Package org.cometd.oort

Class OortConfigServlet

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.cometd.oort.OortConfigServlet

All Implemented Interfaces:

Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

OortMulticastConfigServlet, OortStaticConfigServlet

public abstract class OortConfigServlet
extends javax.servlet.http.HttpServlet

This servlet serves as a base class for initializing and configuring an instance of the Oort CometD cluster manager.

The following servlet init parameters are used to configure the Oort instance:

• oort.url, the absolute public URL to the CometD servlet
• oort.secret, the pre-shared secret that Oort servers use to authenticate connections from other Oort comets
• oort.channels, a comma separated list of channels that will be passed to Oort.observeChannel(String)
• clientDebug, a boolean that enables debugging of the clients connected to other oort cluster managers

Override method newOort(BayeuxServer, String) to return a customized instance of Oort.

See Also:

SetiServlet, Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected static org.slf4j.Logger	LOG
static String	OORT_CHANNELS_PARAM
static String	OORT_ENABLE_ACK_EXTENSION_PARAM
static String	OORT_ENABLE_BINARY_EXTENSION_PARAM
static String	OORT_JSON_CONTEXT_PARAM
static String	OORT_SECRET_PARAM
static String	OORT_URL_PARAM

Constructor Summary

Constructors

Constructor	Description
OortConfigServlet()

Method Summary

Modifier and Type	Method	Description
protected abstract void	configureCloud(javax.servlet.ServletConfig config, Oort oort)	Configures the Oort cloud by establishing connections with other Oort comets.
protected void	configureOort(javax.servlet.ServletConfig config, Oort oort)	Configures the Oort instance with servlet init parameters.
void	destroy()
void	init(javax.servlet.ServletConfig config)
protected Oort	newOort(BayeuxServer bayeux, String url)	Creates and returns a new Oort instance.
protected String	provideOortURL()	Retrieves the oort.url parameter from this servlet init parameters.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

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

Field Detail

OORT_URL_PARAM

public static final String OORT_URL_PARAM

See Also:

Constant Field Values

OORT_SECRET_PARAM

public static final String OORT_SECRET_PARAM

See Also:

Constant Field Values

OORT_CHANNELS_PARAM

public static final String OORT_CHANNELS_PARAM

See Also:

Constant Field Values

OORT_ENABLE_ACK_EXTENSION_PARAM

public static final String OORT_ENABLE_ACK_EXTENSION_PARAM

See Also:

Constant Field Values

OORT_ENABLE_BINARY_EXTENSION_PARAM

public static final String OORT_ENABLE_BINARY_EXTENSION_PARAM

See Also:

Constant Field Values

OORT_JSON_CONTEXT_PARAM

public static final String OORT_JSON_CONTEXT_PARAM

See Also:

Constant Field Values

LOG

protected static final org.slf4j.Logger LOG

Constructor Detail

OortConfigServlet

public OortConfigServlet()

Method Detail

init

public void init(javax.servlet.ServletConfig config)
          throws javax.servlet.ServletException

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

provideOortURL

protected String provideOortURL()

Retrieves the oort.url parameter from this servlet init parameters.

Subclasses can override this method to compute the oort.url parameter dynamically, for example by retrieving the IP address of the host.

Returns:

the oort.url parameter

newOort

protected Oort newOort(BayeuxServer bayeux,
                       String url)

Creates and returns a new Oort instance.

Parameters:

bayeux - the BayeuxServer instance to which the Oort instance should be associated to

url - the oort.url of the Oort instance

Returns:

a new Oort instance

configureOort

protected void configureOort(javax.servlet.ServletConfig config,
                             Oort oort)
                      throws Exception

Configures the Oort instance with servlet init parameters.

Parameters:

config - the Servlet configuration

oort - the Oort instance to configure

Throws:

Exception - if the Oort instance cannot be configured

configureCloud

protected abstract void configureCloud(javax.servlet.ServletConfig config,
                                       Oort oort)
                                throws Exception

Configures the Oort cloud by establishing connections with other Oort comets.

Subclasses implement their own strategy to discover and link with other comets.

Parameters:

config - the servlet configuration to read parameters from

oort - the Oort instance associated with this configuration servlet

Throws:

Exception - if the cloud configuration fails

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class javax.servlet.GenericServlet