[ http://issues.apache.org/jira/browse/HADOOP-24?page=all ]
Doug Cutting updated HADOOP-24:
-------------------------------
Status: Open (was: Patch Available)
> make Configuration an interface
> -------------------------------
>
> Key: HADOOP-24
> URL: http://issues.apache.org/jira/browse/HADOOP-24
> Project: Hadoop
> Issue Type: Improvement
> Components: conf
> Affects Versions: 0.7.2
> Reporter: Doug Cutting
> Attachments: configuration.java, configuration.patch,
> 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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