activit5升到flowable后的全局设置的修改

用activiti做流程引擎时，我们需要定制一些全局配置，如主键的生成规则，全局事件等。
在activiti5中，是这样实现的

    @Bean(name = "processEngineConfiguration")
    public ProcessEngineConfigurationImpl processEngineConfiguration() {
        SpringProcessEngineConfiguration processEngineConfiguration = new SpringProcessEngineConfiguration();
        processEngineConfiguration.setDataSource(druidDataSource());
        processEngineConfiguration.setTransactionManager(annotationDrivenTransactionManager());
        //设置全局事件监听
        processEngineConfiguration.setTypedEventListeners(this.getGlobalActivitiEventListener());
        //重写节点行为
        processEngineConfiguration.setActivityBehaviorFactory(new ActivityBehaviorFactory());
        //设置主键生成
        processEngineConfiguration.setIdGenerator(new ActivitiIdGenerator());
        //设置函数
        processEngineConfiguration.setBeans(FunctionFactory.getFunctionBeans());
        return processEngineConfiguration;
    }

但是这样的代码，在flowable不起作用。经分析，调整代码如下：

@Bean
    public EngineConfigurationConfigurer<SpringProcessEngineConfiguration> customIdGeneratorConfigurer() {
        return engineConfiguration -> {engineConfiguration.setIdGenerator( customIdGenerator());
            engineConfiguration.setActivityBehaviorFactory(activityBehaviorFactory());
            engineConfiguration.setTransactionManager(transactionManager);
        };
    }

经测试，功能OK!
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