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package com.sun.ejb.containers;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.sun.logging.LogDomains;
import java.io.Serializable;
import java.util.Date;
import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.Application;
/**
* RuntimeTimerState holds all runtime state of an EJB
* timer, including what fine-grained state it's in,
* stats about the number of expirations and failed
* deliveries that have occurred, and any existing JDK
* timer task that is currently scheduled for this timer.
* It also caches read-only state of a timer to improve
* performance.
*
* @author Kenneth Saks
*/
class RuntimeTimerState {
private static final Logger logger =
LogDomains.getLogger(LogDomains.EJB_LOGGER);
//
// Fine-grained timer states
//
// Timer has been created but not committed.
private static final int CREATED = 0;
// There is a scheduled JDK timer task for this timer.
private static final int SCHEDULED = 1;
// The JDK timer task has expired and the timer's ejbTimeout method
// is being called.
private static final int BEING_DELIVERED = 2;
// The timer has been cancelled but the cancellation can still be
// rolled back.
private static final int CANCELLED = 3;
private int state_;
//
// Immutable timer state.
//
private TimerPrimaryKey timerId_;
private Date initialExpiration_;
private long intervalDuration_;
private long containerId_;
private Object timedObjectPrimaryKey_;
//
private BaseContainer container_;
// Handle to scheduled timer task. This is only set when timer is SCHEDULED
private EJBTimerTask currentTask_;
//
// stats
//
private int numExpirations_;
private int numFailedDeliveries_;
RuntimeTimerState(TimerPrimaryKey timerId,
Date initialExpiration, long intervalDuration,
BaseContainer container,
Object timedObjectPkey) {
state_ = CREATED;
currentTask_ = null;
timerId_ = timerId;
initialExpiration_ = initialExpiration;
intervalDuration_ = intervalDuration;
timedObjectPrimaryKey_ = timedObjectPkey;
container_ = container;
containerId_ = container.getContainerId();
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "RuntimeTimerState " + timerId_ +
" created");
}
}
TimerPrimaryKey getTimerId() {
return timerId_;
}
Date getInitialExpiration() {
return initialExpiration_;
}
BaseContainer getContainer() {
return container_;
}
long getContainerId() {
return containerId_;
}
Object getTimedObjectPrimaryKey() {
return timedObjectPrimaryKey_;
}
long getIntervalDuration() {
return intervalDuration_;
}
//
// Operations for performing state transitions.
//
void scheduled(EJBTimerTask timerTask) {
if( logger.isLoggable(Level.FINER) ) {
printStateTransition(state_, SCHEDULED);
}
currentTask_ = timerTask;
state_ = SCHEDULED;
numFailedDeliveries_ = 0;
}
void rescheduled(EJBTimerTask timerTask) {
if( logger.isLoggable(Level.FINER) ) {
printStateTransition(state_, SCHEDULED);
}
currentTask_ = timerTask;
state_ = SCHEDULED;
numFailedDeliveries_++;
}
/**
* Transition from CANCELLED to DELIVERED when ejbTimeout calls
* cancel and then rolls back. Don't reset numFailedDeliveries.
*/
void restoredToDelivered() {
if( logger.isLoggable(Level.FINER) ) {
printStateTransition(state_, BEING_DELIVERED);
}
currentTask_ = null;
state_ = BEING_DELIVERED;
}
void delivered() {
if( logger.isLoggable(Level.FINER) ) {
printStateTransition(state_, BEING_DELIVERED);
}
currentTask_ = null;
if( numFailedDeliveries_ == 0 ) {
numExpirations_++;
}
state_ = BEING_DELIVERED;
}
void cancelled() {
if( logger.isLoggable(Level.FINER) ) {
printStateTransition(state_, CANCELLED);
}
currentTask_ = null;
state_ = CANCELLED;
}
String stateToString() {
return stateToString(state_);
}
private String stateToString(int state) {
switch(state) {
case CREATED :
return "CREATED";
case SCHEDULED :
return "SCHEDULED";
case BEING_DELIVERED :
return "BEING_DELIVERED";
case CANCELLED :
return "CANCELLED";
}
return state + " NOT FOUND";
}
private void printStateTransition(int fromState, int toState) {
logger.log(Level.FINER, timerId_ + ": " + stateToString(fromState) +
" to " + stateToString(toState));
}
int getNumExpirations() {
return numExpirations_;
}
/**
* Number of failed deliveries since timer last transitioned to
* the SCHEDULED state.
*/
int getNumFailedDeliveries() {
return numFailedDeliveries_;
}
EJBTimerTask getCurrentTimerTask() {
return currentTask_;
}
String getTimedObjectEjbName() {
return container_.getEjbDescriptor().getName();
}
String getTimedObjectApplicationName() {
EjbDescriptor ejbDesc = container_.getEjbDescriptor();
Application app = ejbDesc.getApplication();
return (app != null) ? app.getRegistrationName() : "";
}
boolean timedObjectIsEntity() {
return (timedObjectPrimaryKey_ != null);
}
//
// State-testing accessors.
//
boolean isActive() {
return (state_ != CANCELLED);
}
boolean isCancelled() {
return (state_ == CANCELLED);
}
boolean isCreated() {
return (state_ == CREATED);
}
boolean isBeingDelivered() {
return (state_ == BEING_DELIVERED);
}
boolean isScheduled() {
return (state_ == SCHEDULED);
}
boolean isRescheduled() {
return (isScheduled() && (numFailedDeliveries_ > 0));
}
Date getNextTimeout() {
if( !isScheduled() && !isRescheduled() ) {
throw new IllegalStateException();
}
return currentTask_.getTimeout();
}
long getTimeRemaining() {
Date timeout = getNextTimeout();
Date now = new Date();
return (timeout.getTime() - now.getTime());
}
/**
* @return true if interval timer and false otherwise
*/
boolean isPeriodic() {
return (intervalDuration_ > 0);
}
//
// java.lang.Object methods.
//
public int hashCode() {
return timerId_.hashCode();
}
public boolean equals(Object other) {
boolean equal = false;
if( other instanceof RuntimeTimerState ) {
equal = timerId_.equals(((RuntimeTimerState) other).timerId_);
}
return equal;
}
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append("'" + getTimerId() + "' ");
buffer.append("'TimedObject = " + getTimedObjectEjbName() + "' ");
buffer.append("'Application = " + getTimedObjectApplicationName()
+ "' ");
buffer.append("'" + stateToString() + "' ");
buffer.append("'" + (isPeriodic() ? "PERIODIC' " : "SINGLE-ACTION' "));
buffer.append("'Container ID = " + containerId_ + "' ");
buffer.append("'" + getInitialExpiration() + "' ");
buffer.append("'" + getIntervalDuration() + "' ");
Object pk = getTimedObjectPrimaryKey();
if( pk != null ) {
buffer.append("'" + pk + "' ");
}
return buffer.toString();
}
}
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