如何正确使用guava Closer(How to use guava Closer properly)

 我正在努力弄清楚如何使用番石榴库中的Closer实用程序。 请参阅下面的代码。 
 
 
 
 有一点是， IndexWriter在对象初始化和close()上都抛出IOException 。 因此，finally和rethrow块中的代码带有下划线。 
 
 
 另一个问题是，为什么我必须捕获Throwable而不是其他异常类型并且我必须重新抛出错误（我更愿意在现场记录那些） 
 
 
 ` 
 
int getDocumentsCount() {
    Closer closer = Closer.create();
    try {
        IndexWriter iwriter = closer.register(openIndexWriter());
        return iwriter.numDocs();
    } catch (Throwable e) {
        logger.error(e, e);
        return -1;
    } finally {
        closer.close();
    }
}


IndexWriter openIndexWriter() throws IOException {
    return new IndexWriter(directory, analyzer, false,
        IndexWriter.MaxFieldLength.UNLIMITED);
}
 
 ` 
 
 非常感谢 
 
 （坚持使用Java 6） 

i'm struggling to figure out how to use the Closer utility from the guava library. Please see the code below. 
 
 
 
One thing is, that the IndexWriter throws an IOException on both object initialization and close(). Therefore, the code in the finally and rethrow blocks is underlined. 
 
 
The other question is, why do i have to catch Throwable instead of other exception types and do i have to rethrow the errors (i would prefer to log those at the spot)
 
 
`
 
int getDocumentsCount() {
    Closer closer = Closer.create();
    try {
        IndexWriter iwriter = closer.register(openIndexWriter());
        return iwriter.numDocs();
    } catch (Throwable e) {
        logger.error(e, e);
        return -1;
    } finally {
        closer.close();
    }
}


IndexWriter openIndexWriter() throws IOException {
    return new IndexWriter(directory, analyzer, false,
        IndexWriter.MaxFieldLength.UNLIMITED);
}
 
`
 
Thanks a lot 
 
(stuck with Java 6)

原文：https://stackoverflow.com/questions/39658005