com.bigdata.rdf.sail.webapp.lbs

Class DefaultHARequestURIRewriter

java.lang.Object

com.bigdata.rdf.sail.webapp.lbs.DefaultHARequestURIRewriter

All Implemented Interfaces:

IHAPolicyLifeCycle, IHARequestURIRewriter

public class DefaultHARequestURIRewriter
extends Object
implements IHARequestURIRewriter

Default implementation.

Author:

Bryan Thompson

Constructor Summary

Constructors

Constructor and Description
DefaultHARequestURIRewriter()

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Destroy the policy (stop any asynchronous processing, release any resources).
void	init(javax.servlet.ServletConfig servletConfig, IIndexManager indexManager) Initialize the policy.
StringBuilder	rewriteURI(boolean isLeaderRequest, String full_prefix, String originalRequestURL, String proxyToRequestURL, javax.servlet.http.HttpServletRequest request) Rewrite the originalRequestURI into a Request-URL for the web application whose servlet context root is given by the proxyToRequestURI.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultHARequestURIRewriter

public DefaultHARequestURIRewriter()

Method Detail

init

public void init(javax.servlet.ServletConfig servletConfig,
        IIndexManager indexManager)
          throws javax.servlet.ServletException

Initialize the policy.

This implementation is a NOP.

Specified by:

init in interface IHAPolicyLifeCycle

Throws:

javax.servlet.ServletException

destroy

public void destroy()

Destroy the policy (stop any asynchronous processing, release any resources).

This implementation is a NOP.

Specified by:

destroy in interface IHAPolicyLifeCycle

rewriteURI

public StringBuilder rewriteURI(boolean isLeaderRequest,
                       String full_prefix,
                       String originalRequestURL,
                       String proxyToRequestURL,
                       javax.servlet.http.HttpServletRequest request)

Description copied from interface: IHARequestURIRewriter

Rewrite the originalRequestURI into a Request-URL for the web application whose servlet context root is given by the proxyToRequestURI.

Note: The proxyToRequestURI is include the protocol, host, port, and servlet context path for the target service. It DOES NOT include any information from the original request. The purpose of this method is to modify the originalRequestURI in order to obtain a fully qualified RequestURI for the service to which the request will be proxied. For example:

        full_prefix:                            /bigdata/LBS/leader
 -or-   full_prefix:                            /bigdata/LBS/read
 originalRequestURI: http://ha1.example.com:8090/bigdata/LBS/read/sparql
  proxyToRequestURI: http://ha3.example.com:8090/bigdata/
             return: http://ha2.example.com:8090/bigdata/LBS/read/sparql
 

Note: this method is only invoked if we will proxy to another service. Therefore, the proxyToRequestURI is never null.

Specified by:

rewriteURI in interface IHARequestURIRewriter

Parameters:

isLeaderRequest - true iff the request is directed to the leader.

full_prefix - The path prefix in the originalRequestURI that which corresponds to the HALoadBalancerServlet and which must be removed if the request is to be forwarded to a local service.

originalRequestURL - The original Request-URL from the HTTP Request-Line

proxyToRequestURL - The RequestURI for the root of the web application for the target service and never null.

request - The original request.

Returns:

The fully qualified Request-URL that will be used to proxy the http request to the service identified by the proxyToRequestURI

See Also:

ServiceScore.getRequestURI()