com.oreilly.servlet
Class RemoteHttpServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          com.oreilly.servlet.RemoteHttpServlet

All Implemented Interfaces:

java.io.Serializable, java.rmi.Remote, javax.servlet.Servlet, javax.servlet.ServletConfig

public abstract class RemoteHttpServlet
extends javax.servlet.http.HttpServlet
implements java.rmi.Remote

A superclass for any HTTP servlet that wishes to act as an RMI server. RemoteHttpServlet begins listening for RMI calls in its init() method and stops listening in its destroy() method. To register itself it uses the registry on the local machine on the port determined by getRegistryPort(). It registers under the name determined by getRegistryName().

Version:

1.0, 98/09/18

Author:

Jason Hunter, Copyright © 1998

See Also:

RemoteDaemonHttpServlet, Serialized Form

Field Summary

protected java.rmi.registry.Registry

registry The registry for the servlet

Constructor Summary

RemoteHttpServlet()

Method Summary

protected void	bind() Binds the servlet to the registry.
void	destroy() Halts the servlet's RMI operations.
protected java.lang.String	getRegistryName() Returns the name under which the servlet should be bound in the registry.
protected int	getRegistryPort() Returns the port where the registry should be running.
void	init(javax.servlet.ServletConfig config) Begins the servlet's RMI operations.
protected void	unbind() Unbinds the servlet from the registry.

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

registry

protected java.rmi.registry.Registry registry

The registry for the servlet

Constructor Detail

RemoteHttpServlet

public RemoteHttpServlet()

Method Detail

init

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

Begins the servlet's RMI operations. Causes the servlet to export itself and then bind itself to the registry. Logs any errors. Subclasses that override this method must be sure to first call super.init(config).

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Parameters:

config - the servlet config

Throws:

javax.servlet.ServletException - if a servlet exception occurs

destroy

public void destroy()

Halts the servlet's RMI operations. Causes the servlet to unbind itself from the registry. Logs any errors. Subclasses that override this method must be sure to first call super.destroy().

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class javax.servlet.GenericServlet

getRegistryName

protected java.lang.String getRegistryName()

Returns the name under which the servlet should be bound in the registry. By default the name is the servlet's class name. This can be overridden with the registryName init parameter.

Returns:

the name under which the servlet should be bound in the registry

getRegistryPort

protected int getRegistryPort()

Returns the port where the registry should be running. By default the port is the default registry port (1099). This can be overridden with the registryPort init parameter.

Returns:

the port for the registry

bind

protected void bind()

Binds the servlet to the registry. Creates the registry if necessary. Logs any errors.

unbind

protected void unbind()

Unbinds the servlet from the registry. Logs any errors.