[slf4j-dev] Consolidating the LoggerFactory / A better plugin mechanism

[Eric Crahen]

The Service API is in all sun JVMs since 1.3 under sun.misc.Service.
The docs can be found under the previous links I've sent.

On 2/15/07, Boris Unckel <boris.unckel.mlg at gmx.net> wrote:
>
> Hi,
>
> Eric Crahen wrote:
> > ....
> > I think that we can resolve the undesirable issues while still
> > retaining the behavior we have today. Here is my proposal:
> >
> > Create a single LoggerFactory and placed it into slf4j-api, and
> > deleted the LoggerFactory classes everywhere else they exist
> > (slf4j-simple, logback, etc). This new LoggerFactory leverages Sun's
> > ServiceProvider API which exists in all JDK's since 1.4 (maybe 1.3).
> > It looks like this:
>
> do you have a link to the service provider API? I searched the SUN site
> but did not find anything but the usage of the Service Provider but
> http://java.sun.com/j2se/1.4.2/docs/guide/jar/jar.html#Service%20Provider
>
> I am wondering this nice feature is just accesible through sun. packages.
>
> Regards
> Boris
>
>
> public class SampleServiceLoader {
>
>     public static final String SERVICE_ID =
>         "META-INF/services/org.slf4j.ILoggerFactory";
>
>     /**
>      *
>      */
>     public SampleServiceLoader() {
>         super();
>     }
>
>     public Object obtainFactory() {
>         ILoggerFactory ret = null;
>         ClassLoader cl = Thread.currentThread().getContextClassLoader();
>         InputStream is = cl.getResourceAsStream(SERVICE_ID);
>         String factoryname = null;
>         if(is != null) {
>             BufferedReader bufferedReader = null;
>             String errmsg = "Error obtaining service provider with
> id["+SERVICE_ID+"]";
>             try {
>                 bufferedReader = new BufferedReader(new
> InputStreamReader(is));
>                 factoryname = bufferedReader.readLine();
>                 Class factoryClass = cl.loadClass(factoryname);
>                 ret = factoryClass.newInstance();
>             } catch (IOException e) {
>                 throw new RuntimeException(errmsg,e);
>             } catch (ClassNotFoundException e) {
>                 throw new RuntimeException(errmsg,e);
>             } catch (InstantiationException e) {
>                 throw new RuntimeException(errmsg,e);
>             } catch (IllegalAccessException e) {
>                 throw new RuntimeException(errmsg,e);
>             } finally {
>                 try {
>                     bufferedReader.close();
>                 } catch (IOException e) {
>                     // NOP
>                 }
>             }
>         } else {
>             throw new RuntimeException("Service Provider["+SERVICE_ID+"]
> not found.");
>         }
>         return ret;
>     }
>
> }
>
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>



-- 

- Eric
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