABASE_PROPERTY" +
										  "('derby.storage.checkpointInterval')");
					while(rs.next()){
						System.out.println("checkPointInterval:" + rs.getString(1));
					}
					
					rs =stmt.executeQuery("values SYSCS_UTIL.SYSCS_GET_DATABASE_PROPERTY" +
										  "('derby.storage.logSwitchInterval')");
					while(rs.next()){
						System.out.println("logSwitchInterval:" + rs.getString(1));
					}

					modifiedIntervals = true;
				}
			}
			
			//print the number of the last log file
			//to make sure we are creating too many log files.
			numberOfLogFiles();
			conn.commit();
			stmt.close();
            insStmt.close();
            conn.close();
        }
        catch( SQLException e)
        {
			dumpSQLExceptions(e);
		} catch (Throwable e) {
			System.out.println("FAIL -- unexpected exception:" + e.toString());
		}

		//shutdown the database ..
		try{
			//shutdown 
			Connection conn = DriverManager.getConnection("jdbc:derby:wombat;shutdown=true");
		}catch(SQLException se){
				if (se.getSQLState() != null && se.getSQLState().equals("08006"))
					System.out.println("database shutdown properly\n");
				else
					dumpSQLExceptions(se);
		} catch (Throwable e) {
			System.out.println("FAIL -- unexpected exception:" + e.toString());
		}

		System.out.println("Test checkpoint finished");
    }

	
	static private void dumpSQLExceptions (SQLException se) {
		System.out.println("FAIL -- unexpected exception: " + se.toString());
		while (se != null) {
			System.out.print("SQLSTATE("+se.getSQLState()+"):");
			se = se.getNextException();
		}
	}



	//utility routines to trach number of log files
	//and checkpoints.
	private static String derbyHome;
	private static File dbDir ;
	private static File logDir;
	private static File logControlFile;
	private static long lastCheckPointTime = 0;

	private static void setupAllTestFiles()
	{
		derbyHome = System.getProperty("derby.system.home");
		dbDir = new File(derbyHome, "wombat");
		logDir = new File(dbDir , "log");
		logControlFile = new File(logDir , "log.ctrl");
		lastCheckPointTime = logControlFile.lastModified();
	}

	private static boolean checkpointOccured()
	{
		long currentModifiedTime = logControlFile.lastModified();
		if(currentModifiedTime > lastCheckPointTime)
		{
			lastCheckPointTime = currentModifiedTime ;
			System.out.println("CHECKPOINT WAS DONE");
			return true;
		}
		
		return false;
	}


	private static int numberOfLogFiles()
	{
		//find out how many log files are in logDir
		//-2 (control files log.ctrl, logmirror.ctrl)
		File[] logFiles = logDir.listFiles();
		int noFiles = (logFiles == null) ? 0 : logFiles.length;
		String lastLogFile ="";
		for(int i = 0 ; i < noFiles ; i++)
		{
			String current = logFiles[i].getName() ;
			if(current.compareTo("log.ctrl")==0 || current.compareTo("logmirror.ctrl")==0)
				continue;
			if(current.compareTo(lastLogFile) > 0)
				lastLogFile = current;
		}

		if(lastLogFile.compareTo("log21.dat") > 0)
		{
			System.out.println("There seems to be too many log files");
			System.out.println(lastLogFile);
		}
		logFiles = null;
		return noFiles -2 ;


	}
    
}