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https://issues.apache.org/jira/browse/HDFS-9117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009349#comment-15009349
]
Haohui Mai commented on HDFS-9117:
----------------------------------
Just an example:
{code:title=decl.h}
#include <string>
template <class T>
struct Optional {
T val;
};
class Configuration {
public:
template<class T> Optional<T> get(const std::string &key);
private:
const std::string &get_impl();
};
template<> Optional<int> Configuration::get<int>(const std::string &key);
{code}
{code:title=impl.cc}
template<>
Optional<int> Configuration::get<int>(const std::string &key) {
Optional<int> r;
r.val = 42;
return r;
}
{code}
{code:title=main.cc}
int main() {
Configuration conf;
return conf.get<int>("asdf").val;
}
{code}
> Config file reader / options classes for libhdfs++
> --------------------------------------------------
>
> Key: HDFS-9117
> URL: https://issues.apache.org/jira/browse/HDFS-9117
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Affects Versions: HDFS-8707
> Reporter: Bob Hansen
> Assignee: Bob Hansen
> Attachments: HDFS-9117.HDFS-8707.001.patch,
> HDFS-9117.HDFS-8707.002.patch, HDFS-9117.HDFS-8707.003.patch,
> HDFS-9117.HDFS-8707.004.patch, HDFS-9117.HDFS-8707.005.patch,
> HDFS-9117.HDFS-8707.006.patch, HDFS-9117.HDFS-8707.008.patch,
> HDFS-9117.HDFS-8707.009.patch, HDFS-9117.HDFS-8707.010.patch,
> HDFS-9117.HDFS-8707.011.patch, HDFS-9117.HDFS-8707.012.patch,
> HDFS-9117.HDFS-8707.013.patch, HDFS-9117.HDFS-8707.014.patch,
> HDFS-9117.HDFS-8707.015.patch, HDFS-9117.HDFS-9288.007.patch
>
>
> For environmental compatability with HDFS installations, libhdfs++ should be
> able to read the configurations from Hadoop XML files and behave in line with
> the Java implementation.
> Most notably, machine names and ports should be readable from Hadoop XML
> configuration files.
> Similarly, an internal Options architecture for libhdfs++ should be developed
> to efficiently transport the configuration information within the system.
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