templates - Groovy/Grails SimpleTemplateEngine 冻结

Question

我正在使用 Grails 发送大量 HTML 电子邮件。我使用 SimpleTemplateEngine 以这种方式创建我的电子邮件正文：

def ccIdToEmailMap = [:]
def emailTemplateFile = Utilities.retrieveFile("email${File.separator}emailTemplate.gtpl")
def engine = new SimpleTemplateEngine()
def clientContacts = ClientContact.list()
for(ClientContact cc in clientContactList) {
   def binding = [clientContact : cc]

   //STOPS (FREEZES) EITHER HERE OR....
   def template = template = engine.createTemplate(emailTemplateFile).make(binding)

   //OR STOPS (FREEZES) HERE
   def body = template.toString()

   def email = [text: body, to: cc.emailAddress]
   ccIdToEmailMap.put(cc.id, email)
   println "added to map"
}
return ccIdToEmailMap

这是我尝试为每个电子邮件正文呈现的模板：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">


<html>
<head>
<title>Happy Holidays from google Partners</title>
</head>

<body>
    <table width="492" cellpadding="0" cellspacing="0" style="border:2px solid #acacac;margin:8px auto;" align="center">
        <tr>
            <td colspan="5" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/cardbg.gif" width="492" height="10" border="0"></td>
        </tr>

        <tr>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgl.gif" width="6" height="453" border="0"></td>
            <td style="background:#fff;border:1px solid #acacac;padding:2px;" width="228">
                <div style="width:208px;margin:4px 8px 0px 8px; color:#515151;">
                <font face="Times New Roman" size="2">
                <span style="font:14px 'Times New Roman',times,serif;">Static text that is the same for each email
                <br>&nbsp;<br>
                More text
                <br>&nbsp;<br>
                We wish you health and happiness during the holidays and a year of growth in 2009.
                </span>
                </font>
                </div>
            </td>
            <td style="background:#c9f4fe;border-top:1px solid #acacac;border-bottom:1px solid #acacac;" width="5"><img src="http://www.google.com/holiday2008/vertbg.gif" border="0" height="453" width="5"></td>
            <td width="247" style="background:#fff;border:1px solid #acacac;"><img src="http://www.google.com/holiday2008/snowing.gif" width="247" height="453" border="0"></td>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgr.gif" width="6" height="453" border="0"></td>
        </tr>
        <tr>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgr.gif" width="6" height="38" border="0"></td>
            <td colspan="3" style="border:1px solid #acacac;" align="center"><img src="http://www.google.com/holiday2008/happyholidays.gif" width="480" height="38" alt="Happy Holidays" border="0"></td>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgr.gif" width="6" height="38" border="0"></td>
        </tr>
        <tr>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgr.gif" width="6" height="120" border="0"></td>
            <td colspan="3" style="background-color#fff;border:1px solid #acacac;padding:2px;" valign="top">
                <img src="http://www.google.com/holiday2008/gogl_logo_card.gif" width="140" height="40" alt="google partners" border="0" align="right" hspace="4" vspace="4" />
                <font face="Times New Roman" size="2">
                <div style="padding:4px;font:12pt 'Times New Roman',serif;color:#515151;">
                <span style="font-size:10pt"><i>from:</i></span>

                    <div style="padding:2px 4px;">
                        <% clientContact.owners.eachWithIndex { it, i -> %>
                            <% if(i < (clientContact.owners.size() - 1)) { %>
                                ${it.toString()},
                            <% }else { %>
                                ${it.toString()}
                            <% } %>
                        <% } %>
                    </div>
                </div>
                </font>
            </td>
            <td width="6" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/sidebgr.gif" width="6" height="120" border="0"></td>
        </tr>
        <tr>
            <td colspan="5" bgcolor="#c1e0f3"><img src="http://www.google.com/holiday2008/cardbg.gif" width="492" height="10" border="0"></td>

        </tr>
    </table>
</body>
</html>

一旦此方法返回 ccIdToEmail 映射，我就会发送所有电子邮件。出于某种原因，准备这张 clientContactIds 和电子邮件正文的映射会导致我的应用程序在上面列出的两行中的任何一行冻结。我可以在冻结之前成功准备/发送约 140 封电子邮件。这种情况非常一致地发生。

有谁知道为什么这会起作用，但在从模板创建约 140 个电子邮件正文后停止工作？我无法在网上找到任何关于其他人遇到此问题的信息。

安德鲁

score 1 · Accepted Answer

听起来像一个同步问题。作为第一步，您应该在循环之外创建模板。因为不需要每次都重新创建模板。

    def ccIdToEmailMap = [:]
    def emailTemplateFile = Utilities.retrieveFile("email${File.separator}emailTemplate.gtpl")
    def engine = new SimpleTemplateEngine()
    def template = engine.createTemplate(emailTemplateFile)
    def clientContacts = ClientContact.list()
    for(ClientContact cc in clientContactList)
    {
            def binding = [clientContact : cc]
            def body = template.make(binding).toString()
            def email = [text: body, to: cc.emailAddress]
            ccIdToEmailMap.put(cc.id, email)
            println "added to map"
    }
    return ccIdToEmailMap

如果它没有帮助，如果您发布模板内容和/或 ClientContact 的来源可能会有所帮助。

hth，西吉

score 0 · Accepted Answer

在模板中延迟加载我的客户联系人所有者似乎存在问题。在 SimpleTemplateEngine 制作电子邮件正文时，我没有期望所有者被加载（效率低下），而是在绑定/制作正文之前急切地获取所有者。

我上面的代码现在看起来像这样：

    def emailTemplateFile = null
    def ccIdToEmailMap = [:]

    emailTemplateFile = Utilities.retrieveFile("email${File.separator}emailTemplate.gtpl")
    def engine = new SimpleTemplateEngine()
    def template = engine.createTemplate(emailTemplateFile)
    for(ClientContact cc in clientContactList)
    {
        //there was a locking problem when we tried to create the template for too many client contacts
        //i believe it was caused by lazy-fetching of the person/owners.  So, I fetch them before we bind
        //and make the email body.
        def criteria = ClientContact.createCriteria()
        cc = criteria.get {
            eq("id", cc.id)
            fetchMode('relationship', FM.EAGER)
            fetchMode('relationship.person', FM.EAGER)
        }
        def binding = [clientContact : cc]
        def body = template.make(binding).toString()
        def email = [text: body, to: cc.emailAddress]
        ccIdToEmailMap.put(cc.id, email)
    }

    return ccIdToEmailMap

为每个客户联系人进行如此多的查询仍然有点低效，但它可以工作。我无法解释为什么在模板制作期间延迟加载它们会导致 grails/groovy 冻结，但确实如此。如果有人能解释一下，我将不胜感激。

谢谢您的回答。齐格弗里德……你让我朝着正确的方向开始。

安德鲁

templates - Groovy/Grails SimpleTemplateEngine 冻结

2 回答 2

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