org.eclipse.persistence.sessions.broker.SessionBroker Maven / Gradle / Ivy
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/*
* Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
// stardif - ClientSession broker ServerSession and change propagation additions
package org.eclipse.persistence.sessions.broker;
import java.util.*;
import java.io.Writer;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.descriptors.partitioning.PartitioningPolicy;
import org.eclipse.persistence.exceptions.*;
import org.eclipse.persistence.history.*;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.sequencing.Sequence;
import org.eclipse.persistence.sessions.ExternalTransactionController;
import org.eclipse.persistence.sessions.SessionProfiler;
import org.eclipse.persistence.internal.databaseaccess.*;
import org.eclipse.persistence.internal.identitymaps.*;
import org.eclipse.persistence.sessions.server.*;
import org.eclipse.persistence.internal.sequencing.SequencingHome;
import org.eclipse.persistence.internal.sequencing.Sequencing;
import org.eclipse.persistence.internal.sequencing.SequencingFactory;
import org.eclipse.persistence.internal.sessions.*;
/**
*
* Purpose: Provide a single view to a TopLink session that transparently accesses multple databases.
*
* Responsibilities:
*
* - Broker queries to the appropriate child sessions.
*
- Use a simplified two-stage commit policy on commit of transaction.
*
- Support brokered units of work.
*
*/
public class SessionBroker extends DatabaseSessionImpl {
protected SessionBroker parent;
protected Map, String> sessionNamesByClass;
protected Map sessionsByName;
protected Sequencing sequencing;
protected boolean shouldUseDescriptorAliases;
/**
* PUBLIC:
* Create and return a session broker.
* Because a session broker has multiple sessions it does not used a login.
*/
public SessionBroker() {
super(new org.eclipse.persistence.sessions.DatabaseLogin());
this.sessionsByName = new HashMap<>();
this.sessionNamesByClass = new HashMap<>();
}
/**
* INTERNAL:
* Create and return a session broker.
* Used internally to set the Names by Class from the parent. Reduces garbage.
*/
protected SessionBroker(Map sessionNames) {
super(new org.eclipse.persistence.sessions.DatabaseLogin());
this.sessionsByName = new HashMap<>();
this.sessionNamesByClass = sessionNames;
}
/**
* PUBLIC:
* Return a session broker that behaves as a client session broker. An
* acquire session broker is done under the covers on each session inside
* the session broker, and a new broker is returned.
*
* NOTE: when finished with the client broker, it should be released.
*/
public SessionBroker acquireClientSessionBroker() {
return acquireClientSessionBroker(null, null);
}
/**
* PUBLIC:
* Return a session broker that behaves as a client session broker. An
* acquire session broker is done under the covers on each session inside
* the session broker, and a new broker is returned.
*
* NOTE: when finished with the client broker, it should be released.
* @param connectionPolicies maps session name to connectionPolicy to be used for this session;
* @param mapOfProperties maps session name to properties to be used for this session.
*/
public SessionBroker acquireClientSessionBroker(Map connectionPolicies, Map mapOfProperties) {
log(SessionLog.FINER, SessionLog.CONNECTION, "acquire_client_session_broker");
SessionBroker clientBroker = copySessionBroker();
clientBroker.parent = this;
clientBroker.getIdentityMapAccessorInstance().setIdentityMapManager(getIdentityMapAccessorInstance().getIdentityMapManager());
clientBroker.commitManager = getCommitManager();
clientBroker.commandManager = getCommandManager();
clientBroker.externalTransactionController = getExternalTransactionController();
clientBroker.setServerPlatform(getServerPlatform());
String sessionName;
AbstractSession session;
Iterator names = this.getSessionsByName().keySet().iterator();
while (names.hasNext()) {
sessionName = names.next();
session = getSessionForName(sessionName);
if (session.isServerSession()) {
ServerSession serverSession = (ServerSession)session;
if (serverSession.getProject().hasIsolatedCacheClassWithoutUOWIsolation()) {
throw ValidationException.isolatedDataNotSupportedInSessionBroker(sessionName);
}
ConnectionPolicy connectionPolicy = null;
if (connectionPolicies != null) {
connectionPolicy = connectionPolicies.get(sessionName);
}
if (connectionPolicy == null) {
connectionPolicy = serverSession.getDefaultConnectionPolicy();
}
Map properties = null;
if (mapOfProperties != null) {
properties = (Map)mapOfProperties.get(sessionName);
}
clientBroker.registerSession(sessionName, serverSession.acquireClientSession(connectionPolicy, properties));
} else {
throw ValidationException.cannotAcquireClientSessionFromSession();
}
}
clientBroker.initializeSequencing();
return clientBroker;
}
/**
* INTERNAL:
* Acquires a special historical session for reading objects as of a past time.
*/
@Override
public org.eclipse.persistence.sessions.Session acquireHistoricalSession(AsOfClause clause) throws ValidationException {
if (isServerSessionBroker()) {
throw ValidationException.cannotAcquireHistoricalSession();
}
// ? logMessage("acquire_client_session_broker", (Object[])null);
SessionBroker historicalBroker = copySessionBroker();
historicalBroker.parent = this;
String sessionName;
AbstractSession session;
Iterator names = this.getSessionsByName().keySet().iterator();
while (names.hasNext()) {
sessionName = names.next();
session = getSessionForName(sessionName);
historicalBroker.registerSession(sessionName, (AbstractSession)session.acquireHistoricalSession(clause));
}
return historicalBroker;
}
/**
* INTERNAL:
* Called in the end of beforeCompletion of external transaction sychronization listener.
* Close the managed sql connection corresponding to the external transaction,
* if applicable releases accessor.
*/
@Override
public void releaseJTSConnection() {
RuntimeException exception = null;
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
try {
session.releaseJTSConnection();
} catch (RuntimeException ex) {
if (exception == null) {
exception = ex;
}
}
}
if (exception != null) {
throw exception;
}
}
/**
* PUBLIC:
* Return a unit of work for this session broker.
* Acquire a client session broker if is a server session broker.
*
* @see UnitOfWorkImpl
*/
@Override
public UnitOfWorkImpl acquireUnitOfWork() {
if (isServerSessionBroker()) {
return acquireClientSessionBroker().acquireUnitOfWork();
} else {
return super.acquireUnitOfWork();
}
}
/**
* PUBLIC:
* You cannot add a descriptor to a session broker, you must add it to its session.
*/
@Override
public void addDescriptor(ClassDescriptor descriptor) {
throw ValidationException.cannotAddDescriptorsToSessionBroker();
}
/**
* PUBLIC:
* You cannot add descriptors to a session broker, you must add them to its session.
*/
public void addDescriptors(Vector descriptors) throws ValidationException {
throw ValidationException.cannotAddDescriptorsToSessionBroker();
}
/**
* PUBLIC:
* You cannot add a project to a session broker, you must add it to its session.
*/
@Override
public void addDescriptors(org.eclipse.persistence.sessions.Project project) throws ValidationException {
throw ValidationException.cannotAddDescriptorsToSessionBroker();
}
/**
* PUBLIC:
* You cannot add a sequence to a session broker, you must add it to its session.
*/
@Override
public void addSequence(Sequence sequence) {
throw ValidationException.cannotAddSequencesToSessionBroker();
}
/**
* INTERNAL:
* Begin the transaction on all child sessions.
*/
@Override
protected void basicBeginTransaction() throws DatabaseException {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.beginTransaction();
}
}
/**
* INTERNAL:
* Commit the transaction on all child sessions.
* This assumes that the commit of the transaction will not fail because all of the
* modification has already taken place and no errors would have occurred.
*/
@Override
protected void basicCommitTransaction() throws DatabaseException {
// Do one last check it make sure that all sessions are still connected.
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
if (!session.isConnected()) {
throw DatabaseException.databaseAccessorNotConnected();
}
}
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.commitTransaction();
}
}
/**
* INTERNAL:
* Rollback the transaction on all child sessions.
*/
@Override
protected void basicRollbackTransaction() throws DatabaseException {
DatabaseException globalException = null;
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
try {
session.rollbackTransaction();
} catch (DatabaseException exception) {
globalException = exception;
}
}
if (globalException != null) {
throw globalException;
}
}
/**
* PUBLIC:
* Return true if the pre-defined query is defined on the session.
*/
@Override
public boolean containsQuery(String queryName) {
boolean containsQuery = getQueries().containsKey(queryName);
if (isClientSessionBroker() && (containsQuery == false)) {
String sessionName = null;
AbstractSession ssession = null;
Iterator names = this.getSessionsByName().keySet().iterator();
while (names.hasNext()) {
sessionName = names.next();
ssession = getSessionForName(sessionName);
if (ssession instanceof org.eclipse.persistence.sessions.server.ClientSession) {
if (((ClientSession)ssession).getParent().getBroker().containsQuery(queryName)) {
return true;
}
}
}
}
return containsQuery;
}
/**
* INTERNAL:
* Return a copy (not using clone) of a session broker.
*/
protected SessionBroker copySessionBroker() {
SessionBroker broker = new SessionBroker(getSessionNamesByClass());
broker.accessors = getAccessors();
broker.name = getName();
broker.isLoggingOff = isLoggingOff();
broker.sessionLog = getSessionLog();
broker.profiler = getProfiler();
broker.isInProfile = isInProfile();
broker.project = project;
if (hasEventManager()) {
broker.eventManager = getEventManager().clone(broker);
}
broker.exceptionHandler = getExceptionHandler();
broker.descriptors = getDescriptors();
broker.shouldPropagateChanges = shouldPropagateChanges;
return broker;
}
/**
* INTERNAL:
* Return the low-level database accessors.
* The database accessor is used for direct database access.
* The right accessor for this broker will be returned.
*/
@Override
public Collection getAccessors(Call call, AbstractRecord translationRow, DatabaseQuery query) {
if (query.getSessionName() != null) {
return getSessionForName(query.getSessionName()).getAccessors(call, translationRow, query);
}
if (query.getReferenceClass() == null) {
// CR#... this occurs if a data query is used without a session-name, needs to throw an error
throw QueryException.unnamedQueryOnSessionBroker(null);
}
//session may be a broker too. Eventually a non session broker will be found
return getSessionForClass(query.getReferenceClass()).getAccessors(call, translationRow, query);
}
/**
* ADVANCED:
* Answers the past time this session is as of. Only meaningful
* for special historical sessions.
* @return An immutable object representation of the past time.
* null if no clause set, or this a regular session.
* @see AsOfClause
* @see #acquireHistoricalSession(AsOfClause)
* @see org.eclipse.persistence.expressions.Expression#hasAsOfClause Expression.hasAsOfClause()
*/
@Override
public AsOfClause getAsOfClause() {
for (Iterator enumtr = getSessionsByName().values().iterator(); enumtr.hasNext();) {
return enumtr.next().getAsOfClause();
}
return null;
}
/**
* INTERNAL:
* Gets the parent SessionBroker.
*/
@Override
public SessionBroker getParent() {
return parent;
}
/**
* INTERNAL:
* Gets the session which this query will be executed on.
* Generally will be called immediately before the call is translated,
* which is immediately before session.executeCall.
*
* Since the execution session also knows the correct datasource platform
* to execute on, it is often used in the mappings where the platform is
* needed for type conversion, or where calls are translated.
*
* Is also the session with the accessor. Will return a ClientSession if
* it is in transaction and has a write connection.
* @return a session with a live accessor
* @param query may store session name or reference class for brokers case
*/
@Override
public AbstractSession getExecutionSession(DatabaseQuery query) {
AbstractSession sessionByQuery = getSessionForQuery(query);
// Always forward to a registered session.
return sessionByQuery.getExecutionSession(query);
}
/**
* INTERNAL:
* Return the platform for a particular class.
*/
@Override
public Platform getPlatform(Class domainClass) {
if (domainClass == null) {
return super.getDatasourcePlatform();
}
//else
return getSessionForClass(domainClass).getDatasourcePlatform();
}
/**
* PUBLIC:
* Return the query from the session pre-defined queries with the given name and argument types.
* This allows for common queries to be pre-defined, reused and executed by name.
* This method should be used if the Session has multiple queries with the same name but
* different arguments.
*
* The search order is:
* for ClientSessionBroker:
* the broker;
* it's member ClientSessions (but not their parent ServerSessions);
* the parent SessionBroker.
*
* for ServerSession or DatabaseSession SessionBroker:
* the broker;
* it's member ServerSessions (or DatabaseSessions).
*/
//Bug#3551263 Override getQuery(String name, Vector arguments) in Session search through
//the server session broker as well
@Override
public DatabaseQuery getQuery(String name, Vector arguments, boolean shouldSearchParent) {
// First search the broker
DatabaseQuery query = super.getQuery(name, arguments, shouldSearchParent);
if(query != null) {
return query;
}
Iterator it = this.sessionsByName.values().iterator();
while(it.hasNext()) {
// Note that ClientSession's parent ServerSessions should not be searched at this time
query = it.next().getQuery(name, arguments, false);
if(query != null) {
return query;
}
}
if(shouldSearchParent) {
AbstractSession parent = getParent();
if(parent != null) {
// Search SessionBroker and it's member ServerSessions
return parent.getQuery(name, arguments, true);
}
}
return null;
}
/**
* INTERNAL:
* Return the session to be used for the class.
*/
@Override
public AbstractSession getSessionForClass(Class domainClass) throws ValidationException {
if (domainClass == null) {
// CR2114; we don't have a session name. Return us.
return this;
}
String sessionName = getSessionNamesByClass().get(domainClass);
if (sessionName == null) {
throw ValidationException.noSessionRegisteredForClass(domainClass);
}
return getSessionsByName().get(sessionName);
}
/**
* INTERNAL:
* Return the session by name.
*/
@Override
public AbstractSession getSessionForName(String name) throws ValidationException {
AbstractSession sessionByName = getSessionsByName().get(name);
if (sessionByName == null) {
throw ValidationException.noSessionRegisteredForName(name);
}
return sessionByName;
}
/**
* INTERNAL:
* Answers the session to be used for the given query.
*/
protected AbstractSession getSessionForQuery(DatabaseQuery query) {
if (query.hasSessionName()) {
return getSessionForName(query.getSessionName());
}
Class queryClass;
if (query.getDescriptor() != null) {
queryClass = query.getDescriptor().getJavaClass();
} else {
queryClass = query.getReferenceClass();
if (queryClass == null) {
throw QueryException.unnamedQueryOnSessionBroker(query);
}
}
return getSessionForClass(queryClass);
}
/**
* INTERNAL:
* Return sessions indexed by class, each class can only have one default session.
*/
protected Map, String> getSessionNamesByClass() {
return sessionNamesByClass;
}
/**
* INTERNAL:
* Return sessions indexed by name.
*/
public Map getSessionsByName() {
return sessionsByName;
}
/**
* INTERNAL:
* Allow each descriptor to initialize any dependencies on this session.
* This is done in two passes to allow the inheritance to be resolved first.
* Normally the descriptors are added before login, then initialized on login.
* Should not be called on client SessoionBroker
*/
@Override
public void initializeDescriptors() {
// ClientSession initializes sequencing during construction,
// however DatabaseSession and ServerSession normally call initializeSequencing()
// in initializeDescriptors method.
// Because initializeDescriptors() is not called for a session-member of a SessionBroker,
// initializeSequencing() for the sessions should be called here.
for (Iterator enumtr = getSessionsByName().values().iterator(); enumtr.hasNext();) {
DatabaseSessionImpl databaseSession = (DatabaseSessionImpl)enumtr.next();
String sessionName = databaseSession.getName();
// Initialize partitioning policies.
for (PartitioningPolicy policy : databaseSession.getProject().getPartitioningPolicies().values()) {
policy.initialize(this);
}
// Copy jpa queries from member sessions into SessionBroker before descriptors' initialization.
if (!databaseSession.isJPAQueriesProcessed()) {
for(DatabaseQuery query: databaseSession.getJPAQueries()) {
query.setSessionName(sessionName);
getJPAQueries().add(query);
}
//prevent them from being re-added in the case of a logout/login
databaseSession.setJPAQueriesProcessed(true);
}
// assign session name to each query
Iterator> it = databaseSession.getQueries().values().iterator();
while(it.hasNext()) {
List queryList = it.next();
for(int i=0; i < queryList.size(); i++) {
queryList.get(i).setSessionName(sessionName);
}
}
databaseSession.initializeSequencing();
}
if(hasExternalTransactionController()) {
getExternalTransactionController().initializeSequencingListeners();
}
super.initializeDescriptors();
// Must reset project options to session broker project, as initialization occurs
// with local projects.
for (Iterator enumtr = getSessionsByName().values().iterator(); enumtr.hasNext();) {
DatabaseSessionImpl databaseSession = (DatabaseSessionImpl)enumtr.next();
if (databaseSession.getProject().hasGenericHistorySupport()) {
getProject().setHasGenericHistorySupport(true);
}
if (databaseSession.getProject().hasIsolatedClasses()) {
getProject().setHasIsolatedClasses(true);
}
if (databaseSession.getProject().hasMappingsPostCalculateChangesOnDeleted()) {
getProject().setHasMappingsPostCalculateChangesOnDeleted(true);
}
if (databaseSession.getProject().hasNonIsolatedUOWClasses()) {
getProject().setHasNonIsolatedUOWClasses(true);
}
if (databaseSession.getProject().hasProxyIndirection()) {
getProject().setHasProxyIndirection(true);
}
getProject().getDefaultReadOnlyClasses().addAll(databaseSession.getProject().getDefaultReadOnlyClasses());
}
// ServerSessionBroker doesn't need sequencing.
// Sequencing should be obtained either from the ClientSessionBroker or directly
// from the ClientSession.
if (isServerSessionBroker()) {
sequencing = null;
}
}
/**
* INTERNAL:
* Set up the IdentityMapManager. This method allows subclasses of Session to override
* the default IdentityMapManager functionality.
*/
@Override
public void initializeIdentityMapAccessor() {
this.identityMapAccessor = new SessionBrokerIdentityMapAccessor(this, new IdentityMapManager(this));
}
/**
* INTERNAL:
* Return the results from exeucting the database query.
* the arguments should be a database row with raw data values.
* Find the correct child session to broker the query to,
* and return the result of the session executing the query.
*/
@Override
public Object internalExecuteQuery(DatabaseQuery query, AbstractRecord row) throws DatabaseException, QueryException {
AbstractSession sessionByQuery = getSessionForQuery(query);
// Note, this disables local profilers.
return sessionByQuery.internalExecuteQuery(query, row);
}
/**
* INTERNAL:
* Returns true if the session is a session Broker.
*/
@Override
public boolean isBroker() {
return true;
}
/**
* PUBLIC:
* Return if this session is a client session broker.
*/
public boolean isClientSessionBroker() {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
if (session.isClientSession()) {
return true;
}
}
return false;
}
/**
* PUBLIC:
* Return if all sessions are still connected to the database.
*/
@Override
public boolean isConnected() {
if ((getSessionsByName() == null) || (getSessionsByName().isEmpty())) {
return false;
}
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
if (!session.isConnected()) {
return false;
}
}
return true;
}
/**
* PUBLIC:
* Return if this session is a server session broker.
*/
public boolean isServerSessionBroker() {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
if (session.isServerSession()) {
return true;
}
}
return false;
}
/**
* INTERNAL:
* Return if this session is a session broker.
*/
@Override
public boolean isSessionBroker() {
return true;
}
/**
* PUBLIC:
* Connect to the database using the predefined login.
* This connects all of the child sessions and expects that they are in a valid state to be connected.
*/
@Override
public void login() throws DatabaseException {
preConnectDatasource();
// Connection all sessions and initialize
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
DatabaseSessionImpl session = (DatabaseSessionImpl)sessionEnum.next();
if (!session.isConnected()) {
session.login();
}
}
postConnectDatasource();
}
/**
* PUBLIC:
* Connect to the database using the predefined login.
* During connection, attempt to auto detect the required database platform.
* This method can be used in systems where for ease of use developers have
* EclipseLink autodetect the platform.
* To be safe, however, the platform should be configured directly.
* The login must have been assigned when or after creating the session.
*
*/
@Override
public void loginAndDetectDatasource() throws DatabaseException {
preConnectDatasource();
// Connection all sessions and initialize
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
DatabaseSessionImpl session = (DatabaseSessionImpl)sessionEnum.next();
if (!session.isConnected()) {
if(session.getDatasourcePlatform().getClass().getName().equals("org.eclipse.persistence.platform.database.DatabasePlatform")) {
session.loginAndDetectDatasource();
} else {
session.login();
}
}
}
postConnectDatasource();
}
/**
* PUBLIC:
* Connect to the database using the predefined login.
* This connects all of the child sessions and expects that they are in a valid state to be connected.
*/
@Override
public void login(String userName, String password) throws DatabaseException {
preConnectDatasource();
// Connection all sessions and initialize
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
DatabaseSessionImpl session = (DatabaseSessionImpl)sessionEnum.next();
session.getDatasourceLogin().setUserName(userName);
session.getDatasourceLogin().setPassword(password);
if (!session.isConnected()) {
session.login();
}
}
postConnectDatasource();
}
/**
* PUBLIC:
* Disconnect from all databases.
*
* @exception EclipseLinkException if a transaction is active, you must rollback any active transaction before logout.
* @exception DatabaseException the database will also raise an error if their is an active transaction,
* or a general error occurs.
*/
@Override
public void logout() throws DatabaseException {
if(!isLoggedIn) {
return;
}
if (this.eventManager != null) {
this.eventManager.preLogout(this);
}
if (!isClientSessionBroker()) {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
DatabaseSessionImpl session = (DatabaseSessionImpl)sessionEnum.next();
session.logout();
}
}
this.sequencing = null;
this.isLoggedIn = false;
if (this.eventManager != null) {
this.eventManager.postLogout(this);
}
}
/**
* INTERNAL:
* Rise postLogin events for member sessions and the SessionBroker.
*/
@Override
public void postLogin() {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
DatabaseSessionImpl session = (DatabaseSessionImpl)sessionEnum.next();
session.postLogin();
}
super.postLogin();
}
/**
* PUBLIC:
* Register the session under its name.
* All of the session's descriptors must have already been registered.
* DatabaseSession/ServerSession should not be connected and descriptors should not be initialized.
*/
public void registerSession(String name, AbstractSession session) {
session.setIsInBroker(true);
getSessionsByName().put(name, session);
session.setBroker(this);
session.setName(name);
if (session.isDatabaseSession()) {
if (hasEventManager()) {
// add broker's listeners to member sessions.
// each time a listener added to broker it is added to member sessions, too
// (see SessionEventManager#addListener) therefore at all times
// each member session has all broker's listeners.
session.getEventManager().getListeners().addAll(getEventManager().getListeners());
}
// The keys/classes must also be used as some descriptors may be under multiple classes.
Iterator descriptors = session.getDescriptors().values().iterator();
Iterator> classes = session.getDescriptors().keySet().iterator();
while (descriptors.hasNext()) {
ClassDescriptor descriptor = descriptors.next();
Class descriptorClass = classes.next();
getSessionNamesByClass().put(descriptorClass, name);
if(this.shouldUseDescriptorAliases) {
String alias = descriptor.getAlias();
if(alias != null && alias.length() > 0) {
ClassDescriptor anotherDescriptor = getDescriptorForAlias(alias);
if(anotherDescriptor != null) {
if(anotherDescriptor.getJavaClass() != descriptor.getJavaClass()) {
throw ValidationException.sharedDescriptorAlias(alias, descriptor.getJavaClass().getName(), anotherDescriptor.getJavaClass().getName());
}
}
addAlias(alias, descriptor);
}
}
getDescriptors().put(descriptorClass, descriptor);
}
}
}
/**
* PUBLIC:
* Register the session under its name.
* All of the session's descriptors must have already been registered.
* DatabaseSession/ServerSession should not be connected and descriptors should not be initialized.
*/
public void registerSession(String name, org.eclipse.persistence.sessions.Session session) {
registerSession(name, (AbstractSession)session);
}
/**
* PUBLIC:
* Release the session.
* This does nothing by default, but allows for other sessions such as the ClientSession to do something.
*/
@Override
public void release() {
if (isClientSessionBroker()) {
log(SessionLog.FINER, SessionLog.CONNECTION, "releasing_client_session_broker");
}
RuntimeException exception = null;
AbstractSession session;
for (Iterator enumtr = getSessionsByName().values().iterator(); enumtr.hasNext();) {
session = enumtr.next();
try {
session.release();
} catch (RuntimeException ex) {
if (exception == null) {
exception = ex;
}
}
}
super.release();
if (exception != null) {
throw exception;
}
}
/**
* INTERNAL:
* A query execution failed due to an invalid query.
* Re-connect and retry the query.
*/
@Override
public Object retryQuery(DatabaseQuery query, AbstractRecord row, DatabaseException databaseException, int retryCount, AbstractSession executionSession) {
// If not in a transaction and has a write connection, must release it if invalid.
if (isClientSessionBroker()) {
for (Iterator it = getSessionsByName().values().iterator(); it.hasNext();) {
ClientSession clientSession = (ClientSession)it.next();
clientSession.getParent().releaseInvalidClientSession(clientSession);
}
}
return super.retryQuery(query, row, databaseException, retryCount, executionSession);
}
/**
* INTERNAL:
* Used for JTS integration internally by ServerPlatform.
*/
@Override
public void setExternalTransactionController(ExternalTransactionController externalTransactionController) {
super.setExternalTransactionController(externalTransactionController);
for (AbstractSession session : getSessionsByName().values()) {
DatabaseSessionImpl dbSession = (DatabaseSessionImpl)session;
dbSession.setExternalTransactionController(externalTransactionController);
}
}
/**
* PUBLIC:
* set the integrityChecker. IntegrityChecker holds all the ClassDescriptor Exceptions.
*/
@Override
public void setIntegrityChecker(IntegrityChecker integrityChecker) {
super.setIntegrityChecker(integrityChecker);
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.setIntegrityChecker(integrityChecker);
}
}
/**
* PUBLIC:
* Set the session log.
*
* @see #logMessage
*/
@Override
public void setSessionLog(SessionLog log) {
super.setSessionLog(log);
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.setSessionLog(log);
}
}
/**
* PUBLIC:
* Set the message log.
*
* @see #logMessage
*/
@Override
public void setLog(Writer log) {
super.setLog(log);
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.setLog(log);
}
}
/**
* PUBLIC:
* Set the profiler for the session.
* This allows for performance operations to be profiled.
*/
@Override
public void setProfiler(SessionProfiler profiler) {
super.setProfiler(profiler);
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.setProfiler(profiler);
}
}
/**
* INTERNAL:
* Set sessions indexed by class, each class can only have one default session.
*/
protected void setSessionNameByClass(HashMap sessionNameByClass) {
this.sessionNamesByClass = sessionNameByClass;
}
/**
* INTERNAL:
* Set sessions indexed by name.
*/
public void setSessionsByName(Map sessionsByName) {
this.sessionsByName = sessionsByName;
}
/**
* INTERNAL:
* Set isSynchronized flag to indicate that members of session broker are synchronized.
* This method should only be called by setSynchronized method of UnitOfWork
* obtained from either DatabaseSession Broker or ClientSession Broker.
*/
@Override
public void setSynchronized(boolean synched) {
if(!isServerSessionBroker()) {
super.setSynchronized(synched);
Iterator itSessions = getSessionsByName().values().iterator();
while(itSessions.hasNext()) {
itSessions.next().setSynchronized(synched);
}
}
}
/**
* INTERNAL:
* This method notifies the accessor that a particular sets of writes has
* completed. This notification can be used for such thing as flushing the
* batch mechanism
*/
@Override
public void writesCompleted() {
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
if (!session.isConnected()) {
throw DatabaseException.databaseAccessorNotConnected();
}
}
for (Iterator sessionEnum = getSessionsByName().values().iterator();
sessionEnum.hasNext();) {
AbstractSession session = sessionEnum.next();
session.writesCompleted();
}
}
/**
* ADVANCED:
* Creates sequencing object for the session broker.
* Typically there is no need for the user to call this method -
* it is called by login() and acquireClientSessionBroker.
*/
@Override
public void initializeSequencing() {
sequencing = SequencingFactory.createSequencing(this);
}
/**
* PROTECTED:
* Session broker doesn't have SequencingHome.
*/
@Override
protected SequencingHome getSequencingHome() {
return null;
}
/**
* PUBLIC:
* Return the Sequencing object used by the session.
*/
@Override
public Sequencing getSequencing() {
return sequencing;
}
/**
* INTERNAL:
* Returns a number of member sessions that require sequencing callback.
* Always returns 0 if sequencing is not connected.
*/
public int howManySequencingCallbacks() {
if(this.isClientSessionBroker()) {
return getParent().howManySequencingCallbacks();
} else {
int nCallbacks = 0;
Iterator itSessions = getSessionsByName().values().iterator();
while(itSessions.hasNext()) {
if(((DatabaseSessionImpl)itSessions.next()).isSequencingCallbackRequired()) {
nCallbacks++;
}
}
return nCallbacks;
}
}
/**
* INTERNAL:
* Indicates whether SequencingCallback is required.
* Always returns false if sequencing is not connected.
*/
@Override
public boolean isSequencingCallbackRequired() {
return howManySequencingCallbacks() > 0;
}
/**
* PUBLIC:
* Indicates whether descriptors should use aliasDescriptors map.
* If aliasDescriptors is used then descriptors' aliases should be unique.
*/
public boolean shouldUseDescriptorAliases() {
return this.shouldUseDescriptorAliases;
}
/**
* PUBLIC:
* Indicates whether descriptors should use aliasDescriptors map.
* If aliasDescriptors is used then descriptors' aliases should be unique.
*/
public void setShouldUseDescriptorAliases(boolean shouldUseDescriptorAliases) {
this.shouldUseDescriptorAliases = shouldUseDescriptorAliases;
}
}