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package com.sun.ejb.containers;
import java.util.Date;
import java.io.Serializable;
import javax.ejb.EJBLocalObject;
import javax.ejb.NoSuchObjectLocalException;
import javax.ejb.EJBException;
import javax.ejb.Timer;
import javax.ejb.TimerHandle;
import javax.ejb.EJBException;
import javax.ejb.FinderException;
import com.sun.enterprise.Switch;
import com.sun.enterprise.InvocationManager;
import com.sun.enterprise.InvocationException;
import com.sun.enterprise.ComponentInvocation;
import com.sun.ejb.Invocation;
import com.sun.ejb.ComponentContext;
import java.io.IOException;
import com.sun.ejb.spi.io.IndirectlySerializable;
import com.sun.ejb.spi.io.SerializableObjectFactory;
/*
* TimerWrapper is the application-level representation
* of a timer. Note that this class is not Serializable.
* Timer instances are not intended to be directly persisted
* by the application. TimerHandle should be used instead.
*
* @author Kenneth Saks
*/
public class TimerWrapper
implements Timer, IndirectlySerializable
{
private TimerPrimaryKey timerId_;
private EJBTimerService timerService_;
TimerWrapper(TimerPrimaryKey timerId, EJBTimerService timerService) {
timerId_ = timerId;
timerService_ = timerService; //TimerService passed in could be null
}
/*
* Implementations of javax.ejb.Timer methods
*/
public void cancel()
throws IllegalStateException, NoSuchObjectLocalException, EJBException {
checkCallPermission();
try {
timerService_.cancelTimer(timerId_);
} catch(FinderException fe) {
throw new NoSuchObjectLocalException("timer no longer exists", fe);
} catch(Exception e) {
throw new EJBException(e);
}
}
public long getTimeRemaining()
throws IllegalStateException, NoSuchObjectLocalException {
Date nextTimeout = getNextTimeout();
Date now = new Date();
long timeRemaining = nextTimeout.getTime() - now.getTime();
return (timeRemaining > 0) ? timeRemaining : 0;
}
public Date getNextTimeout()
throws IllegalStateException, NoSuchObjectLocalException {
checkCallPermission();
Date nextTimeout;
try {
nextTimeout = timerService_.getNextTimeout(timerId_);
} catch(FinderException fe) {
throw new NoSuchObjectLocalException("timer no longer exists", fe);
}
return nextTimeout;
}
public Serializable getInfo()
throws IllegalStateException, NoSuchObjectLocalException {
checkCallPermission();
Serializable info;
try {
info = timerService_.getInfo(timerId_);
} catch(FinderException fe) {
throw new NoSuchObjectLocalException("timer no longer exists", fe);
}
return info;
}
public TimerHandle getHandle()
throws IllegalStateException, NoSuchObjectLocalException {
checkCallPermission();
if( !timerService_.timerExists(timerId_) ) {
throw new NoSuchObjectLocalException("timer no longer exists");
}
return new TimerHandleImpl(timerId_);
}
public boolean equals(Object o) {
boolean equal = false;
if(o instanceof TimerWrapper) {
TimerWrapper other = (TimerWrapper) o;
equal = other.timerId_.equals(this.timerId_);
}
return equal;
}
public int hashCode() {
return timerId_.hashCode();
}
public String toString() {
return "Timer " + timerId_;
}
/**
* Verify that Timer method access is allowed from this context.
* This method is static so that TimerHandle can call it even
* before it has created a TimerWrapper instance.
*/
private static void checkCallPermission() throws IllegalStateException {
boolean allowed = false;
ContainerFactoryImpl cf = (ContainerFactoryImpl)
Switch.getSwitch().getContainerFactory();
EJBTimerService timerService = cf.getEJBTimerService();
if( timerService == null ) {
throw new IllegalStateException
("EJBTimerService is not available");
}
try {
InvocationManager invManager =
Switch.getSwitch().getInvocationManager();
ComponentInvocation inv = invManager.getCurrentInvocation();
if (inv == null)
throw new IllegalStateException
("Invocation cannot be null");
int invType = inv.getInvocationType();
if( invType == ComponentInvocation.EJB_INVOCATION ) {
if ( inv instanceof Invocation ) {
ComponentContext context = ((Invocation) inv).context;
// Delegate check to EJB context. Let any
// IllegalStateException bubble up.
context.checkTimerServiceMethodAccess();
allowed = true;
} else {
// NOTE : There shouldn't be any cases where an EJB
// container uses com.sun.enterprise.ComponentInvocation
// instead of com.sun.ejb.Invocation and timer method
// access is allowed. No EJBContextImpl is available
// to perform checks.
allowed = false;
}
} else if( invType == ComponentInvocation.SERVLET_INVOCATION ) {
throw new IllegalStateException
("Web tier access to EJB timers through local " +
"interfaces is not portable");
}
} catch(InvocationException ie) {
IllegalStateException ise = new IllegalStateException
("Operation not allowed");
ise.initCause(ie);
throw ise;
}
if( !allowed ) {
throw new IllegalStateException("Operation not allowed");
}
}
public SerializableObjectFactory getSerializableObjectFactory() {
return new SerializedTimerWrapper(timerId_);
}
/**
* Used by serialization code to serialize a TimerWrapper. We
* need a separate type that TimerHandle so that on deserialization
* we know it started as a TimerWrapper instead of a TimerHandle.
*/
public static class SerializedTimerWrapper
implements SerializableObjectFactory
{
private TimerPrimaryKey timerId_;
SerializedTimerWrapper() {}
SerializedTimerWrapper(TimerPrimaryKey timerId) {
timerId_ = timerId;
}
/**
* When deserializing the timer wrapper create a TimerWrapper object.
* Check if the record is valid only when making calls on the object.
*/
public Object createObject()
throws EJBException
{
ContainerFactoryImpl cf = (ContainerFactoryImpl)
Switch.getSwitch().getContainerFactory();
EJBTimerService timerService = cf.getEJBTimerService();
TimerWrapper timer = new TimerWrapper(timerId_, timerService);
return timer;
}
}
private static class TimerHandleImpl implements TimerHandle {
private TimerPrimaryKey timerId_;
public TimerHandleImpl(TimerPrimaryKey timerId) {
timerId_ = timerId;
}
/**
* Materialize Timer from handle. This must be coded
* very defensively, since handle use might be attempted from
* outside of EJB container.
*/
public Timer getTimer() throws IllegalStateException,
NoSuchObjectLocalException, EJBException {
TimerWrapper timer = null;
Switch theSwitch = Switch.getSwitch();
if( theSwitch != null ) {
// Make sure use of timer service methods are allowed
TimerWrapper.checkCallPermission();
timer = getTimerInternal(timerId_);
} else {
throw new IllegalStateException
("Attempt to use EJB timer from outside a container");
}
return timer;
}
public static TimerWrapper getTimerInternal(TimerPrimaryKey timerId)
throws NoSuchObjectLocalException, EJBException {
TimerWrapper timer = null;
ContainerFactoryImpl cf = (ContainerFactoryImpl)
Switch.getSwitch().getContainerFactory();
EJBTimerService timerService = cf.getEJBTimerService();
if( timerService != null ) {
if( timerService.timerExists(timerId) ) {
timer = new TimerWrapper(timerId, timerService);
} else {
throw new NoSuchObjectLocalException
("timer is no longer active");
}
} else {
throw new EJBException("EJB Timer Service not available");
}
return timer;
}
}
}
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