Activiti的两个大神

看到Activiti的两个大神的介绍了！

Tom Baeyens - Activiti创立者

可惜Tom已经不在团队了，甚至连个联系方式都没有留下，小小的遗憾。

Joram Barrez -Activiti核心开发人员

Blog:  http://www.jorambarrez.be/blog/

Twitter:  http://twitter.com/jbarrez

LinkedIn:  http://be.linkedin.com/in/jorambarrez

瞧瞧人家写的代码，真是不服不行啊！

package org.activiti.engine.impl.cfg;

/**
 * @author Tom Baeyens
 * @author Joram Barrez
 */
public abstract class ProcessEngineConfigurationImpl extends ProcessEngineConfiguration {  

  private static Logger log = LoggerFactory.getLogger(ProcessEngineConfigurationImpl.class);
  
  public static final String DB_SCHEMA_UPDATE_CREATE = "create";
  public static final String DB_SCHEMA_UPDATE_DROP_CREATE = "drop-create";

  public static final String DEFAULT_WS_SYNC_FACTORY = "org.activiti.engine.impl.webservice.CxfWebServiceClientFactory";
  
  public static final String DEFAULT_MYBATIS_MAPPING_FILE = "org/activiti/db/mapping/mappings.xml";

  // SERVICES /

  protected RepositoryService repositoryService = new RepositoryServiceImpl();
  protected RuntimeService runtimeService = new RuntimeServiceImpl();
  protected HistoryService historyService = new HistoryServiceImpl(this);
  protected IdentityService identityService = new IdentityServiceImpl();
  protected TaskService taskService = new TaskServiceImpl(this);
  protected FormService formService = new FormServiceImpl();
  protected ManagementService managementService = new ManagementServiceImpl();
  
  // COMMAND EXECUTORS 
  
  protected CommandConfig defaultCommandConfig;
  protected CommandConfig schemaCommandConfig;
  
  protected CommandInterceptor commandInvoker;
  
  /** the configurable list which will be {@link #initInterceptorChain(java.util.List) processed} to build the {@link #commandExecutor} */
  protected List<CommandInterceptor> customPreCommandInterceptors;
  protected List<CommandInterceptor> customPostCommandInterceptors;
  
  protected List<CommandInterceptor> commandInterceptors;

  /** this will be initialized during the configurationComplete() */
  protected CommandExecutor commandExecutor;
  
  // SESSION FACTORIES 

  protected List<SessionFactory> customSessionFactories;
  protected DbSqlSessionFactory dbSqlSessionFactory;
  protected Map<Class<?>, SessionFactory> sessionFactories;
  
  // Configurators 
  
  protected boolean enableConfiguratorServiceLoader = true; // Enabled by default. In certain environments this should be set to false (eg osgi)
  protected List<ProcessEngineConfigurator> configurators; // The injected configurators
  protected List<ProcessEngineConfigurator> allConfigurators; // Including auto-discovered configurators
  
  // DEPLOYERS 

  protected BpmnDeployer bpmnDeployer;
  protected BpmnParser bpmnParser;
  protected List<Deployer> customPreDeployers;
  protected List<Deployer> customPostDeployers;
  protected List<Deployer> deployers;
  protected DeploymentManager deploymentManager;
  
  protected int processDefinitionCacheLimit = -1; // By default, no limit
  protected DeploymentCache<ProcessDefinitionEntity> processDefinitionCache;
  
  protected int knowledgeBaseCacheLimit = -1;
  protected DeploymentCache<Object> knowledgeBaseCache;

  // JOB EXECUTOR /
  
  protected List<JobHandler> customJobHandlers;
  protected Map<String, JobHandler> jobHandlers;

  // MYBATIS SQL SESSION FACTORY //
  
  protected SqlSessionFactory sqlSessionFactory;
  protected TransactionFactory transactionFactory;
  
  protected Set<Class<?>> customMybatisMappers;

  // ID GENERATOR /
  
  protected IdGenerator idGenerator;
  protected DataSource idGeneratorDataSource;
  protected String idGeneratorDataSourceJndiName;
  
  // BPMN PARSER //
  
  protected List<BpmnParseHandler> preBpmnParseHandlers;
  protected List<BpmnParseHandler> postBpmnParseHandlers;
  protected List<BpmnParseHandler> customDefaultBpmnParseHandlers;
  protected ActivityBehaviorFactory activityBehaviorFactory;
  protected ListenerFactory listenerFactory;
  protected BpmnParseFactory bpmnParseFactory;
  
  // PROCESS VALIDATION 
  
  protected ProcessValidator processValidator;

  // OTHER 
  
  protected List<FormEngine> customFormEngines;
  protected Map<String, FormEngine> formEngines;

  protected List<AbstractFormType> customFormTypes;
  protected FormTypes formTypes;

  protected List<VariableType> customPreVariableTypes;
  protected List<VariableType> customPostVariableTypes;
  protected VariableTypes variableTypes;
  
  protected ExpressionManager expressionManager;
  protected List<String> customScriptingEngineClasses;
  protected ScriptingEngines scriptingEngines;
  protected List<ResolverFactory> resolverFactories;
  
  protected BusinessCalendarManager businessCalendarManager;

  protected String wsSyncFactoryClassName = DEFAULT_WS_SYNC_FACTORY;

  protected CommandContextFactory commandContextFactory;
  protected TransactionContextFactory transactionContextFactory;
  
  protected Map<Object, Object> beans;
  
  protected DelegateInterceptor delegateInterceptor;

  protected RejectedJobsHandler customRejectedJobsHandler;
  
  protected Map<String, EventHandler> eventHandlers;
  protected List<EventHandler> customEventHandlers;

  protected FailedJobCommandFactory failedJobCommandFactory;
  
  /**
   * Set this to true if you want to have extra checks on the BPMN xml that is parsed.
   * See http://www.jorambarrez.be/blog/2013/02/19/uploading-a-funny-xml-can-bring-down-your-server/
   * 
   * Unfortunately, this feature is not available on some platforms (JDK 6, JBoss),
   * hence the reason why it is disabled by default. If your platform allows 
   * the use of StaxSource during XML parsing, do enable it.
   */
  protected boolean enableSafeBpmnXml = false;
  
  /**
   * The following settings will determine the amount of entities loaded at once when the engine 
   * needs to load multiple entities (eg. when suspending a process definition with all its process instances).
   * 
   * The default setting is quite low, as not to surprise anyone with sudden memory spikes.
   * Change it to something higher if the environment Activiti runs in allows it.
   */
  protected int batchSizeProcessInstances = 25;
  protected int batchSizeTasks = 25;
  
  /**
   * Experimental setting. Default is false.
   * 
   * If set to true, in the {@link DbSqlSession} during the handling of delete operations,
   * those operations of the same type are merged together. 
   * (eg if you have two 'DELETE from X where id=Y' and 'DELETE from X where id=W', it will be merged
   * into one delete statement 'DELETE from X where id=Y or id=W'.
   */
  protected boolean isOptimizeDeleteOperationsEnabled;
  
  protected boolean enableEventDispatcher = true;
  protected ActivitiEventDispatcher eventDispatcher;
  protected List<ActivitiEventListener> eventListeners;
  protected Map<String, List<ActivitiEventListener>> typedEventListeners;
  
  // Event logging to database
  protected boolean enableDatabaseEventLogging = false;
  
  
  // buildProcessEngine ///
  
  public ProcessEngine buildProcessEngine() {
    init();
    return new ProcessEngineImpl(this);
  }
  
  // init /
  
  protected void init() {
  	initConfigurators();
  	configuratorsBeforeInit();
    initProcessDiagramGenerator();
    initHistoryLevel();
    initExpressionManager();
    initVariableTypes();
    initBeans();
    initFormEngines();
    initFormTypes();
    initScriptingEngines();
    initClock();
    initBusinessCalendarManager();
    initCommandContextFactory();
    initTransactionContextFactory();
    initCommandExecutors();
    initServices();
    initIdGenerator();
    initDeployers();
    initJobExecutor();
    initDataSource();
    initTransactionFactory();
    initSqlSessionFactory();
    initSessionFactories();
    initJpa();
    initDelegateInterceptor();
    initEventHandlers();
    initFailedJobCommandFactory();
    initEventDispatcher();
    initProcessValidator();
    initDatabaseEventLogging();
    configuratorsAfterInit();
  }
  //......
}