zeta.handler
Class SynchronizationHandler

java.lang.Object
  |
  +--zeta.handler.SynchronizationHandler

All Implemented Interfaces:

GetHandler, PostHandler

public class SynchronizationHandler

extends java.lang.Object

implements GetHandler, PostHandler

Handles a GET and a POST request to synchronize the data of this server with the data of another server. The GET request req can contain the following parameters:

• successful - timestamp of the last synchronized SQL statement of the other server.
• timestamp - smallest timestamp of the not synchronized SQL statement of the other server.

Then the synchronized data are cleaned up. Or the GET request contains no parameter, then the synchronization data of this server will be generated. The response resp contains the parameters (size of the not aligned data, timestamp, successful, data) of the new work units. The POST request must contains the following parameters which are transfered at the header name 'Param-String':

• server_id - server ID.
• statements_length - size of the not aligned data.

The response contains an 'ok' or an error. The data will be sequentially synchronized.

Field Summary

private ZetaServlet

servlet Servlet which owns this handler.

Constructor Summary

SynchronizationHandler(ZetaServlet servlet)

Method Summary

void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp) Handles a GET request to synchronize the data of this server with the data of another server.
void	doPost(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp) Handles a POST request to synchronize the data of this server with the data of another server.
private static java.lang.String	getParameter(java.util.Map parameter, java.lang.String key) Returns a value for a key from the specified map with parameters.

Methods inherited from class java.lang.Object

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

Field Detail

servlet

private ZetaServlet servlet

Servlet which owns this handler.

Constructor Detail

SynchronizationHandler

public SynchronizationHandler(ZetaServlet servlet)

Parameters:

servlet - servlet which owns this handler.

Method Detail

doGet

public void doGet(javax.servlet.http.HttpServletRequest req,
                  javax.servlet.http.HttpServletResponse resp)
           throws javax.servlet.ServletException,
                  java.io.IOException

Handles a GET request to synchronize the data of this server with the data of another server. The request req must contains the following parameters:

• successful - timestamp of the last synchronized SQL statement of the other server.
• timestamp - smallest timestamp of the not synchronized SQL statement of the other server.

Then the synchronized data are cleaned up. Or the GET request contains no parameter, then the synchronization data of this server will be generated. The response resp contains the parameters (size of data, timestamp, successful, data) of the new work units.

Specified by:

doGet in interface GetHandler

javax.servlet.ServletException

java.io.IOException

doPost

public void doPost(javax.servlet.http.HttpServletRequest req,
                   javax.servlet.http.HttpServletResponse resp)
            throws javax.servlet.ServletException,
                   java.io.IOException

Handles a POST request to synchronize the data of this server with the data of another server. The request must contains the following parameters which are transfered at the header name 'Param-String':

• server_id - server ID.
• statements_length - size of the not aligned data.

The response resp contains an 'ok' or an error. The data will be sequentially synchronized.

Specified by:

doPost in interface PostHandler

javax.servlet.ServletException

java.io.IOException

getParameter

private static java.lang.String getParameter(java.util.Map parameter,
                                             java.lang.String key)

Returns a value for a key from the specified map with parameters.

Parameters:

parameter - map with parameters

key - key

Returns:

value for a key from the specified map with parameters; empty string if no value was found.