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From "Gal Nitzan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-24) make Configuration an interface
Date Wed, 10 May 2006 21:46:05 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-24?page=comments#action_12378979 ] 

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

Since this is my first interaction with Hadoop code "on a first name basis" :) I didn't want
to rock the boat too much.

My first goal was to implement the interfaces and the implementation with as little as possible
major changes all arround the code. As it is now all test are still working and nothing broken.

So if the patch would "pass" the reviews it would be easier to make additions when all blocks
are in place.

getPropertyNames is good idea to add as an interface to configuration.

Thanks.

> 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.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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