Package org.atmosphere.interceptor

Class HeartbeatInterceptor

java.lang.Object

org.atmosphere.cpr.AtmosphereInterceptorAdapter

org.atmosphere.interceptor.HeartbeatInterceptor

All Implemented Interfaces:

AtmosphereInterceptor, AtmosphereConfigAware, InvokationOrder

public class HeartbeatInterceptor
extends AtmosphereInterceptorAdapter

An interceptor that send whitespace every in 60 seconds by default. Another value could be specified with the ApplicationConfig.HEARTBEAT_INTERVAL_IN_SECONDS in the atmosphere config. The heartbeat will be scheduled as soon as the request is suspended.

Moreover, any client can ask for a particular value with the HeaderConfig.X_HEARTBEAT_SERVER header set in request. This value will be taken in consideration if it is greater than the configured value. Client can also specify the value "0" to disable heartbeat.

Finally the server notifies thanks to the JavaScriptProtocol the desired heartbeat interval that the client should applies. This interceptor just manage the configured value and the protocol sends the value to the client.

Author:

Jeanfrancois Arcand

Nested Class Summary

Nested classes/interfaces inherited from interface org.atmosphere.interceptor.InvokationOrder

InvokationOrder.PRIORITY

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	HEARTBEAT_FUTURE
static java.lang.String	INTERCEPTOR_ADDED

Fields inherited from interface org.atmosphere.interceptor.InvokationOrder

AFTER_DEFAULT, BEFORE_DEFAULT, FIRST_BEFORE_DEFAULT

Constructor Summary

Constructors

Constructor	Description
HeartbeatInterceptor()

Method Summary

Modifier and Type	Method	Description
int	clientHeartbeatFrequencyInSeconds()	Gets the desired heartbeat frequency from client.
HeartbeatInterceptor	clientHeartbeatFrequencyInSeconds(int clientHeartbeatFrequencyInSeconds)
HeartbeatInterceptor	clock(int interval, AtmosphereResource r, AtmosphereRequest request, AtmosphereResponse response)	Configures the heartbeat sent by the server in an interval in seconds specified in parameter for the given resource.
void	configure(AtmosphereConfig config)	Configure an AtmosphereFramework object.
void	destroy()	Clean the AtmosphereInterceptor when removed or when the Atmosphere is undeployed.
protected int	extractHeartbeatInterval(AtmosphereResourceImpl resource)	Extracts the heartbeat interval as explained in class description.
byte[]	getPaddingBytes()	Gets the bytes to use when sending an heartbeat for both client and server.
int	heartbeatFrequencyInSeconds()
HeartbeatInterceptor	heartbeatFrequencyInSeconds(int heartbeatFrequencyInSeconds)
Action	inspect(AtmosphereResource r)	Invoked before an AtmosphereResource gets dispatched to AtmosphereHandler.
HeartbeatInterceptor	paddingText(byte[] paddingBytes)
boolean	resumeOnHeartbeat()
HeartbeatInterceptor	resumeOnHeartbeat(boolean resumeOnHeartbeat)
java.lang.String	toString()

Methods inherited from class org.atmosphere.cpr.AtmosphereInterceptorAdapter

postInspect, priority

Methods inherited from class java.lang.Object

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

Field Detail

INTERCEPTOR_ADDED

public static final java.lang.String INTERCEPTOR_ADDED

HEARTBEAT_FUTURE

public static final java.lang.String HEARTBEAT_FUTURE

See Also:

Constant Field Values

Constructor Detail

HeartbeatInterceptor

public HeartbeatInterceptor()

Method Detail

paddingText

public HeartbeatInterceptor paddingText(byte[] paddingBytes)

getPaddingBytes

public byte[] getPaddingBytes()

Gets the bytes to use when sending an heartbeat for both client and server.

Returns:

the heartbeat value

heartbeatFrequencyInSeconds

public HeartbeatInterceptor heartbeatFrequencyInSeconds(int heartbeatFrequencyInSeconds)

heartbeatFrequencyInSeconds

public int heartbeatFrequencyInSeconds()

clientHeartbeatFrequencyInSeconds

public int clientHeartbeatFrequencyInSeconds()

Gets the desired heartbeat frequency from client.

Returns:

the frequency in seconds

clientHeartbeatFrequencyInSeconds

public HeartbeatInterceptor clientHeartbeatFrequencyInSeconds(int clientHeartbeatFrequencyInSeconds)

resumeOnHeartbeat

public boolean resumeOnHeartbeat()

resumeOnHeartbeat

public HeartbeatInterceptor resumeOnHeartbeat(boolean resumeOnHeartbeat)

configure

public void configure(AtmosphereConfig config)

Description copied from interface: AtmosphereConfigAware

Configure an AtmosphereFramework object.

Specified by:

configure in interface AtmosphereConfigAware

Overrides:

configure in class AtmosphereInterceptorAdapter

Parameters:

config - AtmosphereConfig

inspect

public Action inspect(AtmosphereResource r)

Description copied from interface: AtmosphereInterceptor

Invoked before an AtmosphereResource gets dispatched to AtmosphereHandler.

Specified by:

inspect in interface AtmosphereInterceptor

Overrides:

inspect in class AtmosphereInterceptorAdapter

Parameters:

r - a AtmosphereResource

Returns:

Action.CONTINUE or Action.SUSPEND to dispatch the AtmosphereResource to other AtmosphereInterceptor or AtmosphereHandler. Return Action.TYPE.CANCELLED to stop the processing.

extractHeartbeatInterval

protected int extractHeartbeatInterval(AtmosphereResourceImpl resource)

Extracts the heartbeat interval as explained in class description. This method could be overridden to change the the configuration points.

Parameters:

resource - the resource

Returns:

the interval, 0 won't trigger the heartbeat

clock

public HeartbeatInterceptor clock(int interval,
                                  AtmosphereResource r,
                                  AtmosphereRequest request,
                                  AtmosphereResponse response)

Configures the heartbeat sent by the server in an interval in seconds specified in parameter for the given resource.

Parameters:

interval - the interval in seconds

r - the resource

request - the request response

response - the resource response

toString

public java.lang.String toString()

Overrides:

toString in class AtmosphereInterceptorAdapter

destroy

public void destroy()

Description copied from interface: AtmosphereInterceptor

Clean the AtmosphereInterceptor when removed or when the Atmosphere is undeployed.

Specified by:

destroy in interface AtmosphereInterceptor

Overrides:

destroy in class AtmosphereInterceptorAdapter