Package org.apache.hadoop.ipc

Class ClientCache

java.lang.Object

org.apache.hadoop.ipc.ClientCache

@LimitedPrivate({"HDFS","MapReduce"})
@Evolving
public class ClientCache
extends Object

Constructor Summary

Constructors

Constructor	Description
ClientCache()

Method Summary

Modifier and Type	Method	Description
void	clearCache()
Client	getClient(Configuration conf)	Construct & cache an IPC client with the default SocketFactory and default valueClass if no cached client exists.
Client	getClient(Configuration conf, SocketFactory factory)	Construct & cache an IPC client with the user-provided SocketFactory if no cached client exists.
Client	getClient(Configuration conf, SocketFactory factory, Class<? extends Writable> valueClass)	Construct & cache an IPC client with the user-provided SocketFactory if no cached client exists.
void	stopClient(Client client)	Stop a RPC client connection A RPC client is closed only when its reference count becomes zero.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ClientCache

public ClientCache()

Method Details

getClient

public Client getClient(Configuration conf,
 SocketFactory factory,
 Class<? extends Writable> valueClass)

Construct & cache an IPC client with the user-provided SocketFactory if no cached client exists.

Parameters:

conf - Configuration

factory - SocketFactory for client socket

valueClass - Class of the expected response

Returns:

an IPC client

getClient

public Client getClient(Configuration conf)

Construct & cache an IPC client with the default SocketFactory and default valueClass if no cached client exists.

Parameters:

conf - Configuration

Returns:

an IPC client

getClient

public Client getClient(Configuration conf,
 SocketFactory factory)

Construct & cache an IPC client with the user-provided SocketFactory if no cached client exists. Default response type is ObjectWritable.

Parameters:

conf - Configuration

factory - SocketFactory for client socket

Returns:

an IPC client

stopClient

public void stopClient(Client client)

Stop a RPC client connection A RPC client is closed only when its reference count becomes zero.

Parameters:

client - input client.

clearCache

@VisibleForTesting
public void clearCache()