Package org.apache.hadoop.hdfs.server.federation.router

Class ConnectionContext

java.lang.Object

org.apache.hadoop.hdfs.server.federation.router.ConnectionContext

public class ConnectionContext
extends java.lang.Object

Context to track a connection in a ConnectionPool. When a client uses a connection, it increments a counter to mark it as active. Once the client is done with the connection, it decreases the counter. It also takes care of closing the connection once is not active. The protocols currently used are:

• ClientProtocol
• NamenodeProtocol

Constructor Summary

Constructors

Constructor	Description
ConnectionContext(org.apache.hadoop.hdfs.NameNodeProxiesClient.ProxyAndInfo<?> connection, org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method	Description
void	close()
void	close(boolean force)	Close a connection.
org.apache.hadoop.hdfs.NameNodeProxiesClient.ProxyAndInfo<?>	getClient()	Get the connection client.
boolean	isActive()	Check if the connection is active.
boolean	isActiveRecently()	Check if the connection is/was active recently.
boolean	isClosed()	Check if the connection is closed.
boolean	isIdle()	Check if the connection is idle.
boolean	isUsable()	Check if the connection can be used.
void	release()	Release this connection.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ConnectionContext

public ConnectionContext(org.apache.hadoop.hdfs.NameNodeProxiesClient.ProxyAndInfo<?> connection,
                         org.apache.hadoop.conf.Configuration conf)

Method Detail

isActive

public boolean isActive()

Check if the connection is active.

Returns:

True if the connection is active.

isActiveRecently

public boolean isActiveRecently()

Check if the connection is/was active recently.

Returns:

True if the connection is active or was active in the past period of time.

isClosed

public boolean isClosed()

Check if the connection is closed.

Returns:

If the connection is closed.

isUsable

public boolean isUsable()

Check if the connection can be used. It checks if the connection is used by another thread or already closed.

Returns:

True if the connection can be used.

isIdle

public boolean isIdle()

Check if the connection is idle. It checks if the connection is not used by another thread.

Returns:

True if the connection is not used by another thread.

getClient

public org.apache.hadoop.hdfs.NameNodeProxiesClient.ProxyAndInfo<?> getClient()

Get the connection client.

Returns:

Connection client.

release

public void release()

Release this connection.

close

public void close(boolean force)

Close a connection. Only idle connections can be closed since the RPC proxy would be shut down immediately.

Parameters:

force - whether the connection should be closed anyway.

close

public void close()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object