TaskManagerLocation.DefaultHostNameSupplier (Flink : Runtime 2.0.0 API)

java.lang.Object
- org.apache.flink.runtime.taskmanager.TaskManagerLocation.DefaultHostNameSupplier

All Implemented Interfaces:

Serializable, TaskManagerLocation.HostNameSupplier

Enclosing class:

TaskManagerLocation
```
@VisibleForTesting
public static class TaskManagerLocation.DefaultHostNameSupplier
extends Object
implements TaskManagerLocation.HostNameSupplier
```
This Supplier class could retrieve the FQDN host name of the given InetAddress on demand, extract the pure host name and cache the results for later use.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

DefaultHostNameSupplier(InetAddress inetAddress)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getFqdnHostName()`	Returns the fully-qualified domain name the TaskManager.
`String`	`getHostName()`	Gets the hostname of the TaskManager.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DefaultHostNameSupplier
```
public DefaultHostNameSupplier(InetAddress inetAddress)
```
- Method Detail
  - getHostName
```
public String getHostName()
```
    Gets the hostname of the TaskManager. The hostname derives from the fully qualified domain name (FQDN, see TaskManagerLocation.getFQDNHostname()):
    
    If the FQDN is the textual IP address, then the hostname is also the IP address
    If the FQDN has only one segment (such as "localhost", or "host17"), then this is used as the hostname.
    If the FQDN has multiple segments (such as "worker3.subgroup.company.net"), then the first segment (here "worker3") will be used as the hostname.
    Specified by:
    
    getHostName in interface TaskManagerLocation.HostNameSupplier
    
    Returns:
    
    The hostname of the TaskManager.
  - getFqdnHostName
```
public String getFqdnHostName()
```
    Returns the fully-qualified domain name the TaskManager. If the name could not be determined, the return value will be a textual representation of the TaskManager's IP address.
    
    Specified by:
    
    getFqdnHostName in interface TaskManagerLocation.HostNameSupplier
    
    Returns:
    
    The fully-qualified domain name of the TaskManager.