Client (Flink : Queryable state : Client Java 2.1.0 API)

java.lang.Object
- org.apache.flink.queryablestate.network.Client<REQ,RESP>

Type Parameters:

REQ - the type of request the client will send.

RESP - the type of response the client expects to receive.
```
@Internal
public class Client<REQ extends MessageBody,RESP extends MessageBody>
extends Object
```
The base class for every client in the queryable state module. It is using pure netty to send and receive messages of type MessageBody.

Constructor Summary

Constructors
Constructor	Description
`Client(String clientName, int numEventLoopThreads, MessageSerializer<REQ,RESP> serializer, KvStateRequestStats stats)`	Creates a client with the specified number of event loop threads.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`getClientName()`
`boolean`	`isEventGroupShutdown()`
`CompletableFuture<RESP>`	`sendRequest(InetSocketAddress serverAddress, REQ request)`
`CompletableFuture<Void>`	`shutdown()`	Shuts down the client and closes all connections.

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

- Constructor Detail
  - Client
```
public Client(String clientName,
              int numEventLoopThreads,
              MessageSerializer<REQ,RESP> serializer,
              KvStateRequestStats stats)
```
    Creates a client with the specified number of event loop threads.
    
    Parameters:
    
    clientName - the name of the client.
    
    numEventLoopThreads - number of event loop threads (minimum 1).
    
    serializer - the serializer used to (de-)serialize messages.
    
    stats - the statistics collector.
- Method Detail
  - getClientName
```
public String getClientName()
```
  - sendRequest
```
public CompletableFuture<RESP> sendRequest(InetSocketAddress serverAddress,
                                           REQ request)
```
  - shutdown
```
public CompletableFuture<Void> shutdown()
```
    Shuts down the client and closes all connections.
    After a call to this method, all returned futures will be failed.
    
    Returns:
    
    A CompletableFuture that will be completed when the shutdown process is done.
  - isEventGroupShutdown
```
@VisibleForTesting
public boolean isEventGroupShutdown()
```