FederatedLookupTable (Apache SystemDS 3.0.0 API)

java.lang.Object
- org.apache.sysds.runtime.controlprogram.federated.FederatedLookupTable

```
public class FederatedLookupTable
extends Object
```
Lookup table mapping from a FedUniqueCoordID (funCID) to an ExecutionContextMap (ECM) so that every coordinator can address federated variables with its own local sequential variable IDs. Therefore, the IDs among different coordinators do not have to be distinct, as every coordinator works with a separate ECM at the FederatedWorker.

Field Summary

Fields
Modifier and Type Field Description

static String NOHOST

Constructor Summary

Constructors
Constructor Description

FederatedLookupTable()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`clear()`
`boolean`	`containsFunCID(String host, long pid)`	Check if there is a mapped ExecutionContextMap for the coordinator with the given host and pid.
`ExecutionContextMap`	`getECM(String host, long pid)`	Get the ExecutionContextMap corresponding to the given host and pid of the requesting coordinator from the lookup table.
`String`	`toString()`

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

- Field Detail
  - NOHOST
```
public static final String NOHOST
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - FederatedLookupTable
```
public FederatedLookupTable()
```
- Method Detail
  - clear
```
public void clear()
```
  - getECM
```
public ExecutionContextMap getECM(String host,
                                  long pid)
```
    Get the ExecutionContextMap corresponding to the given host and pid of the requesting coordinator from the lookup table. Create a new ExecutionContextMap if there is no corresponding entry in the lookup table.
    
    Parameters:
    
    host - the host string of the requesting coordinator (usually IP address)
    
    pid - the process id of the requesting coordinator
    
    Returns:
    
    ExecutionContextMap the ECM corresponding to the requesting coordinator
  - containsFunCID
```
public boolean containsFunCID(String host,
                              long pid)
```
    Check if there is a mapped ExecutionContextMap for the coordinator with the given host and pid.
    
    Parameters:
    
    host - the host string of the requesting coordinator (usually IP address)
    
    pid - the process id of the requesting coordinator
    
    Returns:
    
    boolean true if there is a lookup table entry, otherwise false
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object