dcf.server
Class Distributer

dcf.server.Distributer

All Implemented Interfaces:

DistributerInt

public class Distributer

implements DistributerInt

This is the RMI server. It handles sending tasks and recieving results.
It also starts the ClassServer to serve classfiles to clients.

Author:

Tal Salmona

Constructor Summary

Distributer(MainFrame parent)

Method Summary

void	addMessage(dcf.server.String str) Posts a message to parent (dcf.server.MainFrame)
void	addPair(Task t, Solver s) Adds a Task-Solver pair to the distributer
dcf.server.HashMap	getAssignments() Gets the list of assignments
dcf.server.String	getClassServerURL()
ClassServer	getCS()
ClientsUpdater	getCU()
Task	getNextTask(WorkerInt w)
Solver	getSolverFor(Task t) Returns a solver for the task based on the Task's name.
Task	getTaskByName(dcf.server.String name) Gets a task by its name looks in unsolved tasks and then in solved tasks.
dcf.server.Vector	getTasks()
boolean	hasMoreTasks() Checks if there are more tasks in the list
void	registerClient(WorkerInt w, Task tsk) Registers a new client at the server
void	returnTask(WorkerInt w, Task t) Return a completed task to the distributer.
void	setTasksList() Updates the Worker - Task table on GUI.
void	unregisterClient(WorkerInt w) Unregisters a client at the server

Constructor Detail

Distributer

public Distributer(MainFrame parent)
            throws dcf.client.RemoteException

Method Detail

addPair

public void addPair(Task t,
                    Solver s)

Adds a Task-Solver pair to the distributer

Parameters:

t - Task to add

s - Solver for this task

getTasks

public dcf.server.Vector getTasks()

Returns:

A Vector of all Task to be proccessed.

getTaskByName

public Task getTaskByName(dcf.server.String name)

Gets a task by its name looks in unsolved tasks and then in solved tasks.

Parameters:

name - - Task's name (String name field in the task)

Returns:

The task or null if it was not found

getCS

public ClassServer getCS()

Returns:

A reference to the ClassServer

getCU

public ClientsUpdater getCU()

Returns:

A reference to the ClientsUpdater

addMessage

public void addMessage(dcf.server.String str)

Posts a message to parent (dcf.server.MainFrame)

Parameters:

str - The message to add to GUI.

registerClient

public void registerClient(WorkerInt w,
                           Task tsk)

Registers a new client at the server

Parameters:

w - The remote reference to the Worker.

tsk - The Task assigned to the Worker.

unregisterClient

public void unregisterClient(WorkerInt w)

Unregisters a client at the server

Parameters:

w - The remote reference to Worker.

getAssignments

public dcf.server.HashMap getAssignments()

Gets the list of assignments

Returns:

The mapping of tasks to Workers.

setTasksList

public void setTasksList()

Updates the Worker - Task table on GUI.

hasMoreTasks

public boolean hasMoreTasks()
                     throws dcf.client.RemoteException

Checks if there are more tasks in the list

Specified by:

hasMoreTasks in interface DistributerInt

Returns:

true if there are more tasks.

Throws:

dcf.client.RemoteException - if some eror occures here.

getNextTask

public Task getNextTask(WorkerInt w)
                 throws dcf.client.RemoteException

Specified by:

getNextTask in interface DistributerInt

Parameters:

w - The remote reference to the Worker.

Returns:

The next available task or null if there are non.

Throws:

dcf.client.RemoteException - if we get some error here.

getSolverFor

public Solver getSolverFor(Task t)
                    throws dcf.client.RemoteException

Returns a solver for the task based on the Task's name.

Specified by:

getSolverFor in interface DistributerInt

Parameters:

t - The task to get the solver for

Returns:

A solver for this task.

Throws:

dcf.client.RemoteException - If we get an error here.

returnTask

public void returnTask(WorkerInt w,
                       Task t)
                throws dcf.client.RemoteException

Return a completed task to the distributer.

Specified by:

returnTask in interface DistributerInt

Parameters:

w - The remote reference to the Worker.

t - The task to return.

Throws:

dcf.client.RemoteException - If we get some kind of error here.

getClassServerURL

public dcf.server.String getClassServerURL()
                                    throws dcf.client.RemoteException

Specified by:

getClassServerURL in interface DistributerInt

Returns:

A String representing the URL for the ClassServer so that the client can request Classfiles via HTTP.

Throws:

dcf.client.RemoteException - If we get some kind of error here.