//by yan 20211228

Activiti里有幾個session工廠類

DbSqlSessionFactory

默認實現：DefaultSqlSessionFactory

EntityManagerSessionFactory 、SpringEntityManagerSessionFactory

默認實現：jpa的EntityManagerFactory

GenericManagerFactory

用于構造EntityCache

//ProcessEngineConfigurationImpl.java// session factories public void initSessionFactories() {if (sessionFactories == null) {sessionFactories = new HashMap<Class<?>, SessionFactory>();if (usingRelationalDatabase) {initDbSqlSessionFactory();}addSessionFactory(new GenericManagerFactory(EntityCache.class, EntityCacheImpl.class));}if (customSessionFactories != null) {for (SessionFactory sessionFactory : customSessionFactories) {addSessionFactory(sessionFactory);}}}public void initDbSqlSessionFactory() {if (dbSqlSessionFactory == null) {dbSqlSessionFactory = createDbSqlSessionFactory();}dbSqlSessionFactory.setDatabaseType(databaseType);dbSqlSessionFactory.setIdGenerator(idGenerator);dbSqlSessionFactory.setSqlSessionFactory(sqlSessionFactory);dbSqlSessionFactory.setDbHistoryUsed(isDbHistoryUsed);dbSqlSessionFactory.setDatabaseTablePrefix(databaseTablePrefix);dbSqlSessionFactory.setTablePrefixIsSchema(tablePrefixIsSchema);dbSqlSessionFactory.setDatabaseCatalog(databaseCatalog);dbSqlSessionFactory.setDatabaseSchema(databaseSchema);dbSqlSessionFactory.setBulkInsertEnabled(isBulkInsertEnabled, databaseType);dbSqlSessionFactory.setMaxNrOfStatementsInBulkInsert(maxNrOfStatementsInBulkInsert);addSessionFactory(dbSqlSessionFactory);}public DbSqlSessionFactory createDbSqlSessionFactory() {return new DbSqlSessionFactory();}public void addSessionFactory(SessionFactory sessionFactory) {sessionFactories.put(sessionFactory.getSessionType(), sessionFactory);} ...// JPA// //public void initJpa() {if (jpaPersistenceUnitName != null) {jpaEntityManagerFactory = JpaHelper.createEntityManagerFactory(jpaPersistenceUnitName);}if (jpaEntityManagerFactory != null) {sessionFactories.put(EntityManagerSession.class, new EntityManagerSessionFactory(jpaEntityManagerFactory, jpaHandleTransaction, jpaCloseEntityManager));VariableType jpaType = variableTypes.getVariableType(JPAEntityVariableType.TYPE_NAME);// Add JPA-typeif (jpaType == null) {// We try adding the variable right before SerializableType, if// availableint serializableIndex = variableTypes.getTypeIndex(SerializableType.TYPE_NAME);if (serializableIndex > -1) {variableTypes.addType(new JPAEntityVariableType(), serializableIndex);} else {variableTypes.addType(new JPAEntityVariableType());}}jpaType = variableTypes.getVariableType(JPAEntityListVariableType.TYPE_NAME);// Add JPA-list type after regular JPA type if not already presentif (jpaType == null) {variableTypes.addType(new JPAEntityListVariableType(), variableTypes.getTypeIndex(JPAEntityVariableType.TYPE_NAME));}}}

總結

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