[jira] [Created] (CURATOR-651) Why use Collection instead of List as return value

["lilu (Jira)" <ji...@apache.org>]

lilu created CURATOR-651:
----------------------------

             Summary: Why use Collection instead of List as return value
                 Key: CURATOR-651
                 URL: https://issues.apache.org/jira/browse/CURATOR-651
             Project: Apache Curator
          Issue Type: Bug
            Reporter: lilu
            Assignee: Jordan Zimmerman


org.apache.curator.x.discovery.ServiceDiscovery#queryForInstances

The implementation class internally calls org.apache.curator.x.discovery.details.ServiceDiscoveryImpl#queryForInstances(java.lang.String, org.apache.zookeeper.Watcher)

The specific code is：

 
{code:java}
@Override
public Collection<ServiceInstance<T>> queryForInstances(String name) throws Exception
{
    return queryForInstances(name, null);
}

List<ServiceInstance<T>> queryForInstances(String name, Watcher watcher) throws Exception
{
// ...
}{code}
Why is List implicitly converted to Collection?

This way I won't be able to use List.get(0) directly. but requires a conversion.

May I ask what is the reason for doing this?

 



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