edu.ucsb.adl.middleware.rmi
Class QueryServiceImpl

java.lang.Object
  |
  +--java.rmi.server.RemoteObject
        |
        +--java.rmi.server.RemoteServer
              |
              +--java.rmi.server.UnicastRemoteObject
                    |
                    +--edu.ucsb.adl.middleware.rmi.QueryServiceImpl

All Implemented Interfaces:

QueryService, java.rmi.Remote, java.io.Serializable

public final class QueryServiceImpl

extends java.rmi.server.UnicastRemoteObject

implements QueryService

Bridge between the RMI interface to the ADL query service and the query service itself.

Version:

$Header: /export/home/gjanee/middleware/edu/ucsb/adl/middleware/rmi/RCS/QueryServiceImpl.java,v 1.1 2001/02/16 14:42:58 gjanee Exp $

$Log: QueryServiceImpl.java,v $ Revision 1.1 2001/02/16 14:42:58 gjanee Initial revision

Author:

Greg Janée
Alexandria Digital Library

See Also:

Serialized Form

Field Summary

Fields inherited from class java.rmi.server.RemoteObject

ref

Constructor Summary

QueryServiceImpl(java.lang.String configurationFile)
Creates a QueryServiceImpl.

Method Summary

protected void	finalize() Frees all resources held by the bridge.
int	performQueryService(java.lang.String queryString) Performs the ADL query service.

Methods inherited from class java.rmi.server.UnicastRemoteObject

clone, exportObject, exportObject, exportObject, unexportObject

Methods inherited from class java.rmi.server.RemoteServer

getClientHost, getLog, setLog

Methods inherited from class java.rmi.server.RemoteObject

equals, getRef, hashCode, toString, toStub

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

QueryServiceImpl

public QueryServiceImpl(java.lang.String configurationFile)
                 throws InternalErrorException,
                        java.rmi.RemoteException

Creates a QueryServiceImpl.

Parameters:

configurationFile - The filename of an ADL middleware configuration file.

Throws:

InternalErrorException - If the initialization of the service fails.

java.rmi.RemoteException - If an RMI error occurs.

Method Detail

performQueryService

public int performQueryService(java.lang.String queryString)
                        throws MiddlewareException,
                               java.rmi.RemoteException

Performs the ADL query service.

Specified by:

performQueryService in interface QueryService

Parameters:

queryString - The query, expressed in XML according to the ADL-query DTD.

Returns:

An integer that identifies both the running query and the associated result set.

Throws:

BadRequestException - If the query is invalid.

NoAuthorizationException - If the request is valid but not allowed.

UnsupportedException - If the request is valid but not supported.

java.rmi.RemoteException - If an RMI error occurs.

InternalErrorException - If the request cannot otherwise be completed.

MiddlewareException

finalize

protected void finalize()

Frees all resources held by the bridge.

Overrides:

finalize in class java.lang.Object