Quartz与Hibernate数据库连接的结合

2019-11-18 12:37:50

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   首先介绍一下我们的系统构架，采用webwork，sPRing，hibernate整合架构,现在引入Quartz框架,Quartz和 hibernate各自拥有的自己数据库配置和连接池的配置,现在的任务是把两者用同一套配置.
先谈谈Quartz,我用的版本是1.5.1,后面的版本我没去看了,没时间,接下来说的都以这个版本为准.Quartz虽然在提供一个 ConnectionProvider接口,提供给程序扩展,但是看它的StdSchedulerFactory实现类,要对它进行扩展还是一件比较麻烦一件事情,所以我就直接修改了StdSchedulerFactory类,以达到的我的需求.
接下来的问题是既然要结合,那么让Quartz来提供连接池配置呢还是有Hibernate提供.研究了两者的连接池方面的源代码,发现 Hibernate的连接池设计远远好于Quartz,Quartz目前只提供一个连接池提供类PoolingConnectionProvider,而且使用的连接池是dbcp,这个连接池听说问题多多,相反hibernate提供了更加灵活的配置,所以连接池由Hibernate提供.
    首先实现一个Quartz中ConnectionProvider子类HibernateConnectionProvider
public class HibernateConnectionProvider implements ConnectionProvider {
    private Connection con = null;
    protected static ThreadLocal hibernateHolder = new ThreadLocal();
    public Connection getConnection() throws SQLException {
        con = null;
        sessionFactoryImpl sessionFactory = null;
        sessionFactory = (SessionFactoryImpl) Global.getSessionFacotry();
        con = sessionFactory.getConnectionProvider().getConnection();
    return con;
}
public void shutdown() throws SQLException {
    // FIXME Auto-generated method stub
}
}
,然后修改StdSchedulerFactory,在不破坏其本来的逻辑和可配置性下进行了相应的修改.修改的是private Scheduler instantiate() throws SchedulerException方法,找到//Set up any DataSources段进行修改,代码如下:
String[] dsNames = cfg.getPropertyGroups(PROP_DATASOURCE_PREFIX);
        for (int i = 0; i < dsNames.length; i++) {
            PropertiesParser pp = new PropertiesParser(cfg.getPropertyGroup(
                    PROP_DATASOURCE_PREFIX + "." + dsNames[i], true));

            String dsDriver = pp
                    .getStringProperty(PROP_DATASOURCE_DRIVER, null);
            String dsURL = pp.getStringProperty(PROP_DATASOURCE_URL, null);
            boolean dsAlwaysLookup = pp.getBooleanProperty(
                    PROP_DATASOURCE_JNDI_ALWAYS_LOOKUP, false);
            String dsUser = pp.getStringProperty(PROP_DATASOURCE_USER, "");
            String dsPass = pp.getStringProperty(PROP_DATASOURCE_PASSWord, "");
            int dsCnt = pp.getIntProperty(PROP_DATASOURCE_MAX_CONNECTIONS, 3);
            String providerClass = pp.getStringProperty(
                    PROP_DATASOURCE_PROVIDER_CLASS, null);
            String dsJndi = pp
                    .getStringProperty(PROP_DATASOURCE_JNDI_URL, null);
            String dsJndiInitial = pp.getStringProperty(
                    PROP_DATASOURCE_JNDI_INITIAL, null);
            String dsJndiprovider = pp.getStringProperty(
                    PROP_DATASOURCE_JNDI_PROVDER, null);
            String dsJndiPrincipal = pp.getStringProperty(
                    PROP_DATASOURCE_JNDI_PRINCIPAL, null);
            String dsJndiCredentials = pp.getStringProperty(
                    PROP_DATASOURCE_JNDI_CREDENTIALS, null);
            String dsValidation = pp.getStringProperty(
                    PROP_DATASOURCE_VALIDATION_QUERY, null);
            if (providerClass == null
                    providerClass.equals("")
                    providerClass
                            .equals("org.quartz.utils.PoolingConnectionProvider")) {
                if (dsDriver == null) {
                    initException = new SchedulerException(
                            "Driver not specified for DataSource: "
                                    + dsNames[i]);
                    throw initException;
                }
                if (dsURL == null) {
                    initException = new SchedulerException(
                            "DB URL not specified for DataSource: "
                                    + dsNames[i]);
                    throw initException;
                }
                try {
                    PoolingConnectionProvider cp = new PoolingConnectionProvider(
                            dsDriver, dsURL, dsUser, dsPass, dsCnt,
                            dsValidation);
                    dbMgr = DBConnectionManager.getInstance();
                    dbMgr.addConnectionProvider(dsNames[i], cp);
                } catch (SQLException sqle) {
                    initException = new SchedulerException(
                            "Could not initialize DataSource: " + dsNames[i],
                            sqle);
                    throw initException;
                }
            } else if (providerClass
                    .equals("org.quartz.utils.JNDIConnectionProvider")) {
                Properties props = null;
                if (null != dsJndiInitial null != dsJndiProvider
                        null != dsJndiPrincipal null != dsJndiCredentials) {
                    props = new Properties();
                    if (dsJndiInitial != null)
                        props.put(PROP_DATASOURCE_JNDI_INITIAL, dsJndiInitial);
                    if (dsJndiProvider != null)
                        props.put(PROP_DATASOURCE_JNDI_PROVDER, dsJndiProvider);
                    if (dsJndiPrincipal != null)
                        props.put(PROP_DATASOURCE_JNDI_PRINCIPAL,
                                dsJndiPrincipal);
                    if (dsJndiCredentials != null)
                        props.put(PROP_DATASOURCE_JNDI_CREDENTIALS,
                                dsJndiCredentials);
                }
                JNDIConnectionProvider cp = new JNDIConnectionProvider(dsJndi,
                        props, dsAlwaysLookup);
                dbMgr = DBConnectionManager.getInstance();
                dbMgr.addConnectionProvider(dsNames[i], cp);
            } else if (providerClass
                    .equals("org.quartz.utils.HibernateConnectionProvider")) {
                HibernateConnectionProvider cp = new HibernateConnectionProvider();
                dbMgr = DBConnectionManager.getInstance();
                dbMgr.addConnectionProvider(dsNames[i], cp);
            } else {
                initException = new SchedulerException(
                        "Provider_Class not Supported: " + providerClass);
                throw initException;
            }

        }
    最后就是修改配置文件quartz.properties,加入
#org.quartz.dataSource.myDS.provider_class = org.quartz.utils.JNDIConnectionProvider
#org.quartz.dataSource.myDS.provider_class = org.quartz.utils.PoolingConnectionProvider
org.quartz.dataSource.myDS.provider_class = org.quartz.utils.HibernateConnectionProvider加#的供参考.

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