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From "Gal Nitzan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-24) make Configuration an interface
Date Fri, 19 May 2006 23:28:31 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-24?page=comments#action_12412610 ] 

Gal Nitzan commented on HADOOP-24:
----------------------------------

Great, I shall rewrite and submit a new patch for review.

> make Configuration an interface
> -------------------------------
>
>          Key: HADOOP-24
>          URL: http://issues.apache.org/jira/browse/HADOOP-24
>      Project: Hadoop
>         Type: Improvement

>   Components: conf
>     Reporter: Doug Cutting
>  Attachments: HADOOP-24-2.patch, HADOOP-24-3.patch, HADOOP-24-4.patch, HADOOP-24.patch,
HADOOP-24.patch
>
> The Configuration class should become an interface, e.g.:
> public interface Configuration {
>   String get(String nam);
>   String set(String name, String value);
>   int getInt(String name);
>   void setInt(String name, int value);
>   float getFloat(String name);
>   void setFloat(String name, float value);
>   //... other utility methods based on get(String) and set(String,String) ...
> }
> An abstract class named ConfigurationBase should be implemented as follows:
> public abstract class ConfigurationBase implements Configuration {
>   abstract public String get(String nam);
>   abstract public String set(String name, String value);
>   public  int getInt(String name) { ... implementation in terms of get(String) ... }
>   public void setInt(String name, int value) {... implementation in terms of set(String,
String) ...}
>   public float getFloat(String name)  { ... implementation in terms of get(String) ...
}
>   public void setFloat(String name, float value)  {... implementation in terms of set(String,
String) ...}
>   //... other utility methods based on get(String) and set(String,String) ...
> }
> A concrete, default implementation will be provided as follows:
> public class ConfigurationImpl implements Writable extends ConfigurationBase {
>   private Properties properties;
>   // implement abstract methods from ConfigurationBase
>   public String get(String name) { ... implemented in terms of props ...}
>   public String set(String name, String value) { .. implemented in terms of props ...
}
>   // Writable methods
>   public write(DataOutputStream out);
>   public readFields(DataInputStream in);
>   // permit chaining of configurations
>   public Configuration getDefaults();
>   public void setDefaults(Configuration defaults);
> }
> Only code which creates configurations should need to be updated, so this shouldn't be
a huge change.

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