org.javasimon.examples.jmx.MonitoredApplication Maven / Gradle / Ivy
package org.javasimon.examples.jmx;
import org.javasimon.SimonManager;
import org.javasimon.Split;
import org.javasimon.jmx.SimonManagerMXBeanImpl;
import org.javasimon.utils.SimonUtils;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.JMException;
import java.util.Random;
import java.sql.*;
import java.io.IOException;
import java.lang.management.ManagementFactory;
/**
* Application that can be monitored through JMX.
* TODO: rework and make it work with MonitoringClient somehow
*
* @author Radovan Sninsky
* @since 2.0
*/
public class MonitoredApplication {
private final Random rand = new Random();
/**
* Creates in-memory database db1 and table foo through original H2 driver.
*
* @throws java.sql.SQLException if something goes wrong
*/
protected void setUp() throws SQLException {
Connection c = null;
try {
c = DriverManager.getConnection("jdbc:h2:mem:db1;DB_CLOSE_DELAY=-1");
Statement stmt = c.createStatement();
stmt.execute("create table foo (id number(6), dsc varchar2(256))");
stmt.close();
} finally {
if (c != null) {
c.close();
}
}
}
/**
* Executes prepared insert into table foo.
*
* @param c connection to DB
* @throws SQLException if something goes wrong
*/
protected final void doInsert(Connection c) throws SQLException {
PreparedStatement stmt = null;
try {
stmt = c.prepareStatement("insert into foo values (?, ?) ");
stmt.setInt(1, rand.nextInt(99999));
stmt.setString(2, "This is a text");
stmt.executeUpdate();
} finally {
if (stmt != null) {
stmt.close();
}
}
}
/**
* Executes select all records from table foo.
*
* @param c connection to DB
* @return record count
* @throws SQLException if something goes wrong
*/
protected final int doSelect(Connection c) throws SQLException {
Statement stmt = null;
ResultSet rs = null;
try {
stmt = c.createStatement();
rs = stmt.executeQuery("select * from foo");
int count = 0;
while (rs.next()) {
count++;
}
return count;
} finally {
if (rs != null) {
rs.close();
}
if (stmt != null) {
stmt.close();
}
}
}
private static SimonManagerMXBeanImpl register() {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
try {
ObjectName name = new ObjectName("org.javasimon.jmx.example:type=Simon");
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
}
SimonManagerMXBeanImpl simon = new SimonManagerMXBeanImpl(SimonManager.manager());
mbs.registerMBean(simon, name);
System.out.println("SimonManagerMXBean registerd under name: "+name);
return simon;
} catch (JMException e) {
System.out.println("SimonManagerMXBean registration failed!\n"+e);
}
return null;
}
private static void unregister() {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
try {
ObjectName name = new ObjectName("org.javasimon.jmx.example:type=Simon");
if (mbs.isRegistered(name)) {
mbs.unregisterMBean(name);
}
System.out.println("SimonManagerMXBean was unregisterd");
} catch (JMException e) {
System.out.println("SimonManagerMXBean unregistration failed!\n"+e);
}
}
private static void waitForEnterPressed() {
try {
System.out.println("\nPress to continue...");
//noinspection ResultOfMethodCallIgnored
System.in.read();
} catch (IOException e) { /* do nothing */ }
}
/**
* Entry point of the example application.
*
* @param args command line arguments
* @throws Exception sometimes bad things can happen
*/
public static void main(String[] args) throws Exception {
Split main = SimonManager.getStopwatch("org.javasimon.examples.jmx.main").start();
Class.forName("org.h2.Driver");
Class.forName("org.javasimon.jdbc4.Driver");
MonitoredApplication s = new MonitoredApplication();
s.setUp();
Connection conn = null;
try {
conn = DriverManager.getConnection("jdbc:simon:h2:mem:db1");
Split ops = SimonManager.getStopwatch("org.javasimon.examples.jmx.sql").start();
s.doInsert(conn);
s.doSelect(conn);
ops.stop();
} finally {
if (conn != null) {
conn.close();
}
}
main.stop();
System.out.println("Simon monitor hierarchy:\n" + SimonUtils.simonTreeString(SimonManager.getRootSimon()));
register();
waitForEnterPressed();
unregister();
}
}