Github user chtyim commented on a diff in the pull request:

    https://github.com/apache/twill/pull/10#discussion_r78250557
  
    --- Diff: 
twill-discovery-api/src/main/java/org/apache/twill/discovery/Discoverable.java 
---
    @@ -19,19 +19,67 @@
     package org.apache.twill.discovery;
     
     import java.net.InetSocketAddress;
    +import java.util.Arrays;
     
     /**
      * Discoverable defines the attributes of service to be discovered.
      */
    -public interface Discoverable {
    +public class Discoverable {
    +  private final String name;
    +  private final InetSocketAddress address;
    +  private final byte[] payload;
     
    +  public Discoverable(String name, InetSocketAddress address, byte[] 
payload) {
    +    this.name = name;
    +    this.address = address;
    +    this.payload = payload;
    +  }
       /**
        * @return Name of the service
        */
    -  String getName();
    +  public String getName() {
    +    return name;
    +  }
     
       /**
        * @return An {@link InetSocketAddress} representing the host+port of 
the service.
        */
    -  InetSocketAddress getSocketAddress();
    +  public InetSocketAddress getSocketAddress() {
    +    return address;
    +  }
    +
    +  /**
    +   * @return A payload represented as a byte array
    +   */
    +  byte[] getPayload() {
    --- End diff --
    
    Should this be a `public` method?


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