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/**
* Copyright (C) 2019 Bonitasoft S.A.
* Bonitasoft, 32 rue Gustave Eiffel - 38000 Grenoble
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation
* version 2.1 of the License.
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
* Floor, Boston, MA 02110-1301, USA.
**/
package org.bonitasoft.engine.classloader;
import java.io.IOException;
import java.net.URI;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeoutException;
import java.util.function.Function;
import java.util.stream.Stream;
import javax.transaction.Status;
import lombok.extern.slf4j.Slf4j;
import org.bonitasoft.engine.commons.NullCheckingUtil;
import org.bonitasoft.engine.dependency.SDependencyException;
import org.bonitasoft.engine.dependency.impl.PlatformDependencyService;
import org.bonitasoft.engine.dependency.impl.TenantDependencyService;
import org.bonitasoft.engine.dependency.model.ScopeType;
import org.bonitasoft.engine.events.EventService;
import org.bonitasoft.engine.events.model.SEvent;
import org.bonitasoft.engine.exception.BonitaRuntimeException;
import org.bonitasoft.engine.home.BonitaHomeServer;
import org.bonitasoft.engine.home.BonitaResource;
import org.bonitasoft.engine.service.BroadcastService;
import org.bonitasoft.engine.service.TaskResult;
import org.bonitasoft.engine.sessionaccessor.STenantIdNotSetException;
import org.bonitasoft.engine.sessionaccessor.SessionAccessor;
import org.bonitasoft.engine.transaction.BonitaTransactionSynchronization;
import org.bonitasoft.engine.transaction.STransactionNotFoundException;
import org.bonitasoft.engine.transaction.UserTransactionService;
import org.springframework.stereotype.Component;
/**
* @author Elias Ricken de Medeiros
* @author Baptiste Mesta
* @author Matthieu Chaffotte
*/
@Slf4j
@Component("classLoaderService") //id used by RefreshClassLoaderTask and @InjectedService
public class ClassLoaderServiceImpl implements ClassLoaderService {
private final Object synchroLock = new Object();
private final ThreadLocal currentRefreshTask = new ThreadLocal<>();
private final ParentClassLoaderResolver parentClassLoaderResolver;
private final Map classLoaders = new ConcurrentHashMap<>();
private final Set platformClassLoaderListeners = new HashSet<>();
private final Map> singleClassLoaderListenersMap = Collections
.synchronizedMap(new HashMap<>());
private boolean shuttingDown = false;
private final EventService eventService;
private final PlatformDependencyService platformDependencyService;
private final Map dependencyServicesByTenant = new HashMap<>();
private final SessionAccessor sessionAccessor;
private final UserTransactionService userTransactionService;
private final BroadcastService broadcastService;
private final ClassLoaderUpdater classLoaderUpdater;
public ClassLoaderServiceImpl(final ParentClassLoaderResolver parentClassLoaderResolver,
final EventService eventService, PlatformDependencyService platformDependencyService,
SessionAccessor sessionAccessor,
UserTransactionService userTransactionService, BroadcastService broadcastService,
ClassLoaderUpdater classLoaderUpdater, List platformClassLoaderListeners) {
this.parentClassLoaderResolver = parentClassLoaderResolver;
this.eventService = eventService;
this.platformDependencyService = platformDependencyService;
this.sessionAccessor = sessionAccessor;
this.userTransactionService = userTransactionService;
this.broadcastService = broadcastService;
this.classLoaderUpdater = classLoaderUpdater;
this.platformClassLoaderListeners.addAll(platformClassLoaderListeners);
}
@Override
public void registerDependencyServiceOfTenant(Long tenantId, TenantDependencyService tenantDependencyService) {
dependencyServicesByTenant.put(tenantId, tenantDependencyService);
}
private void warnOnShuttingDown(final ClassLoaderIdentifier key) {
if (shuttingDown) {
log.warn("Using local classloader on after ClassLoaderService shuttingdown: " + key);
}
}
@Override
public BonitaClassLoader getClassLoader(ClassLoaderIdentifier id) {
NullCheckingUtil.checkArgsNotNull(id);
log.trace("Get classloader {}", id);
warnOnShuttingDown(id);
// when the classloader is initialized, it is done in another thread/transaction
// We might not need to do so.
return getOrInitializeClassloader(id, k -> classLoaderUpdater.initializeClassLoader(this, k));
}
public BonitaClassLoader getOrInitializeClassloader(ClassLoaderIdentifier id,
Function createClassloaderFunction) {
if (!classLoaders.containsKey(id)) {
log.trace("getOrInitializeClassloader: classloader not found {}, it will be created", id);
//computed before to avoid having nested "computeIfAbsent"
BonitaClassLoader newClassLoader = createClassloaderFunction.apply(id);
BonitaClassLoader classLoader = classLoaders.computeIfAbsent(id, k -> newClassLoader);
if (!classLoader.equals(newClassLoader)) {
log.debug("Due to concurrent initialization, the Classloader created here {} will not be used " +
"and will be destroyed. {} is the one that will be used", newClassLoader, classLoader);
newClassLoader.destroy();
}
return classLoader;
} else {
return classLoaders.get(id);
}
}
ClassLoader getParentClassLoader(ClassLoaderIdentifier identifier) {
final ClassLoaderIdentifier parentIdentifier = parentClassLoaderResolver
.getParentClassLoaderIdentifier(identifier);
if (ClassLoaderIdentifier.APPLICATION.equals(parentIdentifier)) {
// Application classloader is the one bootstrapping bonita platform
return ClassLoaderServiceImpl.class.getClassLoader();
} else {
//get or initialize parent in the same thread/transaction
return getOrInitializeClassloader(parentIdentifier, k -> {
try {
return createClassloader(k);
} catch (IOException | SClassLoaderException e) {
throw new BonitaRuntimeException(e);
}
});
}
}
@Override
public void removeLocalClassloader(ClassLoaderIdentifier identifier) throws SClassLoaderException {
NullCheckingUtil.checkArgsNotNull(identifier);
log.debug("Removing local classloader with {}", identifier);
BonitaClassLoader localClassLoader = classLoaders.get(identifier);
if (localClassLoader != null) {
destroyAndRemoveClassLoader(localClassLoader);
notifyDestroyed(localClassLoader);
}
}
private void destroyAndRemoveClassLoader(BonitaClassLoader localClassLoader) throws SClassLoaderException {
if (localClassLoader.hasChildren()) {
throw new SClassLoaderException(
"Unable to delete classloader " + localClassLoader.getIdentifier() + " because it has children: "
+ localClassLoader.getChildren());
}
localClassLoader.destroy();
classLoaders.remove(localClassLoader.getIdentifier());
}
private List getClassLoaderTreeLeavesFirst(BonitaClassLoader root) {
List tree = new ArrayList<>();
for (BonitaClassLoader child : root.getChildren()) {
tree.addAll(getClassLoaderTreeLeavesFirst(child));
}
tree.add(root);
return tree;
}
URI getLocalTemporaryFolder(ClassLoaderIdentifier identifier) throws IOException {
return BonitaHomeServer.getInstance().getLocalTemporaryFolder(identifier.getType().name(), identifier.getId());
}
BonitaClassLoader createClassloader(ClassLoaderIdentifier id) throws IOException, SClassLoaderException {
log.debug("Creating classloader {}", id);
BonitaClassLoader classLoader = BonitaClassLoaderFactory.createClassLoader(getDependencies(id), id,
getLocalTemporaryFolder(id),
getParentClassLoader(id));
log.info("Created classloader {}: {}", id, classLoader);
return classLoader;
}
@Override
public void start() {
log.debug("Starting classloader service, creating the platform classloader");
shuttingDown = false;
//we do not create or destroy the global classloader because it does not point to a bonita classloader
}
@Override
public void stop() {
log.debug("Stopping classloader service, destroying all classloaders");
shuttingDown = true;
destroyAllLocalClassLoaders();
}
private void destroyAllLocalClassLoaders() {
log.debug("Destroying all classloaders");
//remove elements only that don't have children
//there is no loop in this so the algorithm finishes
BonitaClassLoader global = classLoaders.get(ClassLoaderIdentifier.GLOBAL);
if (global == null) {
log.debug("No ClassLoaders to destroy");
return;
}
//destroy classloader starting from the leaves to avoid checking for children
List allClassLoaders = getClassLoaderTreeLeavesFirst(global);
for (BonitaClassLoader currentClassLoader : allClassLoaders) {
currentClassLoader.destroy();
notifyDestroyed(currentClassLoader);
if (classLoaders.remove(currentClassLoader.getIdentifier()) == null) {
log.warn("One classloader of the tree is not present in the list: classloader = {} and list = {}",
currentClassLoader, classLoaders);
}
}
//the classloader map should be empty at this point. Clearing it to ensure that we never reuse old classloader in that case
if (!classLoaders.isEmpty()) {
log.warn("Classloader tree was destroyed but some classloaders were still references in the map {}",
classLoaders);
}
classLoaders.clear();
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public boolean addListener(ClassLoaderIdentifier identifier, SingleClassLoaderListener singleClassLoaderListener) {
log.debug("Added listener {} on {}", singleClassLoaderListener, identifier);
return getListeners(identifier).add(singleClassLoaderListener);
}
@Override
public boolean removeListener(ClassLoaderIdentifier identifier,
SingleClassLoaderListener singleClassLoaderListener) {
log.debug("Removed listener {} on {}", singleClassLoaderListener, identifier);
return getListeners(identifier).remove(singleClassLoaderListener);
}
Set getListeners(ClassLoaderIdentifier identifier) {
return this.singleClassLoaderListenersMap.computeIfAbsent(identifier, k -> new HashSet<>());
}
/**
* Notify listeners that the classloader was destroyed
* That method do not notify children because we can't destroy a classloader that have children
*
* @param classLoader
*/
private void notifyDestroyed(BonitaClassLoader classLoader) {
getListeners(classLoader.getIdentifier()).forEach(l -> {
log.debug("Notify listener that classloader {} was destroyed: {}", classLoader.getIdentifier(), l);
l.onDestroy(classLoader);
});
platformClassLoaderListeners.forEach(l -> {
log.debug("Notify listener that classloader {} was destroyed: {}", classLoader.getIdentifier(), l);
l.onDestroy(classLoader);
});
}
/**
* Notify listeners that the classloader was updated
* Also notify that children classloader were updated
*/
void notifyUpdated(BonitaClassLoader newClassLoader) {
getListeners(newClassLoader.getIdentifier()).forEach(l -> {
log.debug("Notify listener that classloader {} was updated: {}", newClassLoader.getIdentifier(), l);
l.onUpdate(newClassLoader);
});
platformClassLoaderListeners.forEach(l -> {
log.debug("Notify listener that classloader {} was updated: {}", newClassLoader.getIdentifier(), l);
l.onUpdate(newClassLoader);
});
}
@Override
public void refreshClassLoaderImmediatelyWithRollback(ClassLoaderIdentifier identifier)
throws SClassLoaderException {
// Register the rollback before refreshing classloader in case refreshClassLoaderImmediately() fails:
registerAfterCommitClassloaderUpdate(identifier);
refreshClassLoaderImmediately(identifier);
}
@Override
public void refreshClassLoaderImmediately(ClassLoaderIdentifier identifier) throws SClassLoaderException {
try {
log.info("Refreshing classloader {}", identifier);
BonitaClassLoader newClassloader = createClassloader(identifier);
BonitaClassLoader previous = classLoaders.put(identifier, newClassloader);
// Destroy and remove all children classloaders of the `previous` classloader. They need to be recreated
if (previous != null) {
//destroy classloader starting from the leaves to avoid checking for children
for (BonitaClassLoader classLoader : getClassLoaderTreeLeavesFirst(previous)) {
classLoader.destroy();
notifyDestroyed(classLoader);
// remove(key,value) only remove the value if its the one given,
// We do that to avoid removing the one we just added to the map
classLoaders.remove(classLoader.getIdentifier(), classLoader);
}
log.debug("Refreshed classloader {}, {} was replaced by {}", identifier, previous, classLoaders);
} else {
log.debug("Refreshed classloader {}, There was no classloader, classloader set: {}", identifier,
classLoaders);
}
notifyUpdated(newClassloader);
final SEvent event = new SEvent("ClassLoaderRefreshed");
event.setObject(identifier);
eventService.fireEvent(event);
} catch (Exception e) {
throw new SClassLoaderException(e);
}
}
private void registerAfterCommitClassloaderUpdate(ClassLoaderIdentifier identifier) throws SClassLoaderException {
try {
userTransactionService.registerBonitaSynchronization((BonitaTransactionSynchronization) i -> {
if (i != Status.STATUS_COMMITTED) {
try {
log.warn("The transaction was not committed. Refreshing classloader on tenantId "
+ sessionAccessor.getTenantId() + " to return to a clean state.");
classLoaderUpdater.refreshClassloaders(this, sessionAccessor.getTenantId(),
Collections.singleton(identifier));
} catch (STenantIdNotSetException e) {
//sessionAccessor.getTenantId() is called by getDependencies in refreshClassLoaderImmediately
// In other words this should never happen
log.error("Cannot find the tenantID to refresh classloader on. This should not happen.");
throw new BonitaRuntimeException(e);
}
}
});
} catch (STransactionNotFoundException e) {
throw new SClassLoaderException(e);
}
}
Stream getDependencies(ClassLoaderIdentifier identifier) throws SClassLoaderException {
Stream resources;
try {
if (ScopeType.GLOBAL == identifier.getType()) {
resources = platformDependencyService.getDependenciesResources(identifier.getType(),
identifier.getId());
} else {
long tenantId = sessionAccessor.getTenantId();
TenantDependencyService tenantDependencyService = dependencyServicesByTenant.get(tenantId);
if (tenantDependencyService == null) {
log.warn("No dependency service is initialized on tenant {}. Initializing empty classloader",
tenantId);
return Stream.empty();
}
resources = tenantDependencyService.getDependenciesResources(identifier.getType(), identifier.getId());
}
} catch (STenantIdNotSetException | SDependencyException e) {
throw new SClassLoaderException(e);
}
return resources;
}
@Override
public void refreshClassLoaderAfterUpdate(ClassLoaderIdentifier identifier) throws SClassLoaderException {
try {
registerRefreshOnAllNodes(identifier);
} catch (STransactionNotFoundException | STenantIdNotSetException e) {
throw new SClassLoaderException(e);
}
}
@Override
public void refreshClassLoaderOnOtherNodes(ClassLoaderIdentifier identifier) throws SClassLoaderException {
try {
userTransactionService
.registerBonitaSynchronization((BonitaTransactionSynchronization) transactionState -> {
if (transactionState != Status.STATUS_COMMITTED) {
return;
}
Map> execute;
try {
execute = broadcastService.executeOnOthersAndWait(new RefreshClassLoaderTask(identifier),
getTenantId(identifier.getType()));
} catch (TimeoutException | STenantIdNotSetException | ExecutionException
| InterruptedException e) {
throw new BonitaRuntimeException(e);
}
for (Map.Entry> resultEntry : execute.entrySet()) {
if (resultEntry.getValue().isError()) {
throw new IllegalStateException(resultEntry.getValue().getThrowable());
}
}
});
} catch (STransactionNotFoundException e) {
throw new SClassLoaderException(e);
}
}
private void registerRefreshOnAllNodes(ClassLoaderIdentifier identifier)
throws STransactionNotFoundException, STenantIdNotSetException {
synchronized (synchroLock) {
RefreshClassloaderSynchronization refreshTaskSynchronization = currentRefreshTask.get();
if (refreshTaskSynchronization == null) {
RefreshClassLoaderTask callable = new RefreshClassLoaderTask(identifier);
refreshTaskSynchronization = new RefreshClassloaderSynchronization(this, broadcastService, callable,
classLoaderUpdater, getTenantId(identifier.getType()), identifier);
userTransactionService.registerBonitaSynchronization(refreshTaskSynchronization);
currentRefreshTask.set(refreshTaskSynchronization);
} else {
refreshTaskSynchronization.addClassloaderToRefresh(identifier);
}
}
}
private Long getTenantId(ScopeType type) throws STenantIdNotSetException {
Long tenantId = null;
if (ScopeType.GLOBAL != type) {
tenantId = sessionAccessor.getTenantId();
}
return tenantId;
}
@Override
public void removeRefreshClassLoaderSynchronization() {
currentRefreshTask.remove();
}
}
