com.sun.ejb.containers.EJBTimerService Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of payara-micro Show documentation
Show all versions of payara-micro Show documentation
Micro Distribution of the Payara Project for IBM JDK
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2012 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
// Portions Copyright [2016-2017] [Payara Foundation and/or its affiliates]
package com.sun.ejb.containers;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.FinderException;
import javax.ejb.ScheduleExpression;
import javax.ejb.TimerConfig;
import javax.transaction.Status;
import javax.transaction.Synchronization;
import javax.transaction.Transaction;
import com.sun.enterprise.admin.monitor.callflow.Agent;
import com.sun.enterprise.admin.monitor.callflow.RequestType;
import com.sun.enterprise.deployment.MethodDescriptor;
import com.sun.logging.LogDomains;
import org.glassfish.api.invocation.ComponentInvocation;
import org.glassfish.ejb.config.EjbContainer;
import org.glassfish.ejb.config.EjbTimerService;
import org.glassfish.ejb.deployment.descriptor.EjbDescriptor;
import org.glassfish.ejb.deployment.descriptor.ScheduledTimerDescriptor;
import org.glassfish.server.ServerEnvironmentImpl;
import com.sun.ejb.PersistentTimerService;
import fish.payara.nucleus.requesttracing.RequestTracingService;
import fish.payara.nucleus.requesttracing.domain.RequestEvent;
import fish.payara.nucleus.healthcheck.stuck.StuckThreadsStore;
import org.glassfish.internal.api.Globals;
/*
* EJBTimerService is the central controller of the EJB timer service.
* There is one instance of EJBTimerService per VM. All operations and
* state transitions on timers pass through EJB Timer Service. This
* reduces the overall complexity by encapsulating the timer logic
* within this class and keeping the supporting classes simple.
*
* @author Kenneth Saks
* @author Marina Vatkina
*/
public class EJBTimerService {
protected EjbContainerUtil ejbContainerUtil = EjbContainerUtilImpl.getInstance();
private long nextTimerIdMillis_ = 0;
private long nextTimerIdCounter_ = 0;
protected String domainName_;
protected boolean isDas;
// @@@ Double-check that the individual server id, domain name,
// and cluster name cannot contain the TIMER_ID_SEP
// characters.
// separator between components that make up timer id and owner id
private static final String TIMER_ID_SEP = "@@";
// Owner id of the server instance in which we are currently running.
protected String ownerIdOfThisServer_;
// A cache of timer info for all timers *owned* by this server instance.
protected TimerCache timerCache_;
private boolean shutdown_;
private RequestTracingService requestTracing;
private StuckThreadsStore stuckThreadsStore;
// Total number of ejb components initialized as timed objects between the
// start and end of a single server instance. This value is used during
// restoreTimers() as an optimization to avoid initialization overhead in
// the common case that there are no applications with timed objects.
// It is NOT intended to be a consistent count of the current number of
// timed objects, so there is no need to decrement the number when a
// container is undeployed.
protected long totalTimedObjectsInitialized_ = 0;
static final Logger logger =
LogDomains.getLogger(EJBTimerService.class, LogDomains.EJB_LOGGER);
// Timer states
public static final int STATE_ACTIVE = 0;
public static final int STATE_CANCELLED = 1;
// Defaults for configurable timer service properties.
private static final int MAX_REDELIVERIES = 1;
private static final long REDELIVERY_INTERVAL = 5000;
// minimum amount of time between either a timer creation and its first
// expiration or between subsequent timer expirations.
private long minimumDeliveryInterval_ = EjbContainerUtil.MINIMUM_TIMER_DELIVERY_INTERVAL;
// maximum number of times the container will attempt to retry a
// timer delivery before giving up.
private long maxRedeliveries_ = MAX_REDELIVERIES;
// amount of time the container waits between timer redelivery attempts.
private long redeliveryInterval_ = REDELIVERY_INTERVAL;
private static final String TIMER_SERVICE_DOWNTIME_FORMAT =
"yyyy/MM/dd HH:mm:ss";
private Agent agent = ejbContainerUtil.getCallFlowAgent();
// Allow to reschedule a failed timer for the next delivery
private static final String RESCHEDULE_FAILED_TIMER = "reschedule-failed-timer";
private boolean rescheduleFailedTimer = false;
// Flag that allows to load EJBTimerService on the 1st access and
// distinguish between not available and not loaded
private static volatile boolean _timerServiceVerified = false;
private static Object lock = new Object();
private static EJBTimerService _timerService;
protected EJBTimerService() throws Exception {
timerCache_ = new TimerCache();
shutdown_ = false;
ServerEnvironmentImpl env = ejbContainerUtil.getServerEnvironment();
// Compose owner id for all timers created with this
// server instance.
ownerIdOfThisServer_ = env.getInstanceName();
domainName_ = env.getDomainName();
isDas = env.isDas() || env.isEmbedded();
requestTracing = Globals.getDefaultHabitat().getService(RequestTracingService.class);
stuckThreadsStore = Globals.getDefaultHabitat().getService(StuckThreadsStore.class);
initProperties();
}
protected static void setEJBTimerService(EJBTimerService es) {
_timerService = es;
}
static void unsetEJBTimerService() {
_timerServiceVerified = false;
_timerService = null;
}
public static EJBTimerService getEJBTimerService() {
return getEJBTimerService(null);
}
public static EJBTimerService getValidEJBTimerService() {
getEJBTimerService();
if (_timerService == null) {
throw new EJBException("EJB Timer service not available");
}
return _timerService;
}
public static boolean isEJBTimerServiceLoaded() {
return _timerServiceVerified;
}
public static EJBTimerService getEJBTimerService(String target) {
if (!_timerServiceVerified) {
initEJBTimerService(target, true);
}
return _timerService;
}
public static EJBTimerService getEJBTimerService(String target, boolean force) {
if (!_timerServiceVerified) {
initEJBTimerService(target, force);
}
return _timerService;
}
private static synchronized void initEJBTimerService(String target, boolean force) {
if (_timerService == null) {
List persistentTSList =
EjbContainerUtilImpl.getInstance().getServices().getAllServices(PersistentTimerService.class);
if (persistentTSList.isEmpty()) {
try {
_timerService = new EJBTimerService();
_timerServiceVerified = true;
} catch (Exception e) {
logger.log (Level.WARNING, "Cannot start EJBTimerService: ", e);
}
} else {
synchronized (lock) {
// choose service based on the configuration setting
EjbContainerUtil ejbContainerUtil = EjbContainerUtilImpl.getInstance();
String serviceType = ejbContainerUtil.getEjbContainer().getEjbTimerService().getEJBTimerService();
PersistentTimerService persistentTS = null;
for (PersistentTimerService pts : persistentTSList) {
if (pts.getClass().getSimpleName().startsWith(serviceType)) {
persistentTS = pts;
break;
}
}
if (persistentTS != null) {
persistentTS.initPersistentTimerService(target);
} else { // Fall back to the non-persistent service
try {
_timerService = new EJBTimerService();
} catch (Exception e) {
logger.log (Level.WARNING, "Cannot start EJBTimerService: ", e);
}
}
_timerServiceVerified = true;
}
// Do postprocessing if everything is OK
if (_timerService != null) {
_timerService.resetEJBTimers(target);
} else if (!force) {
// If it was a request with force == false, and we failed to load the service,
// do not mark it as verified
_timerServiceVerified = false;
}
}
}
}
private void initProperties() {
try {
// Check for property settings from domain.xml
EjbContainer ejbc = ejbContainerUtil.getEjbContainer();
EjbTimerService ejbt = ejbc.getEjbTimerService();
if( ejbt != null ) {
String valString = ejbt.getMinimumDeliveryIntervalInMillis();
long val = (valString != null) ?
Long.parseLong(valString) : -1;
if( val > 0 ) {
minimumDeliveryInterval_ = val;
}
valString = ejbt.getMaxRedeliveries();
val = (valString != null) ? Long.parseLong(valString) : -1;
// EJB 2.1 specification minimum is 1
if( val > 0 ) {
maxRedeliveries_ = val;
}
valString = ejbt.getRedeliveryIntervalInternalInMillis();
val = (valString != null) ? Long.parseLong(valString) : -1;
if( val > 0 ) {
redeliveryInterval_ = val;
}
rescheduleFailedTimer = Boolean.valueOf(ejbt.getPropertyValue(RESCHEDULE_FAILED_TIMER));
// Load confing listener
ejbContainerUtil.getServices().getService(EJBTimerServiceConfigListener.class);
}
} catch(Exception e) {
logger.log(Level.FINE, "Exception converting timer service " +
"domain.xml properties. Defaults will be used instead.", e);
}
logger.log(Level.FINE, "EJB Timer Service properties : " +
"min delivery interval = " + getMinimumDeliveryInterval() +
"\nmax redeliveries = " + maxRedeliveries_ +
"\nredelivery interval = " + getRedeliveryInterval());
}
synchronized void timedObjectCount() {
totalTimedObjectsInitialized_++;
}
/**
* Return the ownerId of the server instance in
* which we are running.
*/
public String getOwnerIdOfThisServer() {
return ownerIdOfThisServer_;
}
/**
*--------------------------------------------------------------
* Methods to be implemented for Admin CLI
*--------------------------------------------------------------
*/
/**
* Provide a count of timers owned by each server. Persistence
* timers are unknown to non-persistent timer service
*/
public String[] listTimers( String[] serverIds ) {
String[] result = new String[serverIds.length];
for (int i=0; i timerIds) {
for(TimerPrimaryKey nextTimerId: timerIds) {
RuntimeTimerState nextTimerState = null;
try {
nextTimerState = getTimerState(nextTimerId);
if( nextTimerState != null ) {
synchronized(nextTimerState) {
if( nextTimerState.isScheduled() ) {
EJBTimerTask timerTask =
nextTimerState.getCurrentTimerTask();
timerTask.cancel();
}
}
}
} catch(Exception e) {
logger.log(Level.WARNING, "ejb.destroy_timer_error",
new Object[] { nextTimerId });
logger.log(Level.WARNING, "", e);
} finally {
if( nextTimerState != null ) {
timerCache_.removeTimer(nextTimerId);
}
}
}
}
private void rescheduleTask(TimerPrimaryKey timerId, Date expiration) {
scheduleTask(timerId, expiration, true);
}
protected void scheduleTask(TimerPrimaryKey timerId, Date expiration) {
scheduleTask(timerId, expiration, false);
}
void scheduleTask(TimerPrimaryKey timerId, Date expiration,
boolean rescheduled) {
RuntimeTimerState timerState = getTimerState(timerId);
if( timerState != null ) {
synchronized(timerState) {
Date timerExpiration = expiration;
if( !rescheduled ) {
// Guard against very small timer intervals. The EJB Timer
// service is defined in units of milliseconds, but it is
// intended for coarse-grained events. Very small timer
// intervals (e.g. 1 millisecond) are likely to overload
// the server, so compensate by adjusting to a configurable
// minimum interval.
Date cutoff = new Date(new Date().getTime() +
getMinimumDeliveryInterval());
if( expiration.before(cutoff) ) {
timerExpiration = cutoff;
}
}
EJBTimerTask timerTask =
new EJBTimerTask(timerExpiration, timerId, this);
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, (rescheduled ? "RE-" : "") +
"Scheduling " + timerState +
" for timeout at " + timerExpiration);
}
if( rescheduled ) {
timerState.rescheduled(timerTask);
} else {
timerState.scheduled(timerTask);
}
java.util.Timer jdkTimer = ejbContainerUtil.getTimer();
jdkTimer.schedule(timerTask, timerExpiration);
}
} else {
logger.log(Level.FINE, "No timer state found for " +
(rescheduled ? "RE-schedule" : "schedule") +
" request of " + timerId +
" for timeout at " + expiration);
}
}
/**
* Called by #cancelTimerSynchronization() to cancel the next scheduled expiration
* for a timer.
* @return (initialExpiration time) if state is CREATED or
* (time that expiration would have occurred) if state=SCHEDULED or
* (null) if state is BEING_DELIVERED or timer id not found
*/
Date cancelTask(TimerPrimaryKey timerId) {
Date timeout = null;
RuntimeTimerState timerState = getTimerState(timerId);
if( timerState != null ) {
synchronized(timerState) {
if( timerState.isCreated() ) {
timeout = timerState.getInitialExpiration();
} else if( timerState.isScheduled() ) {
EJBTimerTask timerTask = timerState.getCurrentTimerTask();
timeout = timerTask.getTimeout();
timerTask.cancel();
}
timerState.cancelled();
}
} else {
logger.log(Level.FINE, "No timer state found for " +
"cancelTask request of " + timerId);
}
return timeout;
}
/**
* Called from TimerBean in case where Timer is cancelled from within
* its own ejbTimeout method and then rolled back.
*/
void restoreTaskToDelivered(TimerPrimaryKey timerId) {
RuntimeTimerState timerState = getTimerState(timerId);
if( timerState != null ) {
synchronized(timerState) {
timerState.restoredToDelivered();
}
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Restoring " + timerId +
" to delivered state after it was cancelled and " +
" rolled back from within its own ejbTimeout method");
}
} else {
logger.log(Level.FINE, "No timer state found for " +
"restoreTaskToDelivered request of " + timerId);
}
}
private void expungeTimer(TimerPrimaryKey timerId) {
// Expunge timer from timer cache without removing timer associated
// timer bean.
expungeTimer(timerId, false);
}
protected Date calcNextFixedRateExpiration(RuntimeTimerState timerState) {
if( !timerState.isPeriodic() ) {
throw new IllegalStateException("Timer " + timerState + " is " +
"not a periodic timer");
}
EJBTimerSchedule ts = timerState.getTimerSchedule();
if (ts != null) {
return getNextScheduledTimeout(ts);
}
Date initialExpiration = timerState.getInitialExpiration();
long intervalDuration = timerState.getIntervalDuration();
return calcNextFixedRateExpiration(initialExpiration, intervalDuration);
}
protected Date calcNextFixedRateExpiration(Date initialExpiration,
long intervalDuration) {
Date now = new Date();
long nowMillis = now.getTime();
// In simplest case, initial expiration hasn't even occurred yet.
Date nextExpirationTime = initialExpiration;
if( now.after(initialExpiration) ) {
long timeSinceInitialExpire =
(nowMillis - initialExpiration.getTime());
// number of time intervals since initial expiration.
// intervalDuration is guaranteed to be >0 since this is a
// periodic timer.
long numIntervals =
(timeSinceInitialExpire / intervalDuration);
// Increment the number of intervals and multiply by the interval
// duration to calculate the next fixed-rate boundary.
nextExpirationTime = new Date(initialExpiration.getTime() +
((numIntervals + 1) * intervalDuration));
}
return nextExpirationTime;
}
/**
* Remove all traces of a timer. This should be written defensively
* so that if expunge is called multiple times for the same timer id,
* the second, third, fourth, etc. calls will not cause exceptions.
*/
protected void expungeTimer(TimerPrimaryKey timerId,
boolean removeTimerBean) {
timerCache_.removeTimer(timerId);
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
* @return Primary key of newly created timer
*/
TimerPrimaryKey createTimer(long containerId, long applicationId, Object timedObjectPrimaryKey,
long initialDuration, long intervalDuration,
TimerConfig timerConfig) throws CreateException {
Date now = new Date();
Date initialExpiration = new Date(now.getTime() + initialDuration);
return createTimer(containerId, applicationId, timedObjectPrimaryKey,
initialExpiration, intervalDuration, timerConfig);
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
* @return Primary key of newly created timer
*/
TimerPrimaryKey createTimer(long containerId, long applicationId, Object timedObjectPrimaryKey,
Date initialExpiration, long intervalDuration,
TimerConfig timerConfig) throws CreateException {
return createTimer(containerId, applicationId, timedObjectPrimaryKey,
initialExpiration, intervalDuration, null, timerConfig);
}
/**
* @return Primary key of newly created timer
*/
TimerPrimaryKey createTimer(long containerId, long applicationId, EJBTimerSchedule schedule,
TimerConfig timerConfig, String server_name)
throws CreateException {
return createTimer(containerId, applicationId, null, null, 0, schedule, timerConfig, server_name);
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
* @return Primary key of newly created timer
*/
TimerPrimaryKey createTimer(long containerId, long applicationId, Object timedObjectPrimaryKey,
EJBTimerSchedule schedule, TimerConfig timerConfig)
throws CreateException {
return createTimer(containerId, applicationId, timedObjectPrimaryKey,
null, 0, schedule, timerConfig, ownerIdOfThisServer_);
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
* @return Primary key of newly created timer
*/
private TimerPrimaryKey createTimer(long containerId, long applicationId, Object timedObjectPrimaryKey,
Date initialExpiration, long intervalDuration,
EJBTimerSchedule schedule, TimerConfig timerConfig)
throws CreateException {
return createTimer(containerId, applicationId, timedObjectPrimaryKey, initialExpiration,
intervalDuration, schedule, timerConfig, ownerIdOfThisServer_);
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
* @return Primary key of newly created timer
*/
private TimerPrimaryKey createTimer(long containerId, long applicationId, Object timedObjectPrimaryKey,
Date initialExpiration, long intervalDuration,
EJBTimerSchedule schedule, TimerConfig timerConfig,
String server_name)
throws CreateException {
BaseContainer container = getContainer(containerId);
boolean startTimers = ownerIdOfThisServer_.equals(server_name);
if (startTimers) {
if( container == null ) {
throw new CreateException("invalid container id " + containerId +
" in createTimer request");
}
Class ejbClass = container.getEJBClass();
if( !container.isTimedObject() ) {
throw new CreateException
("Attempt to create an EJB Timer from a bean that is " +
"not a Timed Object. EJB class " + ejbClass +
" must implement javax.ejb.TimedObject or " +
" annotation a timeout method with @Timeout");
}
}
TimerPrimaryKey timerId = new TimerPrimaryKey(getNextTimerId());
if (schedule != null) {
Calendar next = schedule.getNextTimeout();
if( !schedule.isValid(next) ) {
initialExpiration = new Date();
} else {
initialExpiration = next.getTime();
}
}
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "@@@ Created timer [" + timerId +
"] with the first expiration set to: " + initialExpiration);
}
if (timerConfig == null) {
// Easier create one than check everywhere for null...
timerConfig = new TimerConfig();
}
RuntimeTimerState timerState =
new RuntimeTimerState(timerId, initialExpiration,
intervalDuration, containerId, container,
timedObjectPrimaryKey,
schedule, timerConfig.getInfo(),
timerConfig.isPersistent());
synchronized(timerState) {
// Add timer entry before calling TimerBean.create, since
// create() actions might call back on EJBTimerService and
// need access to timer cache.
if (startTimers) {
timerCache_.addTimer(timerId, timerState);
}
try {
_createTimer(timerId, containerId, applicationId, timedObjectPrimaryKey,
server_name, initialExpiration, intervalDuration,
schedule, timerConfig);
} catch(Exception e) {
logger.log(Level.SEVERE, "ejb.create_timer_failure",
new Object[] { String.valueOf(containerId),
timedObjectPrimaryKey,
timerConfig.getInfo() });
logger.log(Level.SEVERE, "", e);
// Since timer was never created, remove it from cache.
timerCache_.removeTimer(timerId);
if( e instanceof CreateException ) {
throw ((CreateException)e);
} else {
EJBException ejbEx = new EJBException();
ejbEx.initCause(e);
throw ejbEx;
}
}
}
return timerId;
}
/**
* @param timedObjectPrimaryKey can be null if timed object is not an entity bean.
*/
protected void _createTimer(TimerPrimaryKey timerId, long containerId, long applicationId,
Object timedObjectPrimaryKey, String server_name,
Date initialExpiration, long intervalDuration,
EJBTimerSchedule schedule, TimerConfig timerConfig)
throws Exception {
if (timerConfig.isPersistent()) {
// TODO
throw new CreateException("Persistent timers are not supported in this setup");
} else {
addTimerSynchronization(null, timerId.getTimerId(), initialExpiration,
containerId, ownerIdOfThisServer_, false);
}
}
/**
* Create automatic non-persistent timers defined by the @Schedule
* annotation on the EJB bean. Recover part is a no-op in thise case.
*
* @return a Map of created timers, where the key is TimerPrimaryKey
* and the value is the Method to be executed by the container when the timer with
* this PK times out.
*/
protected Map recoverAndCreateSchedules(
long containerId, long applicationId,
Map> schedules,
boolean deploy) {
Map result = new HashMap();
try {
createSchedules(containerId, applicationId, schedules, result, ownerIdOfThisServer_, true, (deploy && isDas));
} catch(EJBException e) {
throw e;
} catch(Exception e) {
EJBException ejbEx = createEJBException( e );
throw ejbEx;
}
return result;
}
/**
* Called in a clustered environment to eagerly create automatic persistent timers
* on the specific server instance.
* In a EJB Lite distribution if there is at least one persistent automatic timer
* defined, this method will fail with a RuntimeException.
*/
public void createSchedulesOnServer(EjbDescriptor ejbDescriptor, String server_name) {
for (ScheduledTimerDescriptor schd : ejbDescriptor.getScheduledTimerDescriptors()) {
if (schd.getTimeoutMethod() != null && schd.getPersistent()) {
throw new RuntimeException("EJB " +
ejbDescriptor.getName() + " uses persistent EJB Timer Service"
+ ". This feature is not part of the EJB Lite API");
}
}
}
/**
* Create automatic timers defined by the @Schedule annotation on the EJB bean during
* deployment to a cluster or the first create-application-ref call after deployment
* to DAS only.
*
* Only persistent schedule based timers for the containerId that has no timers associated
* with it, will be created. And no timers will be scheduled.
*/
public void createSchedules(long containerId, long applicationId,
Map> methodDescriptorSchedules, String server_name) {
try {
createSchedules(containerId, applicationId, methodDescriptorSchedules, null, server_name, false, true);
} catch(EJBException e) {
throw e;
} catch(Exception e) {
EJBException ejbEx = createEJBException( e );
throw ejbEx;
}
}
/**
* Create automatic timers defined by the @Schedule annotation on the EJB bean.
*
* XXX???
* If this method is called on a deploy in a clustered deployment, only persistent schedule
* based timers will be created. And no timers will be scheduled.
* If it is called from deploy on a non-clustered instance, both
* persistent and non-persistent timers will be created.
* Otherwise only non-persistent timers are created by this method.
*/
protected void createSchedules(long containerId, long applicationId,
Map> schedules,
Map result,
String server_name, boolean startTimers, boolean deploy) throws Exception {
for (Map.Entry> entry : schedules.entrySet()) {
Object key = entry.getKey();
String mname = null;
int args_length = 0;
if (key instanceof Method) {
mname = ((Method)key).getName();
args_length = ((Method)key).getParameterTypes().length;
} else {
mname = ((MethodDescriptor)key).getName();
args_length = ((MethodDescriptor)key).getJavaParameterClassNames().length;
}
for (ScheduledTimerDescriptor sch : entry.getValue()) {
boolean persistent = sch.getPersistent();
if ((persistent && !deploy) || (!persistent && !startTimers)) {
// Do not recreate schedule-based timers on restart or create
// non-persistent timers on a clustered deploy
continue;
}
EJBTimerSchedule ts = new EJBTimerSchedule(sch, mname, args_length);
TimerConfig tc = new TimerConfig();
String info = sch.getInfo();
if (info != null && !info.equals("")) {
tc.setInfo(info);
}
tc.setPersistent(persistent);
TimerPrimaryKey tpk = createTimer(containerId, applicationId, ts, tc, server_name);
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "@@@ CREATED new schedule: " + ts.getScheduleAsString() + " FOR method: " + key);
}
if (startTimers && result != null) {
result.put(tpk, (Method)key);
}
}
}
}
/**
* Called by EJBTimerServiceWrapper when caller calls getTimers.
*
* @param containerId the id of the EJB which owns the timers
* @param timedObjectPrimaryKey can be null if not entity bean
* @return Collection of Timer Ids.
*/
protected Collection getTimerIds(long containerId, Object timedObjectPrimaryKey) {
Collection timerIdsForTimedObject =
new HashSet();
// Add active non-persistent timer ids
timerIdsForTimedObject.addAll(
timerCache_.getNonPersistentActiveTimerIdsForContainer(containerId));
return timerIdsForTimedObject;
}
/**
* @param containerIds the EJBs which own the timers
* @return Collection of Timer Ids.
*/
protected Collection getTimerIds(Collection containerIds) {
Collection timerIds = new HashSet();
for (long containerId : containerIds) {
timerIds.addAll(timerCache_.getNonPersistentActiveTimerIdsForContainer(containerId));
}
return timerIds;
}
/**
* Get the application class loader for the timed object
* that created a given timer.
*/
public ClassLoader getTimerClassLoader(long containerId) {
BaseContainer container = getContainer(containerId);
return (container != null) ? container.getClassLoader() : null;
}
protected RuntimeTimerState getTimerState(TimerPrimaryKey timerId) {
return timerCache_.getTimerState(timerId);
}
private RuntimeTimerState getNonPersistentTimerState(TimerPrimaryKey timerId) {
return timerCache_.getNonPersistentTimerState(timerId);
}
// Returns a Set of active non-persistent timer ids for this server
public Set getNonPersistentActiveTimerIdsByThisServer() {
return timerCache_.getNonPersistentActiveTimerIdsByThisServer();
}
/**
* Cancel all timers associated with a particular entity bean
* identity. This is typically called when an entity bean is
* removed. Note that this action falls under the normal EJB
* Timer removal semantics, which means it can be rolled back
* if the transaction rolls back.
*/
protected void cancelTimersByKey(long containerId, Object primaryKey) {
//Do nothing or throw an exception?
}
//
// Logic used by TimerWrapper for javax.ejb.Timer methods.
//
protected void cancelTimer(TimerPrimaryKey timerId)
throws FinderException, Exception {
cancelNonPersistentTimer(timerId);
}
protected boolean cancelNonPersistentTimer(TimerPrimaryKey timerId)
throws FinderException, Exception {
RuntimeTimerState rt = getNonPersistentTimerState(timerId);
if (rt != null) {
if( rt.isCancelled()) {
// already cancelled or removed
return true;
}
cancelTimerSynchronization(null, timerId,
rt.getContainerId(), ownerIdOfThisServer_, false);
}
return (rt != null);
}
/**
* Return next planned timeout for this timer. We have a fair amount
* of leeway regarding the consistency of this information. We should
* strive to detect the case where the timer no longer exists. However,
* since the current timer instance may not even own this timer,
* it's difficult to know the exact time of delivery in another server
* instance. In the case of single-action timers, we return the
* expiration time that was provided upon timer creation. For
* periodic timers, we can derive the next scheduled fixed rate
* expiration based on the initial expiration and the interval.
*/
protected Date getNextTimeout(TimerPrimaryKey timerId) throws FinderException {
RuntimeTimerState rt = getNonPersistentTimer(timerId);
if (rt != null) {
return _getNextTimeout(rt);
}
throw new FinderException("Timer does not exist");
}
/**
* Non-persistent part of the implementation of the getNextTimeout() call
*/
protected Date _getNextTimeout(RuntimeTimerState rt) {
Date initialExpiration = rt.getInitialExpiration();
long intervalDuration = rt.getIntervalDuration();
EJBTimerSchedule ts = rt.getTimerSchedule();
Date nextTimeout = initialExpiration;
if (ts != null) {
nextTimeout = getNextScheduledTimeout(ts);
// The caller is responsible to return 0 or -1 for the time remaining....
} else if (intervalDuration > 0) {
nextTimeout = calcNextFixedRateExpiration(initialExpiration,
intervalDuration);
}
return nextTimeout;
}
protected Serializable getInfo(TimerPrimaryKey timerId) throws FinderException {
// Check non-persistent timers only
RuntimeTimerState rt = getNonPersistentTimer(timerId);
if (rt != null) {
return rt.getInfo();
}
return null;
}
ScheduleExpression getScheduleExpression(TimerPrimaryKey timerId) throws FinderException {
EJBTimerSchedule ts = getTimerSchedule(timerId);
return (ts == null)? null : ts.getScheduleExpression();
}
boolean isCalendarTimer(TimerPrimaryKey timerId) throws FinderException {
EJBTimerSchedule ts = getTimerSchedule(timerId);
return (ts != null);
}
protected boolean isPersistent(TimerPrimaryKey timerId) throws FinderException {
// Check non-persistent timers only
RuntimeTimerState rt = getNonPersistentTimer(timerId);
if (rt != null) {
// Found and active
return false;
}
// XXX?
return true;
}
protected boolean timerExists(TimerPrimaryKey timerId) {
boolean exists = false;
// Check non-persistent timers only
RuntimeTimerState rt = getNonPersistentTimerState(timerId);
if (rt != null) {
exists = rt.isActive();
}
return exists;
}
/**
* Called by #getScheduleExpression and #isCalendarTimer
*/
protected EJBTimerSchedule getTimerSchedule(TimerPrimaryKey timerId) throws FinderException {
// Check non-persistent timers first
EJBTimerSchedule ts = null;
RuntimeTimerState rt = getNonPersistentTimer(timerId);
if (rt != null) {
ts = rt.getTimerSchedule();
}
return ts;
}
protected RuntimeTimerState getNonPersistentTimer(TimerPrimaryKey timerId)
throws FinderException {
RuntimeTimerState rt = getNonPersistentTimerState(timerId);
if (rt != null) {
if (rt.isCancelled()) {
// The timer has been cancelled within this tx.
throw new FinderException("Non-persistent timer " + timerId
+ " does not exist");
}
}
return rt;
}
protected BaseContainer getContainer(long containerId) {
return ejbContainerUtil.getContainer(containerId);
}
/**
* Called from timer thread. Used to deliver ejb timeout.
*/
private void deliverTimeout(TimerPrimaryKey timerId) {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "EJBTimerService.deliverTimeout(): work "
+
"thread is processing work for timerId = " + timerId);
}
if( shutdown_ ) {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Cancelling timeout for " + timerId +
" due to server shutdown. Expiration " +
" will occur when server is restarted.");
}
return;
}
RuntimeTimerState timerState = getTimerState(timerId);
//
// Make some defensive state checks. It's possible that the
// timer state changed between the time that the JDK timer task expired
// and we got called on this thread.
//
if( timerState == null ) {
logger.log(Level.FINE, "Timer state is NULL for timer " + timerId +
" in deliverTimeout");
return;
}
BaseContainer container = getContainer(timerState.getContainerId());
synchronized(timerState) {
if( container == null ) {
logger.log(Level.FINE, "Unknown container for timer " +
timerId + " in deliverTimeout. Expunging timer.");
expungeTimer(timerId, true);
return;
} else if ( !timerState.isBeingDelivered() ) {
logger.log(Level.FINE, "Timer state = " +
timerState.stateToString() +
"for timer " + timerId + " before callEJBTimeout");
return;
} else {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Calling ejbTimeout for timer " +
timerState);
}
}
}
try {
agent.requestStart(RequestType.TIMER_EJB);
container.onEnteringContainer();
// Need to address the case that another server instance
// cancelled this timer. For maximum consistency, we will need
// to do a database read before each delivery. This can have
// significant performance implications, so investigate possible
// reduced consistency tradeoffs.
if (isCancelledByAnotherInstance(timerState)) {
return;
}
///
// Call container to invoke ejbTimeout on the bean instance.
// The remaining actions are divided up into two categories :
//
// 1) Actions that should be done within the same transaction
// context as the ejbTimeout call itself. These are
// handled by having the ejb container call back on the
// postEjbTimeout method after it has invoked bean.ejbTimeout
// but *before* it has called postInvoke. That way any
// transactional operations like setting the last update time
// for periodic timers or removing a successfully delivered
// single-action timer can be done within the same tx as
// the ejbTimeout itself. Note that there is no requirement
// that the ejbTimeout will be configured for CMT/RequiresNew.
// If there isn't a container-managed transaction,
// postEjbTimeout will still be called, and the database
// operations will be done in their own transaction. While
// partitioning the actions like this adds some complexity,
// it's preferable to pushing this detailed timer semantics
// into the container's callEJBTimeout logic.
//
// 2) Post-processing for setting up next timer delivery and
// other redelivery conditions.
//
// Do not deliver bogus timeout, but continue processing and
// cancel such timer
boolean redeliver = (timerState.isExpired())? false :
container.callEJBTimeout(timerState, this);
if( shutdown_ ) {
// Server is shutting down so we can't finish processing
// the timer expiration.
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Cancelling timeout for " + timerId
+
" due to server shutdown. Expiration will " +
" occur on server restart");
}
return;
}
// Resynchronize on timer state since a state change could have
// happened either within ejbTimeout or somewhere else
timerState = getTimerState(timerId);
if( timerState == null ) {
// This isn't an error case. The most likely reason is that
// the ejbTimeout method itself cancelled the timer or the bean was disabled.
logger.log(Level.FINE, "Timer no longer exists for " +
timerId + " after callEJBTimeout");
return;
}
synchronized(timerState) {
Date now = new Date();
boolean reschedule = false;
if( timerState.isCancelled() ) {
// nothing more to do.
} else if (timerState.isExpired()) {
// schedule-based timer without valid expiration
cancelTimer(timerId);
} else if( redeliver ) {
int numDeliv = timerState.getNumFailedDeliveries() + 1;
if( redeliverTimeout(timerState) ) {
Date redeliveryTimeout = new Date
(now.getTime() + getRedeliveryInterval());
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE,"Redelivering " + timerState);
}
rescheduleTask(timerId, redeliveryTimeout);
} else if (stopOnFailure()) {
// stop Timer Service
shutdown();
} else if (rescheduleFailedTimer) {
logger.log(Level.INFO, "ejb.timer_reschedule_after_max_deliveries",
new Object[] { timerState.toString(), numDeliv});
reschedule = true;
} else {
logger.log(Level.INFO, "ejb.timer_exceeded_max_deliveries",
new Object[] { timerState.toString(), numDeliv});
expungeTimer(timerId, true);
}
} else {
reschedule = true;
}
if( reschedule && (redeliver || timerState.isPeriodic()) ) {
// Any necessary transactional operations would have
// been handled in postEjbTimeout callback. Here, we
// just schedule the JDK timer task for the next ejbTimeout
Date expiration = calcNextFixedRateExpiration(timerState);
if (expiration != null) {
scheduleTask(timerId, expiration);
} else {
// schedule-based timer ended.
cancelTimer(timerId);
}
} else {
// Any necessary transactional operations would have
// been handled above or in postEjbTimeout callback. Nothing
// more to do for this single-action timer that was
// successfully delivered.
}
}
} catch(Exception e) {
logger.log(Level.INFO, "callEJBTimeout threw exception " +
"for timer id " + timerId , e);
expungeTimer(timerId, true);
} finally {
container.onLeavingContainer();
agent.requestEnd();
}
}
/**
* For a non-persistent timer, it's not possible to be cancelled by another
* server instance
*/
protected boolean isCancelledByAnotherInstance(RuntimeTimerState timerState) {
return false;
}
/**
* @return true if this timer should be redelivered
*/
protected boolean redeliverTimeout(RuntimeTimerState timerState) {
return ( timerState.getNumFailedDeliveries() < getMaxRedeliveries() );
}
protected boolean stopOnFailure() {
return false;
}
/**
* Called from BaseContainer during callEJBTimeout after bean.ejbTimeout
* but before postInvoke. NOTE that this method is called whether or not
* the ejbTimeout method is configured for container-managed transactions.
* This method is *NOT* called if the container has already determined
* that a redelivery is necessary.
*
* @return true if successful , false otherwise.
*/
boolean postEjbTimeout(TimerPrimaryKey timerId) {
boolean success = true;
if( shutdown_ ) {
// Server is shutting down so we can't finish processing
// the timer expiration.
return success;
}
// Resynchronize on timer state since a state change could have
// happened either within ejbTimeout or somewhere else
RuntimeTimerState timerState = getTimerState(timerId);
if( timerState != null ) {
// Since the ejbTimeout was called successfully increment the
// delivery count
BaseContainer container = getContainer(timerState.getContainerId());
container.incrementDeliveredTimedObject();
synchronized(timerState) {
if( timerState.isCancelled() ) {
// nothing more to do.
} else {
try {
if (!isValidTimerForThisServer(timerId, timerState)) {
return false;
}
if( timerState.isPeriodic() ) {
resetLastExpiration(timerId, timerState);
} else {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Single-action timer " +
timerState + " was successfully delivered. "
+ " Removing...");
}
// Timer has expired sucessfully, so remove it.
// XXX the original logic relied on the tx being executed on CMP if needed
// XXX the original logic didn't need a FinderException as it assumed that it's in the same tx XXX
cancelTimer(timerId);
}
} catch(Exception e) {
// @@@ i18N
logger.log(Level.WARNING, "Error in post-ejbTimeout " +
"timer processing for " + timerState, e);
success = false;
}
}
}
}
return success;
}
/**
* Non-persistent timers are always valid because to be
* executed on this server instance.
*/
protected boolean isValidTimerForThisServer(TimerPrimaryKey timerId,
RuntimeTimerState timerState) {
return true;
}
/**
* Nothing special to do for non-persistent timers
*/
protected void resetLastExpiration(TimerPrimaryKey timerId,
RuntimeTimerState timerState) {
// Do nothing
}
/**
* This method is called back from the EJBTimerTask object
* on the JDK Timer Thread. Work performed in this callback
* should be short-lived, so do a little bookkeeping and then
* launch a separate thread to invoke ejbTimeout, etc.
*/
void taskExpired(TimerPrimaryKey timerId) {
RuntimeTimerState timerState = getTimerState(timerId);
if( timerState != null ) {
synchronized(timerState) {
if( timerState.isScheduled() ) {
timerState.delivered();
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE,
"Adding work pool task for timer " + timerId);
}
TaskExpiredWork work = new TaskExpiredWork(this, timerId,requestTracing, stuckThreadsStore);
ejbContainerUtil.addWork(work);
} else {
logger.log(Level.FINE, "Timer " + timerId +
" is not in scheduled state. Current state = "
+ timerState.stateToString());
}
}
} else {
logger.log(Level.FINE, "null timer state for timer id " + timerId);
}
return;
}
/**
* Generate a unique key for the persistent timer object.
* Key must be unique across server shutdown and startup, and
* within all server instances sharing the same timer table.
*/
private synchronized String getNextTimerId() {
if( nextTimerIdCounter_ <= 0 ) {
nextTimerIdMillis_ = System.currentTimeMillis();
nextTimerIdCounter_ = 1;
} else {
nextTimerIdCounter_++;
}
// @@@ Add cluster ID
return "" + nextTimerIdCounter_ +
TIMER_ID_SEP + nextTimerIdMillis_ +
TIMER_ID_SEP + ownerIdOfThisServer_ +
TIMER_ID_SEP + domainName_;
}
//
// Accessors for timer service properties.
//
private long getMinimumDeliveryInterval() {
return minimumDeliveryInterval_;
}
protected long getMaxRedeliveries() {
return maxRedeliveries_;
}
private long getRedeliveryInterval() {
return redeliveryInterval_;
}
public void addTimerSynchronization(EJBContextImpl context_, String timerId,
Date initialExpiration, long containerId, String ownerId)
throws Exception {
addTimerSynchronization(context_, timerId, initialExpiration,
containerId, ownerId, true);
}
public void addTimerSynchronization(EJBContextImpl context_, String timerId,
Date initialExpiration, long containerId, String ownerId,
boolean persistent) throws Exception {
// context_ is null for a non-persistent timer as it's not called
// from the TimerBean.
if (context_ == null || timerOwnedByThisServer(ownerId)) {
TimerPrimaryKey pk = new TimerPrimaryKey(timerId);
ContainerSynchronization containerSynch = getContainerSynch(context_, timerId, persistent);
if (containerSynch == null) {
// null ContainerSynchronization for persistent timer would've
// caused exception in #getContainerSynch(). For non-persistent
// timer schedule it right away
scheduleTask(pk, initialExpiration);
ejbContainerUtil.getContainer(containerId).incrementCreatedTimedObject();
} else {
// Register a synchronization object to handle the commit/rollback
// semantics and ejbTimeout notifications.
Synchronization timerSynch =
new TimerSynch(pk, STATE_ACTIVE, initialExpiration,
ejbContainerUtil.getContainer(containerId),
this);
containerSynch.addTimerSynchronization(pk, timerSynch);
}
}
}
public void cancelTimerSynchronization(EJBContextImpl context_,
TimerPrimaryKey timerId, long containerId, String ownerId)
throws Exception {
cancelTimerSynchronization(context_, timerId, containerId, ownerId, true);
}
private void cancelTimerSynchronization(EJBContextImpl context_,
TimerPrimaryKey timerId, long containerId, String ownerId,
boolean persistent) throws Exception {
// Only proceed with JDK timer task cancellation if this timer
// is owned by the current server instance.
if( context_ == null || timerOwnedByThisServer(ownerId) ) {
// Cancel existing timer task. Save time at which task would
// have executed in case cancellation is rolled back. The
// nextTimeout can be null if the timer is currently being
// delivered.
Date nextTimeout = cancelTask(timerId);
ContainerSynchronization containerSynch =
getContainerSynch(context_, timerId.getTimerId(), persistent);
if (containerSynch == null) {
// null ContainerSynchronization for persistent timer would've
// caused exception in #getContainerSynch(). For non-persistent
// timer remove it right away
expungeTimer(timerId);
ejbContainerUtil.getContainer(containerId).incrementRemovedTimedObject();
} else {
Synchronization timerSynch =
containerSynch.getTimerSynchronization(timerId);
if( timerSynch != null ) {
// This timer was created and cancelled within the
// same transaction. No tx synchronization actions
// are needed, since whether tx commits or rolls back,
// timer will not exist.
containerSynch.removeTimerSynchronization(timerId);
expungeTimer(timerId);
} else {
// Set tx synchronization action to handle timer cancellation.
timerSynch = new TimerSynch(timerId, STATE_CANCELLED, nextTimeout,
ejbContainerUtil.getContainer(containerId),
this);
containerSynch.addTimerSynchronization(timerId, timerSynch);
}
}
}
}
/**
* Checks whether this timer is owned by the server instance in
* which we are running.
*/
private boolean timerOwnedByThisServer(String ownerId) {
String ownerIdOfThisServer = getOwnerIdOfThisServer();
return ( (ownerIdOfThisServer != null) &&
(ownerIdOfThisServer.equals(ownerId)) );
}
/**
* Returns next schedule-based timeout or null if such schedule will
* not expire again.
*/
protected Date getNextScheduledTimeout(EJBTimerSchedule ts) {
Calendar next = ts.getNextTimeout();
if( ts.isValid(next) ) {
return next.getTime();
} else { // Expired or no timeouts available
return null;
}
}
ContainerSynchronization getContainerSynch(EJBContextImpl context_,
String timerId, boolean persistent) throws Exception {
Transaction transaction = null;
if (context_ != null) {
transaction = context_.getTransaction();
}
if( transaction == null ) {
ComponentInvocation i = ejbContainerUtil.getCurrentInvocation();
if (i == null) {
// This should happen only when creating timers for methods annotated with @Schedule
transaction = ejbContainerUtil.getTransactionManager().getTransaction();
} else {
transaction = (Transaction) i.getTransaction();
if (context_ != null && transaction != null) {
// Need to know when it happens
logger.log(Level.WARNING, "Context transaction in TimerBean = null. Using " +
"invocation instead."); // , new Throwable());
}
}
}
if( transaction == null ) {
if (persistent) {
// Shouldn't happen
throw new Exception("transaction = null in getContainerSynch " +
"for timerId = " + timerId);
} else {
// null ContainerSynchronization for non-persistent timer will
// schedule or cancel it right away
return null;
}
}
return ejbContainerUtil.getContainerSync(transaction);
}
public boolean isPersistent() {
return false;
}
/**
* Called from TimerBean PreDestroy
*/
public static void onShutdown() {
if( _timerService == null || _timerService.shutdown_ ) {
return;
}
_timerService.shutdown();
DateFormat dateFormat =
new SimpleDateFormat(TIMER_SERVICE_DOWNTIME_FORMAT);
String downTimeStr = dateFormat.format(new Date());
logger.log(Level.INFO, "ejb.timer_service_shutdown_msg",
new Object[] { downTimeStr });
}
static String txStatusToString(int txStatus) {
String txStatusStr = "UNMATCHED TX STATUS";
switch(txStatus) {
case Status.STATUS_ACTIVE :
txStatusStr = "TX_STATUS_ACTIVE";
break;
case Status.STATUS_COMMITTED :
txStatusStr = "TX_STATUS_COMMITTED";
break;
case Status.STATUS_COMMITTING :
txStatusStr = "TX_STATUS_COMMITTING";
break;
case Status.STATUS_MARKED_ROLLBACK :
txStatusStr = "TX_STATUS_MARKED_ROLLBACK";
break;
case Status.STATUS_NO_TRANSACTION :
txStatusStr = "TX_STATUS_NO_TRANSACTION";
break;
case Status.STATUS_PREPARED :
txStatusStr = "TX_STATUS_PREPARED";
break;
case Status.STATUS_PREPARING :
txStatusStr = "TX_STATUS_PREPARING";
break;
case Status.STATUS_ROLLEDBACK :
txStatusStr = "TX_STATUS_ROLLEDBACK";
break;
case Status.STATUS_ROLLING_BACK :
txStatusStr = "TX_STATUS_ROLLING_BACK";
break;
case Status.STATUS_UNKNOWN :
txStatusStr = "TX_STATUS_UNKNOWN";
break;
default :
txStatusStr = "UNMATCHED TX STATUS";
break;
}
return txStatusStr;
}
public static String timerStateToString(int state) {
String stateStr = "UNKNOWN_TIMER_STATE";
switch(state) {
case STATE_ACTIVE :
stateStr = "TIMER_ACTIVE";
break;
case STATE_CANCELLED :
stateStr = "TIMER_CANCELLED";
break;
default :
stateStr = "UNKNOWN_TIMER_STATE";
break;
}
return stateStr;
}
//
// This is a global cache of timer data *only for timers owned by
// this server instance*. It is not transactionally
// consistent. Operations requiring those semantics should query
// the database for TimerBean info. Any timer for which there is an
// active JDK timer task must be contained within this cache.
//
// Note : this class supports concurrent access.
//
public static class TimerCache {
// Maps timer id to timer state.
private Map timers_;
// Map of timer information per container.
//
// For stateless session beans and message-driven beans,
// container id is mapped to a Long value representing the
// number of timers.
//
//
// For entity beans, container id is mapped to a list of
// primary keys. NOTE : This list can contain duplicate primary keys
// in the case where the same entity bean identity has more
// than one associated timer.
private Map containerTimers_;
// Map of non-persistent timer id to timer state.
private Map nonpersistentTimers_;
public TimerCache() {
// Create unsynchronized collections. TimerCache will
// provide concurrency control.
timers_ = new HashMap();
containerTimers_ = new HashMap();
nonpersistentTimers_ = new HashMap();
}
public synchronized void addTimer(TimerPrimaryKey timerId,
RuntimeTimerState timerState) {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Adding timer " + timerState);
}
timers_.put(timerId, timerState);
if (!timerState.isPersistent()) {
nonpersistentTimers_.put(timerId, timerState);
}
Long containerId = timerState.getContainerId();
Object containerInfo = containerTimers_.get(containerId);
if( timerState.timedObjectIsEntity() ) {
Collection entityBeans;
if( containerInfo == null ) {
// NOTE : This list *can* contain duplicates, since
// the same entity bean can be the timed object for
// multiple timers.
entityBeans = new ArrayList();
containerTimers_.put(containerId, entityBeans);
} else {
entityBeans = (Collection) containerInfo;
}
entityBeans.add(timerState.getTimedObjectPrimaryKey());
} else {
Long timerCount = (containerInfo == null) ? 1 :
((Long) containerInfo).longValue() + 1;
containerTimers_.put(containerId, timerCount);
}
}
/**
* Remove a timer from the cache. This should be coded
* defensively since it's possible it will be called multiple
* times for the same timer.
*/
public synchronized void removeTimer(TimerPrimaryKey timerId) {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "Removing timer " + timerId);
}
RuntimeTimerState timerState = (RuntimeTimerState)
timers_.remove(timerId);
if( timerState == null) {
return;
}
if (!timerState.isPersistent()) {
nonpersistentTimers_.remove(timerId);
}
Long containerId = timerState.getContainerId();
Object containerInfo = containerTimers_.get(containerId);
if( containerInfo != null ) {
if( timerState.timedObjectIsEntity() ) {
Collection entityBeans = (Collection) containerInfo;
if( entityBeans.size() == 1 ) {
// Only one left -- blow away the container.
containerTimers_.remove(containerId);
} else {
// Remove a single instance of this primary key
// from the list. There could still be other
// instances of the same primary key.
entityBeans.remove
(timerState.getTimedObjectPrimaryKey());
}
} else {
long timerCount = ((Long) containerInfo).longValue();
if( timerCount == 1 ) {
// Only one left -- blow away the container
containerTimers_.remove(containerId);
} else {
Long newCount = timerCount - 1;
containerTimers_.put(containerId, newCount);
}
}
}
}
public synchronized RuntimeTimerState getTimerState(TimerPrimaryKey
timerId) {
return (RuntimeTimerState) timers_.get(timerId);
}
public synchronized RuntimeTimerState getNonPersistentTimerState(
TimerPrimaryKey timerId) {
return (RuntimeTimerState) nonpersistentTimers_.get(timerId);
}
// True if the given entity bean has any timers and false otherwise.
public synchronized boolean entityBeanHasTimers(long containerId,
Object pkey) {
Object containerInfo = containerTimers_.get(containerId);
return (containerInfo != null) ?
((Collection) containerInfo).contains(pkey) : false;
}
// True if the ejb represented by this container id has any timers
// and false otherwise.
public synchronized boolean containerHasTimers(long containerId) {
return containerTimers_.containsKey(containerId);
}
// Placeholder for logic to ensure timer cache consistency.
public synchronized void validate() {
}
// Returns a Set of non-persistent timer ids for this container
public synchronized Set getNonPersistentTimerIdsForContainer(
long containerId_) {
Set result = new HashSet();
for (Map.Entry entry : nonpersistentTimers_.entrySet()) {
TimerPrimaryKey key = entry.getKey();
RuntimeTimerState rt = entry.getValue();
if ((rt.getContainerId() == containerId_)) {
result.add(key);
}
}
return result;
}
// Returns a Set of active non-persistent timer ids for this container
public synchronized Set getNonPersistentActiveTimerIdsForContainer(
long containerId_) {
Set result = new HashSet();
for (Map.Entry entry : nonpersistentTimers_.entrySet()) {
TimerPrimaryKey key = entry.getKey();
RuntimeTimerState rt = entry.getValue();
if ((rt.getContainerId() == containerId_) && rt.isActive()) {
result.add(key);
}
}
return result;
}
// Returns a Set of active non-persistent timer ids for this server
public synchronized Set getNonPersistentActiveTimerIdsByThisServer() {
Set result = new HashSet();
for (Map.Entry entry : nonpersistentTimers_.entrySet()) {
TimerPrimaryKey key = entry.getKey();
RuntimeTimerState rt = entry.getValue();
if (rt.isActive()) {
result.add(key);
}
}
return result;
}
} //TimerCache{}
/**
* This class gets a callback on a worker thread where the actual
* ejbTimeout invocation will be made.
*/
private static class TaskExpiredWork implements Runnable {
private EJBTimerService timerService_;
private TimerPrimaryKey timerId_;
private RequestTracingService requestTracing;
private StuckThreadsStore stuckThreads;
public TaskExpiredWork(EJBTimerService timerService,
TimerPrimaryKey timerId,
RequestTracingService rt, StuckThreadsStore stuckThreadStore) {
timerService_ = timerService;
timerId_ = timerId;
requestTracing = rt;
stuckThreads = stuckThreadStore;
}
@Override
public void run() {
if (stuckThreads != null){
stuckThreads.registerThread(Thread.currentThread().getId());
}
// Delegate to Timer Service.
if (requestTracing != null && requestTracing.isRequestTracingEnabled()){
requestTracing.startTrace();
RequestEvent re = new RequestEvent("EJBTimer-FIRE");
re.addProperty("TimerID", timerId_.toString());
requestTracing.traceRequestEvent(re);
}
try {
timerService_.deliverTimeout(timerId_);
}finally {
if (requestTracing != null && requestTracing.isRequestTracingEnabled() ){
requestTracing.endTrace();
}
if (stuckThreads != null){
stuckThreads.deregisterThread(Thread.currentThread().getId());
}
}
}
} // TaskExpiredWork
private static class TimerSynch implements Synchronization {
private TimerPrimaryKey timerId_;
private int state_;
private Date timeout_;
private BaseContainer container_;
private EJBTimerService timerService_;
public TimerSynch(TimerPrimaryKey timerId, int state, Date timeout,
BaseContainer container, EJBTimerService timerService) {
timerId_ = timerId;
state_ = state;
timeout_ = timeout;
container_ = container;
timerService_ = timerService;
}
public void afterCompletion(int status) {
if( logger.isLoggable(Level.FINE) ) {
logger.log(Level.FINE, "TimerSynch::afterCompletion. " +
"timer state = " + timerStateToString(state_) +
" , " + "timer id = " +
timerId_ + " , JTA TX status = " +
txStatusToString(status) + " , " +
"timeout = " + timeout_);
}
switch(state_) {
case STATE_ACTIVE :
if( status == Status.STATUS_COMMITTED ) {
timerService_.scheduleTask(timerId_, timeout_);
container_.incrementCreatedTimedObject();
} else {
timerService_.expungeTimer(timerId_);
}
break;
case STATE_CANCELLED :
if( status == Status.STATUS_ROLLEDBACK ) {
if( timeout_ != null ) {
// Timer was cancelled while in the SCHEDULED state.
// Just schedule it again with the original timeout.
timerService_.scheduleTask(timerId_, timeout_);
} else {
// Timer was cancelled from within its own ejbTimeout
// and then rolledback.
timerService_.restoreTaskToDelivered(timerId_);
}
} else {
timerService_.expungeTimer(timerId_);
container_.incrementRemovedTimedObject();
}
break;
default :
// do nothing if the state is not one of the above
break;
}
}
public void beforeCompletion() {}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy