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// Portions Copyright [2019-2021] [Payara Foundation and/or its affiliates]
package com.sun.enterprise.connectors.util;
import com.sun.enterprise.connectors.ConnectorRuntime;
import com.sun.logging.LogDomains;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ConnectorTimerProxy extends Timer {
private volatile static ConnectorTimerProxy connectorTimer;
private Timer timer;
private boolean timerException = false;
private final Object getTimerLock = new Object();
private final static Logger _logger = LogDomains.getLogger(ConnectorTimerProxy.class,
LogDomains.RSR_LOGGER);
private ConnectorTimerProxy(boolean isDaemon) {
super(isDaemon);
}
private Timer getTimer() {
synchronized (getTimerLock) {
if (timer == null || timerException) {
ClassLoader loader = null;
try {
loader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(
ConnectorRuntime.getRuntime().getConnectorClassLoader());
timer = AccessController.doPrivileged((PrivilegedAction) () ->
new Timer("connector-timer-proxy", true));
} finally {
Thread.currentThread().setContextClassLoader(loader);
timerException = false;
}
}
}
return timer;
}
public static final ConnectorTimerProxy getProxy() {
if(connectorTimer == null) {
synchronized (ConnectorTimerProxy.class) {
if (connectorTimer == null) {
connectorTimer = new ConnectorTimerProxy(true);
}
}
}
return connectorTimer;
}
/**
* Proxy method to schedule a timer task at fixed rate.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void scheduleAtFixedRate(TimerTask task, long delay, long period) {
timer = getTimer();
try {
timer.scheduleAtFixedRate(task, delay, period);
} catch(Exception ex) {
handleTimerException(ex);
timer.scheduleAtFixedRate(task, delay, period);
}
}
@Override
public void cancel() {
timer = getTimer();
try {
timer.cancel();
} catch(Exception ex) {
_logger.log(Level.WARNING, "exception_cancelling_timer", ex.getMessage());
}
}
@Override
public int purge() {
int status = 0;
timer = getTimer();
try {
status = timer.purge();
} catch(Exception ex) {
_logger.log(Level.WARNING, "exception_purging_timer", ex.getMessage());
}
return status;
}
/**
* Proxy method to schedule a timer task after a specified delay.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void schedule(TimerTask task, long delay) {
timer = getTimer();
try {
timer.schedule(task, delay);
} catch(Exception ex) {
handleTimerException(ex);
timer.schedule(task, delay);
}
}
/**
* Proxy method to schedule a timer task at the specified time.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void schedule(TimerTask task, Date time) {
timer = getTimer();
try {
timer.schedule(task, time);
} catch(Exception ex) {
handleTimerException(ex);
timer.schedule(task, time);
}
}
/**
* Proxy method to schedule a timer task for repeated fixed-delay execution,
* beginning after the specified delay.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void schedule(TimerTask task, long delay, long period) {
timer = getTimer();
try {
timer.schedule(task, delay, period);
} catch(Exception ex) {
handleTimerException(ex);
timer.schedule(task, delay, period);
}
}
/**
* Proxy method to schedule a timer task for repeated fixed-delay execution,
* beginning after the specified delay.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void schedule(TimerTask task, Date firstTime, long period) {
timer = getTimer();
try {
timer.schedule(task, firstTime, period);
} catch(Exception ex) {
handleTimerException(ex);
timer.schedule(task, firstTime, period);
}
}
/**
* Proxy method to schedule a timer task for repeated fixed-rate execution,
* beginning after the specified delay.
* The unchecked exceptions are caught here and in such cases, the timer
* is recreated and task is rescheduled.
* @param task
* @param delay
* @param period
*/
@Override
public void scheduleAtFixedRate(TimerTask task, Date firstTime, long period) {
timer = getTimer();
try {
timer.scheduleAtFixedRate(task, firstTime, period);
} catch(Exception ex) {
handleTimerException(ex);
timer.scheduleAtFixedRate(task, firstTime, period);
}
}
/**
* Handle any exception occured during scheduling timer.
*
* In case of unchecked exceptions, the timer is recreated to be used
* by the subsequent requests for scheduling.
* @param ex exception that was caught
*/
private void handleTimerException(Exception ex) {
_logger.log(Level.WARNING, "exception_scheduling_timer", ex.getMessage());
//In case of unchecked exceptions, timer needs to recreated.
_logger.info("Recreating Timer and scheduling at fixed rate");
timerException = true;
timer = getTimer();
}
}
