private static void monitor() {
long nowInMillis;
long dailyTimeStampInMillis;
init();
String subject = "HTTP Uptime monitor started: " + remoteHost + ".";
String message = "Monitoring from " + Server.getHostName() + Names.NEW_LINE;
message += "URL: " + url + Names.NEW_LINE;
message += "remote host: " + remoteHost + Names.NEW_LINE;
message += "local down command:" + downCommand + " " + remoteHost + Names.NEW_LINE;
message += "local up command:" + upCommand + " " + remoteHost + Names.NEW_LINE;
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception e) {
e.printStackTrace();
}
dailyTimeStamp = getToday();
dailyTimeStampInMillis = dailyTimeStamp.getTimeInMillis();
int year, month, day;
year = dailyTimeStamp.get(Calendar.YEAR);
month = dailyTimeStamp.get(Calendar.MONTH);
day = dailyTimeStamp.get(Calendar.DAY_OF_MONTH);
dailyTimeStamp = new GregorianCalendar(year, month, day, 5, 0, 0);
Calendar currentTimeStamp;
int i = 0;
while (true) {
i++;
try {
int code = getResponseCode();
for (int x = 0; x < (i % 8); x++) System.out.print(".");
{
} // System.out.println("Http Response=" + HTTPCodes[code] + "[" +code + "] for " + url);
if (code < 200 || code > 204) restartServer(code);
} catch (Exception e) {
e.printStackTrace();
restartServer(601);
}
Sleep.sleep(POLLING_INTERVAL * 1000);
currentTimeStamp = new GregorianCalendar();
nowInMillis = currentTimeStamp.getTimeInMillis();
if (nowInMillis > (dailyTimeStampInMillis + (1000 * 60 * 60 * 24))) {
dailyTimeStamp = getToday();
dailyTimeStampInMillis = dailyTimeStamp.getTimeInMillis();
subject = "HTTP Uptime monitor running: " + remoteHost + ".";
message = "Monitoring from " + Server.getHostName() + Names.NEW_LINE;
message += "URL: " + url + Names.NEW_LINE;
message += "remote host: " + remoteHost + Names.NEW_LINE;
message += "local down command:" + downCommand + " " + remoteHost + Names.NEW_LINE;
message += "local up command:" + upCommand + " " + remoteHost + Names.NEW_LINE;
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
private static void restartServer(int err) {
String subject = "Restarting Server: " + remoteHost + " [" + err + "]!!";
String message = "Description of last Response:" + Names.NEW_LINE;
message += "URL: " + url + Names.NEW_LINE;
message += "Response: " + HTTPCodes[err] + "[" + err + "]" + Names.NEW_LINE;
message += "Attempting to restart server: " + remoteHost + Names.NEW_LINE;
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception e) {
e.printStackTrace();
}
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
{
} // System.out.println("Attempting restart server: " + remoteHost);
ExecShell down = new ExecShell();
down.setExecutable(downCommand);
down.addCommandLineArgument(remoteHost, false);
try {
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
{
} // System.out.println("Bringing server down on " + remoteHost + " with " + downCommand);
down.execute();
down.waitFor();
Sleep.sleep(SERVER_SHUTDOWN_DURATION * 1000);
} catch (Exception e) {
subject = "ERROR Restarting Server on " + remoteHost;
message = "Could not execute bring down command: " + downCommand + Names.NEW_LINE;
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception ex) {
ex.printStackTrace();
}
{
} // System.out.println("Could not execute bring down command: " + downCommand);
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}
ExecShell up = new ExecShell();
up.setExecutable(upCommand);
up.addCommandLineArgument(remoteHost, false);
try {
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
{
} // System.out.println("Bringing server up on " + remoteHost + " with " + upCommand);
up.execute();
up.waitFor();
Sleep.sleep(SERVER_STARTUP_DURATION * 1000);
int code = getResponseCode();
if (code > 199 && code < 206) {
subject = "Server is back up: " + remoteHost + "[" + code + "].";
message = "Http Response=" + HTTPCodes[code] + "[" + code + "] for " + url;
{
} // System.out.println(subject);
{
} // System.out.println(message);
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception ex) {
ex.printStackTrace();
}
} else {
subject = "Could not bring server back up" + " [" + code + "]!";
message = "Http Response=" + HTTPCodes[code] + "[" + code + "] for " + url;
{
} // System.out.println(subject);
{
} // System.out.println(message);
EMail.send(FROM, mailTo, subject, message, smtpHost);
}
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
} catch (Exception e) {
subject = "ERROR Restarting Server on " + remoteHost;
message = "Could not execute bring up command: " + upCommand;
{
} // System.out.println(subject);
{
} // System.out.println(message);
{
} // System.out.println("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
try {
EMail.send(FROM, mailTo, subject, message, smtpHost);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}