ofbiz實體引擎(六) GenericHelper的初始化創建

 /**
     * @author 鄭小康
     *
     * 1.根據groupName獲取GenericHelperInfo
     *
     * 2.獲取GenericHelperInfo的helperBaseName
     *
     * 3.如果HelperFullName不爲空,則進行下面的操作 HelperFullName可能是default,也可能是default#tenantId
     *
     * 4.根據helperBaseName(localmysql),獲取對應的ModelFieldTypeReader 字段類型閱讀器,這個是爲了在建表的時候的創建對應字段類型
     *
     * 5.根據helperInfo通過GenericHelperFactory工廠獲取GenericHelper,實際是GenericHelperDAO
     *
     * 6.根據helperBaseName獲取對應的Datasource標籤實例
     *
     * 7.根據GenericHelper所構建的實例,調用其checkDataSource檢查數據源,向其中添加未添加的表和字段
     *
     * */
    private void initializeOneGenericHelper(String groupName) {
        //根據groupName獲取GenericHelperInfo
        GenericHelperInfo helperInfo = this.getGroupHelperInfo(groupName);
        if (helperInfo == null) {
            if (Debug.infoOn()) {
                Debug.logInfo("Delegator \"" + delegatorFullName + "\" NOT initializing helper for entity group \"" + groupName + "\" because the group is not associated to this delegator.", module);
            }
            return;
        }
        String helperBaseName = helperInfo.getHelperBaseName();

        if (Debug.infoOn()) {
            Debug.logInfo("Delegator \"" + delegatorFullName + "\" initializing helper \"" + helperBaseName + "\" for entity group \"" + groupName + "\".", module);
        }
        if (UtilValidate.isNotEmpty(helperInfo.getHelperFullName())) {
            // pre-load field type defs, the return value is ignored
            ModelFieldTypeReader.getModelFieldTypeReader(helperBaseName);
            // get the helper and if configured, do the datasource check
            GenericHelper helper = GenericHelperFactory.getHelper(helperInfo);

            try {
                Datasource datasource = EntityConfig.getDatasource(helperBaseName);
                if (datasource.getCheckOnStart()) {
                    if (Debug.infoOn()) {
                        Debug.logInfo("Doing database check as requested in entityengine.xml with addMissing=" + datasource.getAddMissingOnStart(), module);
                    }
                    helper.checkDataSource(this.getModelEntityMapByGroup(groupName), null, datasource.getAddMissingOnStart());
                }
            } catch (GenericEntityException e) {
                Debug.logWarning(e, e.getMessage(), module);
            }
        }
    }

    protected Callable<Void> createHelperCallable(final String groupName) {
        return new Callable<Void>() {
            @Override
            public Void call() {
                initializeOneGenericHelper(groupName);
                return null;
            }
        };
    }