datamanager.java

intra_mart是日本NDD公司开发的著名企业应用解决方案中间件。集成了J2ee服务器

/*
 * DataManager.java
 *
 * Created on 2001/10/29, 16:15
 */

package jp.co.intra_mart.framework.base.data;

import java.util.ResourceBundle;

import jp.co.intra_mart.framework.system.property.PropertyHandlerException;
import jp.co.intra_mart.framework.system.property.PropertyManager;
import jp.co.intra_mart.framework.system.log.LogConstant;
import jp.co.intra_mart.framework.system.log.LogManager;

import java.util.MissingResourceException;

import jp.co.intra_mart.framework.system.property.PropertyManagerException;

/**
 * 僨乕僞僗僩傾偲偺愙懕傪娗棟偟傑偡丅
 *
 * @author INTRAMART
 * @version 1.0
 */
public class DataManager {

    /**
     * 僨乕僞僼儗乕儉儚乕僋偺儘僌偺僾儗僼傿僢僋僗
     */
    static String LOG_HEAD = "[J2EE][Data]";

    /**
     * 僨乕僞僾儘僷僥傿僴儞僪儔偺僉乕
     */
    public static final String DATA_PROPERTY_HANDLER_KEY = "data";

    /**
     * 僨乕僞儅僱乕僕儍庢摼僼儔僌
     */
    private static Boolean managerFlag = new Boolean(false);

    /**
     * 僨乕僞儅僱乕僕儍
     */
    private static DataManager manager;

    /**
     * 僨乕僞僾儘僷僥傿僴儞僪儔
     */
    private DataPropertyHandler dataPropertyHandler;

    /**
     * 僨乕僞儅僱乕僕儍傪惗惉偡傞僐儞僗僩儔僋僞偱偡丅
     * 偙偺僐儞僗僩儔僋僞偼柧帵揑偵屇傃弌偡偙偲偼偱偒傑偣傫丅
     *
     * @throws DataManagerException 僨乕僞儅僱乕僕儍偺惗惉偵幐攕偟偨
     */
    protected DataManager() throws DataManagerException {
        PropertyManager propertyManager;

        // 僾儘僷僥傿儅僱乕僕儍偺庢摼
        try {
            propertyManager = PropertyManager.getPropertyManager();
        } catch (PropertyManagerException e) {
            String message = null;
            try {
                message =
                    ResourceBundle.getBundle(
                        "jp.co.intra_mart.framework.base.data.i18n").getString(
                        "DataManager.FailedToGetPropertyManager");
            } catch (MissingResourceException ex) {
            }
            throw new DataManagerException(message, e);
        }

        // 僨乕僞僾儘僷僥傿僴儞僪儔偺庢摼
        try {
            this.dataPropertyHandler =
                (DataPropertyHandler)propertyManager.getPropertyHandler(
                    DATA_PROPERTY_HANDLER_KEY);
        } catch (PropertyHandlerException e) {
            String message = null;
            try {
                message =
                    ResourceBundle.getBundle(
                        "jp.co.intra_mart.framework.base.data.i18n").getString(
                        "DataManager.FailedToGetDataPropertyHandler");
            } catch (MissingResourceException ex) {
            }
            throw new DataManagerException(
                message + " : key = " + DATA_PROPERTY_HANDLER_KEY,
                e);
        }
    }

    /**
     * 僨乕僞儅僱乕僕儍傪庢摼偟傑偡丅
     *
     * @return 僨乕僞儅僱乕僕儍
     * @throws DataManagerException 僨乕僞儅僱乕僕儍偺愝掕偵幐攕偟偨
     */
    public static DataManager getDataManager() throws DataManagerException {
        if (!managerFlag.booleanValue()) {
            synchronized (managerFlag) {
                if (!managerFlag.booleanValue()) {
                    try {
                        manager = new DataManager();
                    } catch (DataManagerException e) {
                        String message = null;
                        try {
                            message =
                                ResourceBundle.getBundle(
                                    "jp.co.intra_mart.framework.base.data.i18n")
                                        .getString(
                                    "DataManager.FailedToCreateDataManager");
                        } catch (MissingResourceException ex) {
                        }
                        LogManager.getLogManager().getLogAgent().sendMessage(
                            DataManager.class.getName(),
                            LogConstant.LEVEL_ERROR,
                            LOG_HEAD + message,
                            e);
                        //                        Report.error.write(LOG_HEAD + message, e);
                        throw e;
                    }
                    String message = null;
                    try {
                        message =
                            ResourceBundle.getBundle(
                                "jp.co.intra_mart.framework.base.data.i18n")
                                    .getString(
                                "DataManager.SuccessToCreateDataManager");
                    } catch (MissingResourceException e) {
                    }
                    managerFlag = new Boolean(true);
                    LogManager.getLogManager().getLogAgent().sendMessage(
                        DataManager.class.getName(),
                        LogConstant.LEVEL_INFO,
                        LOG_HEAD + message);
                    //                    Report.system.write(LOG_HEAD + message);
                }
            }
        }

        return manager;
    }

    /**
     * 僨乕僞傾僋僙僗僐儞僩儘乕儔傪庢摼偟傑偡丅
     *
     * @return 僨乕僞傾僋僙僗僐儞僩儘乕儔
     */
    public DataAccessController getDataAccessController() {
        return new DataAccessController(this.dataPropertyHandler);
    }

    /**
     * 僨乕僞僾儘僷僥傿僴儞僪儔傪庢摼偟傑偡丅
     *
     * @return 僨乕僞僾儘僷僥傿僴儞僪儔
     */
    public DataPropertyHandler getDataPropertyHandler() {
        return this.dataPropertyHandler;
    }
}