public final class ServletTimerImpl implements ServletTimer, Runnable {
private static final Logger LOG =
OSGiLogger.getLogger(ServletTimer.class, BundleLogger.getStaticLogger());
private static final int UUID_LENGTH = 40;
private RunnableTimerTask timerTask;
private final ApplicationSessionImpl appSession;
private final String id;
private final Serializable info;
private final boolean repeatingTimer;
private long scheduledExecutionTime;
private long delay;
private long period;
private long numInvocations;
private boolean fixedDelay;
private long firstExecution;
private TimerListener listener;
/**
* Constructor for non-repeating timer.
*
* @param info Information about the timer
* @param delay Delay until execution
* @param listener Listener that will get timeout events.
*/
public ServletTimerImpl(
Serializable info, long delay, TimerListener listener, ApplicationSessionImpl appSession) {
this(info, delay, false, 0, listener, appSession);
}
/**
* Constructor for repeating times
*
* @param info Information about the timer
* @param delay Delay until first execution
* @param fixedDelay Whether fixed delay mode should be used
* @param period Period between execution
* @param listener Listener that will get timeout events.
*/
public ServletTimerImpl(
Serializable info,
long delay,
boolean fixedDelay,
long period,
TimerListener listener,
ApplicationSessionImpl appSession) {
this.id = UUID.randomUUID(UUID_LENGTH);
this.info = info;
this.delay = delay;
this.scheduledExecutionTime = delay + System.currentTimeMillis();
this.fixedDelay = fixedDelay;
this.period = period;
this.listener = listener;
this.appSession = appSession;
this.numInvocations = 0;
this.firstExecution = 0;
this.repeatingTimer = (period > 0);
this.timerTask = new RunnableTimerTask(this);
}
public void cancel() {
LOG.debug("removeServletTimer");
appSession.removeServletTimer(this);
LOG.debug("cancel timerTask");
timerTask.cancel();
}
public ApplicationSession getApplicationSession() {
return appSession;
}
public String getId() {
return id;
}
public Serializable getInfo() {
return info;
}
public synchronized long getTimeRemaining() {
return scheduledExecutionTime - System.currentTimeMillis();
}
public synchronized long scheduledExecutionTime() {
return this.scheduledExecutionTime;
}
public RunnableTimerTask getServletTimerTask() {
return timerTask;
}
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("Info = ")
.append(info)
.append(System.getProperty("line.separator"))
.append("Scheduled execution time = ");
synchronized (this) {
sb.append(scheduledExecutionTime);
}
sb.append(System.getProperty("line.separator"));
sb.append("Time now = ")
.append(System.currentTimeMillis())
.append(System.getProperty("line.separator"));
sb.append("ApplicationSession = ")
.append(appSession)
.append(System.getProperty("line.separator"));
sb.append("Delay = ").append(delay).append(System.getProperty("line.separator"));
return sb.toString();
}
/** Helper to calculate when next execution time is. */
private synchronized void estimateNextExecution() {
if (fixedDelay) {
scheduledExecutionTime = period + System.currentTimeMillis();
} else {
if (firstExecution == 0) {
// save timestamp of first execution
firstExecution = scheduledExecutionTime;
}
long now = System.currentTimeMillis();
long executedTime = (numInvocations * period);
numInvocations++;
scheduledExecutionTime = firstExecution + executedTime;
if (LOG.isDebugEnabled()) {
LOG.debug("next execution estimated to run at " + scheduledExecutionTime);
LOG.debug("current time is " + now);
}
}
}
public void run() {
long run = System.currentTimeMillis();
// PORTAGE chgt de classLoader pour le currentThread
// ClassLoader oldClassLoader = Thread.currentThread().getContextClassLoader();
try {
// ClassLoader cl = listener.getClass().getClassLoader();
// Thread.currentThread().setContextClassLoader(cl);
LOG.debug("Call timeout");
listener.timeout(this);
} catch (Throwable e) {
LOG.error("An unexpected exception happened in the timer callback", e);
} finally {
// Thread.currentThread().setContextClassLoader(oldClassLoader);
if (repeatingTimer) {
LOG.debug("Reset repeating servlet timer");
estimateNextExecution();
} else {
LOG.debug("Cancel servlet timer");
// this non-repeating timer is now "ready"
// and should not be included in the list of active timers
// The application may already have canceled() the timer though
cancel(); // dont bother about return value....
}
}
run = System.currentTimeMillis() - run;
if (run > 500) {
LOG.error(
appSession.getId()
+ ": The servlet timer has taken more than 500 ms to be handled: "
+ run
+ " ms");
}
}
}
public final class TimerServiceImpl extends Timer implements TimerService {
private static final Logger LOG =
OSGiLogger.getLogger(TimerService.class, BundleLogger.getStaticLogger());
public ServletTimer createTimer(
ServletContext context, long delay, boolean isPersistent, Serializable info) {
throw new UnsupportedOperationException();
}
public ServletTimer createTimer(
ServletContext context,
long delay,
long period,
boolean fixedDelay,
boolean isPersistent,
Serializable info) {
throw new UnsupportedOperationException();
}
public ServletTimer createTimer(
ApplicationSession appSession, long delay, boolean isPersistent, Serializable info) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Create timer for application "
+ appSession.getApplicationName()
+ " (delay="
+ delay
+ ", persistent="
+ isPersistent
+ ")");
}
ApplicationSessionImpl applicationSessionImpl = (ApplicationSessionImpl) appSession;
applicationSessionImpl.checkValid();
if (!applicationSessionImpl.hasTimerListener()) {
throw new IllegalStateException(
"No Timer listeners have been configured for this application ");
}
TimerListener listener = applicationSessionImpl.getServletContextInternal().getTimerListener();
ServletTimerImpl servletTimer =
createTimerLocally(listener, delay, isPersistent, info, applicationSessionImpl);
return servletTimer;
}
public ServletTimer createTimer(
ApplicationSession appSession,
long delay,
long period,
boolean fixedDelay,
boolean isPersistent,
Serializable info) {
if (period < 1) {
throw new IllegalArgumentException("Period should be greater than 0");
}
if (LOG.isDebugEnabled()) {
LOG.debug(
"Create timer for application "
+ appSession.getApplicationName()
+ " (delay="
+ delay
+ ", period="
+ period
+ ", fixedDelay="
+ fixedDelay
+ ", persistent="
+ isPersistent
+ ")");
}
ApplicationSessionImpl applicationSessionImpl = (ApplicationSessionImpl) appSession;
applicationSessionImpl.checkValid();
if (applicationSessionImpl.getServletContextInternal().getTimerListener() == null) {
throw new IllegalStateException(
"No Timer listeners have been configured for this application ");
}
TimerListener timerListener =
applicationSessionImpl.getServletContextInternal().getTimerListener();
ServletTimerImpl servletTimer =
createTimerLocally(
timerListener, delay, period, fixedDelay, isPersistent, info, applicationSessionImpl);
return servletTimer;
}
/**
* @param listener
* @param delay
* @param isPersistent
* @param info
* @param applicationSession
* @return
*/
private ServletTimerImpl createTimerLocally(
TimerListener listener,
long delay,
boolean isPersistent,
Serializable info,
ApplicationSessionImpl applicationSession) {
ServletTimerImpl servletTimer = new ServletTimerImpl(info, delay, listener, applicationSession);
super.schedule(servletTimer.getServletTimerTask(), delay);
applicationSession.addServletTimer(servletTimer);
if (isPersistent) {
persist(servletTimer);
}
return servletTimer;
}
/**
* @param listener
* @param delay
* @param period
* @param fixedDelay
* @param isPersistent
* @param info
* @param applicationSession
* @return
*/
private ServletTimerImpl createTimerLocally(
TimerListener listener,
long delay,
long period,
boolean fixedDelay,
boolean isPersistent,
Serializable info,
ApplicationSessionImpl applicationSession) {
final ServletTimerImpl servletTimer =
new ServletTimerImpl(info, delay, fixedDelay, period, listener, applicationSession);
if (fixedDelay) {
super.schedule(servletTimer.getServletTimerTask(), delay, period);
} else {
super.scheduleAtFixedRate(servletTimer.getServletTimerTask(), delay, period);
}
applicationSession.addServletTimer(servletTimer);
if (isPersistent) {
persist(servletTimer);
}
return servletTimer;
}
/** @param st */
private void persist(ServletTimerImpl st) {
// TODO - implement persistance
}
public void stop() {
super.cancel();
if (LOG.isDebugEnabled()) {
LOG.debug("Stopped timer service " + this);
}
}
public void start() {
if (LOG.isDebugEnabled()) {
LOG.debug("Started timer service " + this);
}
}
}
