Class ConnectionLimit

java.lang.Object

org.eclipse.jetty.util.component.AbstractLifeCycle

org.eclipse.jetty.server.ConnectionLimit

All Implemented Interfaces:

EventListener, Connection.Listener, SelectorManager.AcceptListener, LifeCycle

@ManagedObject
public class ConnectionLimit
extends AbstractLifeCycle
implements Connection.Listener, SelectorManager.AcceptListener

A Listener that limits the number of Connections.

This listener applies a limit to the number of connections, which when exceeded results in a call to AbstractConnector.setAccepting(boolean) to prevent further connections being received. It can be applied to an entire server or to a specific connector by adding it via Container.addBean(Object)

Usage:

  Server server = new Server();
  server.addBean(new ConnectionLimit(5000,server));
  ...
  server.start();

See Also:

• LowResourceMonitor
• Connection.Listener
• SelectorManager.AcceptListener

Nested Class Summary

Nested classes/interfaces inherited from class AbstractLifeCycle

AbstractLifeCycle.AbstractLifeCycleListener

Nested classes/interfaces inherited from interface Connection.Listener

Connection.Listener.Adapter

Nested classes/interfaces inherited from interface LifeCycle

LifeCycle.Listener

Field Summary

Fields

Modifier and Type	Field	Description
private final Set<SelectableChannel>	_accepting
private int	_connections
private final List<AbstractConnector>	_connectors
private long	_idleTimeout
private boolean	_limiting
private int	_maxConnections
private final Server	_server
private static final Logger	LOG

Fields inherited from class AbstractLifeCycle

FAILED, RUNNING, STARTED, STARTING, STOPPED, STOPPING

Constructor Summary

Constructors

Constructor	Description
ConnectionLimit(int maxConnections, Connector... connectors)
ConnectionLimit(int maxConnections, Server server)

Method Summary

Modifier and Type	Method	Description
protected void	check()
protected void	doStart()
protected void	doStop()
int	getConnections()
long	getIdleTimeout()
int	getMaxConnections()
protected void	limit()
void	onAccepted(SelectableChannel channel)	Called after the accepted channel has been allocated an EndPoint and associated Connection, and after the onOpen notifications have been called on both endPoint and connection.
void	onAcceptFailed(SelectableChannel channel, Throwable cause)	Called if the processing of the accepted channel fails prior to calling SelectorManager.AcceptListener.onAccepted(SelectableChannel).
void	onAccepting(SelectableChannel channel)	Called immediately after a new SelectableChannel is accepted, but before it has been submitted to the SelectorManager.
void	onClosed(Connection connection)
void	onOpened(Connection connection)
void	setIdleTimeout(long idleTimeout)
void	setMaxConnections(int max)
protected void	unlimit()

Methods inherited from class AbstractLifeCycle

addLifeCycleListener, getState, getState, getStopTimeout, isFailed, isRunning, isStarted, isStarting, isStopped, isStopping, removeLifeCycleListener, setStopTimeout, start, stop, toString

Methods inherited from class Object

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

Field Details

LOG

private static final Logger LOG

_server

private final Server _server

_connectors

private final List<AbstractConnector> _connectors

_accepting

private final Set<SelectableChannel> _accepting

_connections

private int _connections

_maxConnections

private int _maxConnections

_idleTimeout

private long _idleTimeout

_limiting

private boolean _limiting

Constructor Details

ConnectionLimit

public ConnectionLimit(@Name("maxConnections")
 int maxConnections,
 @Name("server")
 Server server)

ConnectionLimit

public ConnectionLimit(@Name("maxConnections")
 int maxConnections,
 @Name("connectors")
 Connector... connectors)

Method Details

getIdleTimeout

@ManagedAttribute("The endpoint idle timeout in ms to apply when the connection limit is reached")
public long getIdleTimeout()

Returns:

If >= 0, the endpoint idle timeout in ms to apply when the connection limit is reached

setIdleTimeout

public void setIdleTimeout(long idleTimeout)

Parameters:

idleTimeout - If >= 0 the endpoint idle timeout in ms to apply when the connection limit is reached

getMaxConnections

@ManagedAttribute("The maximum number of connections allowed")
public int getMaxConnections()

setMaxConnections

public void setMaxConnections(int max)

getConnections

@ManagedAttribute("The current number of connections ")
public int getConnections()

doStart

protected void doStart()
                throws Exception

Overrides:

doStart in class AbstractLifeCycle

Throws:

Exception

doStop

protected void doStop()
               throws Exception

Overrides:

doStop in class AbstractLifeCycle

Throws:

Exception

check

protected void check()

limit

protected void limit()

unlimit

protected void unlimit()

onAccepting

public void onAccepting(SelectableChannel channel)

Description copied from interface: SelectorManager.AcceptListener

Called immediately after a new SelectableChannel is accepted, but before it has been submitted to the SelectorManager.

Specified by:

onAccepting in interface SelectorManager.AcceptListener

Parameters:

channel - the accepted channel

onAcceptFailed

public void onAcceptFailed(SelectableChannel channel,
 Throwable cause)

Description copied from interface: SelectorManager.AcceptListener

Called if the processing of the accepted channel fails prior to calling SelectorManager.AcceptListener.onAccepted(SelectableChannel).

Specified by:

onAcceptFailed in interface SelectorManager.AcceptListener

Parameters:

channel - the accepted channel

cause - the cause of the failure

onAccepted

public void onAccepted(SelectableChannel channel)

Description copied from interface: SelectorManager.AcceptListener

Called after the accepted channel has been allocated an EndPoint and associated Connection, and after the onOpen notifications have been called on both endPoint and connection.

Specified by:

onAccepted in interface SelectorManager.AcceptListener

Parameters:

channel - the accepted channel

onOpened

public void onOpened(Connection connection)

Specified by:

onOpened in interface Connection.Listener

onClosed

public void onClosed(Connection connection)

Specified by:

onClosed in interface Connection.Listener