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/**
* Copyright (C) 2020 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.tenant;
import static java.text.MessageFormat.format;
import static org.bonitasoft.engine.classloader.ClassLoaderIdentifier.identifier;
import static org.bonitasoft.engine.tenant.TenantServicesManager.ServiceAction.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.Callable;
import org.bonitasoft.engine.classloader.ClassLoaderService;
import org.bonitasoft.engine.commons.TenantLifecycleService;
import org.bonitasoft.engine.commons.exceptions.SBonitaException;
import org.bonitasoft.engine.commons.exceptions.SLifecycleException;
import org.bonitasoft.engine.dependency.model.ScopeType;
import org.bonitasoft.engine.service.RunnableWithException;
import org.bonitasoft.engine.session.SessionService;
import org.bonitasoft.engine.sessionaccessor.SessionAccessor;
import org.bonitasoft.engine.transaction.TransactionService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
/**
* Handles the lifecycle of tenant services: start, stop, (pause, resume -> will be removed)
* Does not handle state of the tenant in database
*/
@Component
public class TenantServicesManager {
private static final Logger LOGGER = LoggerFactory.getLogger(TenantServicesManager.class);
public enum ServiceAction {
START, STOP, PAUSE, RESUME
}
public enum TenantServiceState {
STOPPED, STARTING, STARTED, STOPPING, ABORTING_START
}
private final SessionAccessor sessionAccessor;
private final SessionService sessionService;
private final TransactionService transactionService;
private final ClassLoaderService classLoaderService;
private List services;
private final Long tenantId;
private final TenantElementsRestarter tenantElementsRestarter;
private TenantServiceState tenantServiceState = TenantServiceState.STOPPED;
public TenantServicesManager(SessionAccessor sessionAccessor, SessionService sessionService,
TransactionService transactionService, ClassLoaderService classLoaderService,
List services, @Value("${tenantId}") Long tenantId,
TenantElementsRestarter tenantElementsRestarter) {
this.sessionAccessor = sessionAccessor;
this.sessionService = sessionService;
this.transactionService = transactionService;
this.classLoaderService = classLoaderService;
this.services = services;
this.tenantId = tenantId;
this.tenantElementsRestarter = tenantElementsRestarter;
}
public boolean isStarted() {
return tenantServiceState == TenantServiceState.STARTED;
}
private void updateState(TenantServiceState tenantServiceState) {
LOGGER.debug("Tenant services state updated to {}", tenantServiceState);
this.tenantServiceState = tenantServiceState;
}
public void start() throws Exception {
doStart(START);
}
public void resume() throws Exception {
doStart(RESUME);
}
public void stop() throws Exception {
// stop the tenant services:
doStop(STOP);
}
public void pause() throws Exception {
doStop(PAUSE);
}
public void initServices() throws Exception {
inTenantSession(() -> transactionService.executeInTransaction((Callable) () -> {
for (TenantLifecycleService tenantService : services) {
LOGGER.info("Initializing service {} of tenant {}", tenantService.getClass().getName(), tenantId);
tenantService.init();
}
return null;
}));
}
private void doStart(ServiceAction startAction) throws Exception {
LOGGER.debug("Starting services of tenant {}", tenantId);
if (tenantServiceState != TenantServiceState.STOPPED) {
LOGGER.debug("Tenant services cannot be started, they are {}", tenantServiceState);
return;
}
updateState(TenantServiceState.STARTING);
try {
inTenantSession(() -> {
tenantElementsRestarter.prepareRestartOfElements();
transactionService.executeInTransaction((Callable) () -> {
executeInClassloader(() -> startServices(startAction));
return null;
});
});
} catch (Exception e) {
abortStart(startAction, e);
throw new SLifecycleException(
"Unable to " + startAction + " a service. All services are STOPPED again. Error: " + e.getMessage(),
e);
}
updateState(TenantServiceState.STARTED);
inTenantSession(tenantElementsRestarter::restartElements);
LOGGER.debug("Services of tenant {} are started.", tenantId);
}
private void startServices(ServiceAction startAction) throws SLifecycleException {
for (TenantLifecycleService tenantService : services) {
try {
LOGGER.info("{} tenant-level service {} on tenant with ID {}", startAction,
tenantService.getClass().getName(), tenantId);
if (startAction == RESUME) {
tenantService.resume();
} else {
tenantService.start();
}
} catch (Exception e) {
LOGGER.error("Error while executing the {} of the service {}", startAction,
tenantService.getClass().getName());
throw new SLifecycleException(
format("Error while executing the {0} of the service {1}: {2}", startAction,
transactionService.getClass().getName(), e.getMessage()),
e);
}
}
}
private void abortStart(ServiceAction startAction, Exception e) {
updateState(TenantServiceState.ABORTING_START);
ServiceAction stopAction = startAction == START ? STOP : PAUSE;
try {
LOGGER.info("Stopping tenant services after a failed {}...", startAction);
doStop(stopAction);
} catch (Exception exceptionOnStop) {
LOGGER.warn("Unable to {} tenant services to recover from exception when executing {} because {}: {}",
stopAction, startAction, e.getClass().getName(), e.getMessage());
LOGGER.debug("Caused by: ", exceptionOnStop);
}
}
private void doStop(ServiceAction stopAction) throws Exception {
LOGGER.debug("Stopping services of tenant {}", tenantId);
if (tenantServiceState != TenantServiceState.STARTED
&& tenantServiceState != TenantServiceState.ABORTING_START) {
LOGGER.debug("Tenant services cannot be stopped, they are {}", tenantServiceState);
return;
}
updateState(TenantServiceState.STOPPING);
List list = new ArrayList<>(services);
Collections.reverse(list);
Optional firstIssue = transactionService
.executeInTransaction(
() -> list.stream()
.map(tenantService -> {
LOGGER.info("{} tenant-level service {} on tenant with ID {}", stopAction,
tenantService.getClass().getName(), tenantId);
try {
if (stopAction == PAUSE) {
tenantService.pause();
} else {
tenantService.stop();
}
} catch (final Exception e) {
LOGGER.error("Error executing the {} of the service {} because: {} {}",
stopAction, tenantService.getClass().getName(), e.getClass().getName(),
e.getMessage());
LOGGER.debug("Cause", e);
return e;
}
return null;
}).filter(Objects::nonNull).findFirst());
updateState(TenantServiceState.STOPPED);
LOGGER.debug("Services of tenant {} are stopped.", tenantId);
if (firstIssue.isPresent()) {
throw new SLifecycleException("Unable to stop some services", firstIssue.get());
}
}
private void executeInClassloader(RunnableWithException runnable) throws Exception {
final ClassLoader baseClassLoader = Thread.currentThread().getContextClassLoader();
try {
// Set the right classloader only on start and resume because we destroy it on stop and pause anyway
final ClassLoader serverClassLoader = classLoaderService.getClassLoader(
identifier(ScopeType.TENANT, tenantId));
Thread.currentThread().setContextClassLoader(serverClassLoader);
runnable.run();
} finally {
// reset previous class loader:
Thread.currentThread().setContextClassLoader(baseClassLoader);
}
}
protected Long createSession(final long tenantId, final SessionService sessionService) throws SBonitaException {
return sessionService.createSession(tenantId, SessionService.SYSTEM).getId();
}
private void inTenantSession(RunnableWithException runnable) throws Exception {
if (sessionAccessor.isTenantSession()) {
runnable.run();
} else { // is a platform session: create a tenant session to run that
long currentSessionId = sessionAccessor.getSessionId();
try {
final long sessionId = createSession(tenantId, sessionService);
sessionAccessor.deleteSessionId();
sessionAccessor.setSessionInfo(sessionId, tenantId);
runnable.run();
sessionService.deleteSession(sessionId);
} finally {
sessionAccessor.setSessionInfo(currentSessionId, -1);
}
}
}
}
