jobstoretx.java

定时器开源项目, 相对于 jcrontab, Quartz 算是更完整的一个项目, 随著开发的版本上来, 他已经脱离只是写在程序里面的计时器, 在指定的时间或区间, 处理所指定的事件. 也加入了 se

     * 
     * <p>
     * If removal of the <code>Trigger</code> results in an 'orphaned' <code>Job</code>
     * that is not 'durable', then the <code>Job</code> should be deleted
     * also.
     * </p>
     * 
     * @param triggerName
     *          The name of the <code>Trigger</code> to be removed.
     * @param groupName
     *          The group name of the <code>Trigger</code> to be removed.
     * @return <code>true</code> if a <code>Trigger</code> with the given
     *         name & group was found and removed from the store.
     */
    public boolean removeTrigger(SchedulingContext ctxt, String triggerName,
            String groupName) throws JobPersistenceException {
        Connection conn = getConnection();
        boolean transOwner = false;
        try {
            getLockHandler().obtainLock(conn, LOCK_TRIGGER_ACCESS);
            transOwner = true;
            //getLockHandler().obtainLock(conn, LOCK_JOB_ACCESS);

            boolean removed = removeTrigger(conn, ctxt, triggerName, groupName);
            commitConnection(conn);
            return removed;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            releaseLock(conn, LOCK_TRIGGER_ACCESS, transOwner);
          
            closeConnection(conn);
        }
    }

    /** 
     * @see org.quartz.spi.JobStore#replaceTrigger(org.quartz.core.SchedulingContext, java.lang.String, java.lang.String, org.quartz.Trigger)
     */
    public boolean replaceTrigger(SchedulingContext ctxt, String triggerName, String groupName, Trigger newTrigger) throws JobPersistenceException {
        Connection conn = getConnection();
        boolean transOwner = false;
        try {
            getLockHandler().obtainLock(conn, LOCK_TRIGGER_ACCESS);
            transOwner = true;
            //getLockHandler().obtainLock(conn, LOCK_JOB_ACCESS);

            boolean removed = replaceTrigger(conn, ctxt, triggerName, groupName, newTrigger);
            commitConnection(conn);
            return removed;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            releaseLock(conn, LOCK_TRIGGER_ACCESS, transOwner);
          
            closeConnection(conn);
        }
    }

    
    
    /**
     * <p>
     * Retrieve the given <code>{@link org.quartz.Trigger}</code>.
     * </p>
     * 
     * @param triggerName
     *          The name of the <code>Trigger</code> to be retrieved.
     * @param groupName
     *          The group name of the <code>Trigger</code> to be retrieved.
     * @return The desired <code>Trigger</code>, or null if there is no
     *         match.
     */
    public Trigger retrieveTrigger(SchedulingContext ctxt, String triggerName,
            String groupName) throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            Trigger trigger = retrieveTrigger(conn, ctxt, triggerName,
                    groupName);
            commitConnection(conn);
            return trigger;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Store the given <code>{@link org.quartz.Calendar}</code>.
     * </p>
     * 
     * @param calName
     *          The name of the calendar.
     * @param calendar
     *          The <code>Calendar</code> to be stored.
     * @param replaceExisting
     *          If <code>true</code>, any <code>Calendar</code> existing
     *          in the <code>JobStore</code> with the same name & group
     *          should be over-written.
     * @throws ObjectAlreadyExistsException
     *           if a <code>Calendar</code> with the same name already
     *           exists, and replaceExisting is set to false.
     */
    public void storeCalendar(SchedulingContext ctxt, String calName,
            Calendar calendar, boolean replaceExisting, boolean updateTriggers)
            throws ObjectAlreadyExistsException, JobPersistenceException {
        Connection conn = getConnection();
        boolean lockOwner = false;
        try {
            if(isLockOnInsert() || updateTriggers) {
                getLockHandler().obtainLock(conn, LOCK_TRIGGER_ACCESS);
                lockOwner = true;
            }
            
            storeCalendar(conn, ctxt, calName, calendar, replaceExisting, updateTriggers);
            commitConnection(conn);
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            releaseLock(conn, LOCK_TRIGGER_ACCESS, lockOwner);
          
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Remove (delete) the <code>{@link org.quartz.Calendar}</code> with the
     * given name.
     * </p>
     * 
     * <p>
     * If removal of the <code>Calendar</code> would result in
     * <code.Trigger</code>s pointing to non-existent calendars, then a
     * <code>JobPersistenceException</code> will be thrown.</p>
     *       *
     * @param calName The name of the <code>Calendar</code> to be removed.
     * @return <code>true</code> if a <code>Calendar</code> with the given name
     * was found and removed from the store.
     */
    public boolean removeCalendar(SchedulingContext ctxt, String calName)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            getLockHandler().obtainLock(conn, LOCK_CALENDAR_ACCESS);

            boolean removed = removeCalendar(conn, ctxt, calName);
            commitConnection(conn);
            return removed;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            releaseLock(conn, LOCK_CALENDAR_ACCESS, true);
          
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Retrieve the given <code>{@link org.quartz.Trigger}</code>.
     * </p>
     * 
     * @param calName
     *          The name of the <code>Calendar</code> to be retrieved.
     * @return The desired <code>Calendar</code>, or null if there is no
     *         match.
     */
    public Calendar retrieveCalendar(SchedulingContext ctxt, String calName)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            Calendar cal = retrieveCalendar(conn, ctxt, calName);
            commitConnection(conn);
            return cal;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    //---------------------------------------------------------------------------
    // informational methods
    //---------------------------------------------------------------------------

    /**
     * <p>
     * Get the number of <code>{@link org.quartz.Job}</code> s that are
     * stored in the <code>JobStore</code>.
     * </p>
     */
    public int getNumberOfJobs(SchedulingContext ctxt)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            int numJobs = getNumberOfJobs(conn, ctxt);
            commitConnection(conn);
            return numJobs;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Get the number of <code>{@link org.quartz.Trigger}</code> s that are
     * stored in the <code>JobsStore</code>.
     * </p>
     */
    public int getNumberOfTriggers(SchedulingContext ctxt)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            int numTriggers = getNumberOfTriggers(conn, ctxt);
            commitConnection(conn);
            return numTriggers;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Get the number of <code>{@link org.quartz.Calendar}</code> s that are
     * stored in the <code>JobsStore</code>.
     * </p>
     */
    public int getNumberOfCalendars(SchedulingContext ctxt)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            int numCals = getNumberOfCalendars(conn, ctxt);
            commitConnection(conn);
            return numCals;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    
    public Set getPausedTriggerGroups(SchedulingContext ctxt) 
        throws JobPersistenceException {

        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            Set groups = getPausedTriggerGroups(conn, ctxt);
            commitConnection(conn);
            return groups;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }
    
    /**
     * <p>
     * Get the names of all of the <code>{@link org.quartz.Job}</code> s that
     * have the given group name.
     * </p>
     * 
     * <p>
     * If there are no jobs in the given group name, the result should be a
     * zero-length array (not <code>null</code>).
     * </p>
     */
    public String[] getJobNames(SchedulingContext ctxt, String groupName)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            String[] jobNames = getJobNames(conn, ctxt, groupName);
            commitConnection(conn);
            return jobNames;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Get the names of all of the <code>{@link org.quartz.Trigger}</code> s
     * that have the given group name.
     * </p>
     * 
     * <p>
     * If there are no triggers in the given group name, the result should be a
     * zero-length array (not <code>null</code>).
     * </p>
     */
    public String[] getTriggerNames(SchedulingContext ctxt, String groupName)
            throws JobPersistenceException {
        Connection conn = getConnection();
        try {
            // no locks necessary for read...
            String[] triggerNames = getTriggerNames(conn, ctxt, groupName);
            commitConnection(conn);
            return triggerNames;
        } catch (JobPersistenceException e) {
            rollbackConnection(conn);
            throw e;
        } finally {
            closeConnection(conn);
        }
    }

    /**
     * <p>
     * Get the names of all of the <code>{@link org.quartz.Job}</code>
     * groups.
     * </p>
     * 
     * <p>
     * If there are no known group names, the result should be a zero-length
     * array (not <code>null</code>).