英文:
Java Timer logic
问题
这是一些代码，我找到了其中需要为每个查询测量查询执行时间的部分。
为了测量，使用了 metricRegistry.timer，但是它是如何工作的？它测量哪个时间？因为我找不到任何定义停止时间的代码行，只有这一行。
有人能帮助我吗？在互联网上找不到任何信息。
try (PreparedStatement ps = connection.prepareStatement(QUERY.SQL())) {
try (
Timer.Context ignored = metricRegistry.timer(name("query", QUERY.NAME())).time();
ResultSet rs = ps.executeQuery()) {
if (rs.next()) {
successCounter.inc();
} else {
failedCounter.inc();
}
}
}
英文:
This is some code which i found where we need to measure the query execution time for each queries ?
For measuring that metricRegistry.timer is used but how it works which time it measures as i can't find any line of code which define stop time it just this line?
can anybody help me with that can't find anything on the internet ?
try (PreparedStatement ps = connection.prepareStatement(QUERY.SQL())) {
try (
Timer.Context ignored = metricRegistry.timer(name("query", QUERY.NAME())).time();
ResultSet rs = ps.executeQuery()) {
if (rs.next()) {
successCounter.inc();
} else {
failedCounter.inc();
}
}
}
答案1
得分: 0
A Timer.Context 是一个 Closeable，这意味着当你在像你这里一样的 try 块中使用它时，它的 close() 方法会在退出 try 块时被调用。此外，根据 Timer.Context 的 Javadocs（https://metrics.dropwizard.io/3.1.0/apidocs/com/codahale/metrics/Timer.Context.html），调用 close() 就相当于调用 stop()。因此，基本上在退出 try 块时会在计时器上调用 stop()。
英文:
A Timer.Context is a Closeable, which means that when you use it in a try block like you have here, its close() method is called when the try block is exited. Furthermore, per the Javadocs for Timer.Context (https://metrics.dropwizard.io/3.1.0/apidocs/com/codahale/metrics/Timer.Context.html), calling close() is like calling stop(). So basically, stop() is called on the timer when the try block is exited.
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