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package com.sun.ejb.containers;
import com.sun.ejb.EjbInvocation;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicLong;
import org.jvnet.hk2.annotations.Service;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.sun.ejb.Container;
import com.sun.logging.LogDomains;
import java.lang.reflect.Method;
import jakarta.ejb.EJBException;
/**
* @author Mahesh Kannan
*/
@Service
public class EjbAsyncInvocationManager {
private static final Logger _logger = LogDomains.getLogger(EjbAsyncInvocationManager.class, LogDomains.EJB_LOGGER);
private AtomicLong invCounter = new AtomicLong();
// Map of Remote Future<> tasks.
private ConcurrentHashMap remoteTaskMap =
new ConcurrentHashMap();
public Future createLocalFuture(EjbInvocation inv) {
return createFuture(inv);
}
public Future createRemoteFuture(EjbInvocation inv, Container container, GenericEJBHome ejbHome) {
// Create future but only use the local task to register in the
// remote task map. We'll be replacing the result value with a
// remote future task.
EjbFutureTask localFutureTask = (EjbFutureTask) createFuture(inv);
EjbRemoteFutureTask returnFuture = new EjbRemoteFutureTask(inv.getInvId(), ejbHome);
// If this is a future task for a remote invocation
// and the method has Future return type, add the
// corresponding local task to the async map.
// TODO Need to work on cleanup logic. Maybe we should store
// this in a per-container data structure so cleanup is automatic
// on container shutdown / undeployment. Otherwise, we need a way to easily
// identify all tasks for a given container for cleanup.
Method m = inv.getMethod();
if( !(m.getReturnType().equals(Void.TYPE))) {
remoteTaskMap.put(inv.getInvId(), localFutureTask);
}
return returnFuture;
}
private Future createFuture(EjbInvocation inv) {
// Always create a Local future task that is associated with the
// invocation.
EjbFutureTask futureTask = new EjbFutureTask(new EjbAsyncTask(), this);
// Assign a unique id to this async task
long invId = invCounter.incrementAndGet();
inv.setInvId(invId);
inv.setEjbFutureTask(futureTask);
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Creating new async future task " + inv);
}
return futureTask;
}
public Future submit(EjbInvocation inv) {
//We need to clone this invocation as submitting
//so that the inv is *NOT* shared between the
//current thread and the executor service thread
EjbInvocation asyncInv = inv.clone();
//EjbInvocation.clone clears the txOpsManager field so getTransactionOperationsManager()
// returns null *after* EjbInvocation.clone(). However, in this case, we do want the original
// TransactionOperationsManager so we explicitly set it after calling clone.
//
//Note: EjbInvocation implements TransactionOperationsManager so we can use asyncInv to
// be the TransactionOperationsManager for the new cloned invocation
asyncInv.setTransactionOperationsManager(asyncInv);
//In most of the cases we don't want registry entries from being reused in the cloned
// invocation, in which case, this method must be called. I am not sure if async
// ejb invocation must call this (It never did and someone in ejb team must investigate
// if clearRegistry() must be called from here)
inv.clearYetToSubmitStatus();
asyncInv.clearYetToSubmitStatus();
EjbFutureTask futureTask = asyncInv.getEjbFutureTask();
// EjbAsyncTask.initialize captures calling thread's
// CallerPrincipal and sets it on the dispatch thread
// before authorization.
futureTask.getEjbAsyncTask().initialize(asyncInv);
EjbContainerUtil ejbContainerUtil = EjbContainerUtilImpl.getInstance();
return ejbContainerUtil.getThreadPoolExecutor(null).submit(futureTask.getEjbAsyncTask());
}
public void cleanupContainerTasks(Container container) {
Set> entrySet = remoteTaskMap.entrySet();
Iterator> iterator = entrySet.iterator();
List removedTasks = new ArrayList();
while(iterator.hasNext()) {
Map.Entry next = iterator.next();
EjbAsyncTask task = next.getValue().getEjbAsyncTask();
if( task.getEjbInvocation().container == container ) {
removedTasks.add(task.getInvId());
if( _logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE, "Cleaning up async task " + task.getFutureTask());
}
// TODO Add some additional checking here for in-progress
// tasks.
iterator.remove();
}
}
_logger.log(Level.FINE, "Cleaning up " + removedTasks.size() + "async tasks for " +
"EJB " + container.getEjbDescriptor().getName() + " . Total of " +
remoteTaskMap.size() + " remaining");
return;
}
RemoteAsyncResult remoteCancel(Long asyncTaskID) {
EjbFutureTask task = getLocalTaskForID(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
EjbAsyncTask asyncTask = task.getEjbAsyncTask();
_logger.log(Level.FINE, "Enter remoteCancel for async task " + asyncTaskID +
" : " + asyncTask.getEjbInvocation());
}
RemoteAsyncResult result = null;
if( task.isDone() ) {
// Since the task is done just return the result on this
// internal remote request.
result = new RemoteAsyncResult();
result.resultException = task.getResultException();
result.resultValue = task.getResultValue();
result.asyncID = asyncTaskID;
// The client object won't make another request once it
// has the result so we can remove it from the container map.
remoteTaskMap.remove(asyncTaskID);
} else {
// Set flag on invocation so bean method has visibility to
// the fact that client called cancel()
EjbInvocation inv = task.getEjbAsyncTask().getEjbInvocation();
inv.setWasCancelCalled(true);
}
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Exit remoteCancel for async task " + asyncTaskID +
" : " + task);
}
return result;
}
RemoteAsyncResult remoteIsDone(Long asyncTaskID) {
EjbFutureTask task = getLocalTaskForID(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
EjbAsyncTask asyncTask = task.getEjbAsyncTask();
_logger.log(Level.FINE, "Enter remoteisDone for async task " + asyncTaskID +
" : " + asyncTask.getEjbInvocation());
}
// If not done, just return null.
RemoteAsyncResult result = null;
if( task.isDone() ) {
// Since the task is done just return the result on this
// internal remote request.
result = new RemoteAsyncResult();
result.resultException = task.getResultException();
result.resultValue = task.getResultValue();
result.asyncID = asyncTaskID;
// The client object won't make another request once it
// has the result so we can remove it from the container map.
remoteTaskMap.remove(asyncTaskID);
}
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Exit remoteIsDone for async task " + asyncTaskID +
" : " + task);
}
return result;
}
RemoteAsyncResult remoteGet(Long asyncTaskID) {
EjbFutureTask task = getLocalTaskForID(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Enter remoteGet for async task " + asyncTaskID +
" : " + task.getEjbAsyncTask().getEjbInvocation());
}
RemoteAsyncResult result = new RemoteAsyncResult();
result.asyncID = asyncTaskID;
try {
result.resultValue = task.get();
} catch(Throwable t) {
result.resultException = t;
}
remoteTaskMap.remove(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Exit remoteGet for async task " + asyncTaskID +
" : " + task);
}
return result;
}
RemoteAsyncResult remoteGetWithTimeout(Long asyncTaskID, Long timeout, TimeUnit unit)
throws TimeoutException {
EjbFutureTask task = getLocalTaskForID(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Enter remoteGetWithTimeout for async task " + asyncTaskID +
" timeout=" + timeout + " , unit=" + unit + " : " +
task.getEjbAsyncTask().getEjbInvocation());
}
RemoteAsyncResult result = new RemoteAsyncResult();
result.asyncID = asyncTaskID;
try {
result.resultValue = task.get(timeout, unit);
} catch(TimeoutException to) {
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "TimeoutException for async task " + asyncTaskID +
" : " + task);
}
throw to;
} catch(Throwable t) {
result.resultException = t;
}
// As long as we're not throwing a TimeoutException, just remove the task
// from the map.
remoteTaskMap.remove(asyncTaskID);
if( _logger.isLoggable(Level.FINE) ) {
_logger.log(Level.FINE, "Exit remoteGetWithTimeout for async task " + asyncTaskID +
" : " + task);
}
return result;
}
private EjbFutureTask getLocalTaskForID(Long asyncTaskID) {
EjbFutureTask task = remoteTaskMap.get(asyncTaskID);
if( task == null ) {
_logger.log(Level.FINE, "Could not find async task for ID " + asyncTaskID);
throw new EJBException("Could not find Local Async task corresponding to ID " +
asyncTaskID);
}
return task;
}
}
