org.atmosphere.cpr
Class Meteor

java.lang.Object
  org.atmosphere.cpr.Meteor

public class Meteor
extends Object

A Meteor is a simple class that can be used from a Servlet to suspend, broadcast and resume responses. A Meteor can be created by invoking the build() method.

Meteor.build(HttpServletRequest).suspend(-1);

A Meteor is usually created when an application needs to suspend a response. A Meteor instance can then be cached and re-used later for either broadcasting a message, or when an application needs to resume the suspended response.

Author:

Jeanfrancois Arcand

Field Summary

protected static ConcurrentHashMap<AtmosphereResource,Meteor>

cache

Method Summary

Meteor	addListener(AtmosphereResourceEventListener e) Add a AtmosphereResourceEventListener which gets invoked when responses are resuming, when the remote client closes the connection or when the a Broadcaster.broadcast(java.lang.Object) operations occurs.
void	attach(Object o) Attach an Object with this Meteor.
Object	attachement() Return an Object with this Meteor.
Meteor	broadcast(Object o) Broadcast an Object to all suspended responses.
static Meteor	build(javax.servlet.http.HttpServletRequest r) Create a Meteor using the HttpServletRequest.
static Meteor	build(javax.servlet.http.HttpServletRequest req, Broadcaster.SCOPE scope, List<BroadcastFilter> l, Serializer s) Create a Meteor using the HttpServletRequest and use a list of BroadcastFilter and Serializer for writing the result of a broadcast operation the HttpServletResponse.
static Meteor	build(javax.servlet.http.HttpServletRequest req, List<BroadcastFilter> l, Serializer s) Create a Meteor using the HttpServletRequest and use a list of BroadcastFilter and Serializer for writing the result of a broadcast operation the HttpServletResponse.
static Meteor	build(javax.servlet.http.HttpServletRequest r, Serializer s) Create a Meteor using the HttpServletRequest and use the Serializer for writing the result of a broadcast operation using the HttpServletResponse.
Meteor	delayBroadadcast(Object o, long period) Schedule a delayed broadcast, in seconds.
void	destroy() Mark this instance as destroyed.
AtmosphereResource	getAtmosphereResource() Return the underlying AtmosphereResource.
Broadcaster	getBroadcaster() Return the underlying Broadcaster.
static Meteor	lookup(javax.servlet.http.HttpServletRequest r) Retrieve an instance of Meteor based on the HttpServletRequest.
Meteor	removeListener(AtmosphereResourceEventListener e) Remove a AtmosphereResourceEventListener which gets invoked when a response is resuming, when the remote client closes the connection or when the a Broadcaster.broadcast(java.lang.Object) operations occurs.
Meteor	resume() Resume the underlying HttpServletResponse.
Meteor	resumeOnBroadcast(boolean resumeOnBroadcast) Resume the Meteor after the first broadcast operation.
Meteor	schedule(Object o, long period) Schedule a periodic broadcast, in seconds.
void	setBroadcaster(Broadcaster b) Set a Broadcaster instance.
Meteor	suspend(long l) Suspend the underlying HttpServletResponse.
Meteor	suspend(long timeout, TimeUnit timeunit) Suspend the underlying HttpServletResponse.
AtmosphereResource.TRANSPORT	transport() Return the current AtmosphereResource.TRANSPORT.

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected static final ConcurrentHashMap<AtmosphereResource,Meteor> cache

Method Detail

lookup

public static Meteor lookup(javax.servlet.http.HttpServletRequest r)

Retrieve an instance of Meteor based on the HttpServletRequest.

Parameters:

r - HttpServletRequest

Returns:

a Meteor or null if not found

build

public static final Meteor build(javax.servlet.http.HttpServletRequest r)

Create a Meteor using the HttpServletRequest.

Parameters:

r - an HttpServletRequest

Returns:

a Meteor than can be used to resume, suspend and broadcast Object

build

public static final Meteor build(javax.servlet.http.HttpServletRequest r,
                                 Serializer s)

Create a Meteor using the HttpServletRequest and use the Serializer for writing the result of a broadcast operation using the HttpServletResponse.

Parameters:

r - an HttpServletRequest

s - a Serializer used when writing broadcast events

Returns:

a Meteor than can be used to resume, suspend and broadcast Object

build

public static final Meteor build(javax.servlet.http.HttpServletRequest req,
                                 List<BroadcastFilter> l,
                                 Serializer s)

Create a Meteor using the HttpServletRequest and use a list of BroadcastFilter and Serializer for writing the result of a broadcast operation the HttpServletResponse.

Parameters:

req - an HttpServletRequest

l - a list of BroadcastFilter

s - a Serializer used when writing broadcast events

Returns:

a Meteor than can be used to resume, suspend and broadcast Object

build

public static final Meteor build(javax.servlet.http.HttpServletRequest req,
                                 Broadcaster.SCOPE scope,
                                 List<BroadcastFilter> l,
                                 Serializer s)

Create a Meteor using the HttpServletRequest and use a list of BroadcastFilter and Serializer for writing the result of a broadcast operation the HttpServletResponse.

Parameters:

req - an HttpServletRequest

scope - the Broadcaster.SCOPE}

l - a list of BroadcastFilter

s - a Serializer used when writing broadcast events

Returns:

a Meteor than can be used to resume, suspend and broadcast Object

suspend

public Meteor suspend(long l)

Suspend the underlying HttpServletResponse. Passing a value of -1 suspends the response forever.

Parameters:

l - the maximum time a response stay suspended

Returns:

Meteor

resumeOnBroadcast

public Meteor resumeOnBroadcast(boolean resumeOnBroadcast)

Resume the Meteor after the first broadcast operation. This is useful when long-polling is used.

Parameters:

resumeOnBroadcast -

Returns:

this

transport

public AtmosphereResource.TRANSPORT transport()

Return the current AtmosphereResource.TRANSPORT. The transport needs to be explicitly set by the client by adding the appropriate HeaderConfig.X_ATMOSPHERE_TRANSPORT value, which can be long-polling, streaming, websocket or JSONP.

Returns:

suspend

public Meteor suspend(long timeout,
                      TimeUnit timeunit)

Suspend the underlying HttpServletResponse. Passing a value of -1 suspends the response forever.

Parameters:

timeout - the maximum time a response stay suspended

timeunit - The time unit of the timeout value

Returns:

Meteor

resume

public Meteor resume()

Resume the underlying HttpServletResponse.

Returns:

Meteor

broadcast

public Meteor broadcast(Object o)

Broadcast an Object to all suspended responses.

Parameters:

o - an Object

Returns:

Meteor

schedule

public Meteor schedule(Object o,
                       long period)

Schedule a periodic broadcast, in seconds.

Parameters:

o - an Object

period - period in seconds

Returns:

Meteor

delayBroadadcast

public Meteor delayBroadadcast(Object o,
                               long period)

Schedule a delayed broadcast, in seconds.

Parameters:

o - an Object

period - period in seconds

Returns:

Meteor

getBroadcaster

public Broadcaster getBroadcaster()

Return the underlying Broadcaster.

Returns:

setBroadcaster

public void setBroadcaster(Broadcaster b)

Set a Broadcaster instance.

Parameters:

b -

attachement

public Object attachement()

Return an Object with this Meteor.

Returns:

the Object

attach

public void attach(Object o)

Attach an Object with this Meteor.

addListener

public Meteor addListener(AtmosphereResourceEventListener e)

Add a AtmosphereResourceEventListener which gets invoked when responses are resuming, when the remote client closes the connection or when the a Broadcaster.broadcast(java.lang.Object) operations occurs.

Parameters:

e - an instance of AtmosphereResourceEventListener

removeListener

public Meteor removeListener(AtmosphereResourceEventListener e)

Remove a AtmosphereResourceEventListener which gets invoked when a response is resuming, when the remote client closes the connection or when the a Broadcaster.broadcast(java.lang.Object) operations occurs.

Parameters:

e - an instance of AtmosphereResourceEventListener

destroy

public void destroy()

Mark this instance as destroyed. No more operations will be allowed.

getAtmosphereResource

public AtmosphereResource getAtmosphereResource()

Return the underlying AtmosphereResource.

Returns:

the underlying AtmosphereResource