Package org.eclipse.jetty.servlets

Class DoSFilter.RateTracker

java.lang.Object

org.eclipse.jetty.servlets.DoSFilter.RateTracker

All Implemented Interfaces:

Serializable, Runnable, EventListener, javax.servlet.http.HttpSessionActivationListener, javax.servlet.http.HttpSessionBindingListener

Direct Known Subclasses:

DoSFilter.FixedRateTracker

Enclosing class:

DoSFilter

static class DoSFilter.RateTracker
extends Object
implements Runnable, javax.servlet.http.HttpSessionBindingListener, javax.servlet.http.HttpSessionActivationListener, Serializable

A RateTracker is associated with a connection, and stores request rate data.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	DoSFilter.RateTracker.Overage

Field Summary

Fields

Modifier and Type	Field	Description
protected javax.servlet.ServletContext	_context
protected final String	_filterName
protected final String	_id
protected final int	_maxRequestsPerSecond
protected int	_next
protected final long[]	_timestamps
protected final DoSFilter.RateType	_type
private static final long	serialVersionUID

Constructor Summary

Constructors

Constructor	Description
RateTracker(javax.servlet.ServletContext context, String filterName, String id, DoSFilter.RateType type, int maxRequestsPerSecond)

Method Summary

Modifier and Type	Method	Description
private void	addToRateTrackers(DoSFilter filter, DoSFilter.RateTracker tracker)
String	getId()
DoSFilter.RateType	getType()
DoSFilter.OverLimit	isRateExceeded(long now)
protected void	removeFromRateTrackers(DoSFilter filter, String id)
void	run()
void	sessionDidActivate(javax.servlet.http.HttpSessionEvent se)
void	sessionWillPassivate(javax.servlet.http.HttpSessionEvent se)
void	setContext(javax.servlet.ServletContext context)
String	toString()
void	valueBound(javax.servlet.http.HttpSessionBindingEvent event)
void	valueUnbound(javax.servlet.http.HttpSessionBindingEvent event)

Methods inherited from class java.lang.Object

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

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

_filterName

protected final String _filterName

_context

protected transient javax.servlet.ServletContext _context

_id

protected final String _id

_type

protected final DoSFilter.RateType _type

_maxRequestsPerSecond

protected final int _maxRequestsPerSecond

_timestamps

protected final long[] _timestamps

_next

protected int _next

Constructor Details

RateTracker

public RateTracker(javax.servlet.ServletContext context,
 String filterName,
 String id,
 DoSFilter.RateType type,
 int maxRequestsPerSecond)

Method Details

isRateExceeded

public DoSFilter.OverLimit isRateExceeded(long now)

Parameters:

now - the time now (in nanoseconds) used to calculate elapsed time since previous requests.

Returns:

the current calculated request rate over the last second if rate exceeded, else null.

getId

public String getId()

getType

public DoSFilter.RateType getType()

valueBound

public void valueBound(javax.servlet.http.HttpSessionBindingEvent event)

Specified by:

valueBound in interface javax.servlet.http.HttpSessionBindingListener

valueUnbound

public void valueUnbound(javax.servlet.http.HttpSessionBindingEvent event)

Specified by:

valueUnbound in interface javax.servlet.http.HttpSessionBindingListener

sessionWillPassivate

public void sessionWillPassivate(javax.servlet.http.HttpSessionEvent se)

Specified by:

sessionWillPassivate in interface javax.servlet.http.HttpSessionActivationListener

sessionDidActivate

public void sessionDidActivate(javax.servlet.http.HttpSessionEvent se)

Specified by:

sessionDidActivate in interface javax.servlet.http.HttpSessionActivationListener

setContext

public void setContext(javax.servlet.ServletContext context)

removeFromRateTrackers

protected void removeFromRateTrackers(DoSFilter filter,
 String id)

addToRateTrackers

private void addToRateTrackers(DoSFilter filter,
 DoSFilter.RateTracker tracker)

run

public void run()

Specified by:

run in interface Runnable

toString

public String toString()

Overrides:

toString in class Object